CN115428488A - Detection method based on backscattering, detection equipment and wearable equipment - Google Patents
Detection method based on backscattering, detection equipment and wearable equipment Download PDFInfo
- Publication number
- CN115428488A CN115428488A CN202080100083.5A CN202080100083A CN115428488A CN 115428488 A CN115428488 A CN 115428488A CN 202080100083 A CN202080100083 A CN 202080100083A CN 115428488 A CN115428488 A CN 115428488A
- Authority
- CN
- China
- Prior art keywords
- frequency
- detection
- information
- signal
- antenna
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 160
- 238000000034 method Methods 0.000 claims abstract description 74
- 230000008569 process Effects 0.000 claims abstract description 27
- 230000005540 biological transmission Effects 0.000 claims abstract description 21
- 238000001914 filtration Methods 0.000 claims description 21
- 238000004590 computer program Methods 0.000 claims description 17
- 230000001121 heart beat frequency Effects 0.000 claims description 16
- 238000012360 testing method Methods 0.000 claims description 14
- 230000036391 respiratory frequency Effects 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 10
- 230000035565 breathing frequency Effects 0.000 claims description 3
- 238000012806 monitoring device Methods 0.000 description 29
- 238000012544 monitoring process Methods 0.000 description 12
- 230000006870 function Effects 0.000 description 10
- 230000029058 respiratory gaseous exchange Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 230000006399 behavior Effects 0.000 description 2
- 210000000554 iris Anatomy 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 230000036772 blood pressure Effects 0.000 description 1
- 230000037237 body shape Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 210000000887 face Anatomy 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
- 230000036387 respiratory rate Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The application relates to a detection method based on backscattering, detection equipment and wearable equipment, wherein the method is applied to the detection equipment, the detection equipment comprises an antenna, a transmitter, a receiver and a processor, and the method comprises the following steps: the method comprises the steps that a detection device receives a signal transmitted by a first device through a receiver, wherein the signal received by the detection device has a first frequency; wherein the signal transmitted by the first device is a signal transmitted by a backscatter transmitter through an antenna to the detection device, and the first device switches the antenna matching state at a second frequency during the transmission of the signal; the detection device transmits a carrier wave CW through an antenna by a transmitter in the process of receiving the signal transmitted by the first device; the processor of the detection device determines vital sign detection information based on the first frequency, the second frequency and the frequency of the carrier CW.
Description
The present application relates to the field of communications, and in particular, to a backscatter-based detection method, a detection device, and a wearable device.
In electronic products, vital sign recognition functions are common, for example, a specific user is recognized by using biological features (fingerprints, irises, voiceprints, faces, and the like) to realize an unlocking function of the electronic products; some novel smart machines can also monitor vital signs of patients, such as heartbeat, blood pressure, blood oxygen content and other indexes, and realize health tracking and prompting.
However, most of the electronic products at present mainly use special sensors to collect and identify vital sign information, and adopt communication standards and algorithms to cooperate to realize, so that not only are the hardware and software costs high as a whole, but also the following disadvantages may exist: most of common identity recognition applications focus on 'first-time' opening functions, such as unlocking, decryption payment and other functions realized by face recognition, fingerprint recognition, iris recognition or voice recognition, and aim to realize 'one-time recognition'. Since continuous identification cannot be performed, biometric identification needs to be performed again if the user needs to be confirmed again, which may destroy the fluency of the work being performed by the user. At present, face recognition and a computer vision algorithm can be adopted to carry out identity recognition for a certain time, but the face recognition technology utilizing a camera can expose the privacy of a user, the use enthusiasm is seriously influenced, the computer vision technology is influenced by factors such as environment, light, shielding objects and the like, the algorithm is complex and time-consuming, the reliability and timeliness of a recognition result are to be improved, and the privacy and the technical application are limited.
Disclosure of Invention
In view of this, embodiments of the present application provide a backscatter-based detection method, a detection device, and a wearable device.
The embodiment of the application provides a detection method based on backscattering, which is applied to detection equipment, wherein the detection equipment comprises an antenna, a transmitter, a receiver and a processor, and the method comprises the following steps: the method comprises the steps that a detection device receives a signal transmitted by a first device through a receiver, wherein the signal received by the detection device has a first frequency; wherein the signal transmitted by the first device is a signal transmitted by a backscatter transmitter through an antenna to the detection device, the first device switching antenna matching state at a second frequency during transmission of the signal; the detection device transmits a carrier wave CW through an antenna by a transmitter in the process of receiving the signal transmitted by the first device; the processor of the detection device determines vital sign detection information based on the first frequency, the second frequency and the frequency of the carrier CW.
The embodiment of the application provides a detection method based on backscattering, which is applied to wearable equipment, wherein the wearable equipment comprises an antenna and a backscattering transmitter, and the method comprises the following steps: a wearable device transmits a signal to the detection device through an antenna using a backscatter transmitter, and the wearable device switches an antenna matching state at a second frequency during transmission of the signal.
An embodiment of the present application further provides a detection device, including:
a receiver for receiving a signal transmitted by a first device, the signal received by the detection device having a first frequency; wherein the signal transmitted by the first device is a signal transmitted by a backscatter transmitter through an antenna to the detection device, and the first device switches the antenna matching state at a second frequency during the transmission of the signal;
a transmitter for transmitting a carrier wave CW through an antenna in receiving a transmission signal of the first device;
a detection information determining module, configured to determine vital sign detection information based on the first frequency, the second frequency and the frequency of the carrier CW.
