CN212181474U - Passive sensing system - Google Patents
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- CN212181474U CN212181474U CN202020890004.2U CN202020890004U CN212181474U CN 212181474 U CN212181474 U CN 212181474U CN 202020890004 U CN202020890004 U CN 202020890004U CN 212181474 U CN212181474 U CN 212181474U
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Abstract
The utility model provides a passive sensing system relates to the RFID field. The passive sensing tag is arranged on the substance to be detected, so that when the tag receives the polling signal of the signal processing equipment, based on the characteristic that the impedance of the self-sensing antenna changes along with the change of the environment, an echo signal which has the amplitude and the phase which change along with the impedance of the sensing antenna and comprises the label identity data is fed back to the signal processing equipment, therefore, the signal processing equipment can send the echo signal currently fed back by the same passive sensing tag and the pre-stored echo signal under the daily environment to the main control equipment, the main control equipment displays the current echo signal and the pre-stored echo signal corresponding to the same passive sensing tag, a user can know the identity data of the corresponding tag and the ambient environment change condition of the tag in a signal comparison mode at the main control equipment side, and the implementation cost of sensing communication is reduced.
Description
Technical Field
The utility model relates to a RFID (Radio Frequency Identification) field particularly, relates to a passive sensing system.
Background
The RFID technology is a technology for performing communication between a reader/writer and a radio frequency identification tag by using a radio communication link, and as the RFID technology is continuously developed, the application of the radio frequency identification tag is greatly expanded. However, at present, the existing RFID technology still stays at the stage of transmitting the stored identity data by the tag, and the potential functions of the RFID technology are not fully developed.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a passive sensing system, it carries out radio communication through passive sensing label, makes passive sensing label feed back self identity data and the environmental change situation around the label under the condition of not external power to correspondingly reduce sensing communication's implementation cost.
In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, an embodiment of the present invention provides a passive sensing system, where the system includes a main control device, a signal processing device, and at least one passive sensing tag;
each passive sensing tag is arranged on a corresponding substance to be detected, wherein each passive sensing tag comprises a sensing antenna, and the impedance of the sensing antenna changes along with the change of the environment where the corresponding passive sensing tag is located;
the signal processing equipment is used for sending a polling signal to a target passive sensing tag and receiving a target echo signal fed back by the target passive sensing tag based on the impedance change condition of a sensing antenna of the target passive sensing tag, wherein the target echo signal comprises identity data corresponding to the target passive sensing tag;
the signal processing equipment is electrically connected with the main control equipment and used for sending the target echo signal fed back by the target passive sensing tag and the pre-stored echo signal of the target passive sensing tag in the daily environment to the main control equipment for displaying.
In an alternative embodiment, the signal processing device includes a processor, a radio frequency transceiver, and a reader antenna;
the processor is electrically connected with the radio frequency transceiver, the radio frequency transceiver is electrically connected with the reader-writer antenna, and the processor controls the radio frequency transceiver to send a polling signal to a target passive sensing tag through the reader-writer antenna and receive a target echo signal fed back by the target passive sensing tag.
In an alternative embodiment, the signal processing apparatus further comprises a memory;
the memory is used for storing the pre-stored echo signals corresponding to each passive sensing tag in the daily environment;
the processor is electrically connected with the memory and used for extracting the pre-stored echo signal of the target passive sensing tag from the memory and sending the pre-stored echo signal and the target echo signal to the main control equipment for display.
In an alternative embodiment, the master device includes a display screen;
the display screen is electrically connected with a processor of the signal processing equipment in an interface connection mode and used for displaying the picture of the pre-stored echo signal and the target echo signal transmitted by the processor.
In an optional embodiment, the main control device further includes an external control device;
the external control device is electrically connected with the processor of the signal processing equipment in a bus connection mode and used for sending a user instruction to the processor so that the processor executes corresponding operation according to the user instruction.
In an alternative embodiment, the external control device comprises one or more of a mouse, a keyboard, a touch display and a remote control handle.
In an optional embodiment, the passive sensing tag further comprises a tag chip, wherein the tag chip stores the identity data of the passive sensing tag;
the tag chip is electrically connected with the sensing antenna, the sensing antenna is tightly attached to a substance to be detected, the sensing antenna provides energy for the tag chip based on a received carrier signal from the signal processing equipment, and the tag chip feeds back an echo signal to the signal processing equipment through the sensing antenna.
