CN102298685A - Automotive electronic radio-frequency identification parameter detecting system based on virtual instrument - Google Patents
Automotive electronic radio-frequency identification parameter detecting system based on virtual instrument Download PDFInfo
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Abstract
The invention discloses an automotive electronic radio-frequency identification parameter detecting system based on a virtual instrument. The system mainly comprises an antenna, a cable and signal distributing device, a radio-frequency and analog-to-digital converting and switching module, an LAN (local area network) bus and a computer and measuring software; the system completes the radio-frequency detection and measurement of an RFID (radio frequency identification) component by executing the functional steps: self detecting, calibrating, collecting, analyzing, automatically generating a whole process report from software and the like; by the system, the standard format problem that a conventional measuring instrument cannot carry out measurement is solved and the signal analyzing way of the instrument is expanded, and the signal analysis problem of the virtual instrument in automotive electronic application is solved; and the algorithm of communication is implanted in the computer, so as to solve the production line measurement requirement of production manufacture and development and verification of the virtual instrument, such as multi-standard demodulation, analysis, statistic and the like. Furthermore, according to the invention, the path calibration problem which only can be completed with need of an expensive network analyzer is solved by virtue of signal generation and multi-module synchronous operation analysis of the virtual instrument.
Description
Technical field
The present invention relates to a kind of automotive electronics radio-frequency (RF) identification parameter detecting system, particularly relate to a kind of whether qualified automotive electronics radio-frequency (RF) identification parameter detecting system of RFID electronic tag that is used on the testing automobile based on virtual instrument.
Background technology
The RFID communication system more and more is applied to all trades and professions, and especially the RFID communication system of RFT pattern has occupied automotive electronics recognition technology main flow with its low-power consumption, low cost, easily dispose feature.The RFT mode of operation is meant that card reader sends continual carrier wave (CW) signal as the energy pumping signal to label, initiates communication, and label responds this excitation and feedback reverse signal.The RFID that is not both with traditional wireless communication mode maximum receives and dispatches separating of path obviously, and it is different with the received signal path that promptly read write line sends signal.But different path loss needs different offsets, and this offset need obtain by dividing other path calibration.This special communication pattern needs the RFID measuring system by being different from traditional system configuration.
The radio frequency parameter of REID measures at present all that for example spectrum analyzer and VSA are finished by universal instrument.These general purpose instruments can only be according to having formed the standard techniques analytic signal on the market, ISO/IEC14443 for example, ISO/IEC18000-2,3,4,5,6,7; ISO/IEC15693, standards such as NFC are exactly some typical technology.And in the field of radio frequency identification customization, proprietary, and the technology of upgrade encryption algorithm is very general, for example the electron key technology of automotive electronics just has been to use the RFID signal of encrypting.Under this situation, even also powerless for the simplest ASK and fsk signal general purpose instrument.
For automotive electronics RFID measuring system, instrument need be carried out time-domain analysis, frequency-domain analysis, and separate the mediation protocal analysis.This 4 big alanysis need be carried out simultaneously, and analyze the unlike signal standard simultaneously, virtual instrument has born advantage, because virtual instrument is different from intelligence instrument, intelligence instrument relies on embedded and methods analyst program firmware preestablishes, the program of virtual instrument is independent of hardware and exists, and utilizes VC, C++, Python, Scripts, analysis instruments such as Matlab carry out, and instrument development personnel upgrading and expansion only are software works.At present virtual instrument is mainly used in industrial automation, also belongs to blank for the detection system of communication and radio-frequency measurement, especially automotive electronic technology and technology of Internet of things RFID.
Therefore, existing instrument analysis technology, the feature that is subject to hardware clearly, the 125KHz that uses of RFID technology of Internet of things for example, 13.56M, wait high frequency and ultrahigh frequency, also there is 925MHz, 2.4GHz, the radio frequency standard of frequency range, even also have microwave frequency bands such as being used for radar 5.8GHz.Changed a standard and often meaned that system will change the hardware instrument, brings inconvenience to test job.Improved the cost of test, made to detect and measure to can not get effectively carrying out and promoting, influenced the quality of product in development and general company.
In a word, present various RFID detection systems all are by increasing the complexity of general purpose instrument, by changing the update that the hardware instrument satisfies pure software upgrading and technical standard, isolated hardware and software algorithm relation between the two, inevitably have certain limitation.Simultaneously,, have more technical standard requirement along with the continuous development of automotive telematics technology, the complete vehicle quality requirement, the application demand of detection system, existing scheme fail to provide an effective solution so far.
In sum, problem demanding prompt solution is need improve present RFID detection system, to overcome the shortcoming that it too is subject to the dirigibility of hardware shortage.
Summary of the invention
Technical matters to be solved by this invention is, a kind of automotive electronics radio-frequency (RF) identification parameter detecting system based on virtual instrument is provided, it has solved traditional function singleness when utilizing the common bench instrumental analysis, the instrument kind that the composition system needs is many, the price height, networking is inconvenient, and instrument cubicle is difficult to synchronously and triggers, and existing firmware demodulation ability is limited, only solves the conventional power and the weak points such as measurement of frequency.