An embodiment of the present application further provides a wearable device, including:
a backscatter transmitter to transmit a signal through the antenna to the detection device, and the wearable device to switch the antenna matching state at a second frequency during the transmission of the signal.
An embodiment of the present application further provides a detection device, including: an antenna, a transmitter, a receiver, a processor and a memory for storing a computer program, the processor invoking and running the computer program stored in the memory performing the method as described above.
The embodiment of the present application further provides a wearable device, including: an antenna, a receiver, a backscatter transmitter, a processor and a memory, the memory for storing a computer program, the processor calling and running the computer program stored in the memory performing the method as described above.
An embodiment of the present application further provides a chip, including: a processor for calling and running the computer program from the memory so that the device on which the chip is installed performs the method as described above.
Embodiments of the present application also provide a computer-readable storage medium for storing a computer program, where the computer program causes a computer to execute the method described above.
Embodiments of the present application further provide a computer program product, which includes computer program instructions, where the computer program instructions cause a computer to execute the method described above.
Embodiments of the present application also provide a computer program, which enables a computer to execute the method described above.
In the embodiment of the application, the wearable device is carried by a living body such as a human body, and can transmit vital sign information of the human body within a certain time period to the detection device, so that the vital signs of the living body such as heartbeat, respiration and the like can be continuously monitored, and personal privacy cannot be leaked in the monitoring process; wearable equipment transmits vital sign information to check out test set through the mode of backscatter, does not need special sensor information acquisition, and the hardware is with low costs.
Fig. 1 schematically shows a schematic representation of a heart beat spectrum measured by a medical device.
Fig. 2 is a flowchart of a detection method of a detection apparatus according to an embodiment of the present application.
Fig. 3 is a flow chart of a detection method of a wearable device according to an embodiment of the present application.
Fig. 4 is a schematic structural block diagram of a wearable device according to an embodiment of the present application.
Fig. 5 is a schematic structural block diagram of a chip of a wearable device according to an embodiment of the present application.
Fig. 6 is a schematic structural block diagram of a detection apparatus according to an embodiment of the present application.
Fig. 7 is a schematic diagram of an application scenario according to an embodiment of the present application.
Fig. 8 is a schematic structural block diagram of another detection apparatus according to an embodiment of the present application.
Fig. 9 is a schematic structural block diagram of another wearable device according to an embodiment of the present application.
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
The technical solutions of the embodiments of the present application will be described below with reference to the drawings of the embodiments of the present application. In which various details of embodiments of the present application are described to assist understanding, but merely as exemplary embodiments, it will be recognized by those skilled in the art that changes and modifications may be made to the specific embodiments described without departing from the principles and spirit of the embodiments of the present application, and therefore, all such changes and modifications are intended to be included within the scope of the embodiments of the present application. Moreover, for the purposes of clarity and conciseness, descriptions of certain well-known functions and structures are omitted from the description of the specific embodiments and do not affect the implementation of the embodiments of the present application. The various embodiments of the present application described herein, without mutual exclusivity, may be implemented in any combination to achieve the basic and/or further additive beneficial results.
The term "and/or" is used herein to describe an association relationship of multiple association objects, for example, three association relationships that may exist between two association objects are represented, for example, a and/or B may represent: the three cases of A alone, A and B simultaneously and B alone. The character "/" herein generally indicates a relationship in which the former and latter associated objects are "or".
It should be understood that, in the embodiments of the present application, the sequence numbers of the various processes involved do not mean the execution sequence, and the execution sequence of each process is determined by the function and the inherent logic, so the size of the sequence number does not set any particular limit to the implementation process of the embodiments of the present application.
In the description of the embodiments of the present application, the term "correspond" may indicate that there is a direct correspondence or an indirect correspondence between the two, may also indicate that there is an association between the two, and may also indicate and be indicated, configure and configured, and so on.
Before describing embodiments of the present application, a brief introduction will first be made to the backscattering technique. The backscattering technology is based on Radar technology as theory and application, and the backscattering technology utilizes the concept of Radar Cross Section (RCS) in the Radar principle. Briefly, when an electromagnetic wave encounters a spatial target, a portion of its energy is absorbed by the target and another portion is scattered in various directions with different intensities. In the scattered energy, a portion is reflected back to the transmitting antenna, received by the transmitting antenna (and thus the transmitting antenna is also the receiving antenna), and the received signal is amplified and processed to obtain information about the target object. In a backscatter system, the frequency of the electromagnetic wave reflected by the target is related to the radar cross section RCS of the target, the RCS of the target being related to the size, shape, material, distance from the radar, etc. of the target.
Based on the above theoretical basis, the embodiment of the application provides a method for detecting vital sign information based on backscattering, the method has the main idea that the change of RCS is realized by actively changing the impedance matching of an antenna of a device with a backscattering function, and the frequency change of a reflected signal depends on the change of RCS, so that the transmitted signal of a carrier wave can be encoded by operating the frequency change of RCS, and a target signal can be identified from a plurality of reflected signals; in addition, in practice, since vital sign information of a human body is periodic motion such as breathing and heart beat, fig. 1 shows a heart beat frequency spectrum measured by medical equipment, and heart beat is periodic motion, which may cause a small change in the overall body shape of a human, if the human body carries equipment with a backscatter function, the periodic change of the vital sign of the human body will change the distance between the equipment, and the larger the distance is, the weaker the backscatter signal is, and the vital sign information of the target human body can be obtained by collecting and analyzing the strength of the target reflection signal, thereby achieving the purpose of detecting the vital sign of the human body.