In an optional embodiment, the rf transceiver is a dual-channel transceiver device, and the signal processing apparatus further includes a carrier cancellation circuit, a power amplifier, and a circulator;
a first transmitting port of the radio frequency transceiver is connected with an input end of the power amplifier, an output end of the power amplifier is connected with a first port of the circulator, a second port of the circulator is connected with the reader-writer antenna, and the first transmitting port is used for outputting a polling signal;
a second transmitting port of the radio frequency transceiver is connected with a first input end of the carrier cancellation circuit, a second input end of the carrier cancellation circuit is connected with a third port of the circulator, a receiving port of the radio frequency transceiver is connected with an output end of the carrier cancellation circuit, wherein the second input end is used for receiving a target echo signal acquired by the reader antenna, the second transmitting port is used for outputting a carrier cancellation signal aiming at a leakage carrier from the first transmitting port of the radio frequency transceiver, and the output end of the carrier cancellation circuit is used for outputting the target echo signal after carrier cancellation.
In an optional embodiment, the carrier cancellation circuit includes a combiner, a programmable gain controller, and a low noise amplifier;
the input end of the programmable gain controller is connected with the second transmitting port, and the control end of the programmable gain controller is connected with the processor, wherein the processor is used for controlling the signal gain of the programmable gain controller;
the first input end of the combiner is connected with the third port of the circulator, the second input end of the combiner is connected with the output end of the program-controlled gain controller, the output end of the combiner is connected with the input end of the low-noise amplifier, and the output end of the low-noise amplifier is connected with the receiving port of the radio frequency transceiver.
In an alternative embodiment, the sensing antenna is made of an environment-sensitive material, wherein the environment-sensitive material includes one or more of a heat-sensitive material, a photosensitive material, a humidity-sensitive material, a gas-sensitive material, a magneto-sensitive material, and a sound-sensitive material.
The utility model discloses following beneficial effect has:
the passive sensing tag is arranged on the substance to be detected, so that when the tag receives the polling signal of the signal processing equipment, based on the characteristic that the impedance of the self-sensing antenna changes along with the change of the environment, an echo signal which has the amplitude and the phase which change along with the impedance of the sensing antenna and comprises the identity data of the label is fed back to the signal processing equipment, therefore, the signal processing equipment can send the echo signal currently fed back by the same passive sensing tag and the pre-stored echo signal under the daily environment to the main control equipment, the main control equipment displays the current echo signal and the pre-stored echo signal corresponding to the same passive sensing tag, a user can know the identity data of the corresponding tag and the ambient environment change condition of the tag in a signal comparison mode at the main control equipment side, and the implementation cost of sensing communication is reduced.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic diagram of a system composition of a passive sensing system according to an embodiment of the present invention;
FIG. 2 is one of the schematic device components of the signal processing device of FIG. 1;
FIG. 3 is a second schematic diagram of the signal processing apparatus of FIG. 1;
FIG. 4 is a third schematic diagram of the signal processing apparatus of FIG. 1;
fig. 5 is a schematic diagram of an apparatus composition of the passive sensor tag in fig. 1.
Icon: 10-passive sensing system; 100-a signal processing device; 200-passive sensing tag; 300-a master device; 210-a sensing antenna; 310-a display screen; 320-an external control device; 110-a processor; 120-a radio frequency transceiver; 130-reader antenna; 140-a memory; 150-carrier cancellation circuitry; 160-a power amplifier; 170-a circulator; 151-a combiner; 152-a programmable gain controller; 153-low noise amplifier; 220-tag chip.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Referring to fig. 1, fig. 1 is a schematic diagram of a system composition of a passive sensing system 10 according to an embodiment of the present invention. In the embodiment of the present invention, the wireless communication of the tag can be realized by the passive sensing system 10, so that the tag can feed back the self identity data and the environmental change situation around the tag without an external power supply, and accordingly, the implementation cost of the sensing communication is reduced.
The passive sensing system 10 includes a main control device 300, a signal processing device 100, and at least one passive sensing tag 200, where the signal processing device 100 may communicate with the at least one passive sensing tag 200 through a radio communication link.
In this embodiment, each passive sensor tag 200 is mounted on a corresponding substance to be detected, which is to be detected or marked, and then performs signal transmission through the sensor antenna 210 included in itself. The antenna impedance of the sensing antenna 210 included in each passive sensing tag 200 changes with the change of the environmental condition of the passive sensing tag 200, so that the signal amplitude and the signal phase of the feedback signal of the corresponding passive sensing tag 200 during signal feedback change with the environmental condition.