For solving the problems of the technologies described above, basic design of the present invention is: by combine (hereinafter referred to as " virtual instrument ") of software with hardware, finish detection to the RFID electronic tag by software and the mutual work compound of hardware.Particularly, utilize virtual instrument to substitute existing common bench instrument, realize that many standards of frequency range and hardware are compatible flexibly; By the original firmware method of software replacement, on the code level, realize signal analysis and processing support to standard; The multianalysis that realizes radio frequency identification signal by the update software algorithm detects; Standard calibration that utilization proposes and self check definition, the due precision of strict regulations virtual instrument and repetition performance.By above improvement, the detection needs that the native system precision fully can be realistic have been guaranteed.
As a kind of technical scheme that realizes that the present invention conceives substantially, this is to adopt a kind of automotive electronics radio-frequency (RF) identification parameter detection method based on virtual instrument, and this method may further comprise the steps:
Self check calibration flow process: successively to software subsystem, PXI or LXI virtual instrument control module, baseband circuit, ADC, DAC unit, radio frequency and frequency changer circuit unit carry out the self check calibration;
Isolation is checked flow process: measure the loss of read write line transmission path, the loss of read write line RX path, emitting antenna and receiving antenna isolation respectively, whether the radio frequency link overall isolation degree that measurement result is compared in order to judge system is qualified;
Detect and testing process: the receiving and transmitting signal to the RFID radio-frequency (RF) identification carries out check and analysis, to judge that whether tested RFID label is by setting thresholding and standard.
In the described automotive electronics radio-frequency (RF) identification parameter detection method, carry out following steps in the described self check calibration flow process successively based on virtual instrument:
Software subsystem self integrity checking;
Software subsystem is communicated by letter with the instrument control module, and instrument control module rreturn value is correct, carries out next step, otherwise mistake and handling up to by this step;
System's output radio-frequency (RF) calibration signal switches by transmission antennas transmit by switch;
Switch by the receiver of receiving antenna received signal by switch to system;
Emissive power is deducted the signal power that receives obtain isolation, pass through greater than 50dB, otherwise mistake and handling up to by this step;
In the described automotive electronics radio-frequency (RF) identification parameter detection method based on virtual instrument, described isolation is checked and is carried out following steps in the flow process successively:
RX path to electronic radio frequency identification radio frequency parameter system is calibrated, and the path loss of working frequency points is recorded as L1;
Transmission path to electronic radio frequency identification radio frequency parameter system is calibrated, and the path loss of working frequency points is recorded as L2;
Transmitted power and received power during to normal active configuration are calibrated, with the transmission of working frequency points with receive isolation and be recorded as L3;
Judge whether L1+L2＜L3 sets up, if set up then isolation detects and to pass through; Otherwise isolation is not up to standard, and check system is also adjusted the place, detects up to above-mentioned isolation and passes through.
In the described automotive electronics radio-frequency (RF) identification parameter detection method based on virtual instrument, carry out following steps in described detection and the testing process successively: (1) gauge tap works in antenna and transmits and receives the arrangement of antennas form; (2) according to the scope of the running parameter of tested RFID label, the read write line parameter is set, the read write line operate as normal is in " identification " (making an inventory) state, discerns and returns the recognition result record of nominal continuously and put on record being arranged in RFID label on the measured piece; (3) the zero groove of control instrument is provided with the parameter of sampling, and parameter comprises expectation power, centre frequency, and bandwidth, time span, sampling rate and overtime is worked under the parameter that is provided with by zero groove control radio frequency and Base Band Unit; Whether (4) signal that obtains before the timer expiry belongs to effective reception, satisfied default from the time-domain sampling signal authentication length and the power that obtain, does not satisfy the system that then returns the 1st step inspection read write line and electronic tag composition and is in operate as normal to guarantee them; (5) to the sampled data analysis, at first analyze time domain and frequency spectrum and frequency of operation, guarantee that sampled signal has comprised the expectation instruction, and instruct and satisfy normal frequency tolerance state, if can not normally analyze, returned for the 3rd step and check and debugging; (6) sampled data is analyzed the trial solution adjusting data according to required demodulation parameter, the demodulation parameter of separating timing comprises: data rate, modulation system, pilot frequency mode, digital coding, check code; (7) enter the protocol parameter analysis phase after demodulation finishes, to sampled data analysis instruction interval, instruction type and kind, and whether the MAC layer decoder of instruction is correct; (8) finish measurement detection task, whether the RFID electronic tag of reporting this test is by setting thresholding and standard.
A kind of automotive electronics radio-frequency (RF) identification parameter detecting system based on virtual instrument, this system comprises: modular instrument, emitting antenna, receiving antenna, measure antenna, measured piece, the remote networking computing machine, measure radio-frequency cable, control and communication bus cable, and radio-frequency cable, wherein, modular instrument is connected with antenna by radio-frequency cable, modular instrument sends pumping signal and receives the RFID label by receiving antenna to the RFID at measured piece place label by emitting antenna and responds the radiofrequency signal that this pumping signal is fed back, modular instrument is by measuring the transmitting-receiving radiofrequency signal of the above-mentioned RFID label of antenna trapping simultaneously, and modular instrument carries out communication by communication bus cable and remote networking computing machine.
