CN111050287A - Low-power-consumption radio frequency identification positioning system and method thereof - Google Patents
Low-power-consumption radio frequency identification positioning system and method thereof Download PDFInfo
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- CN111050287A CN111050287A CN201911327673.7A CN201911327673A CN111050287A CN 111050287 A CN111050287 A CN 111050287A CN 201911327673 A CN201911327673 A CN 201911327673A CN 111050287 A CN111050287 A CN 111050287A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/029—Location-based management or tracking services
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
- G06K17/0029—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device the arrangement being specially adapted for wireless interrogation of grouped or bundled articles tagged with wireless record carriers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/07758—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card arrangements for adhering the record carrier to further objects or living beings, functioning as an identification tag
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/33—Services specially adapted for particular environments, situations or purposes for indoor environments, e.g. buildings
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a low-power-consumption radio frequency identification positioning system and a method thereof, which reduce the power consumption of the whole system to the maximum extent through the ingenious design of a piezoelectric sensor technology and a low-power-consumption control circuit, the system can work stably and reliably for a long time by adopting a battery, the information transmission between the system and server background equipment is realized through a wireless communication of a WIFI module, and finally the installation of the system equipment achieves the aim of wireless. The method is particularly suitable for wireless deployment of decorated indoor places, does not need to decorate the decorated indoor environment again, and reduces the reconstruction cost and the deployment period to the maximum extent. The piezoelectric sensor device is deployed at a key position needing positioning indoors, and the specific position where the piezoelectric sensor device is located can be determined by combining the processing system of the patent background management platform.
Description
Technical Field
The invention relates to the technical field of radio frequency positioning, in particular to a low-power-consumption radio frequency identification positioning system and a method thereof.
Background
Indoor is the place with the most close relationship of human life. A large number of human application requirements are associated with indoor location services, such as the location of indoor items, the location of personnel, and the like.
Currently, the mature indoor positioning technologies mainly include bluetooth, WiFi/WLAN, Radio Frequency Identification (RFID), Ultra Wideband (UWB), and the like. The Bluetooth and WLAN technologies determine the distance based on the value of Received Signal Strength Indicator (RSSI) of electromagnetic waves and calculate the position according to the distance to a plurality of base stations, so that the positioning purpose is achieved. The ultra-wideband (UWB) technology judges the distance based on the time-of-flight ranging method of electromagnetic waves, and calculates the position through the distances of a plurality of base stations to achieve the purpose of positioning. The radio frequency identification positioning technology has become one of solutions for indoor positioning technology due to its advantages of non-line-of-sight, low cost, low power consumption, capability of quickly determining the position of a target, and the like. Therefore, in order to position the position information of the personnel indoors in real time, the radio frequency identification positioning technology is adopted, so that the personnel indoors can be identified and tracked automatically and in real time more accurately, and the safety of the personnel is ensured. However, when the radio frequency identification positioning technology system is laid indoors, a power supply system and a line communicated with a server need to be embedded in a specified position, the cost is high, and particularly, the construction and the reconstruction of an old nursing home are difficult and serious.
Disclosure of Invention
The invention aims to provide a low-power-consumption radio frequency identification positioning system and a method thereof.
The technical scheme adopted by the invention is as follows:
a low-power-consumption radio frequency identification positioning system comprises an RFID electronic tag, a piezoelectric identification device and a positioning server, wherein the RFID electronic tag is worn on a person to be positioned, the piezoelectric identification device is laid at a key position needing positioning in a room and comprises piezoelectric sensing equipment and a low-power-consumption radio frequency identification reader-writer, the piezoelectric sensing equipment is connected with the low-power-consumption radio frequency identification reader-writer, the low-power-consumption radio frequency identification reader-writer is provided with a WiFi communication circuit and a low-power-consumption control circuit, the low-power-consumption radio frequency identification reader-writer is in wireless communication with the positioning server through the WiFi communication circuit and is in a low-power-consumption standby state constantly, the piezoelectric sensing equipment is used for sensing pressure and generating an electric signal to activate the low-power-consumption radio frequency identification reader-writer to work, and the low-power-consumption radio frequency identification reader-writer is, and the positioning server receives the information and records the position information of the corresponding person to be positioned.