Based on the above idea, an embodiment of the present application provides a backscatter-based detection method, which is applied to a detection device, where the detection device includes an antenna, a transmitter, and a receiver, and with reference to fig. 2, the method includes:
s101, a detection device receives a signal transmitted by a first device through a receiver, wherein the signal received by the detection device has a first frequency; wherein the signal transmitted by the first device is a signal transmitted by a backscatter transmitter through an antenna to the detection device, and the first device switches the antenna matching state at a second frequency during the transmission of the signal;
s102, the detection equipment utilizes a transmitter to transmit carrier wave CW through an antenna in the process of receiving the signal transmitted by the first equipment;
s103, the processor of the detection device determines vital sign detection information based on the first frequency, the second frequency and the frequency of the carrier CW.
The equipment to be detected and first equipment in this application embodiment all can design into wearable equipment, for example can make the card in the clothing, the bracelet that can wear, wrist-watch or embellishment etc, owing to do not need special sensor information collection, consequently can reduce the hardware cost, wearable equipment is carried by the life entity for example the human body, based on the backscatter technique, this wearable equipment can transmit human vital sign information in the certain period of time for check out test set, thereby can realize the continuous monitoring to important vital sign such as heartbeat, breathing of life entity, individual privacy is difficult to reveal in the monitoring process.
In an embodiment of the present application, optionally, before the detecting device receives the signal transmitted by the first device through the receiver, the method further includes: the detection device sends request information to at least one tested device, wherein the request information comprises the identity identification information of the first device, and the request information is used for requesting the first device to send the vital sign detection information.
In an embodiment of the present application, optionally, after the detecting device receives the first device transmission signal, the detecting device sends a reset signal to the at least one device under test, where the reset signal is used to instruct the at least one device under test to return to a default state, and the at least one device under test waits for receiving next request information in the default state.
For next request information, the same processing mode can be adopted to acquire the detection information of the corresponding wearable device, so that the vital sign information of different users can be acquired, and accurate identification of each user in a multi-user scene or environment can be realized.
In an embodiment of the present application, optionally, first information is included in a signal received by the detection device, and a frequency of the first information is different from the second frequency; the detection device may confirm the identity of the first device based on the first information.
Through the mode, the identity can be confirmed for multiple times through the first information between the detection device and the wearable device, for example, the first information comprises the ID of the wearable device, the detection device can receive the ID of the wearable device which is currently communicated when receiving the reflected signal, the detection device can confirm the identity of the wearable device according to the ID, multiple times of identity confirmation can be realized by sending the first information for multiple times, identity verification can be performed on the premise that the current work of a user is not interrupted, and the accuracy of the information source is ensured.
In an embodiment of the present application, optionally, the determining, by the detecting device, vital sign detection information based on the first frequency, the second frequency and the frequency of the carrier CW includes: and the detection equipment processes the first frequency, the second frequency and the carrier wave CW frequency in a physical filtering and/or digital filtering mode to determine the vital sign detection information.
In an embodiment of the present application, optionally, the vital sign detection information includes a heart beat frequency and a breathing frequency; the detection device determines vital sign detection information based on the first frequency, the second frequency and the frequency of the carrier CW, including: the detection device determines the heart beat frequency f according to the following formula heart And a respiratory frequency of f resp ：
f received ＝f c +f bs +(f heart +f resp )
Wherein f is received Is said first frequency, f c Is the center frequency, f, of the CW wave bs Is the second frequency.
According to an embodiment of the present application, f c And f bs In known amounts, they can be screened from f by frequency received Filtering, and processing to obtain heartbeat frequency f heart And the respiratory frequency f resp And completing measurement and result analysis of vital signs.
In an embodiment of the present application, optionally, the detection device determines, based on the vital sign detection information, user identity information corresponding to the first device.
Correspondingly, the embodiment of the present application further provides a backscatter-based detection method, which is applied to a wearable device, where the wearable device corresponds to the device under test in the embodiment of fig. 2, and the wearable device includes an antenna and a backscatter transmitter, and with reference to fig. 3, the method includes:
s201, the wearable device transmits a signal to the detection device through an antenna by using a backscatter transmitter, and switches an antenna matching state at a second frequency in the process of transmitting the signal.
Utilize embodiment hardware of this application with low costs, do not need special sensor to gather the signal specially, wearable equipment is carried by for example the human body, based on the backscatter technique, can realize the continuous monitoring to vital sign such as heartbeat, breathing, and individual privacy is difficult to reveal in the monitoring process.
In an embodiment of the application, optionally, before the wearable device transmits a signal to the detection device through an antenna by using a backscatter transmitter, the method further includes: the wearable device receives request information sent by a detection device, wherein the request information comprises identity identification information of a first device, and the request information is used for requesting the first device to send vital sign detection information; and if the wearable equipment identity is consistent with the identity of the first equipment, the wearable equipment determines to transmit a signal to the detection equipment.