Describedly comprise: rf receiver unit, ADC unit, DAC unit, rf transmitter unit, switch control and communication unit based on the described modular instrument in the automotive electronics radio-frequency (RF) identification parameter detecting system of virtual instrument.
Advantage of the present invention is, native system is mainly by antenna, cable and signal distribution equipment, radio frequency and analog to digital conversion and switch module, LAN bus, computing machine and Survey Software are formed, system is by carrying out self check, and calibration is gathered, analyze, software generates functional steps such as whole process report automatically and finishes the radio frequency of RFID parts and detect and measure; The present invention adopts virtual instrument technique to make detection system be fit to detect multiple REID standard signal; By modularizations such as computer software and radio frequency and baseband sampling instrument is integrated, improved the function and the efficient of detection system.Further, native system has solved the standard format problem that the traditional measurement instrument can't be measured, and has expanded the signal analysis mode of instrument; Solve the signal analysis problem of virtual instrument in automotive electronics is used, the algorithm of communicating by letter has been implanted computing machine, thereby solved many standard demodulation of virtual instrument, the production line test demand that research and development such as analysis and statistics are verified and manufactured.Further again, native system takes place and the synchronous operation of analysis multimode by the signal of virtual instrument, has solved the path calibration problem that the expensive network analyzer of common needs just can be finished.
Description of drawings
Fig. 1 is the one-piece construction synoptic diagram that the present invention is based on the automotive electronics radio-frequency (RF) identification parameter detecting system of virtual instrument;
Fig. 2 is the arrangement plan that the present invention is based on the automotive electronics radio-frequency (RF) identification parameter detecting system calibration arrangements-RX path of virtual instrument;
Fig. 3 is the arrangement plan that the present invention is based on the automotive electronics radio-frequency (RF) identification parameter detecting system calibration arrangements-transmission path of virtual instrument;
Fig. 4 is the synoptic diagram of instrument sampled signal array format that the present invention is based on the automotive electronics radio-frequency (RF) identification parameter detecting system of virtual instrument;
Fig. 5 is the software flow pattern that the present invention is based on the automotive electronics radio-frequency (RF) identification parameter detecting system of virtual instrument.
Embodiment
For further disclosing technical scheme of the present invention, be described with reference to the accompanying drawings embodiments of the present invention now:
This part peace is set forth embodiments of the present invention according to following order, but under the situation based on identical inventive concept, the present invention is not limited to following embodiment:
One, the parameter of test platform hardware is selected;
Two, the hardware configuration of test platform;
Three, the workflow of system equipment, it is followed successively by: self check calibration flow process, the isolation inspection detects and test;
Four, system software characteristics design, it has guaranteed the realization of native system function and performance;
Five, system software is mainly carried out flow process.
It is as follows now to press the concrete division of said sequence:
[parameter of test platform hardware is selected]
The parameter of test platform hardware selects specifically to comprise following technical indicator:
1. modular instrument partly comprises radio frequency, base band, switch matrix and control circuit;
2. radio frequency comprises up-conversion and down coversion, is respectively applied for signal and sends and receive;
3. base band comprises ADC and DAC module, must be able to work simultaneously, and resolution reaches more than the 14bit; More than the base-band digital sampling clock 40MHz, the sample of memory degree of depth is greater than 64Mb, and the input range dynamic range is greater than 60dB, has real-time triggering function, have the waveform memory function, and can carry out data transmission, or utilize quasi real time bus to control and communicate by letter with LAN or usb protocol;
4. switch matrix is realized the switching of internal radio frequency path, is used for robotization control, is made up of switch, multiplexer and matrix;
Control circuit be responsible for computing machine on measurement of virtual instrument software quasi real time communicate by letter, comprise that trigger mode, incoming level, sampling rate, sampling length, filtering characteristic, signal condition, low noise that module hardware is set amplify, attenuation function, make the signal that reaches radio-frequency module be in the optimum linear scope of work, guarantee undistorted input;
6. computing machine is a Long-distance Control, needn't be in same place with measured piece, because the often dangerous factor of the testing environment of automotive electronics comprises existence such as excessive radiation and high-power power amplifier, so tester's external control overall flow at the scene;
7. the placement location of emitting antenna and receiving antenna and measured piece be in effective horizon range, do not have between the path to cover and stop;
8. the minimum radio frequency isolation degree of the placement of emitting antenna and receiving antenna is 30dB, and situation must guarantee 55dB usually;
9. the placement direction of emitting antenna and receiving antenna must be isolated to carry out the space greater than 30 degree angles, the antenna distance 30cm of being separated by at least;
10. emitting antenna and receiving antenna belong to high-gain and directive antenna, and the antenna main lobe width is less than 50 degree;
11. every of radio-frequency cable length can not surpass 3 meters, by the interface of stationary installation attached cable and antenna, and the assurance position can be measured and record.
Secondly, the radio frequency parameter measuring system of REID is carried out work according to specific flow process, to guarantee precision, degree of stability, but repeatability and traceability.Specifically by the self check process, calibration flow process and detection and testing process are formed.Wherein, the calibration flow process is the basis of all processes, concrete enforcement is sent and the receiver module realization by the signal of hardware components, controls the virtual instrument module automatically by software and sends set specific frequency signal and receive set specific frequency signal simultaneously, and guarantee that the signal to noise ratio (S/N ratio) of operation satisfies 30dB.