Further, the positioning server prestores the device ID of the low-power-consumption radio frequency identification reader-writer and the corresponding installation position of the device ID.
Further, the low-power-consumption radio frequency identification reader-writer sends the tag information to the positioning server together with the timestamp and the device ID of the low-power-consumption radio frequency identification reader-writer. The positioning server records the position information by adopting a time sequence.
Furthermore, the low-power-consumption radio frequency identification reader-writer comprises a WiFi communication circuit, a low-power-consumption control circuit, a radio frequency transceiver and a main processor, the piezoelectric sensor device is respectively connected with the main processor and the low-power-consumption control circuit, a power supply is connected to the device through the low-power-consumption control circuit, the low-power-consumption control circuit controls the power supply to supply power to the WiFi communication circuit, the radio frequency transceiver and the main processor, the radio frequency transceiver sends radio frequency signals to the electronic tag and receives feedback signals of the electronic tag under the control of the main processor, and the main processor is in wireless communication connection with the positioning server through the.
Further, the RFID tag is worn on the shoe of the person to be positioned.
The piezoelectric sensing device comprises a piezoelectric sensor, a charge amplifier and a slave processor, wherein the piezoelectric sensor is connected with the slave processor through the charge amplifier, the output end of the slave processor is connected with a low-power-consumption control circuit of the low-power-consumption radio frequency identification reader-writer, the piezoelectric sensor generates a weak current signal, the charge amplifier is used for amplifying the weak current signal, and the slave processor outputs an activation signal based on the weak current signal to control the low-power-consumption control circuit to turn on a power supply to activate the low-power-consumption radio frequency identification reader-writer to work.
The pressure indicating circuit comprises a double-voltage comparator and pressure indicating lamps, the output end of the charge amplifier is connected with the input end of the double-voltage comparator, the double-voltage comparator offsets the device deviation of the piezoelectric sensor and the charge amplifier, the output end of the double-voltage comparator is connected with one end of the pressure indicating lamps, the other end of the pressure indicating lamps is connected with a light driving output IO port of the slave processor, and the slave processor drives and lights the pressure indicating lamps with the corresponding number of intensities based on the intensity of the current signal of the piezoelectric sensor.
Furthermore, the piezoelectric sensing device is provided with 5 piezoelectric sensors, 5 corresponding charge amplifiers and 5 pressure indicating circuits, the 5 piezoelectric sensors are sequentially arranged along the trampling direction, each piezoelectric sensor is connected with one charge amplifier, each charge amplifier divides a voltage signal into two paths, one path of the voltage signal is sent to the pressure indicating circuit, the pressure indicating circuit comprises an LM393 double-voltage comparator and a luminous LED lamp, one path of the voltage signal is connected to the input end of the double-voltage comparator, the device deviation of the piezoelectric sensors and the charge amplifiers is counteracted through the double-voltage comparator, the output end of the double-voltage comparator is connected with one end of the luminous LED lamp, the other end of the luminous LED lamp is connected with one output IO port of the slave processor, the 5 piezoelectric sensors respectively correspond to 5 signal input ports and 5 light driving output IO ports of the slave processor, and the slave processor judges and compares the walking direction of a locator according to the difference of the time of receiving the 5 paths of piezoelectric sensor electric signals to And judging the path direction of the person.
Furthermore, piezoelectric sensor equipment includes the pedal, the blank pressing angle all around of pedal, sensor circuit board and signal wiring, the pedal adopts PVC plastics rubber material shaping, the advantage that has antiskid, waterproof, firm, anticorrosion, pedal terrain clearance 15 millimeters, installation piezoelectric sensor circuit board and signal wiring in the middle of the bottom of pedal, in order to prevent that the positioning personnel especially old man from walking when neglecting easily that equipment thickness causes and falling down, the pedal sets up blank pressing and angle pressing all around and carries out the transition of main part and road plane difference in height.
Furthermore, the power supply is a built-in battery, the low-power-consumption radio frequency identification reader adopts an M100 type RFID chip as a main processor, and the auxiliary processor adopts an ESP32 enhanced transparent transmission chip.