In an embodiment of the application, optionally, if the identity of the wearable device is inconsistent with the identity of the first device, the wearable device adjusts an antenna state, and an adjusted radar scattering cross section RCS is smaller than an RCS before adjustment. Therefore, the interference of the invalid signal to the detection device can be reduced as much as possible, and the signal-to-noise ratio of the reflected signal of the first device, namely the target device, is improved.
In the embodiment of the present application, optionally, the wearable device receives a reset signal sent by the detection device, and in response to the reset signal, the wearable device returns to a default state in which the wearable device waits for receiving the next request information.
By utilizing the embodiment of the application, the detection information can be requested to a plurality of wearable devices, and when the wearable devices are used in a multi-person scene, the vital signs of each person in the scene can be effectively identified.
In an embodiment of the present application, optionally, the wearable device sends first information in a process of transmitting a signal, where a frequency of the first information is different from the second frequency, and the first information is used for the detection device to confirm an identity of the wearable device.
In an embodiment of the present application, optionally, the detection device and the wearable device are both implemented by hardware, and the hardware structures of the detection device and the wearable device in the embodiment of the present application are described in detail below.
In the embodiment of the present application, regarding "wearable device", a physical structure which is convenient for a user to carry or wear may be adopted from the structure, and should be small and light, such as a card design, a pen design, etc., and need not be a smart device, but a common hardware carrier may be used, and fig. 4 schematically shows the structure of a wearable device of the embodiment of the present application, which mainly includes two parts, namely an antenna and a chip.
Optionally, in some implementations of the present application, the antenna may be a dipole antenna (dipole antenna), a planar antenna (patch antenna), a loop antenna (loop antenna), or an antenna array (antenna array) composed of multiple monopoles may also be used in some applications. Optionally, the wearable device may use a radio frequency in the range of 200MHz-100 GHz.
Alternatively, in some implementations of the present application, the antenna may be fabricated from a separate metal (e.g., copper); the antenna may be Printed, etched or otherwise attached to a dielectric object, such as ceramic, resin or Printed Circuit Board (PCB).
Optionally, in some implementations of the present application, the antenna may be made of a conductive textile material (conductive textile material), and the wearable device made of such a material may be conveniently sewn to a knitted fabric such as clothes, or may be used independently.
Fig. 5 schematically shows a structure of a chip in a wearable device according to an embodiment of the present application, where the chip may include: the system comprises a receiver, a radio frequency energy collecting device, a backscatter transmitter, an energy management module, a microprocessor for controlling a logic circuit and a memory.
Optionally, in some implementations of the present application, the chip may be fabricated using a Complementary Metal Oxide Semiconductor (CMOS) process; the chip can be manufactured by a System In Package (SiP) process; the chip may be made in the form of a PCB. Optionally, in some implementations of the present application, the memory is a non-standalone module, the memory being integrated within the microprocessor.
The detection device, which may also be referred to as a monitoring device according to the embodiments of the present application, may be optionally designed as a structure as shown in fig. 6, and may be placed at a fixed position in an application environment during operation, and the monitoring device may include: the detection equipment can acquire and process the information of the wearable equipment, and can feed the information back to the server for informing the user.
It should be understood that the hardware structures shown in fig. 4, fig. 5, and fig. 6 are only an exemplary structure, and the detecting device and the wearable device may be designed in various suitable hardware structures under the premise that the functions of the embodiments of the present application can be implemented, which is not limited by the embodiments of the present application.
The following describes a specific implementation process of the embodiment of the present application by using a specific example.
Fig. 7 shows a schematic diagram of an application scenario of an embodiment of the present application, in which a monitoring device 100 may perform backscatter-based wireless communication with a plurality of wearable devices within a space range, illustratively, a wearable device 1, a wearable device 2, a wearable device 8230, and a wearable device n carried by a living body 1, a living body 2, a wearable device 8230, and a living body n, respectively, shown in fig. 7. The ID information of the wearable devices 1 to n may be pre-stored in the monitoring device 100, where the wearable devices 1 to n are respectively carried by a plurality of living bodies (e.g., users, patients), and are, for example, sewn in clothes, installed in worn bracelets or ornaments, and the like, and fig. 7 shows that the wearable devices are sewn in clothes.
In this embodiment, the monitoring device 100 may obtain and process information of each wearable device, so as to achieve the purpose of identifying the vital sign detection information of the target object. The following describes an interaction process between the monitoring device 100 and the wearable device according to the embodiment of the present application.
(1) Firstly, the monitoring device 100 determines a target object, for example, it is determined according to an instruction that a user vital sign of the wearable device 1 needs to be acquired, the monitoring device 100 locks this time to communicate with the wearable device 1, the monitoring device 100 may obtain an ID of the wearable device 1 according to the instruction, or extract the ID of the wearable device 1 from pre-stored ID information of the wearable device, and then the monitoring device 100 sends out detection request information, specifically, the monitoring device 100 transmits a signal outwards through an antenna, where the signal carries the ID information of the wearable device 1 and is used to request the wearable device 1 to feed back user vital sign detection information to the monitoring device 100.
Optionally, the ID information of the wearable device may include an independent identification (UID) of the wearable device.
(2) A plurality of wearable devices within the range of the receivable signals may each receive the detection request information sent by the monitoring device 100, and the detection request information includes the UID of the wearable device requested to provide the information. And each wearable device receiving the detection request information checks whether the UID carried in the detection request information is matched with the UID of the wearable device, if the matching is successful, the wearable device provides vital sign information for the monitoring device 100, and the next step is carried out.