[hardware configuration of test platform]
Fig. 1 is the one-piece construction synoptic diagram that the present invention is based on the automotive electronics radio-frequency (RF) identification parameter detecting system of virtual instrument, comprise among the figure: modular instrument 1, emitting antenna 2, receiving antenna 3, measure antenna 4, measured piece 5, remote networking computing machine 6, measure radio-frequency cable 7, control and communication bus cable 8, and radio-frequency cable 9, wherein, modular instrument 1 is connected with antenna by radio-frequency cable 9, modular instrument 1 sends pumping signal and responds the radiofrequency signal that this pumping signal is fed back by receiving antenna 3 reception RFID labels by the RFID label of emitting antenna 2 to measured piece 5 places, the transmitting-receiving radiofrequency signal that while modular instrument 1 is caught above-mentioned RFID label by measurement antenna 4 promptly responds the radiofrequency signal that this pumping signal is fed back to pumping signal and the RFID label that the RFID label sends, and modular instrument 1 carries out communication by communication bus cable 8 and remote networking computing machine 6.Particularly, comprise in the described modular instrument 1: rf receiver unit, ADC unit, DAC unit, rf transmitter unit, switch control and communication unit.
Detection system of the present invention combines by software and hardware, thereby by software and the mutual work compound of hardware the receiving and transmitting signal analysis of tested RFID radio-frequency (RF) identification is finished the detection of RFID electronic tag is judged promptly whether tested RFID electronic tag is qualified.Concrete testing process will be described in detail with the lower part.
[workflow of system equipment]
Native system equipment is divided in the course of the work:
Self check calibration flow process;
Isolation is checked;
Detect and test.
Whether above-mentioned three parts are qualified in order to the radio frequency link overall isolation degree of judging system, and the receiving and transmitting signal to the RFID radio-frequency (RF) identification on qualified basis carries out check and analysis.
The concrete objective for implementation and the operating process of these 3 flow processs are described respectively below.
Self check calibration flow process at object be successively respectively:
Software subsystem;
PXI or LXI virtual instrument control module are generally zero groove unit;
Baseband circuit, ADC, DAC unit;
Radio frequency and frequency changer circuit unit;
The calibration flow process is:
1. software subsystem self integrity checking;
2. software subsystem is communicated by letter with the virtual instrument control module, and the instrument rreturn value is for correctly carrying out next step, otherwise mistake and handling up to by this step;
3. system's output radio-frequency (RF) calibration signal switches by transmission antennas transmit by switch;
4. switch by the receiver of receiving antenna received signal by switch to system;
5. emissive power is deducted the signal power that receives and obtain isolation, pass through greater than 50dB, otherwise mistake and handling up to by this step.
The object of isolation inspection is respectively:
The loss of read write line transmission path;
The loss of read write line RX path;
Emitting antenna and receiving antenna isolation.
Fig. 2 is the arrangement plan that the present invention is based on the automotive electronics radio-frequency (RF) identification parameter detecting system calibration arrangements-RX path of virtual instrument, Fig. 3 is the arrangement plan that the present invention is based on the automotive electronics radio-frequency (RF) identification parameter detecting system calibration arrangements-RX path of virtual instrument, and the concrete operations flow process is:
1. calibrate according to " automotive electronics radio-frequency (RF) identification radio frequency parameter system calibration configuration-RX path " arrangement plan of Fig. 2, the path loss of working frequency points is recorded as L1;
2. calibrate according to " automotive electronics radio-frequency (RF) identification radio frequency parameter system calibration configuration-transmission path " arrangement plan of Fig. 3, the path loss of working frequency points is recorded as L2;
3. calibrate according to the operate as normal arrangement plan of Fig. 1, the transmission of working frequency points and reception isolation are recorded as L3;
4. check whether L1+L2＜L3 sets up, if set up then the radiofrequency signal that the signal leakage that sent by transmitting terminal reflects less than measured object to the radiofrequency signal of receiving end be described, detection is passed through, guarantee the correctness of method of testing and result's degree of accuracy by this committed step, otherwise the isolation L1+L2 of being not up to standard＜L3 is false, this moment, check system and adjust the place was last up to satisfying above-mentioned formula.Supplementary notes be that this step has been considered antenna gain, and think the antenna gain of label with reference to transmission, receive and measure the parameter of antenna 4, this sets up in radio system.
Detecting and testing process, is the radio frequency parameter measuring system normal running flow process of REID, and its objective for implementation comprises:
Antenna-emitting antenna, receiving antenna;
Equipment under test-automotive electronics RFID module;
Active devices-read write line;
Radio frequency receives the control module of instrument;
Radio frequency receives instrument;
The software analysis module.