A low-power consumption radio frequency identification positioning method comprises the following steps:
step 5, the low-power-consumption radio frequency identification reader sends the label information together with the timestamp and the equipment ID of the low-power-consumption radio frequency identification reader to a positioning server through WiFi;
step 6, the positioning server receives the information, obtains the position of the low-power-consumption radio frequency identification reader-writer according to the equipment ID, and records the position to form a piece of position information;
and 7, the positioning server acquires the position information corresponding to the same electronic tag according to the time sequence to form the indoor flowing condition of the person to be positioned.
By adopting the technical scheme, the WiFi wireless communication mode is adopted on the basis of the radio frequency identification positioning technology, the communication line is not required to be laid, the piezoelectric sensing technology is adopted to identify the radio frequency tag, the low-power-consumption technology is adopted to process the radio frequency identification reader-writer, and the power supply line is not required to be laid, so that the construction cost is greatly reduced.
The invention has the following advantages:
1. the product can be miniaturized due to high integration level, small volume and low power consumption;
2. the reader-writer of the radio frequency identification positioning technology does not need to lay a power supply system and a line communicated with the server, has low construction cost, and can realize 'installation anywhere and laying anywhere' according to network planning;
3. according to the system, the RFID tag is embedded in the shoes worn by positioning personnel in daily life, so that the portability and the wear resistance of the shoes are ensured, and the life of a user is not influenced;
4. the system collects the label information through the RFID reader-writer so as to determine the position of the positioning personnel, the positioning precision is high, the collected position information is subjected to data preprocessing, and the redundancy is removed to obtain the characteristic attribute of the daily life of the positioning personnel.
Drawings
The invention is described in further detail below with reference to the accompanying drawings and the detailed description;
FIG. 1 is a schematic diagram of a low power consumption RFID positioning system according to the present invention;
FIG. 2 is a schematic diagram of the circuit of the low power consumption RFID reader of the present invention;
FIG. 3 is a schematic circuit diagram of a piezoelectric sensing device of the present invention;
FIG. 4 is a schematic circuit diagram of another preferred piezoelectric sensing device of the present invention;
FIG. 5 is a schematic structural view of a piezoelectric sensing device of the present invention;
FIG. 6 is a schematic view of a cross-sectional edge pressing configuration of a piezoelectric sensing device according to the present invention;
fig. 7 is a schematic view of a state of use of the piezoelectric sensing device of the present invention.
Detailed Description
As shown in figures 1 to 7, the invention discloses a low-power consumption radio frequency identification positioning system, which comprises an RFID electronic tag, a piezoelectric identification device and a positioning server, wherein the RFID electronic tag is worn on a person to be positioned, the piezoelectric identification device is laid at a key position needing positioning indoors, the piezoelectric identification device comprises a piezoelectric sensing device and a low-power consumption radio frequency identification reader-writer, the piezoelectric sensing device is connected with the low-power consumption radio frequency identification reader-writer, the low-power consumption radio frequency identification reader-writer is provided with a WiFi communication circuit and a low-power consumption control circuit, the low-power consumption radio frequency identification reader-writer is in wireless communication with the positioning server through the WiFi communication circuit, the low-power consumption radio frequency identification reader-writer is in a low-power consumption standby state at all times, the piezoelectric sensing device is used for sensing pressure and generating an electric signal to activate the low-power consumption radio frequency identification reader-writer to work, the low-power consumption, and the positioning server receives the information and records the position information of the corresponding person to be positioned.
Further, the positioning server prestores the device ID of the low-power-consumption radio frequency identification reader-writer and the corresponding installation position of the device ID.
Further, the low-power-consumption radio frequency identification reader-writer sends the tag information to the positioning server together with the timestamp and the device ID of the low-power-consumption radio frequency identification reader-writer. The positioning server records the position information by adopting a time sequence.
Furthermore, the low-power-consumption radio frequency identification reader-writer comprises a WiFi communication circuit, a low-power-consumption control circuit, a radio frequency transceiver and a main processor, the piezoelectric sensor device is respectively connected with the main processor and the low-power-consumption control circuit, a power supply is connected to the device through the low-power-consumption control circuit, the low-power-consumption control circuit controls the power supply to supply power to the WiFi communication circuit, the radio frequency transceiver and the main processor, the radio frequency transceiver sends radio frequency signals to the electronic tag and receives feedback signals of the electronic tag under the control of the main processor, and the main processor is in wireless communication connection with the positioning server through the.
Further, the RFID tag is worn on the shoe of the person to be positioned.
The piezoelectric sensing device comprises a piezoelectric sensor, a charge amplifier and a slave processor, wherein the piezoelectric sensor is connected with the slave processor through the charge amplifier, the output end of the slave processor is connected with a low-power-consumption control circuit of the low-power-consumption radio frequency identification reader-writer, the piezoelectric sensor generates a weak current signal, the charge amplifier is used for amplifying the weak current signal, and the slave processor outputs an activation signal based on the weak current signal to control the low-power-consumption control circuit to turn on a power supply to activate the low-power-consumption radio frequency identification reader-writer to work.
Furthermore, the output end of the slave processor is connected with a pressure indicator lamp, and the slave processor drives and lights the pressure indicator lamp with corresponding intensity based on the intensity of the current signal of the piezoelectric sensor.
Further, as shown in fig. 5 to 7, the piezoelectric sensor device includes a pedal 1, a pressing angle 3 for pressing the edge around the pedal 1, a sensor circuit board and signal wiring thereof, the pedal 1 is molded by PVC plastic rubber, and has the advantages of skid resistance, water resistance, firmness and corrosion resistance, the height of the pedal 1 above the ground is 15 mm, the piezoelectric sensor circuit board and the signal wiring are installed in the middle of the bottom of the pedal 1, and the signal wiring is connected to the power supply device 4. In order to prevent positioning personnel, particularly old people, from easily overlooking equipment thickness to cause falling when walking, the periphery of the pedal 1 is provided with a pressing edge and a pressing angle to carry out transition of height difference between a main body and a road plane.
Furthermore, the power supply is a built-in battery, the low-power-consumption radio frequency identification reader adopts an M100 type RFID chip as a main processor, and the auxiliary processor adopts an ESP32 enhanced transparent transmission chip.
The MagicRF M100 card reader chip has high integration level and has the following remarkable characteristics:
1. supports ISO18000-6C and EPC Class-1 Generation-2 standards;
2. the frequency coverage is wide: 840 MHz-960 MHz;
3. the power consumption is low: the current is less than 10uA in the low power consumption mode, 8mA in the idle mode and 80mA in the full power mode;
4. a fully integrated radio frequency transceiver, a digital modem;
5. an integrated low noise VCO and loop filter;
6. an integrated enhanced 8bit 8051MCU,256 bytes of internal memory, 16K bytes of program RAM and 8K bytes of data RAM.
WIFI chips are integrated in MCU chips of the ESP32, and the WI-FI function can be provided through SPI/SDIO or I2C/UART interfaces. ESP32 has stable performance, and the integrated self-calibration circuit realizes dynamic voltage adjustment, can eliminate the defects of external circuits and adapt to the change of external conditions. ESP32 has high-level low-power performance in the industry, including fine resolution clock gating, power-saving modes, and dynamic voltage regulation.
A low-power consumption radio frequency identification positioning method comprises the following steps:
step 5, the low-power-consumption radio frequency identification reader sends the label information together with the timestamp and the equipment ID of the low-power-consumption radio frequency identification reader to a positioning server through WiFi;
step 6, the positioning server receives the information, obtains the position of the low-power-consumption radio frequency identification reader-writer according to the equipment ID, and records the position to form a piece of position information;
and 7, the positioning server acquires the position information corresponding to the same electronic tag according to the time sequence to form the indoor flowing condition of the person to be positioned.
The following is a detailed description of the specific principles of the present invention:
the invention adopts an M100 type RFID chip as a main processor. The M100 type radio frequency identification chip supports the ISO18000-6C standard, and is a neutral-performance RFID chip with high integration, low power consumption and low cost. As shown in fig. 1, the novel low-power-consumption radio frequency identification positioning system of the present invention is mainly divided into three parts: RFID electronic tags, piezoelectricity recognition device and location server. The RFID electronic tag meets the ISO/IEC 18000-6C standard, the tag is worn in a shoe, and a piezoelectric identification device is laid at a key position needing to be positioned indoors, wherein the piezoelectric identification device comprises piezoelectric sensing equipment and a low-power-consumption radio frequency identification reader-writer. The piezoelectric sensing equipment comprises a piezoelectric sensor, a charge amplifier, a slave processor and a pressure indicator lamp, wherein the charge amplifier and the slave processor form a piezoelectric sensing module, and the piezoelectric sensing equipment is connected with the low-power-consumption radio frequency identification reader-writer. When a positioning person walks through the piezoelectric sensor device, the person shoes tread the piezoelectric sensors, the piezoelectric sensing modules receive pressure signals, the pressure indicator lamps are turned on, the signals are transmitted to the slave processor, the slave processor sends instructions to control the low-power-consumption control circuit to work, the M100 type RFID chip power supply system is started, the RFID chip reads identity information of an electronic tag, the information is transmitted to the positioning server through the wireless WiFi device, the position information of the person is recorded by the positioning server, the flow condition of the person in a room is formed through positioning calculation of the positioning server, and the position condition and the movement track of the person can be further depicted on an indoor 3D map.
Fig. 2 shows a core circuit of a low-power consumption rfid reader, and the working principle and circuit characteristics are briefly described as follows:
the low-power consumption radio frequency identification reader-writer provides 485, 232, USB and I2C external expansion interfaces, wherein the M100 type RFID equipment identification chip is used as a main processor and is connected with a WiFi communication circuit through a TCP/IP protocol interface, and wirelessly communicates with a gateway connected with a positioning server through the protocol standard of IEEE 802.11n to transmit data to the positioning server. The low-power-consumption radio frequency identification reader-writer comprises a WiFi communication circuit, a low-power-consumption control circuit and a radio frequency transceiver. When a slave processor in the piezoelectric sensing module transmits a pressure trampling signal to the M100 type radio frequency identification chip through a UART serial port, and simultaneously wakes up a low-power consumption control power supply, the power supply system sequentially supplies power to the M100 type radio frequency identification chip, the radio frequency transceiver and the WiFi communication circuit. After receiving a 'step on' instruction sent by a piezoelectric sensing module, an M100 radio frequency identification chip sends a UHF frequency band 'send identity information' radio frequency modulation signal to a radio frequency transceiver, the radio frequency modulation signal is subjected to power amplification through a radio frequency power amplifier, the signal is subjected to band-pass filtering through a filter after being amplified, an effective in-band power signal is left, then the signal is subjected to two-way division through a directional coupler and a 90-degree 3dB bridge, and finally the signal is sent to an antenna to send the radio frequency signal. After the antenna wearing the electronic tag receives the radio frequency signal of the 'sending identity information' and absorbs the energy of the radio frequency signal as the power supply of the 'response identity information', the electronic tag sends the 'response identity information'. At the moment, the antenna of the low-power-consumption radio frequency identification reader-writer simultaneously receives radio frequency signals of 'response identity information', the radio frequency signals are combined through a 90-degree 3dB bridge, the signals are coupled to a low-noise amplifier of another channel through a directional coupler to be amplified, the amplified signals are differentiated through a radio frequency balun, and after common-mode distortion in a link is reduced, the 'response identity information' signals are sent to an M100 type RFID chip. The low-power-consumption radio frequency identification reader-writer packages the received 'response identity information' into a signal of a TCP/IP protocol standard after processing and packaging, transmits the information to a positioning server through wireless WiFi equipment, records the position information of personnel through the positioning server, performs positioning calculation through the positioning server to form the flow condition of the indoor personnel, and can further draw the position condition and the movement track of the personnel on an indoor 3D map.
As shown in fig. 3, the operation principle and circuit characteristics of the piezoelectric sensing device are briefly described as follows:
the piezoelectric sensing device is mainly divided into three parts: piezoelectric sensor, slave processor circuit portion, pressure indicating circuit. Laying piezoelectric sensor equipment in the indoor key position that needs the location, when the positioning personnel trample on the equipment, piezoelectric sensor produces weak current signal, and principle formula U = Q/C according to piezoelectric sensor, wherein Q is the electric quantity, and C is piezoelectric sensor's equivalent capacitance value, and U is induced electromotive force. The weak current signal is amplified by a charge amplifier to generate a continuous analog voltage signal, and the voltage signal is divided into two paths: one path is sent to a pressure indicating circuit, the pressure indicating circuit comprises an LM393 double-voltage comparator and a luminous LED lamp, the input end of the double-voltage comparator is connected with the other path, the device deviation of a piezoelectric sensor and a charge amplifier is counteracted through the double-voltage comparator, the output end of the double-voltage comparator is connected with one end of the luminous LED lamp, and the other end of the luminous LED lamp is connected with a light driving output IO port of a slave processor.
In addition, one path of analog signals are sent to an ADC conversion port of an ESP32 type slave processor, after the slave processor receives digital trampling signals, an instruction is sent to require a low-power-consumption control circuit to turn on a power supply to sequentially supply power to an M100 type RFID chip, a radio frequency transceiver and a WiFi communication circuit, so that the power supply expense of the whole system is saved to the maximum extent, meanwhile, the power consumption of the system circuit is optimized by means of combination of software and hardware, and the system can work safely and reliably for a long time by using a battery.
Further, as shown in fig. 4, as a modified structure of the piezoelectric sensing device, the piezoelectric sensing device has 5 piezoelectric sensors and corresponding 5 charge amplifiers and 5 pressure indicating circuits. Each circuit of piezoelectric sensor is connected with a charge amplifier, each charge amplifier divides a voltage signal into two circuits, one circuit is sent to a pressure indicating circuit, the pressure indicating circuit comprises an LM393 double-voltage comparator and a luminous LED lamp, the other circuit is connected with the input end of the double-voltage comparator, the device deviation of the piezoelectric sensor and the charge amplifier is offset through the double-voltage comparator, the output end of the double-voltage comparator is connected with one end of the luminous LED lamp, and the other end of the luminous LED lamp is connected with an output IO port of a slave processor. The 5-path piezoelectric sensors respectively correspond to 5 signal input ports and 5 light driving output IO ports of the slave processor.
5 horizontal installation piezoelectric sensor equipment of group piezoelectric sensor tramples the part to respectively the serial number is: number 1, number 2, number 3, number 4, number 5. Due to the walking posture of a general person: when stepping one step, the posture of the sole lands on the ground according to the sequence of heel, arch and tiptoe, and the tiptoe of the person faces to the walking direction. According to the principle, when the sole of a person treads the treading part of the piezoelectric sensor device, the person treads the treading part according to the sequence of the heel, the arch and the tiptoe, then 5 groups of sensors trigger the piezoelectric sensors according to the sequence of the time sequence and send piezoelectric signals to the slave processor, and the slave processor judges and compares the walking direction of a positioned person based on the difference of the time when the slave processor receives the electric signals correspondingly and judges the path direction of the person.
As shown in fig. 5 to 7, the piezoelectric sensor of the present invention has a schematic structural diagram, and a main body of the piezoelectric sensor device is divided into four parts: PVC crushed aggregates rubber main part, blank pressing angle 3 all around, sensor circuit board and signal are walked the line. Wherein trample the main part and adopt PVC plastics rubber material, have antiskid, waterproof, firm, anticorrosive advantage. The main body of the pedal 1 is 15 mm away from the ground, a piezoelectric sensor circuit board and signal wiring are arranged in the middle, and in order to prevent positioning personnel, particularly old people, from easily neglecting the thickness of equipment when walking to cause falling down, blank pressing and corner pressing are additionally arranged around the main body to carry out transition of height difference between the main body and a road plane.
By adopting the technical scheme, the WiFi wireless communication mode is adopted on the basis of the radio frequency identification positioning technology, the communication line is not required to be laid, the piezoelectric sensing technology is adopted to identify the radio frequency tag, the low-power-consumption technology is adopted to process the radio frequency identification reader-writer, and the power supply line is not required to be laid, so that the construction cost is greatly reduced.
The invention has the following advantages:
1. the product can be miniaturized due to high integration level, small volume and low power consumption;
2. the reader-writer of the radio frequency identification positioning technology does not need to lay a power supply system and a line communicated with the server, has low construction cost, and can realize 'installation anywhere and laying anywhere' according to network planning;
3. according to the system, the RFID tag is embedded in the shoes worn by positioning personnel in daily life, so that the portability and the wear resistance of the shoes are ensured, and the life of a user is not influenced;
4. the system collects the label information through the RFID reader-writer so as to determine the position of the positioning personnel, the positioning precision is high, the collected position information is subjected to data preprocessing, and the redundancy is removed to obtain the characteristic attribute of the daily life of the positioning personnel.
The invention can be applied to indoor personnel positioning and personnel motion trail description in various scenes, and is particularly suitable for places such as nursing homes, kindergartens and the like needing intensive care of nursing personnel.
Claims (10)
1. A low-power consumption radio frequency identification positioning system is characterized in that: which comprises an RFID electronic tag and a radio frequency identification device, the piezoelectric identification device is laid at a key position needing to be positioned indoors and comprises piezoelectric sensing equipment and a low-power-consumption radio frequency identification reader-writer, the piezoelectric sensing equipment is connected with the low-power-consumption radio frequency identification reader-writer, the low-power-consumption radio frequency identification reader-writer is provided with a WiFi communication circuit and a low-power-consumption control circuit, the low-power-consumption radio frequency identification reader-writer is in wireless communication with the positioning server through the WiFi communication circuit, the low-power-consumption radio frequency identification reader-writer is in a low-power-consumption standby state constantly, the piezoelectric sensing equipment is used for sensing pressure and generating electric signals to activate the low-power-consumption radio frequency identification reader-writer to work, the low-power-consumption radio frequency identification reader-writer is used for reading label information in the RFID electronic label and sending the label information to the positioning server, and the positioning server receives the information and records the position.
2. A low power consumption radio frequency identification location system according to claim 1, wherein: the low-power-consumption radio frequency identification reader-writer sends the label information to the positioning server together with the timestamp and the equipment ID of the low-power-consumption radio frequency identification reader-writer, the equipment ID of the low-power-consumption radio frequency identification reader-writer and the corresponding installation position are prestored in the positioning server, and the positioning server records the position information by adopting a time sequence.
3. A low power consumption radio frequency identification location system according to claim 1, wherein: the low-power-consumption radio frequency identification reader-writer comprises a WiFi communication circuit, a low-power-consumption control circuit, a radio frequency transceiver and a main processor, wherein the piezoelectric sensor device is respectively connected with the main processor and the low-power-consumption control circuit, a power supply is accessed to the device through the low-power-consumption control circuit, the low-power-consumption control circuit controls the power supply to supply power to the WiFi communication circuit, the radio frequency transceiver and the main processor, the radio frequency transceiver sends radio frequency signals to an electronic tag and receives feedback signals of the electronic tag under the control of the main processor, and the main processor is in wireless communication connection with a positioning.
4. A low power consumption radio frequency identification location system according to claim 1, wherein: the piezoelectric sensing equipment comprises a piezoelectric sensor, a charge amplifier and a slave processor, wherein the piezoelectric sensor is connected with the slave processor through the charge amplifier, the output end of the slave processor is connected with a low-power consumption control circuit of the low-power consumption radio frequency identification reader-writer, the piezoelectric sensor generates a weak current signal, the charge amplifier is used for amplifying the weak current signal, the slave processor outputs an activation signal based on the weak current signal, and the activation signal drives the low-power consumption control circuit to turn on a power supply to activate the low-power consumption radio frequency identification reader-writer to work.
5. A low power consumption radio frequency identification location system according to claim 4, wherein: the pressure indicating circuit comprises a double-voltage comparator and pressure indicating lamps, the output end of the charge amplifier is connected with the input end of the double-voltage comparator, the double-voltage comparator offsets the device deviation of the piezoelectric sensor and the charge amplifier, the output end of the double-voltage comparator is connected with one end of the pressure indicating lamps, the other end of the pressure indicating lamps is connected with a light driving output IO port of the slave processor, and the slave processor drives and lights the pressure indicating lamps with corresponding intensity numbers based on the intensity of current signals of the piezoelectric sensor.
6. A low power consumption radio frequency identification location system according to claim 5, wherein: the piezoelectric sensing equipment is provided with 5 piezoelectric sensors, 5 corresponding charge amplifiers and 5 pressure indicating circuits, wherein the 5 piezoelectric sensors are sequentially arranged along a trampling direction, each piezoelectric sensor is connected with one charge amplifier, each charge amplifier divides a voltage signal into two paths, one path of the voltage signal is sent to the pressure indicating circuit, the pressure indicating circuit comprises an LM393 double-voltage comparator and a luminous LED lamp, one path of the voltage signal is connected with the input end of the double-voltage comparator, the device deviation of the piezoelectric sensors and the charge amplifiers is counteracted through the double-voltage comparator, the output end of the double-voltage comparator is connected with one end of the luminous LED lamp, the other end of the luminous LED lamp is connected with one output IO port of the slave processor, the 5 piezoelectric sensors respectively correspond to 5 signal input ports of the slave processor and 5 light driving output IO ports, and the walking direction of a locator is judged and compared according to the difference of the time when the slave processor receives the 5 paths of electric signals of the The direction of the path.
7. A low power consumption radio frequency identification location system according to claim 1, wherein: the piezoelectric sensor equipment comprises a pedal, the pedal is made of PVC plastic rubber, the ground clearance of the pedal is 15 mm, a piezoelectric sensor circuit board and signal wiring lines are installed in the middle of the bottom of the pedal, and blank pressing and corner pressing are arranged on the periphery of the pedal to perform transition of height difference between a main body and a road plane.
8. A low power consumption radio frequency identification location system according to claim 1, wherein: the power supply is a built-in battery, the low-power-consumption radio frequency identification reader adopts an M100 type RFID chip as a main processor, and the slave processor adopts an ESP32 enhanced transparent transmission chip.
9. A low power consumption rfid positioning method, using a low power consumption rfid positioning system of any of claims 1 to 8, characterized in that: the method comprises the following steps:
step 1, laying a piezoelectric identification device at an indoor key position, and wearing an electronic tag on a person to be positioned;
step 2, when a person to be positioned tramples the piezoelectric identification device, the piezoelectric identification device induces and generates a trigger signal to drive the low-power-consumption control circuit to turn on a power supply to activate the low-power-consumption radio frequency identification reader-writer to work;
step 3, the low-power-consumption radio frequency identification reader-writer sends a radio frequency signal of 'sending identity information' to the electronic tag through the radio frequency transceiver;
step 4, the electronic tag absorbs the radio frequency signal of 'sending identity information' as a power supply and feeds back the tag information as response identity information to the low-power-consumption radio frequency identification reader-writer;
step 5, the low-power-consumption radio frequency identification reader sends the label information together with the timestamp and the equipment ID of the low-power-consumption radio frequency identification reader to a positioning server through WiFi;
step 6, the positioning server receives the information, obtains the position of the low-power-consumption radio frequency identification reader-writer according to the equipment ID, and records the position to form a piece of position information;
and 7, the positioning server acquires the position information corresponding to the same electronic tag according to the time sequence to form the indoor flowing condition of the person to be positioned.
10. A low power consumption rfid location method according to claim 9, wherein: when the piezoelectric identification device adopts a piezoelectric sensing device with 5 piezoelectric sensors, corresponding 5 charge amplifiers and 5 pressure indicating circuits, the slave processor judges and compares the walking direction of the positioning personnel according to the difference of the time of receiving 5 piezoelectric sensor electric signals so as to judge the path direction of the personnel, and then sends the walking direction and the path direction of the personnel to the positioning server together in the follow-up process.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112017072A (en) * | 2020-08-26 | 2020-12-01 | 阳光电源（上海）有限公司 | Photovoltaic system, positioning method of devices in string, MLPE device and sequencing method of MLPE device |
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| CN112017072B (en) * | 2020-08-26 | 2024-05-14 | 阳光电源（上海）有限公司 | Photovoltaic system, positioning method of equipment in string, MLPE equipment and sequencing method of MLPE equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112017072A (en) * | 2020-08-26 | 2020-12-01 | 阳光电源（上海）有限公司 | Photovoltaic system, positioning method of devices in string, MLPE device and sequencing method of MLPE device |
| CN112017072B (en) * | 2020-08-26 | 2024-05-14 | 阳光电源（上海）有限公司 | Photovoltaic system, positioning method of equipment in string, MLPE equipment and sequencing method of MLPE equipment |
| CN112098985A (en) * | 2020-09-09 | 2020-12-18 | 杭州中芯微电子有限公司 | UWB positioning method based on millimeter wave detection |
| CN112098985B (en) * | 2020-09-09 | 2024-04-12 | 杭州中芯微电子有限公司 | UWB positioning method based on millimeter wave detection |
| CN116367090A (en) * | 2023-03-31 | 2023-06-30 | 广东爆破工程有限公司 | Quick response management system applied to non-coal mine tight accidents |
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