Optionally, if the matching fails, the wearable device may not perform other operations, and may also adopt a processing manner of reducing the RCS, which will be described in detail below.
(3) Taking the wearable device 1 as an example, the UID matching is successful, and as a feedback, the wearable device 1 starts to transmit a signal at a fixed frequency (denoted as f) bs ) The antenna matching state is switched, and the maintaining time of the antenna matching state is recorded as t detection_tag . During the transmission of the signal by the wearable device 1, the monitoring device 100 transmits a carrier wave CW. Here, since the wearable device 1 is carried on the user, the signal emitted by the wearable device carries vital sign information of the user, such as the heartbeat frequency f heart A respiratory frequency of f resp 。
Wherein, optionally, t detection_tag May be preset, or may carry the detection sent by the monitoring device 100 in the aforementioned step (1)In the request information. Wherein, optionally, the carrier wave CW may be a continuous wave, such as a sine wave.
(4) The monitoring device 100 monitors the feedback information of the wearable device 1, and the monitoring duration is t detection_reader Time of interception t detection_reader Should be greater than or equal to t detection_tag . After listening is complete (e.g., t) detection_reader After arrival), the process of the wearable device 1 detecting the vital sign information of the user is finished, and the monitoring device 100 can transmit a signal S reset And the notification module is used for notifying each wearable device 1-n to recover the normal state and waiting for the monitoring device 100 to send the next detection request information.
(5) The monitoring device 100 is paired at t detection_reader And filtering the information collected by the time period to obtain the heartbeat and respiration related information. The monitoring device 100 may associate this information with the UID of the wearable device 1, send to a server, which may feed back to the user.
By repeating the processing procedures (1) to (5), the monitoring device 100 may obtain the detection information of other wearable devices by using the same method, and obtain the vital sign information of the corresponding user.
Alternatively, it is assumed that the center frequency f of the CW wave emitted by the monitoring apparatus 100 is c Heart beat frequency of f heart Respiratory rate of f resp In (3), the frequency at which the wearable device 1 switches the antenna matching state is f bs Frequency f received by the monitoring device 100 received Can be calculated according to the formula given above as follows:
f received ＝f c +f bs +(f heart +f resp )
wherein f is c And f bs To be known, it is screened from f by means of frequency received Filtering to obtain the heart beat frequency f heart And the respiratory frequency f resp 。
Alternatively, in (2),if the UID matching fails, taking the wearable device 2 as an example, the following processing may also be performed: the wearable device 2 transforms its antenna state to a state that minimizes the antenna RCS, thereby reducing the interference of the wearable device 2 with the monitoring device 100. Similarly, other wearable devices that fail to match can adjust their antenna states to the minimum RCS state, thereby reducing interference to the monitoring device 100 as much as possible and improving the signal-to-noise ratio of the reflected signal of the target wearable device, i.e., wearable device 1. S upon receipt of the monitoring device 100 reset After the signal, the wearable device 2 may reset, i.e., return to normal, waiting for the next detection request.
In (3), the wearable device 1 is at t detection_tag Using a fixed frequency f within a time interval bs Switch the antenna matching state, optionally, in other embodiments of the present application, the wearable device 1 may also switch the antenna matching state at t detection_tag Increasing information S in a transmitted signal over a period of time connected That is, the wearable device 1 does not use the fixed frequency f bs Transmitting signals, but using varying frequency f signal Transmitting a signal, e.g. by changing the frequency of impedance matching of the wearable device 1 to increase S connected Wherein when S connected After the information transmission is finished, the frequency is changed back to the fixed frequency f bs Transmits a signal, the monitoring device 100 passes S connected It can be confirmed that the reflected signal is from the wearable device 1. Alternatively, may be at t detection_tag Increasing S a plurality of times within a time period connected Each time S connected All of the information is converted to a fixed frequency f after the information is transmitted bs And transmitting the signal. The purpose of this processing is that the monitoring device 100 can confirm that the monitored signal comes from the target wearable device 1 many times in the monitoring process, and the reliability of the detection result is improved.
Alternatively, in (5), the monitoring apparatus 100 may acquire the heartbeat information and the respiration information by using both physical filtering and digital filtering.
(1) Physical filtering: the monitoring equipment should have elements required for physical filtering, e.g. by means of acoustic surfacesA filter of the wave (SAW) method to obtain the heartbeat frequency f heart And the respiratory frequency f resp 。
(2) Digital filtering: processing the signal in the central processor of the monitoring equipment by a filtering algorithm to restore the heartbeat frequency f heart And the respiratory frequency f resp 。
(3) The way digital filtering is combined with physical filtering: the CW frequency f can be filtered out by a physical filtering mode c Then f is filtered out by digital filtering bs Finally, the heart beat frequency f is restored heart And the respiratory frequency f resp 。
Optionally, the user identification may be performed by analyzing the vital sign information in the application. Specifically, the heart beat in the actual center accords with a certain waveform, has individual differences similar to fingerprints, and can acquire a large amount of vital sign data to establish a data file of the heart beat and the breathing behavior of the user. The monitoring device can determine the user identity corresponding to the vital sign information again by comparing the files. Therefore, the user identity can be determined through the UID in the wearable device, the user identity can be confirmed again through comparing the heartbeat and the respiratory behavior archive, and the reliability of the identification result is improved.