Carry out the processing of radiofrequency signal according to the following steps order, analyze and measure:
1. utilize software control switch, antenna is worked in transmit and receive the arrangement of antennas form;
2. according to the scope of the running parameter of tested label, typical read write line parameter is set.The read write line operate as normal is in " identification " (making an inventory) state, discerns and returns the recognition result record of nominal continuously and put on record being arranged in electronic tag on the automobile;
3. the zero groove of software control instrument is provided with the parameter of sampling, and parameter comprises expectation power, centre frequency, and bandwidth, time span, sampling rate and overtime is worked under the parameter that is provided with by zero groove control radio frequency and Base Band Unit;
4. whether the signal that obtains before the timer expiry belongs to effective reception, satisfy defaultly from the time-domain sampling signal authentication length obtained and power, does not satisfy and then returns the system that the first step checks that read write line and electronic tag are formed and guarantee that they are in operate as normal;
By software to the sampled data analysis, at first analyze time domain and frequency spectrum and frequency of operation, guarantee that sampled signal has comprised expectation instruction, and instruction satisfies normal frequency tolerance state, if can not normally analyze, returned for the 3rd step and check and debugging;
6. sampled data is analyzed the trial solution adjusting data, find demodulation parameter automatically by searching algorithm software, data rate for example, modulation system, pilot frequency mode, digital coding, parameters such as check code, these all will be realized by this detection system software;
7. enter the protocol parameter analysis phase after demodulation finishes, to the sampled data analysis instruction at interval, instruction type and kind, and whether the MAC layer decoder of instruction is correct;
8. finish the detection task of measuring, output report, software report that automatically whether the electronic tag of this test is by setting thresholding and standard.
More than the 4th the step after all be software function, these functions are by a radio frequency, agreement and signaling software module realize, particularly, this software module is carried out the each side analysis according to the definition of standard (for example ISO IEC 18000 – 6 C etc.) to sampled data, and this is one of core of this detection system.
[system software characteristics design]
The software design of native system has following characteristic to guarantee the function and the performance of " based on the automotive electronics radio-frequency (RF) identification parameter detecting system of virtual instrument ":
1. quasi real time communicating by letter of authenticating computer and virtual instrument hardware module realized by closed-loop communication such as similar ping instruction;
2. check the hardware effort state, whether saturated such as front end particularly, whether base band overflows, and whether parameter setting and reading back coincide;
3. pre-service: the IQ vector signal that obtains is handled, guaranteed that subsequent operation is feasible.For comprising interference, low-frequency ripple fluctuates, and direct current can be done Filtering Processing.The simplest is that iq data filtering DC component and low frequency component are handled; Select the outer filter order that suppresses of suitable band edge steepness and band to carry out; Keep the variation and the details of RFID signal, only remove its DC power, so signal can not calculate radio-frequency power after the filtering.The code check of RFID forward signal is 26.7K-128Kbps, so the filtering cutoff frequency can be selected 2.6KHz; The data transfer rate 40K-640Kbps of reverse link signal, symbol rate 40K-5.12Msps, the filtering cutoff frequency can be selected 4KhZ.Comprehensively above-mentioned, can select 2.6KHz high-pass filtering and DC filter.In addition, note phase delay, SSB palpus linear process, and the FIR wave filter is preferential;
4. survey: feature judges whether the RFID signal occurs.Be the training detuner, fibrous root is surveyed signal factually and is asked for decision threshold.Particularly, survey this stage according to actual performance and be output as decision threshold level, can consider to handle together in conjunction with the burst location;
5. burst Burst locatees: all target analysiss instructions that intercept and capture the search volume.(forward direction, oppositely) because uncertain relative phase concerns between existence and the carrier wave, signal section therefore need happen suddenly detection.This step is by becoming simple after straight, the maximum cycle of RFID forward signal is about 100us, the maximum cycle of reverse signal is about 7ms (40K speed rates 255bit data), both length differ bigger, both depth of modulation are often different, also be that peak-to-average force ratio differs greatly, signal section power also has a little difference in addition.Under best relative phase relation, forward signal is than the low 2.7dB of carrier wave, and oppositely than the big 2.5dB of carrier wave.Under the situation that putative signal exists, can detect with following algorithm: a. calculates the amplitude mean value of signal in the setting of anticipation cycle; B. with 2 times of this unit to overall signal divide the cutting apart of stack (the first half that is next section in fact be exactly leading portion back half, be shown in Figure 4 11,12,13 signal subsection), (hiding hypothesis-signal entire length greater than 2 times of minimal detection period)-this section is the most key to be made as the N section; C. this N value is carried out sort, relatively, and ordering; D. ask Amax[i] and Amin[i], i represents the signal segment in N cycle, and the mean intensity of Aaverg=integral body; E. set a decision threshold, think that burst occurs, for example, 3Amin＜Aaverg＜Amax/3, we think and burst occurs, and the suspicious paragraph of mark can have a plurality ofly, and default maximum demodulation support is 128 burst for example; F. utilize appropriate Cycle Length, search window, comparison threshold obtains the burst position.Above step is Rough Inspection, and parameter can fine tuning;
6. screen: further judge whether to be instruction.Comprise signal section and generally roughly can drop in 2 sections detection windows, at this moment need the window in the above-mentioned steps is reduced to the length of minimum symbol period, carry out not overlapping retrieval, find the true rising of signal, the position of decline section is noted.Check whether signaling zone segment length and target setting mate,, next separate to be in harmonious proportion and measure if all pass through;
