CN110706451A - Anti-lost device, anti-lost system and anti-lost method - Google Patents
Anti-lost device, anti-lost system and anti-lost method Download PDFInfo
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- CN110706451A CN110706451A CN201910978455.3A CN201910978455A CN110706451A CN 110706451 A CN110706451 A CN 110706451A CN 201910978455 A CN201910978455 A CN 201910978455A CN 110706451 A CN110706451 A CN 110706451A
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
- G08B21/0269—System arrangements wherein the object is to detect the exact location of child or item using a navigation satellite system, e.g. GPS
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
- G08B21/0266—System arrangements wherein the object is to detect the exact distance between parent and child or surveyor and item
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Abstract
The anti-lost device is in communication connection with monitoring equipment through a GSM network; comprises the following steps: a core processor; the GPS positioning module is connected with the core processor, and is used for positioning through a GPS and transmitting positioning information to the core processor; the GSM module is connected with the core processor, and the core processor transmits the positioning information to the monitoring equipment through the GSM module; the UWB ranging module is connected with the core processor, is in communication connection with a UWB communication module arranged in the monitoring equipment, measures the distance between the UWB ranging module and the UWB communication module and obtains distance information through calculation of the monitoring equipment; and the alarm module is connected with the core processor, judges the current relative position state of the anti-lost device by the monitoring equipment, generates a state mark word, and reads the state mark word by the core processor to judge and send a corresponding alarm signal. The invention also relates to a system and a method for preventing the lost. The invention integrates the GPS technology and the UWB technology, effectively makes up the defect that the positioning information cannot be acquired when the GPS signal is weak, and realizes indoor and outdoor full coverage.
Description
Technical Field
The invention relates to a device, a System and a method for preventing the person from being lost, in particular to a device, a System and a method for preventing the person from being lost, which are integrated with a Global Positioning System (GPS) satellite Positioning technology and a Ultra Wide Band (UWB) ranging technology.
Background
With the acceleration of the pace of life and the improvement of the living standard of people, the tourism travel market in China is increasingly developed, more and more people choose to bring children out for vacation and travel during weekends, minor vacations or cold and hot vacations, and the travel destinations are usually amusement parks, museums, large animal and plant parks and the like. In such a complicated environment and many people, if a child is lost, the conventional search method is usually: the lost condition (the lost time and direction of children) is informed to the staff who play the venue at the place where the children are, and the staff can search the lost condition by broadcasting or starting the family and surrounding people to call everywhere, but the lost condition is usually not good.
Most of devices with the anti-lost function in the market at the present stage are based on a GPS positioning technology, positioning information of personnel wearing the anti-lost device is monitored, meanwhile, an electronic fence in a certain range is arranged, when the position of the personnel wearing the anti-lost device exceeds the range of the electronic fence, an alarm is triggered, monitoring equipment can provide the positioning information and the movement track of the lost personnel, and therefore the monitoring equipment effectively helps guardians to smoothly retrieve the lost target personnel.
The outstanding disadvantages of this method are: the functionality and performance of an anti-lost device relying solely on GPS positioning technology is limited by the positioning capabilities of the GPS. When the GPS signal is not good, especially in indoor environments such as large stadiums, the expected effect cannot be achieved by using the GPS positioning method alone.
Based on the above, if the anti-lost device only relies on the GPS satellite positioning technology, it is impossible to realize a highly reliable anti-lost function. Therefore, the invention provides a lost-motion prevention device, a lost-motion prevention system and a lost-motion prevention method which integrate a GPS satellite positioning technology and a UWB ranging technology, realizes a lost-motion prevention function in indoor and outdoor environments, and solves the problems in the prior art.
Disclosure of Invention
The invention aims to provide a lost-prevention device, a lost-prevention system and a lost-prevention method, which are used for effectively overcoming the defect that positioning information cannot be acquired when a GPS signal is weak in an indoor environment by fusing a GPS satellite positioning technology and a UWB ranging technology and realizing the application range of indoor and outdoor full coverage.
In order to achieve the above object, the present invention provides an anti-lost device, which is connected to a monitoring device through a GSM network; comprises the following steps: a core processor; the GPS positioning module is connected with the core processor, positions the current position of the core processor through a GPS and transmits positioning information to the core processor; the GSM module is connected with the core processor and is in communication connection with the monitoring equipment through a GSM network, and the core processor transmits the positioning information to the monitoring equipment through the GSM module; the UWB ranging module is connected with the core processor and is in communication connection with a UWB ranging module arranged in the monitoring equipment, the point-to-point distance between the UWB ranging module and the UWB ranging module is measured, and the monitoring equipment calculates the distance information; and the alarm module is connected with the core processor, the monitoring equipment judges the current relative position state of the anti-lost device according to the positioning information or the distance information to generate a state mark word, the state mark word is transmitted to the anti-lost device through a GSM network, and the core processor controls the alarm module to send out a corresponding alarm signal according to the state mark word.
The UWB ranging module sends ranging signals to the UWB ranging module in the monitoring equipment and receives echo signals fed back by the UWB ranging module in the monitoring equipment, and according to the time difference between the sending ranging signals and the receiving echo signals, the monitoring equipment calculates the point-to-point distance between the two UWB ranging modules according to the time difference between the sending ranging signals and the receiving echo signals, and obtains distance information.
The alarm module comprises a sound alarm module, a flash alarm module and a vibration alarm module which are respectively connected with the core processor through circuits.
The anti-lost device further comprises: and the storage module is connected with the core processor and stores the state flag words, the time information, the positioning information and the distance information.
The anti-lost device further comprises: and the power supply module is respectively connected with the core processor, the GPS positioning module, the UWB ranging module, the GSM module, the alarm module and the storage module and provides working voltage.
The invention also provides an anti-lost system, which comprises the anti-lost device and monitoring equipment in communication connection with the anti-lost device through a GSM network.
The invention also provides a method for preventing the lost, which is realized by adopting the system for preventing the lost and comprises the following steps:
s1, performing power-on initialization and self-checking on the anti-lost device, wherein the initial state is a safe state;
s2, core processor interval T1Awakening from the sleep mode, and judging the strength of the current GPS signal; if the GPS signal is strong, continuing S3; if the GPS signal is weak, continuing S4;
s3, acquiring positioning information of the anti-lost device through the GPS positioning module, sending the positioning information to the monitoring equipment through the GSM network, judging the relative position state between the anti-lost device and the monitoring equipment by the monitoring equipment, taking a preset electronic fence as a criterion, comparing to obtain a current state flag word, and continuing to S5;
s4, obtaining distance information between the anti-lost device and the monitoring equipment through a UWB ranging module, meanwhile, obtaining a relative position state in the monitoring equipment through a UWB communication module, taking a preset electronic fence as a criterion by the monitoring equipment, obtaining a current state flag word after comparison, and continuing to S5;
s5, the monitoring device takes corresponding operation according to the current status flag word, if the monitoring device is in the safe state, the monitoring device keeps the current state, and if the monitoring device is in the alarm state, the monitoring device sends out alarms of different levels according to corresponding alarm levels;
s6, the monitoring device sends status flag words, time information, positioning information or distance information to the anti-lost device through the GSM network, the core processor of the anti-lost device judges the status flag words and determines the current state, if the core processor is in a safe state, the core processor continues to maintain the current state and continues to S8; if the alarm state is in the alarm state, controlling the alarm module to send out an alarm signal of a corresponding grade according to the corresponding alarm grade, and continuing S7;
s7, when the monitoring personnel retrieve the personnel wearing the anti-lost device, the monitoring personnel touch a warning releasing button on the anti-lost device, and the core processor detects a warning releasing instruction and restores the state of the anti-lost device to a safe state;
s8, storing the current status flag word, time information, location information, or distance information in the memory, and proceeding to S2.
The step S1 specifically includes the following steps:
s11, the switch of the anti-lost device is turned on, and a power supply conversion circuit in a power supply module converts the voltage output by the rechargeable battery to supply power for the core processor, the GPS positioning module, the UWB ranging module, the GSM module, the alarm module and the storage module;
and S12, initializing a core processor of the anti-lost device, and detecting a GPS positioning module, a UWB ranging module, a GSM module, an alarm module and a storage module which are connected with the core processor to ensure that the modules work normally.
The step S3 specifically includes the following steps:
s31, the core processor accesses the GPS positioning module to acquire the longitude, latitude and altitude positioning information of the position of the anti-lost device, and transmits the information to the core processor;
s32, the core processor packages the received positioning information of the anti-lost device together with the current time information according to a communication protocol;
s33, the core processor transmits the packed data to the monitoring equipment through the GSM module;
s34, after receiving the positioning information of the anti-lost device, the monitoring equipment collects the positioning information of the longitude, the latitude and the altitude of the position where the monitoring equipment is located, and calculates the distance information and the relative position state between the monitoring equipment and the anti-lost device;
s35, the monitoring equipment further judges the state of the anti-lost device according to whether the relative position state exceeds the range of a preset primary fence or a preset secondary fence;
wherein, the device of preventing wandering away sets up three kinds of states: a safety state, a primary alarm state and a secondary alarm state, and writing codes representing each state into a state flag word;
if the anti-lost device is positioned in the primary fence, the anti-lost device is in a safe state; if the anti-lost device is positioned between the primary fence and the secondary fence, the anti-lost device is in a primary alarm state; and if the anti-lost device exceeds the secondary fence, the anti-lost device is in a secondary alarm state.
The step S4 specifically includes the following steps:
s41, the UWB ranging module sends ranging signals to the UWB ranging module in the monitoring equipment, the point-to-point distance between the anti-lost device and the monitoring equipment is measured, and the monitoring equipment obtains distance information through calculation;
s42, the monitoring equipment judges whether the current position state of the anti-lost device is a safe state, a primary alarm state or a secondary alarm state according to whether the received distance information exceeds the range of a preset primary fence or a secondary fence, and writes a code representing each state into a state flag word;
if the anti-lost device is positioned in the primary fence, the anti-lost device is in a safe state; if the anti-lost device is positioned between the primary fence and the secondary fence, the anti-lost device is in a primary alarm state; and if the anti-lost device exceeds the secondary fence, the anti-lost device is in a secondary alarm state.
In S5, the specific steps are:
if the anti-lost device is in a safe state, the monitoring equipment does not give an alarm;
if the anti-lost device is in a primary alarm state, the monitoring equipment sends out a low-frequency vibration alarm;
if the anti-lost device is in a secondary alarm state, the monitoring equipment gives out sound, flash and high-frequency vibration alarm. In S6, the specific steps are:
if the anti-lost device is in a safe state, the alarm module is not triggered through the core processor;
if the anti-lost device is in a primary alarm state, triggering an alarm module through a core processor to only send out a low-frequency vibration alarm signal;
if the anti-lost device is in a secondary alarm state, the alarm module is triggered by the core processor to simultaneously send out sound, flash and high-frequency vibration alarm signals. In summary, compared with the prior art, the anti-lost device, the anti-lost system and the anti-lost method provided by the invention have the following outstanding advantages:
1. the method combines the UWB-based ranging technology and the GPS satellite positioning technology, and effectively overcomes the defect that the traditional single GPS-based anti-lost device cannot effectively acquire positioning information when the GPS signal is weak; especially, in an indoor environment, when the GPS can not work smoothly, the distance information can be accurately measured by using the UWB-based ranging technology, so that the monitoring personnel can master the position information of the monitored personnel in real time, the indoor and outdoor full coverage is realized, and the application range of the anti-lost device is expanded.
2. The two conditions of primary alarm and secondary alarm are distinguished by setting a secondary alarm strategy, namely setting a secondary alarm distance, and the development condition of the situation of the monitoring personnel is reminded by correspondingly setting different alarm strategies. If the current situation is in a first-level alarm state, the anti-lost device and the monitoring equipment only send out low-frequency vibration; if the current situation is in the second-level alarm state, the anti-lost device and the monitoring equipment emit high-frequency vibration and cooperate with sound alarm and light flicker, so that the emergency degree of the current event of related personnel is effectively reminded, and the classification processing is convenient according to specific requirements.
Drawings
FIG. 1 is a schematic diagram of an anti-lost system of the present invention;
FIG. 2 is a schematic view of the anti-lost device of the present invention;
fig. 3 is a flowchart of a core processor in the anti-lost device of the present invention.
Detailed Description
The technical contents, construction features, achieved objects and effects of the present invention will be described in detail by preferred embodiments with reference to fig. 1 to 3.
As shown in fig. 1 and fig. 2, the anti-lost device provided by the present invention is communicatively connected to a monitoring device through a GSM (Global System for Mobile Communications) network; comprises the following steps: a core processor 1; the GPS positioning module 2 is connected with the core processor 1 through a circuit, positions the current position of the core processor 1 through a GPS, and transmits positioning information to the core processor 1; the GSM module 4 is connected with the core processor 1 through a circuit and is in communication connection with the monitoring equipment through a GSM network, and the core processor 1 transmits the positioning information to the monitoring equipment through the GSM module 4; a UWB ranging module 3, which is connected to the core processor 1 through a circuit, and is in communication connection with a UWB communication module (not shown) provided in the monitoring device, measures a point-to-point distance between the UWB communication module and the UWB ranging module, and calculates distance information from the monitoring device; and the alarm module 5 is connected with the core processor 1 through a circuit, the monitoring equipment judges the current relative position state of the anti-lost device according to the positioning information or the distance information to generate a state mark word, the state mark word is transmitted to the anti-lost device through the GSM network 4, the core processor 1 judges whether to send out an alarm according to the state mark word, and if the state is the alarm state, the alarm module 5 is controlled to send out a corresponding alarm signal.
In the preferred embodiment of the present invention, the core processor 1 is implemented by a single chip microcomputer with a model number stm32f 103.
In the preferred embodiment of the present invention, the GPS positioning module 2 is implemented by a dedicated GPS chip with a model number of SIM7100CE, and is connected to the core processor 1 through an SPI (Serial Peripheral Interface) bus; the core controller 1 passes through the periodic interval T1And accessing the GPS positioning module 2 to acquire positioning information.
In the preferred embodiment of the present invention, the GSM module 4 is connected to the core processor 1 through a serial port. The GSM module comprises a GSM dedicated chip with model number SIM7100CE, a SIM card and related circuitry, for implementing information interaction between the core processor 1 and the monitoring device. The SIM7100CE chip is a 4G full-network universal module and integrates a GPS positioning function.
In the preferred embodiment of the present invention, the UWB ranging module 3 is implemented by a special UWB chip with a model DW1000, and is connected to the core processor 1 through an SPI bus. This UWB ranging module 3 is controlled by core processor 1, sends the range finding signal to the UWB communication module in the supervisory equipment, and the echo signal of receiving by UWB communication module feedback, supervisory equipment passes through the round-trip signal, calculates the time difference between sending the range finding signal and receiving the echo signal, and then calculates the distance between the UWB ranging module in UWB ranging module 3 and the supervisory equipment, acquires distance information.
The UWB technique, also known as the ultra wideband technique, is a carrier-free communication technique that uses nanosecond-level non-sinusoidal narrow pulses as positioning carriers, precisely measures the time of flight, and multiplies the propagation rate of electromagnetic waves by the required time to find the distance between two points. The UWB technology is used for ranging, and the method has the outstanding advantages of high ranging precision, low complexity, high safety and the like, and the ranging precision can reach 10cm in an indoor environment, so that the method is often used for realizing indoor high-precision positioning.
In the preferred embodiment of the present invention, the alarm module 5 comprises an audio alarm module, a flash alarm module and a vibration alarm module which are respectively connected with the core processor 1 through circuits. The sound alarm module is realized by adopting a buzzer, is connected with the core processor 1 through an I/O (input/output) pin, and drives the buzzer to start and send out alarm sound after the core processor 1 outputs TTL (Transistor-Transistor Logic) level and amplifies the TTL level by a triode amplifying circuit. The flash alarm module is realized by adopting an LED lamp and is connected with the core processor 1 through an I/O pin, the core processor 1 drives the LED lamp to be lightened through outputting a TTL level, and the LED lamp flashes through the height change of the TTL level, so that alarm flash is sent out. The vibration alarm module is connected with the core processor 1 through an I/O pin, the core processor 1 drives the vibration alarm module to start vibration by outputting a TTL level, and controls the vibration frequency of the vibration alarm module by controlling the waveform frequency output by the TTL level.
Further, the anti-lost device further comprises: and the storage module 6 is connected with the core processor 1 through an SPI bus and is used for storing status flag words, time information, positioning information, distance information and the like.
Further, the anti-lost device further comprises: and the power supply module (not shown) is respectively connected with the core processor 1, the GPS positioning module 2, the UWB ranging module 3, the GSM module 4, the alarm module 5 and the storage module 6 through circuits to provide working voltage for the core processor, the GPS positioning module 2, the UWB ranging module 3, the GSM module 4, the alarm module 5 and the storage module 6.
The power supply module comprises a rechargeable battery, a power supply conversion circuit and a switching circuit which are connected in sequence. The rechargeable battery adopts a rechargeable lithium nickel battery. The power supply conversion circuit has a voltage conversion function, and converts input voltage during battery power supply or external power supply into working voltage for normal use of the core processor 1, the GPS positioning module 2, the UWB ranging module 3, the GSM module 4, the alarm module 5 and the storage module 6. The switching circuit is composed of a field effect transistor and peripheral circuits thereof, and when external power supply is adopted, the switching circuit takes the external power supply as voltage input, thereby not only providing working voltage for the anti-lost device, but also charging the rechargeable battery; when the battery is used for power supply, the switching circuit takes the rechargeable battery as voltage input, provides working voltage for the anti-lost device and simultaneously cuts off the connection with the external power supply interface.
As shown in fig. 1, the present invention further provides an anti-lost system, which includes the above-mentioned anti-lost device, and a monitoring device communicatively connected to the anti-lost device via a GSM network (including a 2G/3G/4G network).
The core processor 1 of the anti-lost device judges the strength of the current GPS signal; if the GPS signal is strong, the GPS positioning module 2 is utilized, positioning information of the longitude, the latitude and the altitude of the position of the monitoring device is acquired through a GPS satellite positioning technology, meanwhile, the GSM module 4 is utilized, information interaction is carried out with the monitoring device through a GSM network, the current positioning information of the anti-lost device is transmitted to the monitoring device, the monitoring device calculates the distance information between the monitoring device and the anti-lost device and judges the current position state of the anti-lost device according to the distance information, the relative position state of the anti-lost device is judged by comparing the distance information with an electronic fence, a state mark word is generated, and the state mark word is transmitted to the anti-lost device through the GSM network; if the GPS signal is weak, the UWB ranging module 3 is utilized to measure the point-to-point distance between the monitoring equipment and the monitoring equipment through a UWB communication ranging technology to obtain distance information, the monitoring equipment calculates the relative distance information, the monitoring equipment compares the relative distance information with the electronic fence according to the relative distance information, the relative position state of the anti-lost device is judged, a state mark word is generated, and the state mark word is sent to the anti-lost device through a GSM network; and finally, the core processor 1 controls the alarm module 5 to send out alarm signals of different levels according to the received status flag words (safety, primary alarm and secondary alarm).
As shown in fig. 3, the present invention further provides a method for preventing the person from being lost, which is implemented by using the above-mentioned system for preventing the person from being lost, and comprises the following steps:
s1, performing power-on initialization and self-checking on the anti-lost device, wherein the initial state is a safe state;
s2, the core processor interrupts through the timer and the interval time T1Awakening from the sleep mode, and judging the strength of the current GPS signal; if the GPS signal is strong, continuing S3; if the GPS signal is weak, continuing S4;
s3, acquiring positioning information of the anti-lost device through the GPS positioning module 2, sending the positioning information to the monitoring equipment through the GSM network, judging the relative position state between the anti-lost device and the monitoring equipment by the monitoring equipment, taking a preset electronic fence as a criterion, comparing to obtain a current state mark word, and continuing to S5;
s4, distance information between the anti-lost device and the monitoring equipment is obtained through the UWB ranging module 3, meanwhile, the relative position state is obtained through calculation of the UWB communication module in the monitoring equipment, the monitoring equipment takes a preset electronic fence as a criterion, a current state flag word is obtained after comparison, and S5 is continued;
s5, the monitoring device takes corresponding operation according to the current status flag word, if the monitoring device is in the safe state, the monitoring device keeps the current state, and if the monitoring device is in the alarm state, the monitoring device sends out alarms of different levels according to corresponding alarm levels;
s6, the monitoring device sends status flag words, time information, positioning information or distance information to the anti-lost device through the GSM network, the core processor 1 of the anti-lost device judges the status flag words and determines the current state, if the core processor is in a safe state, the core processor continues to maintain the current state and continues to S8; if the alarm state is in the alarm state, controlling the alarm module 5 to send out an alarm signal of a corresponding grade according to the corresponding alarm grade, and continuing to S7;
s7, when the monitoring personnel retrieve the personnel wearing the anti-lost device, the alarm releasing button on the anti-lost device is triggered, the button is pressed for 3 seconds, the core processor 1 detects a manual alarm releasing instruction, and the state of the anti-lost device is restored to a safe state;
s8, storing the current status flag word, time information, location information, or distance information in the memory 6, and proceeds to S2.
The step S1 specifically includes the following steps:
s11, the switch of the anti-lost device is turned on, a power supply conversion circuit in a power supply module converts the voltage output by the rechargeable battery and supplies power to the core processor 1, the GPS positioning module 2, the UWB ranging module 3, the GSM module 4, the alarm module 5 and the storage module 6;
s12, initializing a core processor 1 of the anti-lost device, and detecting a GPS positioning module 2, a UWB ranging module 3, a GSM module 4, an alarm module 5 and a storage module 6 which are connected with the core processor to ensure that the modules work normally.
The step S3 specifically includes the following steps:
s31, the core processor 1 accesses the GPS positioning module 2 to acquire the positioning information of the longitude, latitude and altitude of the position of the anti-lost device, and transmits the information to the core processor 1;
s32, the core processor 1 performs data packing on the received positioning information of the anti-lost device and the current time information according to the communication protocol;
s33, the core processor 1 transmits the packed data to the monitoring device through the GSM module 4;
s34, after receiving the positioning information of the anti-lost device, the monitoring equipment collects the positioning information of the longitude, the latitude and the altitude of the position where the monitoring equipment is located, and calculates the distance information and the relative position state between the monitoring equipment and the anti-lost device;
s35, the monitoring equipment further judges the state of the anti-lost device according to whether the relative position state exceeds the range of a preset primary fence or a preset secondary fence;
wherein, the device of preventing wandering away sets up three kinds of states: the safety state (code: 00), the primary alarm state (code: 02), the secondary alarm state (code: 03), and the codes are written into the status flag word;
if the anti-lost device is positioned in the primary fence, the anti-lost device is in a safe state; if the anti-lost device is positioned between the primary fence and the secondary fence, the anti-lost device is in a primary alarm state; and if the anti-lost device exceeds the secondary fence, the anti-lost device is in a secondary alarm state.
The step S4 specifically includes the following steps:
s41, the UWB ranging module 3 sends ranging signals to a UWB ranging module in the monitoring equipment, the point-to-point distance between the anti-lost device and the monitoring equipment is measured (distance information can be obtained through time difference calculation), and the monitoring equipment obtains the distance information through calculation;
s42, the monitoring equipment judges whether the current position state of the anti-lost device is a safe state (code: 00), or a primary alarm state (code: 02), or a secondary alarm state (code: 03) according to whether the received distance information exceeds the range of a preset primary fence or secondary fence, and writes the code into a state flag word;
if the anti-lost device is positioned in the primary fence, the anti-lost device is in a safe state; if the anti-lost device is positioned between the primary fence and the secondary fence, the anti-lost device is in a primary alarm state; and if the anti-lost device exceeds the secondary fence, the anti-lost device is in a secondary alarm state.
In the in-service use process, the touch display screen that the accessible supervisory equipment was equipped with sets up the numerical value of two-stage rail and the numerical value of two-stage warning distance in advance, and the scope of fence is: and a circular area is formed by taking the set numerical value as the radius and taking the position of the monitoring equipment as the center of a circle. The user can set according to actual need, and its scope is respectively: a primary fence (primary alarm distance) which is usually 5m to 50 m; secondary fencing (secondary alarm distance), typically 50m to 200 m.
In S5, the specific steps are:
if the anti-lost device is in a safe state, the monitoring equipment does not give an alarm;
if the anti-lost device is in a primary alarm state, the monitoring equipment sends out a low-frequency vibration alarm so as to effectively remind monitoring personnel;
if the anti-lost device is in a secondary alarm state, the monitoring equipment gives out sound, flash and high-frequency vibration alarm, so that monitoring personnel are reminded to search as soon as possible, surrounding people are effectively warned, and effective help is provided at the first time.
In S6, the specific steps are:
if the anti-lost device is in a safe state, the alarm module 5 is not triggered through the core processor 1;
if the anti-lost device is in a primary alarm state, the core processor 1 triggers the alarm module 5 to only send out a low-frequency vibration alarm signal, namely the core processor 1 outputs TTL level to drive the vibration alarm module to start low-frequency vibration, so that the monitored personnel are effectively reminded;
if the anti-lost device is in a secondary alarm state, the core processor 1 triggers the alarm module 5 to simultaneously send out sound, flash and high-frequency vibration alarm signals, namely the core processor 1 outputs TTL level to drive the buzzer to sound, drive the LED lamp to flash and drive the vibration alarm module to start high-frequency vibration, so that not only can monitored personnel be effectively reminded, but also surrounding people can be effectively warned, and effective help can be provided at the first time.
In the preferred embodiment of the invention, when the GPS signal is strong, the monitoring device can check the positioning information of the person wearing the anti-lost device (the monitored person) in real time through the touch display screen, can further display the movement track of the person wearing the anti-lost device, and can also perform convenient, fast and effective search through path navigation. When the GPS signal is not good, the monitoring equipment can prompt monitoring personnel to switch to a ranging mode on the touch display screen, so that the monitoring personnel can be guided to quickly and effectively search and track lost personnel in a distance shortening mode.
In summary, the anti-lost device, the anti-lost system and the anti-lost method provided by the invention combine the GPS satellite positioning technology and the UWB ranging technology, and when the GPS signal is strong, the distance calculation and the position monitoring between the monitoring device and the GPS positioning information are completed by using the GPS positioning information, so as to obtain distance information; when the GPS signal is weak (especially in an indoor environment), the UWB ranging technology is used for acquiring the point-to-point distance information between the GPS signal and the monitoring equipment; when the distance information exceeds the electronic fence or the alarm distance, the anti-lost device and the monitoring equipment send out sound, light and vibration alarm signals at the same time, so that the monitoring equipment not only can remind lost personnel with certain self-care capability that the current position of the lost personnel is out of the monitoring range, but also can remind the monitoring personnel to take follow-up searching action in time.
Therefore, compared with the prior art, the anti-lost device, the anti-lost system and the anti-lost method provided by the invention have the following outstanding beneficial effects:
1. the method combines the UWB-based ranging technology and the GPS satellite positioning technology, and effectively overcomes the defect that the traditional single GPS-based anti-lost device cannot effectively acquire positioning information when the GPS signal is weak; especially in indoor environment, when GPS can not work smoothly, can utilize and come accurate measurement distance information based on UWB ranging technique for monitoring personnel can master by monitoring personnel's positional information in real time, has enlarged the application scope of preventing the device of wandering away.
2. The two conditions of primary alarm and secondary alarm are distinguished by setting a secondary alarm strategy, namely setting a secondary alarm distance, and the development condition of the situation of the monitoring personnel is reminded by correspondingly setting different alarm strategies. If the current situation is in a first-level alarm state, the anti-lost device and the monitoring equipment only send out low-frequency vibration; if the current situation is in the second-level alarm state, the anti-lost device and the monitoring equipment emit high-frequency vibration and cooperate with sound alarm and light flicker, so that the emergency degree of the current event of related personnel is effectively reminded, and the classification processing is convenient according to specific requirements.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. The anti-lost device is characterized in that the device is in communication connection with monitoring equipment through a GSM network; comprises the following steps:
a core processor;
the GPS positioning module is connected with the core processor, positions the current position of the core processor through a GPS and transmits positioning information to the core processor;
the GSM module is connected with the core processor and is in communication connection with the monitoring equipment through a GSM network, and the core processor transmits the positioning information to the monitoring equipment through the GSM module;
the UWB ranging module is connected with the core processor and is in communication connection with a UWB ranging module arranged in the monitoring equipment, the point-to-point distance between the UWB ranging module and the UWB ranging module is measured, and the monitoring equipment calculates the distance information;
and the alarm module is connected with the core processor, the monitoring equipment judges the current relative position state of the anti-lost device according to the positioning information or the distance information to generate a state mark word, the state mark word is transmitted to the anti-lost device through a GSM network, and the core processor controls the alarm module to send out a corresponding alarm signal according to the state mark word.
2. The anti-lost device according to claim 1, wherein the UWB ranging module obtains the distance information by transmitting a ranging signal to the UWB ranging module in the monitoring device and receiving an echo signal fed back by the UWB ranging module in the monitoring device, and the monitoring device calculates a point-to-point distance between the two UWB ranging modules according to a time difference between the transmission of the ranging signal and the reception of the echo signal.
3. The anti-loss device of claim 1, wherein the alarm module comprises an audible alarm module, a flashing alarm module and a vibrating alarm module, which are respectively connected with the core processor through circuits.
4. The anti-loss device of claim 1, further comprising:
the storage module is connected with the core processor and used for storing the state flag words, the time information, the positioning information and the distance information;
and the power supply module is respectively connected with the core processor, the GPS positioning module, the UWB ranging module, the GSM module, the alarm module and the storage module and provides working voltage.
5. An anti-loss system, comprising the anti-loss device according to any one of claims 1 to 4, and a monitoring apparatus communicatively connected to the anti-loss device via a GSM network.
6. An anti-loss method implemented by the anti-loss system of claim 6, comprising the steps of:
s1, performing power-on initialization and self-checking on the anti-lost device, wherein the initial state is a safe state;
s2, the core processor wakes up from the sleep mode at intervals of T1 and judges the strength of the current GPS signal; if the GPS signal is strong, continuing S3; if the GPS signal is weak, continuing S4;
s3, acquiring positioning information of the anti-lost device through the GPS positioning module, sending the positioning information to the monitoring equipment through the GSM network, judging the relative position state between the anti-lost device and the monitoring equipment by the monitoring equipment, taking a preset electronic fence as a criterion, comparing to obtain a current state flag word, and continuing to S5;
s4, obtaining distance information between the anti-lost device and the monitoring equipment through a UWB ranging module, meanwhile, obtaining a relative position state in the monitoring equipment through a UWB communication module, taking a preset electronic fence as a criterion by the monitoring equipment, obtaining a current state flag word after comparison, and continuing to S5;
s5, the monitoring device takes corresponding operation according to the current status flag word, if the monitoring device is in the safe state, the monitoring device keeps the current state, and if the monitoring device is in the alarm state, the monitoring device sends out alarms of different levels according to corresponding alarm levels;
s6, the monitoring device sends status flag words, time information, positioning information or distance information to the anti-lost device through the GSM network, the core processor of the anti-lost device judges the status flag words and determines the current state, if the core processor is in a safe state, the core processor continues to maintain the current state and continues to S8; if the alarm state is in the alarm state, controlling the alarm module to send out an alarm signal of a corresponding grade according to the corresponding alarm grade, and continuing S7;
s7, when the monitoring personnel retrieve the personnel wearing the anti-lost device, the monitoring personnel touch a warning releasing button on the anti-lost device, and the core processor detects a warning releasing instruction and restores the state of the anti-lost device to a safe state;
s8, storing the current status flag word, time information, location information, or distance information in the memory, and proceeding to S2.
7. The method according to claim 6, wherein the step of S3 specifically comprises the steps of:
s31, the core processor accesses the GPS positioning module to acquire the longitude, latitude and altitude positioning information of the position of the anti-lost device, and transmits the information to the core processor;
s32, the core processor packages the received positioning information of the anti-lost device together with the current time information according to a communication protocol;
s33, the core processor transmits the packed data to the monitoring equipment through the GSM module;
s34, after receiving the positioning information of the anti-lost device, the monitoring equipment collects the positioning information of the longitude, the latitude and the altitude of the position where the monitoring equipment is located, and calculates the distance information and the relative position state between the monitoring equipment and the anti-lost device;
s35, the monitoring equipment further judges the state of the anti-lost device according to whether the relative position state exceeds the range of a preset primary fence or a preset secondary fence;
wherein, the device of preventing wandering away sets up three kinds of states: a safety state, a primary alarm state and a secondary alarm state, and writing codes representing each state into a state flag word;
if the anti-lost device is positioned in the primary fence, the anti-lost device is in a safe state; if the anti-lost device is positioned between the primary fence and the secondary fence, the anti-lost device is in a primary alarm state; and if the anti-lost device exceeds the secondary fence, the anti-lost device is in a secondary alarm state.
8. The method according to claim 7, wherein the step S4 specifically includes the steps of:
s41, the UWB ranging module sends ranging signals to the UWB ranging module in the monitoring equipment, the point-to-point distance between the anti-lost device and the monitoring equipment is measured, and the monitoring equipment obtains distance information through calculation;
s42, the monitoring equipment judges whether the current position state of the anti-lost device is a safe state, a primary alarm state or a secondary alarm state according to whether the received distance information exceeds the range of a preset primary fence or a secondary fence, and writes a code representing each state into a state flag word;
if the anti-lost device is positioned in the primary fence, the anti-lost device is in a safe state; if the anti-lost device is positioned between the primary fence and the secondary fence, the anti-lost device is in a primary alarm state; and if the anti-lost device exceeds the secondary fence, the anti-lost device is in a secondary alarm state.
9. The method according to claim 8, wherein in S5, the method specifically comprises:
if the anti-lost device is in a safe state, the monitoring equipment does not give an alarm;
if the anti-lost device is in a primary alarm state, the monitoring equipment sends out a low-frequency vibration alarm;
if the anti-lost device is in a secondary alarm state, the monitoring equipment gives out sound, flash and high-frequency vibration alarm.
10. The method according to claim 9, wherein in S6, the method specifically comprises:
if the anti-lost device is in a safe state, the alarm module is not triggered through the core processor;
if the anti-lost device is in a primary alarm state, triggering an alarm module through a core processor to only send out a low-frequency vibration alarm signal;
if the anti-lost device is in a secondary alarm state, the alarm module is triggered by the core processor to simultaneously send out sound, flash and high-frequency vibration alarm signals.
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