The specific arrangement and implementation of the embodiments of the present application are described above from different perspectives by way of a plurality of embodiments. In correspondence with the processing method of at least one embodiment described above, the present embodiment further provides a detection apparatus 200, with reference to fig. 8, including:
a receiver 210 for receiving a signal transmitted by a first device, the signal received by the detection device having a first frequency; wherein the signal transmitted by the first device is a signal transmitted by a backscatter transmitter through an antenna to the detection device, and the first device switches the antenna matching state at a second frequency during the transmission of the signal;
a transmitter 220 for transmitting a carrier CW through an antenna 230 in the process of receiving the first device transmission signal;
a detection information determining module 240 configured to determine vital sign detection information based on the first frequency, the second frequency and the frequency of the carrier CW.
Corresponding to the processing method of at least one of the above embodiments, the present embodiment further provides a wearable device 300, referring to fig. 9, including:
a backscatter transmitter 310 for transmitting a signal to the detection device via an antenna 320 if the wearable device identity is consistent with the identity of the first device, and switching an antenna matching state at a second frequency value during transmission of the signal.
The wearable device is carried by a living body such as a human body, and can transmit vital sign information of the human body in an appointed time period to the detection device, so that important vital signs of the living body such as heartbeat, respiration and the like can be continuously monitored, and personal privacy cannot be leaked in the monitoring process; wearable equipment transmits vital sign information to check out test set through the mode of backscatter, does not need special sensor information acquisition, and the hardware is with low costs.
It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not imply any order of execution, and the order of execution of the processes should be determined by their functions and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (29)
- A backscatter-based detection method applied to a detection device, the detection device comprising an antenna, a transmitter, a receiver, and a processor, the method comprising:the method comprises the steps that a detection device receives a signal transmitted by a first device through a receiver, wherein the signal received by the detection device has a first frequency; wherein the signal transmitted by the first device is a signal transmitted by a backscatter transmitter through an antenna to the detection device, and the first device switches the antenna matching state at a second frequency during the transmission of the signal;the detection device transmits a carrier wave CW through an antenna by using a transmitter in the process of receiving the signal transmitted by the first device;the processor of the detection device determines vital sign detection information based on the first frequency, the second frequency and the frequency of the carrier CW.
- The method of claim 1, prior to the detection device receiving the signal transmitted by the first device through the receiver, the method further comprising:the method comprises the steps that the detection equipment sends request information to at least one tested device, the request information comprises identity identification information of the first device, and the request information is used for requesting the first device to send vital sign detection information.
- The method of claim 1 or 2, further comprising:after receiving the first device transmission signal, the detection device sends a reset signal to the at least one device under test, where the reset signal is used to instruct the at least one device under test to recover to a default state, and the at least one device under test waits for receiving next request information in the default state.
- The method of any one of claims 1-3,the method comprises the steps of including first information in a signal received by the detection equipment, wherein the frequency of the first information is different from the second frequency;the method further comprises the following steps: and the detection equipment confirms the identity of the first equipment according to the first information.
- Method according to any of claims 1-4, the detection device determining vital sign detection information based on the first frequency, the second frequency and the frequency of the carrier CW, comprising:and the detection equipment processes the first frequency, the second frequency and the carrier wave CW frequency in a physical filtering and/or digital filtering mode to determine the vital sign detection information.
- The method of any one of claims 1-5,the vital sign detection information comprises a heart beat frequency and a breathing frequency,the detection device determines vital sign detection information based on the first frequency, the second frequency and the frequency of the carrier CW, including:the detection device determines the heart beat frequency f according to the following formula heart And the respiratory frequency f resp ：f received ＝f c +f bs +(f heart +f resp )Wherein, f received Is said first frequency, f c Is the center frequency, f, of the CW wave bs Is the second frequency.
- The method of any of claims 1-6, further comprising:and the detection equipment determines user identity information corresponding to the first equipment based on the vital sign detection information.
- A backscatter-based detection method applied to a wearable device, the wearable device including an antenna and a backscatter transmitter, the method comprising:a wearable device transmits a signal to the detection device through an antenna using a backscatter transmitter, and the wearable device switches an antenna matching state at a second frequency during transmission of the signal.
- The method of claim 8, prior to the wearable device transmitting a signal to the detection device through an antenna with a backscatter transmitter, the method further comprising:the wearable device receives request information sent by a detection device, wherein the request information comprises identity identification information of a first device, and the request information is used for requesting the first device to send vital sign detection information;and if the wearable equipment identity is consistent with the identity of the first equipment, the wearable equipment determines to transmit a signal to the detection equipment.
- The method of claim 8 or 9, further comprising:and if the identity of the wearable device is inconsistent with the identity of the first device, the wearable device adjusts the state of the antenna, and the RCS of the adjusted radar scattering cross section is smaller than that before the adjustment.
- The method according to any one of claims 8-10, further comprising:the wearable device receives a reset signal sent by the detection device,and the wearable equipment is recovered to a default state, and the wearable equipment waits for receiving the next request information in the default state.
- The method of any one of claims 8-11,the wearable device sends first information in a signal transmitting process, wherein the frequency of the first information is different from the second frequency, and the first information is used for the detection device to confirm the identity of the wearable device.