In this embodiment, the signal processing device 100 may send a polling signal to the target passive sensor tag 200, and receive a target echo signal fed back by the target passive sensor tag 200 based on the impedance change of its own sensor antenna 210. The polling signal is used to instruct the corresponding passive sensor tag 200 to perform data feedback, and the polling signal may include, but is not limited to, one or more combinations of a tag position positioning instruction, a tag operation detection instruction, and a tag data reading instruction. The tag position positioning instruction is used for indicating the corresponding passive sensing tag 200 to perform position positioning, the tag operation detection instruction is used for indicating the corresponding passive sensing tag 200 to detect the operation state of the tag, and the tag data reading instruction is used for indicating the corresponding passive sensing tag 200 to extract the stored data for feedback. In addition, the signal processing device 100 may broadcast a carrier signal for providing energy, so that each sensing antenna 210 may use the energy of the signal obtained by coupling as the energy for operating the passive sensing tag 200 when receiving the carrier signal transmitted by the signal processing device 100.
In an implementation manner of this embodiment, when the signal processing apparatus 100 sends a polling signal, the polling signal may be loaded with Identity data (i.e., ID (Identity Document) information of a corresponding tag) of the target passive sensor tag 200 to which the signal processing apparatus 100 is directed. In this case, when a certain passive sensor tag 200 receives the polling signal from the signal processing device 100 through its own sensor antenna 210, it will ensure that the passive sensor tag 200 is operated by the energy carried by the received carrier signal, and determine whether its own identity data is consistent with the identity data of the target passive sensor tag 200 that needs to communicate in the polling signal.
When the identity data of the passive sensor tag 200 receiving the polling signal is consistent with the identity data of the target passive sensor tag 200 in the polling signal, the passive sensor tag 200 receiving the polling signal feeds back a target echo signal including its identity data to the signal processing device 100 based on the antenna impedance change of its own sensor antenna 210. And when the identity data of the passive sensor tag 200 receiving the polling signal is inconsistent with the identity data of the target passive sensor tag 200 in the polling signal, the passive sensor tag 200 receiving the polling signal will not feed back the corresponding echo signal.
In another implementation manner of this embodiment, when the signal processing device 100 sends a polling signal, the identity data of any specific passive sensor tag 200 is not loaded in the polling signal, so that each passive sensor tag 200 that receives the polling signal can be used as a target passive sensor tag 200, each passive sensor tag 200 that receives the polling signal correspondingly feeds back a target echo signal including its own identity data to the signal processing device 100, and the signal processing device 100 automatically analyzes the target echo signal fed back by each target passive sensor tag 200 according to an anti-collision algorithm.
In this embodiment, the signal processing device 100 is electrically connected to the main control device 300, and is configured to send a target echo signal fed back by the target passive sensor tag 200 and a pre-stored echo signal of the target passive sensor tag 200 in a daily environment to the main control device 300 for display. Wherein, after receiving the target echo signal from the target passive sensing tag 200, the signal processing device 100, the pre-stored echo signal corresponding to the target passive sensor tag 200 is determined from the stored pre-stored echo signals of all the passive sensor tags 200 in the daily environment, then, the target echo signal and the pre-stored echo signal corresponding to the same passive sensor tag 200 are sent to the main control device 300, and the main control device 300 displays the target echo signal and the pre-stored echo signal corresponding to the same passive sensor tag 200, so that a user can know the difference between the two echo signals of the same passive sensor tag 200 in the aspects of waveform, frequency spectrum, amplitude, phase and the like in a signal comparison manner at the main control device 300 side, and the change condition of the environment around the corresponding tag is determined according to the specific difference condition.
In the above process, the passive sensor tag 200 of the present invention does not need to separately construct a circuit for measuring the environmental change condition, or externally connect a hardware device for measuring the environmental change condition, and can directly feed back an echo signal, which has an amplitude and a phase changed along with the impedance of the sensor antenna 210 and includes the tag's own identity data, to the signal processing device 100 when the tag receives the polling signal matched with the identity, so that the signal processing device 100 can send the echo signal currently fed back by the same passive sensor tag 200 and the pre-stored echo signal in the daily environment to the main control device 300, and the main control device 300 displays the current echo signal and the pre-stored echo signal corresponding to the same passive sensor tag 200, so that the user can know the identity data of the corresponding tag and the environmental change condition around the tag in a signal comparison manner at the main control device 300 side, and the implementation cost of sensing communication is reduced. The passive sensing tag 200 feeds back the environmental change condition around the tag through the waveform condition of the echo signal without an external power supply.
Optionally, referring to fig. 2, fig. 2 is one of schematic device components of the signal processing device 100 in fig. 1. In this embodiment, the signal processing apparatus 100 may include a processor 110, a radio frequency transceiver 120, and a reader antenna 130.
The processor 110 is electrically connected to the rf transceiver 120, the rf transceiver 120 is electrically connected to the reader antenna 130, and the processor 110 controls the rf transceiver 120 to send a polling signal to the target passive sensing tag 200 through the reader antenna 130 and receive a target echo signal fed back by the target passive sensing tag 200. The rf transceiver 120 may be a single channel transceiver device or a dual channel transceiver device.
The processor 110 and the rf transceiver 120 may be interconnected through an fmc (fpga Mezzanine card) board socket, or directly interconnected on the same printed circuit board.
Wherein the processor 110 may employ XilinxTMZynq of (Sailing Co.)TMAn FPGA (Field Programmable Gate Array) as a signal processing device and an Arm embedded in the FPGATMProcessor hardbanding, by ArmTMThe processor hardmac runs an embedded Ubuntu (Wuban graph) operating system to implement the functions of the processor 110.
In addition, the main control device 300 includes a display screen 310, and the display screen 310 is electrically connected to the processor 110 of the signal processing device 100 through an interface connection, and is configured to perform image display on the pre-stored echo signal and the target echo signal transmitted by the processor 110. In an implementation manner of this embodiment, the display screen 310 is electrically connected to the processor 110 through an HDMI (High Definition Multimedia Interface).
The main control device 300 may further include an external control device 320, where the external control device 320 is electrically connected to the processor 110 of the signal processing device 100 through a bus connection manner, and is configured to send a user instruction to the processor 110, so that the processor 110 executes a corresponding operation according to the user instruction. The external control device 320 includes one or more of a mouse, a keyboard, a touch display, and a remote control handle. The user instruction may be an instruction selected by the user for the target passive sensor tag 200, may be an instruction to load or delete the identity data of a certain target passive sensor tag 200 in the polling signal, and may be an instruction to switch the target echo signal and the pre-stored echo signal of another target passive sensor tag 200 displayed on the display screen 310. In an implementation manner of this embodiment, the external control device 320 is electrically connected to the processor 110 through a Universal Serial Bus (USB) Bus.
Optionally, referring to fig. 3, fig. 3 is a second schematic diagram illustrating an apparatus composition of the signal processing apparatus 100 in fig. 1. In this embodiment, the signal processing apparatus 100 may further include a memory 140.
The memory 140 is configured to store a pre-stored echo signal corresponding to each passive sensor tag 200 in a daily environment. The processor 110 is electrically connected to the memory 140, and is configured to extract a pre-stored echo signal of the target passive sensor tag 200 from the memory 140, and send the pre-stored echo signal and the target echo signal to the main control device 300 for display.
Alternatively, referring to fig. 4, fig. 4 is a third schematic diagram of an apparatus composition of the signal processing apparatus 100 in fig. 1. In this embodiment, when the rf transceiver 120 is a dual channel transceiver device, the signal processing apparatus 100 may further include a carrier cancellation circuit 150, a power amplifier 160 and a circulator 170.
In this embodiment, the RF transceiver 120 may employ ADITMThe agile transceiver chip AD9361 of the company acts as a dual channel rf transceiver device.
A first transmitting port of the rf transceiver 120 is connected to an input terminal of the power amplifier 160, an output terminal of the power amplifier 160 is connected to a first port of the circulator 170, and a second port of the circulator 170 is connected to the reader/writer antenna 130, wherein the first transmitting port is configured to output a polling signal, so as to transmit the polling signal to a broadcast through the reader/writer antenna 130 via the power amplifier 160 and the circulator 170.
Wherein, the second transmitting port of the rf transceiver 120 is connected to the first input terminal of the carrier cancellation circuit 150, the second input terminal of the carrier cancellation circuit 150 is connected to the third port of the circulator 170, and the receiving port of the rf transceiver 120 is connected to the output terminal of the carrier cancellation circuit 150. The second input end is configured to receive a target echo signal acquired by the reader antenna 130, and the carrier cancellation circuit 150 performs carrier cancellation on a leakage carrier received by the reader antenna 130 from the first transmitting port of the radio frequency transceiver 120, so as to weaken interference of the leakage carrier on the target echo signal of the target passive sensor tag 200. The second transmitting port of the radio frequency transceiver 120 is configured to output a carrier cancellation signal for a leakage carrier from the first transmitting port of the radio frequency transceiver 120, and the output end of the carrier cancellation circuit 150 is configured to output a target echo signal after carrier cancellation, where the leakage carrier is a self-transmitted polling signal and/or carrier signal acquired by the signal processing device 100 through the reader antenna 130.
In the present embodiment, the carrier cancellation circuit 150 includes a combiner 151, a programmable gain controller 152, and a low noise amplifier 153.
The carrier cancellation circuit 150 uses the input terminal of the programmable gain controller 152 as its first input terminal. An input terminal of the programmable gain controller 152 is connected to the second transmitting port of the rf transceiver 120, and a control terminal of the programmable gain controller 152 is connected to the processor 110. Wherein the processor 110 is operable to control the signal gain of the programmable gain controller 152.
The carrier cancellation circuit 150 uses the first input terminal of the combiner 151 as its second input terminal. A first input end of the combiner 151 is connected to a third port of the circulator 170, and a second input end of the combiner 151 is connected to an output end of the program-controlled gain controller 152.
The carrier cancellation circuit 150 uses the output terminal of the low noise amplifier 153 as its output terminal. An input end of the low noise amplifier 153 is connected to an output end of the combiner 151, and an output end of the low noise amplifier 153 is connected to a receiving port of the radio frequency transceiver 120.
Optionally, referring to fig. 5, fig. 5 is a schematic diagram of an apparatus composition of the passive sensor tag 200 in fig. 1. In the present embodiment, the passive sensor tag 200 includes a tag chip 220 and a sensor antenna 210.
The tag chip 220 is electrically connected to the sensing antenna 210. The tag chip 220 may be configured to perform signal transceiving and data storage, and the passive sensor tag 200 may determine whether to respond to the received polling signal according to the tag chip 220, and feed back an echo signal to the signal processing device 100 when determining that a response is required. The tag chip 220 can be used to store the identity data of the passive sensing tag 200. The sensing antenna 210 may provide energy to the tag chip 220 based on the received carrier signal from the signal processing device 100, and the tag chip 220 feeds back an echo signal to the signal processing device 100 through the sensing antenna 210.
In an implementation manner of this embodiment, the tag chip 220 may adopt an RFID chip conforming to ISO18000-6C protocol.
The sensing antenna 210 is made of an environment-sensitive material and is used for sensing the environment change condition of the corresponding tag. Wherein the environment sensitive material can include, but is not limited to, one or more of a heat sensitive material, a light sensitive material, a humidity sensitive material, a gas sensitive material, a magnetic sensitive material and a sound sensitive material. The thermosensitive material can be used for detecting the temperature change condition of a substance contacted with the sensing antenna 210, the photosensitive material can be used for detecting the illumination change condition of the sensing antenna 210, the humidity sensitive material can be used for detecting the humidity change condition of the environment where the sensing antenna 210 is located, the gas sensitive material can be used for detecting the gas composition change condition of the environment where the sensing antenna 210 is located, the magnetic sensitive material can be used for detecting the magnetic field intensity change condition of the environment where the sensing antenna 210 is located, and the acoustic sensitive material can be used for detecting the sound intensity change condition of the environment where the sensing antenna 210 is located.
In an implementation manner of this embodiment, the sensing antenna 210 is closely attached to the substance to be detected when the passive sensing tag 200 is mounted on the corresponding substance to be detected. The shape of the sensing antenna 210 may be a symmetrical bent structure, a symmetrical annular structure, or a symmetrical circular or rectangular planar structure, and the specific shape may be configured differently according to the requirement.
In summary, in the passive sensing system provided by the embodiment of the present invention, the passive sensing tag is mounted on the substance to be detected, so that when the tag receives the polling signal of the signal processing device, based on the characteristic that the impedance of the sensing antenna changes along with the change of the environment, the signal processing device feeds back an echo signal with an amplitude and a phase that change along with the impedance of the sensing antenna and includes the identity data of the tag itself, so that the signal processing device can send the echo signal currently fed back by the same passive sensing tag and the pre-stored echo signal in the daily environment to the main control device, the main control device displays the current echo signal and the pre-stored echo signal corresponding to the same passive sensing tag, and the user can know the identity data of the corresponding tag and the change situation of the environment around the tag through signal comparison at the main control device side, and the implementation cost of sensing communication is reduced. Wherein, the utility model provides a passive sensing label can feed back self identity data and the environmental change situation around the label under the condition of not external power source.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A passive sensing system is characterized by comprising a main control device, a signal processing device and at least one passive sensing tag;
each passive sensing tag is arranged on a corresponding substance to be detected, wherein each passive sensing tag comprises a sensing antenna, and the impedance of the sensing antenna changes along with the change of the environment where the corresponding passive sensing tag is located;
the signal processing equipment is used for sending a polling signal to a target passive sensing tag and receiving a target echo signal fed back by the target passive sensing tag based on the impedance change condition of a sensing antenna of the target passive sensing tag, wherein the target echo signal comprises identity data corresponding to the target passive sensing tag;
the signal processing equipment is electrically connected with the main control equipment and used for sending the target echo signal fed back by the target passive sensing tag and the pre-stored echo signal of the target passive sensing tag in the daily environment to the main control equipment for displaying.
2. The system of claim 1, wherein the signal processing device comprises a processor, a radio frequency transceiver, and a reader antenna;
the processor is electrically connected with the radio frequency transceiver, the radio frequency transceiver is electrically connected with the reader-writer antenna, and the processor controls the radio frequency transceiver to send a polling signal to a target passive sensing tag through the reader-writer antenna and receive a target echo signal fed back by the target passive sensing tag.
3. The system of claim 2, wherein the signal processing device further comprises a memory;
the memory is used for storing the pre-stored echo signals corresponding to each passive sensing tag in the daily environment;
the processor is electrically connected with the memory and used for extracting the pre-stored echo signal of the target passive sensing tag from the memory and sending the pre-stored echo signal and the target echo signal to the main control equipment for display.
4. The system of claim 3, wherein the master device comprises a display screen;
the display screen is electrically connected with a processor of the signal processing equipment in an interface connection mode and used for displaying the picture of the pre-stored echo signal and the target echo signal transmitted by the processor.
5. The system of claim 4, wherein the master device further comprises an external control apparatus;
the external control device is electrically connected with the processor of the signal processing equipment in a bus connection mode and used for sending a user instruction to the processor so that the processor executes corresponding operation according to the user instruction.
6. The system of claim 5, wherein the external control device comprises one or more of a mouse, a keyboard, a touch display, and a remote control handle.
7. The system of claim 2, wherein the passive sensor tag further comprises a tag chip, wherein the tag chip stores the identity data of the passive sensor tag;
the tag chip is electrically connected with the sensing antenna, the sensing antenna is tightly attached to a substance to be detected, the sensing antenna provides energy for the tag chip based on a received carrier signal from the signal processing equipment, and the tag chip feeds back an echo signal to the signal processing equipment through the sensing antenna.
8. The system according to any one of claims 2-7, wherein the radio frequency transceiver is a dual channel transceiver device, and the signal processing apparatus further comprises a carrier cancellation circuit, a power amplifier and a circulator;
a first transmitting port of the radio frequency transceiver is connected with an input end of the power amplifier, an output end of the power amplifier is connected with a first port of the circulator, a second port of the circulator is connected with the reader-writer antenna, and the first transmitting port is used for outputting a polling signal;
a second transmitting port of the radio frequency transceiver is connected with a first input end of the carrier cancellation circuit, a second input end of the carrier cancellation circuit is connected with a third port of the circulator, a receiving port of the radio frequency transceiver is connected with an output end of the carrier cancellation circuit, wherein the second input end is used for receiving a target echo signal acquired by the reader antenna, the second transmitting port is used for outputting a carrier cancellation signal aiming at a leakage carrier from the first transmitting port of the radio frequency transceiver, and the output end of the carrier cancellation circuit is used for outputting the target echo signal after carrier cancellation.
9. The system of claim 8, wherein the carrier cancellation circuit comprises a combiner, a programmable gain controller, and a low noise amplifier;
the input end of the programmable gain controller is connected with the second transmitting port, and the control end of the programmable gain controller is connected with the processor, wherein the processor is used for controlling the signal gain of the programmable gain controller;
the first input end of the combiner is connected with the third port of the circulator, the second input end of the combiner is connected with the output end of the program-controlled gain controller, the output end of the combiner is connected with the input end of the low-noise amplifier, and the output end of the low-noise amplifier is connected with the receiving port of the radio frequency transceiver.
10. The system of claim 1, wherein the sensing antenna is made of an environmentally sensitive material.
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| CN202020890004.2U CN212181474U (en) | 2020-05-22 | 2020-05-22 | Passive sensing system |
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| CN202020890004.2U CN212181474U (en) | 2020-05-22 | 2020-05-22 | Passive sensing system |
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