7. preceding reverse differentiation: supposition only needs at forward direction with when oppositely existing simultaneously to distinguish, because by every straight filtering, forward direction has not existed with the phase relation of reverse relative carrier wave direct current.But, remember that we have original signal, can compare: the first step, adjust back original iq data by the time location of signal, if find following information then think backscattered signal: it also is that the amplitude integration of signal is slightly greater than carrier amplitude, if find the depth of modulation of signal that amplitude is positioned on the carrier wave〉95% then think and be forward direction PRASK signal;
8. demodulation: the aforementioned result who searches is numbered with reverse according to forward direction respectively, deposit temporarily, forward signal calls the forward direction demodulating algorithm, reverse signal calls reverse demodulating algorithm, the bit accuracy that inspection demodulates, check logical mistake rate in the demodulation, makeing mistakes surpasses to a certain degree, changes the new demodulation of parameter renegotiation or changes direction demodulation once more.In addition, according to agreement, by MAC layer information, promptly detect forward direction query instruction earlier, obtain carrying out reverse demodulation after the reverse physical layer configuration, this is suitable for the ISO18000-6C system;
9. make mistakes and handle: be divided into that Physical layer is made mistakes and the MAC layer is made mistakes.Though Physical layer represents that some bit is incorrect, major part can be correctly by demodulation, and the bit demodulation behind the incorrect bit can recover normally, for example distortion that causes of burr and overshoot etc., and this cannot solve by self.The MAC situations such as CRC is not inconsistent of for example makeing mistakes are considered the conflict of reflex times simultaneously of many labels, and this also can be discerned by judging lead code, but this situation can't be accomplished demodulation simultaneously, unless more inputs are arranged;
10. signal imprinting: each is able to the instruction of correct demodulation, all will write down its physical layer parameter and MAC parameter with each demodulated symbols.Physical layer comprises 3. symbol lengths, 4 .PW, 5. dutycycles, 6. high level ON amplitudes, 7. low level OFF amplitudes, 8. data rates 9,2. fall time of 1. rise time. zero-time 10. and the time of the previous order fulfillment of the same type of time 15. distances of the previous order fulfillment of termination time 11. persistence lengths, 12. positive overshoot 13. negative overshoot 14. distances; The MAC layer parameter has only instruction just to have, comprise: 1. Delimiter length 2. Tari 3. TRCAl 4. RTCal 5. TRext 6. pilot tone modes 7. CRC whether consistent 8. have or not error code 9. have or not logic error (the PHY layer of separating timing is unusual) 10. oppositely or forward direction 11. instruction names claim – to can be used as a criterion 12. each parameter result 13 of demodulation success or not. having does not have to adjudicate phenomenon, in reverse tail.In sum, Physical layer just comprises 15 parameters, and the MAC layer comprises 13 parameters.The demodulation result of MAC can be as next step protocal analysis process;
11. result's output: with figure, modes such as literal or form represent said process and result to operating personnel, and the information of attached necessity.
[system software is mainly carried out flow process]
Fig. 5 is the software flow pattern that the present invention is based on the automotive electronics radio-frequency (RF) identification parameter detecting system of virtual instrument, and corresponding with above-mentioned [system software characteristics design], native system software is mainly carried out flow process and comprised: the software self check; Equipment Alignment; The environment calibration, sampling; Measure; Fault handling.
Particularly, the software self check is used for checking whether the environment of running software possesses, and for example whether the driver of PXI virtual instrument indispensability exists, if can not find crucial the driving, program will operate in the pure software pattern, i.e. join dependency hardware facility not;
Equipment Alignment is used for checking for example signal analyse block of hardware cell, signal generating module, the state of zero groove main frame, read its error status by drivings such as LXI, instrument must be returned as no error and can operate, otherwise the oneself state of these instruments can not guarantee that test result is correct;
The algorithm that the environment calibration utilizes above-mentioned " inspection of calibration and isolation " part to mention is realized, promptly guarantees the minimum requirements of forward path loss and reverse path loss stack greater than isolation;
Sampling element is initiated by software, requires hardware to sample, the hardware return results or overtime after, software is checked data, if find to have signal instruction to be analyzed in the data then enter the measurement entity; And if result data is incorrect, exceed standard, overtime, perhaps do not comprise any signal instruction that can analyze, then reenter sampling operation, until valid data arrive at, not corresponding not the repeating them here of " pre-service " to " examination " part of this part and above-mentioned [system software characteristics design];
" preceding reverse differentiation " and corresponding not the repeating them here of " demodulation " part of the software module of measuring phases and above-mentioned [system software characteristics design], the measurement function of finishing has " time domain measurement ", " frequency domain measurement ", " demodulation measurement ", " signalling analysis " 4 major parts, these several parts are progressive, with the physical layer parameter of acquisition measured signal and the content of MAC agreement, help user's orientation problem reason;
Fault handling partly will be pointed out the problem place to software operation person, and the proper operation environment of offering help and how to recover software.
By adopting technique scheme, the invention solves the standard format problem that the traditional measurement instrument can't be measured, expanded the signal analysis mode of instrument; Solved the signal analysis problem of virtual instrument in automotive electronics is used simultaneously, the algorithm of communication has been implanted computing machine, thus the production line test demand that many standard demodulation, analysis and the statistics etc. of solution virtual instrument are researched and developed checking and manufactured.And native system has solved the path calibration problem that the expensive network analyzer of common needs just can be finished by the signal generation and the synchronous operation of analysis multimode of virtual instrument.
More than, the basic ideas and basic principles of the present invention have been set forth by description of listed embodiment.But the present invention never is limited to above-mentioned listed embodiment, and every equivalent variations, improvement and deliberately of inferior quality behavior of doing based on technical scheme of the present invention of change all should belong to protection scope of the present invention.
Claims (6)
1. automotive electronics radio-frequency (RF) identification parameter detection method based on virtual instrument is characterized in that this method may further comprise the steps:
Self check calibration flow process: successively to software subsystem, PXI or LXI virtual instrument control module, baseband circuit, ADC, DAC unit, radio frequency and frequency changer circuit unit carry out the self check calibration;
Isolation is checked flow process: measure the loss of read write line transmission path, the loss of read write line RX path, emitting antenna and receiving antenna isolation respectively, whether the radio frequency link overall isolation degree that measurement result is compared in order to judge system is qualified;
Detect and testing process: the receiving and transmitting signal to the RFID radio-frequency (RF) identification carries out check and analysis, to judge that whether tested RFID label is by setting thresholding and standard.
2. the automotive electronics radio-frequency (RF) identification parameter detection method based on virtual instrument according to claim 1 is characterized in that, carries out following steps in the described self check calibration flow process successively:
Software subsystem self integrity checking;
Software subsystem is communicated by letter with the instrument control module, and instrument control module rreturn value is correct, carries out next step, otherwise mistake and handling up to by this step;
System's output radio-frequency (RF) calibration signal switches by transmission antennas transmit by switch;
Switch by the receiver of receiving antenna received signal by switch to system;
Emissive power is deducted the signal power that receives obtain isolation, pass through greater than 50dB, otherwise mistake and handling up to by this step.
3. the automotive electronics radio-frequency (RF) identification parameter detection method based on virtual instrument according to claim 1 is characterized in that, described isolation is checked and carried out following steps in the flow process successively:
RX path to electronic radio frequency identification radio frequency parameter system is calibrated, and the path loss of working frequency points is recorded as L1;
Transmission path to electronic radio frequency identification radio frequency parameter system is calibrated, and the path loss of working frequency points is recorded as L2;
Transmitted power and received power during to normal active configuration are calibrated, with the transmission of working frequency points with receive isolation and be recorded as L3;
Judge whether L1+L2＜L3 sets up, if set up then isolation detects and to pass through; Otherwise isolation is not up to standard, and check system is also adjusted the place, detects up to above-mentioned isolation and passes through.
4. the automotive electronics radio-frequency (RF) identification parameter detection method based on virtual instrument according to claim 1, it is characterized in that, carry out following steps in described detection and the testing process successively: (1) gauge tap works in antenna and transmits and receives the arrangement of antennas form; (2) according to the scope of the running parameter of tested RFID label, the read write line parameter is set, the read write line operate as normal is in " identification " (making an inventory) state, discerns and returns the recognition result record of nominal continuously and put on record being arranged in RFID label on the measured piece; (3) the zero groove of control instrument is provided with the parameter of sampling, and parameter comprises expectation power, centre frequency, and bandwidth, time span, sampling rate and overtime is worked under the parameter that is provided with by zero groove control radio frequency and Base Band Unit; Whether (4) signal that obtains before the timer expiry belongs to effective reception, satisfied default from the time-domain sampling signal authentication length and the power that obtain, does not satisfy the system that then returns the 1st step inspection read write line and electronic tag composition and is in operate as normal to guarantee them; (5) to the sampled data analysis, at first analyze time domain and frequency spectrum and frequency of operation, guarantee that sampled signal has comprised the expectation instruction, and instruct and satisfy normal frequency tolerance state, if can not normally analyze, returned for the 3rd step and check and debugging; (6) sampled data is analyzed the trial solution adjusting data according to required demodulation parameter, the demodulation parameter of separating timing comprises: data rate, modulation system, pilot frequency mode, digital coding, check code; (7) enter the protocol parameter analysis phase after demodulation finishes, to sampled data analysis instruction interval, instruction type and kind, and whether the MAC layer decoder of instruction is correct; (8) finish measurement detection task, whether the RFID electronic tag of reporting this test is by setting thresholding and standard.
5. automotive electronics radio-frequency (RF) identification parameter detecting system based on virtual instrument, it is characterized in that, this system comprises: modular instrument (1), emitting antenna (2), receiving antenna (3), measure antenna (4), measured piece (5), remote networking computing machine (6), measure radio-frequency cable (7), control and communication bus cable (8), and radio-frequency cable (9), wherein, modular instrument (1) is connected with antenna by radio-frequency cable (9), the RFID label that modular instrument (1) is located to measured piece (5) by emitting antenna (2) sends pumping signal and receives the RFID label by receiving antenna (3) and responds the radiofrequency signal that this pumping signal is fed back, modular instrument (1) is caught the transmitting-receiving radiofrequency signal of above-mentioned RFID label by measuring antenna (4) simultaneously, and modular instrument (1) carries out communication by communication bus cable (8) and remote networking computing machine (6).
6. the automotive electronics radio-frequency (RF) identification parameter detecting system based on virtual instrument according to claim 5, it is characterized in that described modular instrument comprises in (1): rf receiver unit, ADC unit, DAC unit, rf transmitter unit, switch control and communication unit.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103226169A (en) * | 2012-06-12 | 2013-07-31 | 嘉兴联星微电子有限公司 | Square wave detector for wireless wake-up circuit |
| CN104635049A (en) * | 2013-11-08 | 2015-05-20 | 苏州普源精电科技有限公司 | Spectrum analyzer with calibration function |
| CN104700131A (en) * | 2015-03-09 | 2015-06-10 | 东南大学 | Animal tag testing system based on virtual instrument |
| CN105426584A (en) * | 2015-11-04 | 2016-03-23 | 中国电子科技集团公司第四十一研究所 | Virtual instrument-based signal simulation system and method |
| CN105610530A (en) * | 2015-12-25 | 2016-05-25 | 航天恒星科技有限公司 | Satellite data acquisition and analysis method and system |
| CN106254009A (en) * | 2016-07-21 | 2016-12-21 | 北京航空航天大学 | A kind of Unmanned Aerial Vehicle Data Link test electromagnetic interference signal recurrence system and reproducing method |
| CN107566067A (en) * | 2017-09-27 | 2018-01-09 | 四川省大见通信技术有限公司 | A kind of method with CW signal detections with frequency interport isolation |
| CN111030891A (en) * | 2019-12-24 | 2020-04-17 | 武汉中元通信股份有限公司 | Communication detection equipment calibration system and method based on pxi |
| CN111209760A (en) * | 2020-03-04 | 2020-05-29 | 中国电力科学研究院有限公司 | Electronic tag safety protection test method and test system |
| CN114978363A (en) * | 2022-04-25 | 2022-08-30 | Oppo广东移动通信有限公司 | Debugging method and device of radio frequency circuit, electronic equipment and storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0853245A2 (en) * | 1996-12-30 | 1998-07-15 | Lucent Technologies Inc. | Modulated backscatter sensor system |
| CN101592705A (en) * | 2008-05-28 | 2009-12-02 | 北京中食新华科技有限公司 | Radio frequency identification RFID test system |
| CN202075748U (en) * | 2011-04-27 | 2011-12-14 | 昆山启业检测校准技术有限公司 | Automobile electronic radio-frequency identification parameter detection system based on virtual instrument |
-
2011
- 2011-04-27 CN CN201110106606.XA patent/CN102298685B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0853245A2 (en) * | 1996-12-30 | 1998-07-15 | Lucent Technologies Inc. | Modulated backscatter sensor system |
| CN101592705A (en) * | 2008-05-28 | 2009-12-02 | 北京中食新华科技有限公司 | Radio frequency identification RFID test system |
| CN202075748U (en) * | 2011-04-27 | 2011-12-14 | 昆山启业检测校准技术有限公司 | Automobile electronic radio-frequency identification parameter detection system based on virtual instrument |
Non-Patent Citations (2)
| Title |
|---|
| 孙树文等: "基于虚拟仪器技术的车辆监控系统设计", 《计算机测量与控制》 * |
| 江建军等: "近高频射频识别读写器虚拟仪器系统设计与实现", 《仪器仪表学报》 * |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103226169B (en) * | 2012-06-12 | 2015-07-08 | 殷明 | Square wave detector for wireless wake-up circuit |
| CN103226169A (en) * | 2012-06-12 | 2013-07-31 | 嘉兴联星微电子有限公司 | Square wave detector for wireless wake-up circuit |
| CN104635049A (en) * | 2013-11-08 | 2015-05-20 | 苏州普源精电科技有限公司 | Spectrum analyzer with calibration function |
| CN104635049B (en) * | 2013-11-08 | 2019-02-05 | 苏州普源精电科技有限公司 | A kind of spectrum analyzer with calibration function |
| CN104700131A (en) * | 2015-03-09 | 2015-06-10 | 东南大学 | Animal tag testing system based on virtual instrument |
| CN104700131B (en) * | 2015-03-09 | 2017-11-28 | 东南大学 | animal tag test system based on virtual instrument |
| CN105426584A (en) * | 2015-11-04 | 2016-03-23 | 中国电子科技集团公司第四十一研究所 | Virtual instrument-based signal simulation system and method |
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| CN105610530A (en) * | 2015-12-25 | 2016-05-25 | 航天恒星科技有限公司 | Satellite data acquisition and analysis method and system |
| CN106254009A (en) * | 2016-07-21 | 2016-12-21 | 北京航空航天大学 | A kind of Unmanned Aerial Vehicle Data Link test electromagnetic interference signal recurrence system and reproducing method |
| CN106254009B (en) * | 2016-07-21 | 2018-08-03 | 北京航空航天大学 | A kind of Unmanned Aerial Vehicle Data Link test electromagnetic interference signal recurrence system and reproducing method |
| CN107566067A (en) * | 2017-09-27 | 2018-01-09 | 四川省大见通信技术有限公司 | A kind of method with CW signal detections with frequency interport isolation |
| CN111030891A (en) * | 2019-12-24 | 2020-04-17 | 武汉中元通信股份有限公司 | Communication detection equipment calibration system and method based on pxi |
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