- The method of any one of claims 8-12,the vital sign detection information comprises a heart beat frequency and/or a respiratory frequency of a user corresponding to the wearable device.
- A detection apparatus, comprising:a receiver for receiving a signal transmitted by a first device, the signal received by the detection device having a first frequency; wherein the signal transmitted by the first device is a signal transmitted by a backscatter transmitter through an antenna to the detection device, and the first device switches the antenna matching state at a second frequency during the transmission of the signal;a transmitter for transmitting a Carrier Wave (CW) through an antenna in a process of receiving a transmission signal of the first device;a detection information determination module for determining vital sign detection information based on the first frequency, the second frequency and the frequency of the carrier CW.
- The detection apparatus of claim 14,the transmitter is further configured to send request information to at least one device under test, where the request information includes identification information of the first device, and the request information is used to request the first device to send vital sign detection information.
- The detection apparatus according to claim 14 or 15,the transmitter is further configured to send a reset signal to the at least one device under test after receiving the first device transmission signal, where the reset signal is used to instruct the at least one device under test to recover to a default state, and the at least one device under test waits to receive next request information in the default state.
- The detection apparatus of any one of claims 14-16,the signal received by the receiver comprises first information, and the frequency of the first information is different from the second frequency;and the equipment identity confirming module is used for confirming the identity of the first equipment according to the first information.
- The detection apparatus of any one of claims 14-17, further comprising:a first filtering processing module, configured to process the first frequency, the second frequency, and the frequency of the carrier CW in a physical filtering manner, and determine the vital sign detection information; and/or the presence of a gas in the gas,and the second filtering processing module is used for processing the first frequency, the second frequency and the frequency of the carrier wave CW in a digital filtering mode to determine the vital sign detection information.
- The detection apparatus of any one of claims 14-18,the vital sign detection information comprises heartbeat frequency information and respiratory frequency information,the detection information determining module is also used for determining the heartbeat frequency f according to the following formula heart And the respiratory frequency f resp ：f received ＝f c +f bs +(f heart +f resp )Wherein, f received Is said first frequency, f c Is the center frequency, f, of the CW wave bs Is the second frequency.
- The detection apparatus of any one of claims 14-19, further comprising:and the user identity determining module is used for determining user identity information corresponding to the first equipment based on the vital sign detection information.
- A wearable apparatus, comprising:a backscatter transmitter to transmit a signal through the antenna to a detection device, and the wearable device to switch an antenna matching state at a second frequency during transmission of the signal.
- The wearable device of claim 21, further comprising:a receiver, configured to receive request information sent by the detection device, where the request information includes identity information of a first device, and the request information is used to request the first device to send vital sign detection information;a determining module, configured to determine to transmit a signal to the detection device if the wearable device identity is consistent with the identity of the first device.
- The wearable device of claim 22, further comprising:and the adjusting module is used for adjusting the state of the antenna under the condition that the identity of the wearable device is inconsistent with the identity of the first device, and the adjusted radar scattering cross section RCS is smaller than the RCS before adjustment.
- The wearable device of any of claims 21-23, wherein,the receiver is further configured to receive a reset signal sent by the detection device,the adjustment module is further configured to restore the wearable device to a default state after the receiver receives the reset signal, where the wearable device waits for receiving a next request message.
- The wearable device of any of claims 21-24, wherein,the backscatter transmitter is further configured to send first information during transmission of the signal, where a frequency of the first information is different from the second frequency, and the first information is used for the detection device to confirm the identity of the wearable device.
- The wearable device of any of claims 21-25, wherein,the vital sign detection information comprises the heart beating frequency and/or the breathing frequency of a user corresponding to the wearable device.
- A detection apparatus, comprising: an antenna, a transmitter, a receiver, a processor and a memory for storing a computer program, the processor invoking and running the computer program stored in the memory performing the method of any one of claims 1 to 7.
- A wearable device, comprising: an antenna, a receiver, a backscatter transmitter, a processor, and a memory for storing a computer program, the processor invoking and executing the computer program stored in the memory performing the method of any of claims 8 to 13.
