CN110365358B - RFID (radio frequency identification) super positioning exciter - Google Patents
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- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
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Abstract
The invention discloses an RFID super positioning exciter, which comprises an ARM main control module, a 2.4G transceiving polling module, a 125K signal program-controlled power supply adjusting module, a 125K signal synthesizing and amplifying module and a signal transmitting module, wherein the ARM main control module receives polling data in real time through the 2.4G transceiving polling module and synthesizes and amplifies the data by using the 125K signal synthesizing and amplifying module, the signal transmitting module transmits a wireless signal, the 2.4G transceiving polling module is used for realizing the polling transceiving of 2.4G signals, the 125K signal program-controlled power supply adjusting module is used for adjusting the height of power supply voltage, the invention is scientific and reasonable, is safe and convenient to use, realizes the time slot control of the 2.4G signals by using the 2.4G transceiving polling module, avoids the problem of mutual collision among the positioning exciters, and the 125K signal program-controlled power supply adjusting module is used for adjusting the height of the power supply voltage, the stepless regulation of the wireless signal power is realized.
Description
Technical Field
The invention relates to the technical field of exciters, in particular to an RFID (radio frequency identification) super positioning exciter.
Background
In the related technology visible in the market at present, an excitation mode of a 125KHz positioning base station is a resistance voltage division type voltage excitation mode, the efficiency is low, stepless accurate adjustment cannot be realized, the 125K positioning function characteristic is poor, field debugging is troublesome, the positioning range and the acting distance of each 125KHZ positioning base station are limited, for example, (3.5 m radius) causes that the coverage requirement of positioning triggering is difficult to meet, particularly in an irregular open field, the layout of the positioning base stations is a troublesome problem, the number of the required positioning base stations is large, the positioning coverage is crossed and overlapped due to irregular field, mutual interference is caused, the positioning distance cannot be accurately adjusted, the situations of positioning interference, positioning information loss and the like can be caused in a specific application scene, the non-positioning or wrong positioning state can be caused, and the time slot control of triggering excitation is complex, the invention adopts 2.4GHZ time slot control, effectively solves the problem of positioning exciter collision, and therefore, people urgently need an RFID super positioning exciter to solve the problem.
Disclosure of Invention
The invention aims to provide an RFID super positioning exciter, which solves the problems that the efficiency provided by the prior art is low, stepless accurate adjustment cannot be realized, field debugging is troublesome, the positioning range and the acting distance are limited, so that the coverage requirement of positioning triggering is difficult to meet, especially in irregular open fields, the number of required positioning base stations is large, mutual interference exists, the positioning distance cannot be accurately adjusted, and positioning interference and positioning information loss can be caused in a specific application scene.
In order to achieve the purpose, the invention provides the following technical scheme: an RFID super positioning exciter comprises an ARM main control module, a 2.4G transceiving polling module, a 125K signal program control power supply adjusting module, a 125K signal synthesizing and amplifying module and a signal transmitting module;
the 2.4G transceiving polling module is electrically connected with the ARM main control module, the output end of the ARM main control module is respectively electrically connected with the input ends of the 125K signal programmable power supply adjusting module and the 125K signal synthesizing and amplifying module, and the output ends of the 125K signal programmable power supply adjusting module and the 125K signal synthesizing and amplifying module are both electrically connected with the input end of the signal transmitting module;
the ARM main control module receives polling data in real time through the 2.4G receiving and dispatching polling module, when a current address signal is received, the ARM main control module synthesizes and amplifies the data by using the 125K signal synthesis and amplification module according to a data format, the signal transmitting module transmits a wireless signal, the 2.4G receiving and dispatching polling module is used for realizing polling and dispatching of the 2.4G signal, the 2.4G receiving and dispatching polling module is used for realizing time slot control of the 2.4G signal, the problem of mutual collision among positioning exciters is avoided, and the 125K signal programmable power supply adjustment module is used for adjusting the power supply voltage and realizing the stepless adjustment of the power of the wireless signal.
According to the technical scheme, the 2.4G transceiving polling module comprises a host and a plurality of slave machines, the host transmits 125K signals and simultaneously starts a 2.4G command management slave machine, the slave machines sequentially transmit 125K signals in a polling mode, the slave machines receive the 2.4G command transmitted by the host and transmit 125K signals, wireless circulation of the 125K signals can be achieved, the problem of co-frequency interference of 125K triggers can be effectively solved, equipment installation is simple and rapid, and construction efficiency is greatly improved.
According to the technical scheme, the ARM main control module mainly comprises an STM32F051C8 chip, and the STM32F051C8 chip is used for controlling the whole super positioning exciter.
According to the technical scheme, the 125K signal program control power supply adjusting module comprises a MAX5128 digital potentiometer and a 29302WU chip, the ARM main control module adjusts the internal resistance value of the MAX5128 digital potentiometer in a 2-wire communication mode, the MAX5128 digital potentiometer, a resistor R8 and a resistor R10 form a voltage dividing circuit to control an ADJ pin of a 29302WU chip, the output voltage of the 29302WU chip is changed, and the power transmitted by 125K wireless signals is changed.
According to the technical scheme, the 125K signal synthesis and amplification module comprises a TC4422MOS driver and a push-pull MOS DMC3018 chip, data received by the ARM main control module is synthesized with standard 125K square waves, the synthesized data are reversely amplified through the TC4422MOS driver and the push-pull MOS DMC3018 chip, and power supplies of the TC4422MOS driver and the push-pull MOS DMC3018 chip are dynamically adjusted through the 125K signal program control power supply adjustment module.
According to the technical scheme, the signal transmitting module is mainly a 125K antenna and is used for wirelessly transmitting the signals which are reversely amplified by the TC4422MOS driver and the push-pull MOS DMC3018 chip.
According to the technical scheme, the RFID super positioning exciter takes an underground communication cable as a transmission antenna, the underground communication cable is a high-frequency cable, and an outer conductor of the high-frequency cable is not fully shielded and is provided with a leakage groove or a sparse braid.
According to the above technical solution, the calculation formula of the transmission loss of the radio signal in the air is:
Loss＝32.44+20log d(Km)+20log f(Mhz)；
wherein d is a transmission distance and f is a transmission frequency;
the RFID super positioning exciter adopts 125KHz low-frequency triggering excitation and 2.4GHz high-frequency communication, the low-frequency triggering can ensure a more reliable and stable detection triggering positioning distance due to small signal loss, the 2.4Ghz high-frequency communication also ensures enough communication bandwidth and anti-interference performance, and the 125Khz excitation power is adjusted by software to meet the real-time positioning requirements of different application scenes.
According to the technical scheme, in the formula, the propagation fading and loss of radio signals in the air and the transmission distance form a specific logarithmic relation, when a 125KHZ excitation signal is stabilized at a certain amplitude, the receiving sensitivity of the RFID positioning tag is relatively consistent, then the distance meeting the triggering requirement when the RFID positioning tag is close to a leakage cable is quasi real-time data which can be used as a positioning criterion, after the positioning tag is triggered, the tag sends real-time position information to a positioning base station through 2.4GHZ, and the positioning base station can record the current position of the tag, so that the identity positioning of the tag is realized, and the tag positioning track can be traced through inquiring historical record data.
According to the technical scheme, a plurality of RF ID exciters are adopted to cooperate with one another to locate a complex open area RFID area, leakage cables are flexibly adopted according to different field area division, different areas can be distinguished through corresponding buried cables, common frequency interference is easily generated even if part of the RFID exciters are close to one another, and a 2.4G time slot control mechanism is adopted to efficiently realize the low-delay anti-interference anti-collision label area location.
Compared with the prior art, the invention has the beneficial effects that: the time slot control of 2.4G signals is realized by utilizing a 2.4G transceiving polling module, the problem of mutual collision between positioning exciters is avoided, the 125K signal programmable power supply adjusting module is used for adjusting the power supply voltage and realizing the stepless adjustment of wireless signal power, the RFID super positioning exciter adopts 125KHz low-frequency trigger excitation and 2.4GHz high-frequency communication, the low-frequency trigger can ensure the farther, more reliable and stable detection trigger positioning distance due to small signal loss, the high-frequency communication of 2.4-2.5Ghz also ensures enough communication bandwidth and anti-interference performance, in addition, the software adjustment of 125Khz excitation power meets the real-time positioning requirements of different application scenes, and an excitation inductance cable can meet the requirements of various open-area intelligent property associations according to the design scheme of buried using scenes through the high-efficiency matching of distributed inductance and RFID positioning excitation, the device is particularly suitable for irregular site positioning excitation application and large-area site RFID positioning excitation application, and the relative position of the underground excitation inductor is fixed, the principle that limited radiation is added to distributed conduction of 125KHZ low-frequency inductor is skillfully utilized, stable and reliable excitation triggering is realized, and reliable positioning is realized, and after the technology of the invention is adopted, only one 125KHZ super positioning exciter is needed to be adopted for a complex site and an application scene, so that the problem of low-frequency cross interference does not exist, the problems of positioning interference, error positioning and the like are effectively solved, if the positioning exciter is needed to be additionally arranged, the super exciter adopts 2.4GHZ for time slot control, the same-frequency interference and excitation signal collision of the positioning exciter are effectively prevented, and a high-cost-performance RFID positioning solution is provided for positioning excitation of a specific application scene.
Drawings
FIG. 1 is an overall block diagram of an RFID superlocation actuator of the present invention;
FIG. 2 is a schematic diagram of a wireless polling structure of a 2.4G transmit-receive polling module of an RFID super positioning exciter according to the present invention;
FIG. 3 is a flow chart of an RFID location operation of an RFID superlocation exciter of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b): as shown in fig. 1-3, the present invention provides a technical solution, an RFID super positioning exciter, which includes an ARM main control module, a 2.4G transceiving polling module, a 125K signal program-controlled power adjustment module, a 125K signal synthesizing and amplifying module, and a signal transmitting module;
the 2.4G transceiving polling module is electrically connected with the ARM main control module, the output end of the ARM main control module is respectively electrically connected with the input ends of the 125K signal programmable power supply adjusting module and the 125K signal synthesizing and amplifying module, and the output ends of the 125K signal programmable power supply adjusting module and the 125K signal synthesizing and amplifying module are both electrically connected with the input end of the signal transmitting module;
ARM host system receives the polling data through 2.4G receiving and dispatching polling module in real time, it is when current address signal to receive, ARM host system is according to the data format, utilize 125K signal synthesis amplification module to synthesize the amplification to data, signal transmission module goes out wireless signal transmission, 2.4G receiving and dispatching polling module is used for realizing the polling of 2.4G signal and receives and dispatches, utilize 2.4G receiving and dispatching polling module to realize the time slot control to 2.4G signal, avoid appearing the problem of mutual collision between the location exciter, 125K signal programmable power supply adjustment module is used for adjusting mains voltage's height, to the regulation of voltage height, according to the formula:
P＝U2/R；
the transmission power can be adjusted, the higher transmission power can lead the transmission distance of the wireless signal to be farther, and meanwhile, the loss of the wireless signal in the transmission process can be effectively reduced, so that the transmission of the wireless signal is more accurate, and the stepless adjustment of the wireless signal power can be realized.
The 2.4G receiving and dispatching polling module comprises a host and a plurality of slave machines, wherein the host transmits 125K signals and simultaneously starts a 2.4G command to manage the slave machines, the slave machines sequentially transmit 125K signals in a polling mode, the slave machines receive the 2.4G commands transmitted by the host and transmit the 125K signals, wireless circulation of the 125K signals can be realized, collision among the signals caused by simultaneous transmission of the same wireless signals is avoided, the problem of co-frequency interference of the 125K trigger can be effectively solved, the equipment is simple and rapid to install, and the construction efficiency is greatly improved.
The ARM main control module mainly comprises an STM32F051C8 chip, a maximum frequency of 48MHZ, a 64KB flash, an 8KB RAM and rich peripherals, wherein the STM32F051C8 chip is used for controlling the whole super positioning exciter.
125K signal programme-controlled power adjustment module includes MAX5128 digital potentiometer and 29302WU chip, ARM main control module adjusts the inside resistance of MAX5128 digital potentiometer through 2 line communication modes, MAX5128 digital potentiometer and resistance R8 and resistance R10 constitute bleeder circuit, control the ADJ pin of 29302WU chip, change 29302WU chip's output voltage, change the power of 125K wireless signal transmission, and then realize the regulation to wireless signal transmission distance.
The 125K signal synthesis and amplification module comprises a TC4422MOS driver and a push-pull MOSDMC3018 chip, Manchester code data flows IN through ports Q1, Q2 and Q3 and is synthesized with standard 125K square waves input by PWM _ IN, data received by the ARM main control module is synthesized with the standard 125K square waves, the synthesized data is reversed and amplified through the TC4422MOS driver and the push-pull MOS DMC3018 chip, and power supplies of the TC4422MOS driver and the push-pull MOS DMC3018 chip are dynamically adjusted through the 125K signal program control power supply adjustment module.
The signal transmitting module is mainly a 125K antenna and is used for wirelessly transmitting signals which are reversely amplified by the TC4422MOS driver and the push-pull MOS DMC3018 chip.
The RFID super positioning exciter takes an underground communication cable as a 125K transmission antenna of a signal transmitting module, the underground communication cable is a high-frequency cable, an outer conductor of the high-frequency cable is not fully shielded and is provided with a leakage groove or sparse weaving, a part of signals transmitted inside the leakage cable are leaked to an external space near the cable through the leakage groove or a sparse weaving hole and are provided for a mobile RFID positioning receiving label, as long as the leakage cable passes through the leakage cable, a 125KHZ positioning triggering excitation signal can be expanded to nearby parts, aiming at an irregular or large-area RFID positioning excitation site, according to distributed inductance and radiation acting distance of the embedded cable, excitation power factors can be allocated and matched, super RFID accurate positioning excitation is realized, the problem of positioning coverage overlapping interference is avoided, the problems of over-positioning and leakage positioning are effectively solved, and meanwhile, great convenience is brought to site construction debugging, the efficiency of positioning excitation debugging is improved.
The calculation formula of the transmission loss of the radio signal in the air is as follows:
Loss＝32.44+20log d(Km)+20log f(Mhz)；
wherein d is a transmission distance and f is a transmission frequency;
when the transmission distance d is 20km and the transmission frequency f is 2400MHz, according to the formula:
Loss＝32.44+20log20+20log2400＝126.04；
the RFID super positioning exciter adopts 125KHz low-frequency triggering excitation and 2.4GHz high-frequency communication, the low-frequency triggering can ensure a more reliable and stable detection triggering positioning distance due to small signal loss, the 2.4Ghz high-frequency communication ensures enough communication bandwidth and anti-interference performance, and the 125Khz excitation power is software-adjusted to meet the real-time positioning requirements of different application scenes, so that the transmission loss of wireless signals is smaller, and the transmission of the wireless signals is more stable.
In the formula, the propagation fading and loss of radio signals in the air and the transmission distance form a specific logarithmic relation, when a 125KHZ excitation signal is stabilized at a certain amplitude, the receiving sensitivity of the RFID positioning tag is relatively consistent, then the distance meeting the triggering requirement when the RFID positioning tag is close to a leakage cable is the quasi-real-time data which can be used as the positioning criterion, after the positioning tag is triggered, the tag sends real-time position information to a positioning base station through 2.4GHZ, and the positioning base station can record the position of the tag at that time, so that the identity positioning of the tag is realized, the positioning information is started and stored, and the positioning track of the tag can be traced through inquiring historical recording data.
A plurality of RFID exciters are adopted to cooperate with a positioning principle for the RFID area positioning of a complex open area, leakage cables are flexibly adopted according to the division of different area areas, different areas can be distinguished through corresponding buried cables, the same frequency interference is easily generated even if part of the RF ID exciters are close to each other, and a 2.4G time slot control mechanism is adopted to efficiently realize the anti-interference anti-collision label area positioning with low time delay.
The working principle of the invention is as follows: firstly, an RFID super locator is installed according to a field, a high-frequency communication leakage cable is adopted, when an RFID positioning label is close to the vicinity of the leakage cable and meets the triggering requirement, the distance can be used as quasi-real-time data of a positioning criterion, when the positioning label is triggered, the label sends real-time position information to a positioning base station through 2.4GHZ, the positioning base station can record the current position of the label so as to realize label identity positioning, and can trace the positioning track of the label by inquiring historical record data, when a super positioning exciter is used, a 2.4G transceiving polling module is used for carrying out wireless polling, a host machine is used for transmitting 125K signals, command signals are sent to a plurality of slave machines at the same time, the slave machines are managed, when the slave machines receive management command signals transmitted by the host machine, the slave machines transmit 125K signals, and time slot control among the signals is realized, the problem of signal co-frequency interference can be effectively avoided;
the ARM main control module realizes information interaction with the 2.4G transceiving and polling module, the 125K signal program control power supply adjusting module and the 125K signal synthesizing and amplifying module are controlled, the 125K signal program-controlled power supply adjusting module adjusts the voltage of the super positioning exciter, realizes the adjustment of the transmitting signal power of the exciter and the stepless adjustment of the transmitting power of the exciter, so that the voltage of the super positioning exciter can be adjusted according to different terrains, the distance of the signal transmission of the exciter is adjusted, so that the mutual interference among wireless signals can be effectively avoided, the transmission and the coverage of the signals are more comprehensive, the 125K signal synthesis and amplification module transmits the wireless signals with corresponding frequencies through the transmitting antenna, activating the tag in an inductive coupling mode, and transmitting tag information to a 2.4G card reader by the tag in a 2.4G frequency band;
the signal transmitting module takes the high-frequency communication leakage cable as a transmitting antenna, the high-frequency communication leakage cable is embedded underground, leakage of wireless signals is achieved by utilizing a leakage groove and sparse weaving of the high-frequency communication leakage cable, when the tag card is close to the high-frequency communication leakage cable, the trigger is triggered, the 125KHz trigger is designed by adopting a common mode resistant filter circuit power supply source and is matched with a high-linearity adjustable excitation power supply voltage design method, the problems of high linearity and adjustable excitation power are solved ingeniously, and stepless accurate adjustment of a positioning action distance is achieved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (9)
1. An RFID superlocation exciter, comprising: the positioning exciter comprises an ARM main control module, a 2.4G transceiving polling module, a 125K signal program-controlled power supply adjusting module, a 125K signal synthesizing and amplifying module and a signal transmitting module;
the 2.4G transceiving polling module is electrically connected with the ARM main control module, the output end of the ARM main control module is respectively electrically connected with the input ends of the 125K signal programmable power supply adjusting module and the 125K signal synthesizing and amplifying module, and the output ends of the 125K signal programmable power supply adjusting module and the 125K signal synthesizing and amplifying module are both electrically connected with the input end of the signal transmitting module;
the ARM main control module receives polling data in real time through the 2.4G receiving and dispatching polling module, when a current address signal is received, the ARM main control module synthesizes and amplifies the data through the 125K signal synthesis and amplification module according to a data format, the signal transmitting module transmits a wireless signal, the 2.4G receiving and dispatching polling module is used for achieving polling receiving and dispatching of the 2.4G signal, the 2.4G receiving and dispatching polling module is used for achieving time slot control of the 2.4G signal, and the 125K signal program control power supply adjusting module is used for adjusting the height of power supply voltage.
2. An RFID superlocation exciter according to claim 1, wherein: the 2.4G transceiving polling module comprises a host and a plurality of slaves, wherein the host transmits 125K signals and simultaneously starts a 2.4G command management slave, the slaves sequentially transmit 125K signals in a polling mode, and the slaves receive the 2.4G commands transmitted by the host and transmit 125K signals.
3. An RFID superlocation exciter according to claim 1, wherein: the ARM main control module mainly comprises an STM32F051C8 chip, and the STM32F051C8 chip is used for controlling the whole super positioning exciter.
4. An RFID superlocation exciter according to claim 1, wherein: the 125K signal programmable power supply adjusting module comprises a MAX5128 digital potentiometer and a 29302WU chip, the ARM main control module adjusts the internal resistance value of the MAX5128 digital potentiometer in a 2-wire communication mode, the MAX5128 digital potentiometer, a resistor R8 and a resistor R10 form a voltage dividing circuit to control an ADJ pin of the 29302WU chip, the output voltage of the 29302WU chip is changed, and the power transmitted by 125K wireless signals is changed.
5. An RFID superlocation exciter according to claim 1, wherein: the 125K signal synthesis and amplification module comprises a TC4422MOS driver and a push-pull MOSDMC3018 chip, data received by the ARM main control module is synthesized with standard 125K square waves, the synthesized data is reversed and amplified through the TC4422MOS driver and the push-pull MOSDMC3018 chip, and power supplies of the TC4422MOS driver and the push-pull MOSDMC3018 chip are dynamically adjusted through the 125K signal program control power supply adjustment module.
6. An RFID superlocation exciter according to claim 5, wherein: the signal transmitting module is mainly a 125K antenna and is used for wirelessly transmitting the signals which are reversely amplified by the TC4422MOS driver and the push-pull MOSDMC3018 chip.
7. An RFID superlocation exciter according to claim 1, wherein: the RFID super positioning exciter takes a buried communication cable as a transmission antenna, the buried communication cable is a high-frequency cable, and an outer conductor of the high-frequency cable is not fully shielded and is provided with a leakage groove or a sparse weaving structure.
8. An RFID superlocation exciter according to claim 1, wherein: the calculation formula of the transmission loss of the radio signal in the air is as follows:
Loss＝32.44+20log d(Km)+20log f(Mhz)；
wherein d is a transmission distance and f is a transmission frequency;
the RFID super positioning exciter adopts 125KHz low-frequency triggering excitation and 2.4GHz high-frequency communication.
9. An RFID superlocation exciter according to claim 8, wherein: in the formula, the propagation fading, the loss and the transmission distance of a radio signal in the air form a specific logarithmic relation, when a 125KHZ excitation signal is stabilized at a certain amplitude, the receiving sensitivity of the RFID positioning label is relatively consistent, then the distance meeting the triggering requirement when the RFID positioning label is close to the leakage cable is the quasi-real-time data which can be used as the positioning criterion, after the positioning label is triggered, the label sends real-time position information to the positioning base station through 2.4GHZ, and the positioning base station can record the position of the label at that moment, thereby realizing the label identity positioning and tracing the label positioning track through inquiring historical record data.
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