- A computer-readable storage medium storing a computer program, wherein,the computer program causes a computer to perform the method of any one of claims 1 to 13.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2020/105644 WO2022021166A1 (en) | 2020-07-29 | 2020-07-29 | Backscatter-based detection method and detection device, and wearable device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115428488A true CN115428488A (en) | 2022-12-02 |
Family
ID=80037002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080100083.5A Pending CN115428488A (en) | 2020-07-29 | 2020-07-29 | Detection method based on backscattering, detection equipment and wearable equipment |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115428488A (en) |
| WO (1) | WO2022021166A1 (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100026550A1 (en) * | 2007-07-17 | 2010-02-04 | Rosenbury Erwin T | Handheld Instrument Capable of Measuring Heartbeat and Breathing Motion at a Distance |
| US20150223701A1 (en) * | 2014-02-10 | 2015-08-13 | California Institute Of Technology | Breathing and heartbeat feature extraction and victim detection |
| CN105518481A (en) * | 2013-08-16 | 2016-04-20 | 泰格信息技术有限公司 | Method and system for identifying and finding a range of an object |
| US20160200276A1 (en) * | 2013-08-14 | 2016-07-14 | Iee International Electronics & Engineering S.A. | Radar sensing of vehicle occupancy |
| WO2017088505A1 (en) * | 2015-11-24 | 2017-06-01 | 京东方科技集团股份有限公司 | Smart wearable device and biometric information detection method |
| CN107193000A (en) * | 2017-05-19 | 2017-09-22 | 矽力杰半导体技术(杭州)有限公司 | Object features detection means and method |
| CN109924962A (en) * | 2019-04-03 | 2019-06-25 | 湖南省顺鸿智能科技有限公司 | A kind of non-contact vital sign measuring system and method based on radar |
| CN110087205A (en) * | 2019-04-19 | 2019-08-02 | 上海救要救信息科技有限公司 | It is a kind of for obtaining by the method and apparatus of the underlying parameter of rescuer |
| CN110135378A (en) * | 2019-05-16 | 2019-08-16 | 中国科学技术大学 | A kind of human motion recognition method based on passive reflective signal |
| CN110613436A (en) * | 2018-06-20 | 2019-12-27 | 三星电子株式会社 | Apparatus for measuring biological information |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9323966B2 (en) * | 2014-09-30 | 2016-04-26 | Google Inc. | Device for backscatter communication |
| US10187773B1 (en) * | 2015-07-25 | 2019-01-22 | Gary M. Zalewski | Wireless coded communication (WCC) devices with power harvesting power sources for monitoring state data of objects |
| US20190265473A1 (en) * | 2018-02-23 | 2019-08-29 | Oculus Vr, Llc | Apparatus, systems, and methods for enabling low-power communications via wearers' bodies |
-
2020
- 2020-07-29 WO PCT/CN2020/105644 patent/WO2022021166A1/en active Application Filing
- 2020-07-29 CN CN202080100083.5A patent/CN115428488A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100026550A1 (en) * | 2007-07-17 | 2010-02-04 | Rosenbury Erwin T | Handheld Instrument Capable of Measuring Heartbeat and Breathing Motion at a Distance |
| US20160200276A1 (en) * | 2013-08-14 | 2016-07-14 | Iee International Electronics & Engineering S.A. | Radar sensing of vehicle occupancy |
| CN105518481A (en) * | 2013-08-16 | 2016-04-20 | 泰格信息技术有限公司 | Method and system for identifying and finding a range of an object |
| US20150223701A1 (en) * | 2014-02-10 | 2015-08-13 | California Institute Of Technology | Breathing and heartbeat feature extraction and victim detection |
| WO2017088505A1 (en) * | 2015-11-24 | 2017-06-01 | 京东方科技集团股份有限公司 | Smart wearable device and biometric information detection method |
| CN107193000A (en) * | 2017-05-19 | 2017-09-22 | 矽力杰半导体技术(杭州)有限公司 | Object features detection means and method |
| CN110613436A (en) * | 2018-06-20 | 2019-12-27 | 三星电子株式会社 | Apparatus for measuring biological information |
| CN109924962A (en) * | 2019-04-03 | 2019-06-25 | 湖南省顺鸿智能科技有限公司 | A kind of non-contact vital sign measuring system and method based on radar |
| CN110087205A (en) * | 2019-04-19 | 2019-08-02 | 上海救要救信息科技有限公司 | It is a kind of for obtaining by the method and apparatus of the underlying parameter of rescuer |
| CN110135378A (en) * | 2019-05-16 | 2019-08-16 | 中国科学技术大学 | A kind of human motion recognition method based on passive reflective signal |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022021166A1 (en) | 2022-02-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20210004620A1 (en) | System and method for glucose sensing using millimeter wave radar | |
| US9948642B2 (en) | Multi-modal biometric identification | |
| US10181021B2 (en) | Method and apparatus for off-body detection for wearable device | |
| US9939908B2 (en) | Multi-device authentication | |
| TWI646442B (en) | Survivability detection technology for user authentication | |
| US8866760B2 (en) | User identification based on body-coupled communication | |
| JP2008073462A (en) | Authentication apparatus and method | |
| US10484826B2 (en) | System and device for internet of things | |
| CN105266780A (en) | Intelligent wearable device and detection method for biological characteristic information | |
| JP3507028B2 (en) | Data communication system and biological contact part | |
| JP2008073461A (en) | Authentication apparatus and method | |
| US20160364560A1 (en) | Electronic device and information processing method | |
| KR101796352B1 (en) | Personal Identification System Using the Vein Pattern Identification Apparatus | |
| JP2002058659A (en) | Microwave micromotion sensor | |
| CN109938722B (en) | Data acquisition method and device, intelligent wearable device and storage medium | |
| CN112394352A (en) | Image biological physiological signal pairing method and physiological signal pairing system | |
| CN115428488A (en) | Detection method based on backscattering, detection equipment and wearable equipment | |
| US20080319280A1 (en) | Implantable Biotelemetry Device | |
| CN205107652U (en) | Intelligent wearable device | |
| EP1244384B1 (en) | Patient-identified measuring | |
| CN105852809B (en) | Electronic device and information processing method | |
| KR101641643B1 (en) | Method and Apparatus for Body State Recognition using the Impedance Charateristic Enhanced Electorde | |
| US7890055B1 (en) | Touch field compound field detector personal ID | |
| US20200053536A1 (en) | System and device for internet of things | |
| CN105988584A (en) | Detecting system and mobile electronic apparatus, and method for detecting physiological characteristic thereof method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |