CN102298685B - 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 PDF

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CN102298685B
CN102298685B CN201110106606.XA CN201110106606A CN102298685B CN 102298685 B CN102298685 B CN 102298685B CN 201110106606 A CN201110106606 A CN 201110106606A CN 102298685 B CN102298685 B CN 102298685B
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frequency
signal
radio
instrument
parameter
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CN201110106606.XA
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CN102298685A (en
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高飞
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昆山启业检测校准技术有限公司
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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

Automotive electronic radio-frequency identification parameter detecting system based on virtual instrument
Technical field
The present invention relates to a kind of automotive electronic radio-frequency identification parameter detecting system based on virtual instrument, particularly relate to a kind of for the whether qualified automotive electronic radio-frequency identification parameter detecting system of RFID electronic tag on testing automobile.
Background technology
RFID communication system is more and more applied to all trades and professions, and especially the RFID communication system of RFT pattern with its low-power consumption, low cost, easily dispose feature, has occupied automotive electronics recognition technology main flow.RFT mode of operation refers to that card reader sends continual carrier wave (CW) signal as energy pumping signal to label, initiating communication, and label responds this excitation and feeds back reverse signal.Receive and dispatch separating of path with the RFID that is not both of traditional wireless communication mode maximum obviously, read write line transmitted signal is different with reception signal path.But different path loss needs different offsets, and this offset need to obtain by minute other path calibration.This special communication pattern needs 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 complete by universal instrument.These general purpose instruments can only be according to the technical Analysis signal that has formed standard on market, ISO/IEC14443 for example, ISO/IEC18000-2,3,4,5,6,7; ISO/IEC15693, the standards such as NFC are exactly some typical technology.And in 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, has been used the RFID signal of encrypting exactly.Under this situation, even also helpless for the simplest ASK and fsk signal general purpose instrument.
For automotive electronics RFID measuring system, instrument need to be carried out time-domain analysis, frequency-domain analysis, and separate mediation protocal analysis.This 4 large alanysis need to be carried out simultaneously, and analyze unlike signal standard simultaneously, virtual instrument has born advantage, because virtual instrument is different from intelligent instrument, intelligent instrument dependence is embedded to be preset with methods analyst program firmware, the program of virtual instrument is independent of hardware and exists, and utilizes VC, C++, Python, Scripts, the analysis tools such as Matlab are carried out, and instrument development personnel upgrading and expansion are only software works.At present virtual instrument is mainly used in industrial automation, for the detection system of communication and radio-frequency measurement, especially automotive electronic technology and technology of Internet of things RFID, also belongs to blank.
Therefore, existing instrument analysis technology, is limited to the feature of hardware clearly, the 125KHz that for example RFID technology of Internet of things is used, 13.56M, wait high frequency and ultrahigh frequency, also there is 925MHz, 2.4GHz, the radio frequency standard of frequency range, even also exists for microwave frequency bands such as radar 5.8GHz.Change a standard and often meaned that system will change hardware instrument, to test job, brought inconvenience.Improve the cost of test, made detection and measure in development and general company to can not get effectively carrying out and promoting, affected the quality of product.
In a word, current various RFID detection systems are all by increasing the complexity of general purpose instrument, by changing hardware instrument, meet the update of pure software upgrading and technical standard, isolated hardware and software algorithm relation between the two, inevitably there is certain limitation.Meanwhile, along with the development of automotive telematics technology, have more technical standard requirement, complete vehicle quality requirement, the application demand of detection system, existing scheme fails to provide an effective solution so far.
In sum, problem demanding prompt solution is to improve to current RFID detection system the shortcoming that is too limited to the dirigibility of hardware shortage to overcome it.
Summary of the invention
Technical matters to be solved by this invention is, a kind of automotive electronic radio-frequency identification parameter detecting system based on virtual instrument is provided, it has solved traditional function singleness while utilizing common bench instrumental analysis, the instrument kind that composition system needs is many, price is high, and networking is inconvenient, and instrument cubicle is difficult to synchronous and triggers, and existing firmware demodulation ability is limited, only solve conventional power and the weak points such as measurement of frequency.
For solving the problems of the technologies described above, basic conception of the present invention is: the combination (hereinafter referred to as " virtual instrument ") by software and hardware, completes the detection to RFID electronic tag by software and the mutual work compound of hardware.Particularly, utilize virtual instrument to substitute existing common bench instrument, the many standards that realize frequency range and hardware are compatible flexibly; By the original firmware method of software replacement, in code level, realize the signal analysis and processing support to standard; The multianalysis that realizes radio frequency identification signal by update software algorithm detects; Use the standard calibration and the self check definition that propose, the due precision of strict regulations virtual instrument and Repeatability.By above improvement, the detection needs that native system precision completely can be realistic have been guaranteed.
As a kind of technical scheme that realizes basic conception of the present invention, this is to adopt a kind of automotive electronics radio-frequency (RF) identification parameter detection method based on virtual instrument, and the method comprises the following 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 self check calibration;
Isolation check process: measure respectively the loss of read write line transmission path, the loss of read write line RX path, emitting antenna and receiving antenna isolation, measurement result is compared to judge that whether the radio frequency link overall isolation degree of system is qualified;
Detect and testing process: the receiving and transmitting signal of RFID radio-frequency (RF) identification is detected to 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 based on virtual instrument, in described self check calibration flow process, carry out successively following steps:
Software subsystem self integrity checking;
Software subsystem is communicated by letter with instrument control module, and instrument control module rreturn value is correct, carries out next step, otherwise mistake processing until by this step;
System output radio-frequency (RF) calibration signal, by switching over by transmission antennas transmit;
By switching over, by receiving antenna, receive signal to the receiver of system;
Emissive power is deducted to the signal power receiving and obtain isolation, be greater than 50dB and pass through, otherwise mistake processing until by this step;
In the described automotive electronics radio-frequency (RF) identification parameter detection method based on virtual instrument, in described isolation check process, carry out successively following steps:
RX path to electronic radio frequency identification radio frequency parameter system is calibrated, and the path loss of working frequency points is recorded as to 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 to L2;
Transmitted power and received power during to normal active configuration are calibrated, and the sending and receiving isolation of working frequency points is recorded as to L3;
Judge whether L1+L2<L3 sets up, if set up, isolation detects and passes through; Otherwise isolation is not up to standard, check system is also adjusted place, until above-mentioned isolation detects, passes through.
In the described automotive electronics radio-frequency (RF) identification parameter detection method based on virtual instrument, in described detection and testing process, carry out successively following steps: (1) gauge tap, works in antenna to transmit and receive the configuration of antenna; (2) according to the scope of the running parameter of tested RFID label, read write line parameter is set, read write line normally works in " identification " (making an inventory) state, and the recognition result of identifying continuously and return nominal to being arranged in RFID label on measured piece records and puts on record; (3) the zero groove of control instrument, arranges the parameter of sampling, and parameter comprises expectation power, centre frequency, and bandwidth, time span, sampling rate and overtime, controls radio frequency and Base Band Unit is worked under the parameter arranging by zero groove; (4) signal obtaining before timer expiry belongs to effective reception, and whether satisfied default from the time-domain sampling signal authentication length and the power that obtain, the satisfied system of returning to the 1st step inspection read write line and electronic tag composition is to guarantee that they are in normal work; (5) to sampled data analysis, first analyze time domain and frequency spectrum and frequency of operation, guarantee that sampled signal has comprised expectation instruction, and instruction meets normal frequency tolerance state, if can not normally analyze, return to the 3rd step inspection and debugging; (6) sampled data is analyzed to trial solution adjusting data according to required demodulation parameter, the demodulation parameter of separating timing comprises: data rate, modulation system, pilot frequency mode, data encoding, check code; (7) after demodulation, enter the protocol parameter analysis phase, to sampled data analysis instruction interval, instruction type and kind, and whether the MAC layer decoder of instruction is correct; (8) complete measurement Detection task, report that whether the RFID electronic tag of this test is by setting thresholding and standard.
A kind of automotive electronic radio-frequency identification parameter detecting system based on virtual instrument, this system comprises: modular instrument, emitting antenna, receiving antenna, measure antenna, measured piece, 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 is sent pumping signal and receives RFID label by receiving antenna to the RFID label at measured piece place 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, modular instrument carries out communication by communication bus cable and remote networking computing machine.
Described modular instrument in the described automotive electronic radio-frequency identification parameter detecting system based on virtual instrument comprises: rf receiver unit, ADC unit, DAC unit, rf transmitter unit, switch are controlled and communication unit.
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 form, system is by carrying out self check, and calibration, gathers, analyze, software automatically generates the functional steps such as whole process report and completes the radio frequency detection of RFID parts and measure; The present invention adopts virtual instrument technique to make detection system be applicable to detecting multiple REID standard signal; By the modularizations such as computer software and radio frequency and baseband sampling instrument is integrated, improved function and the efficiency of detection system.Further, native system has solved the standard format problem that traditional measurement instrument cannot be measured, and has expanded the signal analysis mode of instrument; Solved the signal analysis problem of virtual instrument in automotive electronics application, the algorithm of communication has been implanted to computing machine, thereby solved many standard demodulation of virtual instrument, analyzed, and the research and development checking such as statistics and the production line test demand manufactured.Further again, native system occurs and analyzes multimode synchronous operation by the signal of virtual instrument, has solved the path calibration problem that the expensive network analyzer of common needs just can complete.
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram that the present invention is based on the automotive electronic radio-frequency identification parameter detecting system of virtual instrument;
Fig. 2 is the arrangement plan that the present invention is based on the automotive electronic radio-frequency 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 electronic radio-frequency identification parameter detecting system calibration arrangements-transmission path of virtual instrument;
Fig. 4 is the schematic diagram of instrument sampled signal array format that the present invention is based on the automotive electronic radio-frequency identification parameter detecting system of virtual instrument;
Fig. 5 is the software flow pattern that the present invention is based on the automotive electronic radio-frequency identification parameter detecting system of virtual instrument.
Embodiment
For further disclosing technical scheme of the present invention, be hereby described with reference to the accompanying drawings embodiments of the present invention:
This part peace is set forth embodiments of the present invention according to following order, but based on identical inventive concept in the situation that, 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, 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.
Now by said sequence, be specifically described below:
[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 used to signal sending and receiving;
3. base band comprises ADC and DAC module, must be able to work, more than resolution reaches 14bit simultaneously; More than base-band digital sampling clock 40MHz, the sample of memory degree of depth is greater than 64Mb, and input range dynamic range is greater than 60dB, there is real-time Trigger Function, there is waveform memory function, and can carry out data transmission with LAN or usb protocol, or utilize quasi real time bus to control and communicate by letter;
4. switch matrix is realized the switching of internal radio frequency path, for robotization, controls, and switch, multiplexer and matrix, consists of;
Control circuit be responsible for and computing machine on measurement of virtual instrument software carry out punctual and duly communication, comprise trigger mode, incoming level, sampling rate, sampling length, filtering characteristic, signal condition, low noise amplification, attenuation function that module hardware is set, the optimum linear scope of the signal that makes to reach radio-frequency module in work, guarantees undistorted input;
6. computing machine is Long-distance Control, needn't be with measured piece in same place, because the testing environment of automotive electronics dangerous factor often comprises the 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 are in effective horizon range, and between path, nothing is covered and stops;
8. the minimum radio frequency isolation degree of the placement of emitting antenna and receiving antenna is 30dB, and situation must guarantee 55dB conventionally;
9. the placement direction of emitting antenna and receiving antenna must carry out space isolation to be greater than 30 degree angles, the antenna distance 30cm of being at least separated by;
10. emitting antenna and receiving antenna belong to high-gain and directive antenna, and 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 guarantee that position can measure and record.
Secondly, the radio frequency parameter measuring system of REID is carried out work according to specific flow process, to guarantee precision, and degree of stability, repeatability and tractability.Specifically, by process of self-test, calibrate flow process, and detection and testing process composition.Wherein, calibration flow process is the basis of all processes, concrete enforcement is realized by the signal delivery and reception module of hardware components, automatically controls virtual instrument module 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 meets 30dB by software.
[hardware configuration of test platform]
Fig. 1 is the one-piece construction schematic diagram that the present invention is based on the automotive electronic radio-frequency identification parameter detecting system of virtual instrument, figure 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, by emitting antenna 2, the RFID label to measured piece 5 places sends pumping signal and responds by receiving antenna 3 reception RFID labels the radiofrequency signal that this pumping signal is fed back modular instrument 1, simultaneously modular instrument 1 is caught pumping signal and the RFID label that the transmitting-receiving radiofrequency signal of above-mentioned RFID label send to RFID label and is responded the radiofrequency signal that this pumping signal is fed back by measuring antenna 4, modular instrument 1 carries out communication by communication bus cable 8 and remote networking computing machine 6.Particularly, described modular instrument 1 comprises: rf receiver unit, ADC unit, DAC unit, rf transmitter unit, switch are controlled and communication unit.
Detection system of the present invention is by the combination of 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 completed the detection of RFID electronic tag is judged to whether tested RFID electronic tag is qualified.Concrete testing process will be described in detail in following part.
[workflow of system equipment]
Native system equipment is divided in the course of the work:
Self check calibration flow process;
Isolation checks;
Detect and test.
Whether above-mentioned three parts are qualified in order to judge the radio frequency link overall isolation degree of system, on qualified basis, the receiving and transmitting signal of RFID radio-frequency (RF) identification detected to analysis.
Concrete objective for implementation and the operating process of these 3 flow processs are described respectively below.
Self check calibration flow process for object respectively successively:
Software subsystem;
PXI or LXI virtual instrument control module, be generally zero groove unit;
Baseband circuit, ADC, DAC unit;
Radio frequency and frequency changer circuit unit;
Calibration flow process is:
1. software subsystem self integrity checking;
2. software subsystem is communicated by letter with virtual instrument control module, and instrument rreturn value is for correctly carrying out next step, otherwise mistake processing until by this step;
3. system output radio-frequency (RF) calibration signal, by switching over by transmission antennas transmit;
4. by switching over, by receiving antenna, receive signal to the receiver of system;
5. emissive power is deducted to the signal power receiving and obtain isolation, be greater than 50dB and pass through, otherwise mistake processing until 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 electronic radio-frequency 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 electronic radio-frequency identification parameter detecting system calibration arrangements-RX path of virtual instrument, and concrete operations flow process is:
1. according to " automotive electronics radio-frequency (RF) identification radio frequency parameter system calibration configuration-RX path " arrangement plan of Fig. 2, calibrate, the path loss of working frequency points is recorded as L1;
2. according to " automotive electronics radio-frequency (RF) identification radio frequency parameter system calibration configuration-transmission path " arrangement plan of Fig. 3, calibrate, the path loss of working frequency points is recorded as L2;
3. according to the normal active configuration figure of Fig. 1, calibrate, the sending and receiving isolation of working frequency points is recorded as L3;
4. check whether L1+L2<L3 sets up, if set up, illustrate that the signals leakiness that sent by transmitting terminal is less than to the radiofrequency signal of receiving end the radiofrequency signal that measured object reflects, detection is passed through, by this committed step, guarantee the correctness of method of testing and the degree of accuracy of result, otherwise the isolation L1+L2<L3 of being not up to standard is false, now check system adjust place, is upper until meet above-mentioned formula.Supplementary notes be that this step has been considered antenna gain, and think that the antenna gain of label is 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;
The control module of radio frequency reception instrument;
Radio frequency reception instrument;
Software analysis module.
According to following steps order, carry out the processing of radiofrequency signal, analyze and measure:
1. utilize software control switch, antenna is worked in transmit and receive the configuration of antenna;
2. according to the scope of the running parameter of tested label, typical read write line parameter is set.Read write line normally works in " identification " (making an inventory) state, and the recognition result of identifying continuously and return nominal to being arranged in electronic tag on automobile records and puts on record;
3. the zero groove of software control instrument, arranges the parameter of sampling, and parameter comprises expectation power, centre frequency, and bandwidth, time span, sampling rate and overtime, controls radio frequency and Base Band Unit is worked under the parameter arranging by zero groove;
4. the signal obtaining before timer expiry belongs to effective reception, from the time-domain sampling signal authentication length obtained and power, whether meet default, do not meet return System Assurance that the first step checks that read write line and electronic tag form they in normal work;
5. by software, sampled data is analyzed, first analyzed time domain and frequency spectrum and frequency of operation, guarantee that sampled signal has comprised expectation instruction, and instruction meets normal frequency tolerance state, if can not normally analyze, return to the 3rd step inspection and debugging;
6. pair sampled data is analyzed trial solution adjusting data, by searching algorithm software, automatically finds demodulation parameter, data rate for example, and modulation system, pilot frequency mode, data encoding, the parameters such as check code, these all will be realized by this detection system software;
7. after demodulation, enter the protocol parameter analysis phase, to sampled data analysis instruction interval, instruction type and kind, and whether the MAC layer decoder of instruction is correct;
8. complete measurement Detection task, output report, software reports that whether the electronic tag of this test is by setting thresholding and standard automatically.
Above the 4th step is all software function later, these functions are by a radio frequency, agreement and signaling software module realize, particularly, this software module is carried out each side analysis according to the definition of standard (such as 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 for Design of native system has following characteristic to guarantee function and the performance of " automotive electronic radio-frequency identification parameter detecting system based on virtual instrument ":
1. the punctual and duly communication of authenticating computer and virtual instrument hardware module, is realized as similar ping instruction by closed-loop communication;
2. check hardware effort state, particularly, such as whether front end is saturated, whether base band overflows, and whether parameter setting and reading back coincide;
3. pre-service: the IQ vector signal obtaining is processed, guaranteed that subsequent operation is feasible.For comprising interference, low-frequency ripple, fluctuation, direct current, can do filtering and process.The most simply that iq data filtering DC component and low frequency component are processed; Select the filter order of suitable band edge steepness and Out-of-band rejection to carry out; Retain variation and the details of RFID signal, only remove its DC power, so after filtering, signal can not calculate radio-frequency power.The code check of RFID forward signal is 26.7K-128Kbps, so filtering cutoff frequency can be selected 2.6KHz; The data transfer rate 40K-640Kbps of reverse link signal, symbol rate 40K-5.12Msps, 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 FIR wave filter is preferential;
4. survey: feature judges whether RFID signal occurs.For training detuner, must ask for decision threshold according to measured signal.Particularly, according to actual performance, survey this one-phase and be output as decision threshold level, can consider to process together in conjunction with burst location;
5. burst Burst locates: all target analysis instructions that intercept and capture search volume.(forward direction, oppositely) because of uncertain relative phase relation between existence and carrier wave, signal section therefore need to happen suddenly detection.This step 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 larger, 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 compared with the low 2.7dB of carrier wave, and oppositely compared with the large 2.5dB of carrier wave.In 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; 2 times of b.Yi Ci unit overall signal is divided to stack cut apart that (in fact the first half that is next section is exactly the later half of leading portion, be shown in Fig. 4 11,12,13 signal subsection), be made as-this section of N section (hide hypothesis-signal entire length be greater than 2 times of minimal detection period) the most key; C. this N value is carried out to sort, relatively, and sequence; 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 occur burst, the suspicious paragraph of mark, can have a plurality ofly, default maximum demodulation support is 128 burst for example; F. utilize appropriate Cycle Length, search window, comparison threshold, obtains burst position.Above step is Rough Inspection, and parameter can fine tuning;
6. screen: further determine whether instruction.Comprise signal section and generally roughly can drop in 2 sections of detection windows, at this moment need the window in above-mentioned steps to be reduced to the length of minimum symbol period, carry out not overlapping retrieval, find the true rising of signal, the position of decline section, records.Check whether signaling zone segment length and target setting mate, if all pass through, next separate to be in harmonious proportion and measure;
7. front reverse differentiation: supposition only needs at forward direction with while 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 contrast: the first step, by the time location of signal, adjust back original iq data, if find following information, think backscattered signal: it is also that the amplitude integration of signal is greater than carrier amplitude slightly that amplitude is positioned on carrier wave, if the depth of modulation >95% of discovery signals thinks for forward direction PRASK signal;
8. demodulation: the aforementioned result searching is numbered with reverse according to forward direction respectively, deposit temporarily, forward signal calls forward direction demodulating algorithm, reverse signal calls reverse demodulating algorithm, the bit accuracy that inspection demodulates, check logical mistake rate in demodulation, make mistakes and surpass to a certain degree, change parameter demodulation or the demodulation again of change direction again.In addition, according to agreement, by MAC layer information, first detect forward direction query instruction, obtain carrying out reverse demodulation after reverse physical layer configuration, this is applicable to ISO18000-6C system;
9. make mistakes and process: be divided into Physical layer make mistakes and MAC layer make mistakes.Although Physical layer represents that some bit is incorrect, major part can be correctly demodulated, and the bit demodulation after incorrect bit can recover normally, the distortion causing such as burr and overshoot etc., and this cannot solve by self.MAC makes mistakes such as situations such as CRC are not inconsistent, considers the conflict of reflex time simultaneously of many labels, and this also can be identified by judgement lead code, but this situation cannot be accomplished demodulation simultaneously, unless there are more inputs;
10. signal imprinting: each is able to the instruction of correct demodulation, all will be with its physical layer parameter of symbol record and the MAC parameter of each demodulation.Physical layer comprise 1. 2. fall times 3. of rise time symbol lengths 4 .PW 5. dutycycle 6. high level ON amplitude 7. low level OFF amplitude 8. data rates 9. initial time 10. the time of the previous order fulfillment of the same type of time 15. distance of the previous order fulfillment of the negative overshoot of the positive overshoot 13. of termination time 11. persistence length 12. 14. distance; MAC layer parameter only has instruction just to have, comprise: 1. Delimiter length 2. Tari 3. TRCAl 4. RTCal 5. TRext 6. pilot tone mode 7. CRC whether consistent 8. have or not error code 9. have or not the logic error PHY layer of timing (separate abnormal) 10. oppositely or forward direction 11. instruction names claim a criterion 12. each parameter results 13 that – can be used as demodulation success or not. have and do not have to adjudicate phenomenon, in reverse tail.In sum, Physical layer just comprises 15 parameters, and MAC layer comprises 13 parameters.The demodulation result of MAC can be as next step protocal analysis process;
11. results outputs: with figure, the modes such as word or form by said process and result presentation 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 electronic radio-frequency 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: software self check; Equipment Alignment; Environment calibration, sampling; Measure; Fault handling.
Particularly, 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 driving, program will operate in pure software mode, 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, by drivings such as LXI, read its error status, 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 environment calibration utilizes above-mentioned " inspection of calibration and isolation " part to mention is realized, and guarantees that forward path loss and reverse path loss stack are greater than the minimum requirements of isolation;
Sampling element is initiated by software, requires hardware to sample, hardware return results or overtime after, software checks data, if find to have signal instruction to be analyzed in data, enters measurement entity; And if result data is incorrect, exceed standard, overtime, or do not comprise any signal instruction that can analyze, 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];
" front 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 completing has " time domain measurement ", " frequency domain measurement ", " demodulation measurement ", " signalling analysis " 4 major parts, these several parts are progressive, to obtain the physical layer parameter of measured signal and the content of MAC agreement, help user's orientation problem reason;
Fault handling partly will be pointed out problem place to software operation person, and offers help and how to recover the proper operation environment of software.
By adopting technique scheme, the invention solves the standard format problem that traditional measurement instrument cannot be measured, expanded the signal analysis mode of instrument; Solve the signal analysis problem of virtual instrument in automotive electronics application simultaneously, the algorithm of communication has been implanted to computing machine, thereby solved the research and development checkings such as many standard demodulation, analysis and statistics of virtual instrument and the production line test demand of manufacturing.And native system is by signal generation and the synchronous operation of analysis multimode of virtual instrument, has solved the path calibration problem that the expensive network analyzer of common needs just can complete.
More than, by description of listed embodiment, the basic ideas and basic principles of the present invention have been set forth.But the present invention is never limited to above-mentioned listed embodiment, every equivalent variations of doing based on technical scheme of the present invention, improvement and deliberately become of inferior quality behavior, all should belong to protection scope of the present invention.

Claims (2)

1. the automotive electronics radio-frequency (RF) identification parameter detection method based on virtual instrument, is characterized in that, the method comprises the following 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 self check calibration;
In described self check calibration flow process, carry out successively following steps:
Software subsystem self integrity checking;
Software subsystem is communicated by letter with instrument control module, and instrument control module rreturn value is correct, carries out next step, otherwise mistake processing until by this step;
System output radio-frequency (RF) calibration signal, by switching over by transmission antennas transmit;
By switching over, by receiving antenna, receive signal to the receiver of system;
Emissive power is deducted to the signal power receiving and obtain isolation, be greater than 50dB and pass through, otherwise mistake processing until by this step;
Isolation check process: measure respectively the loss of read write line transmission path, the loss of read write line RX path, emitting antenna and receiving antenna isolation, measurement result is compared to judge that whether the radio frequency link overall isolation degree of system is qualified;
In described isolation check process, carry out successively following steps:
RX path to electronic radio frequency identification radio frequency parameter system is calibrated, and the path loss of working frequency points is recorded as to 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 to L2;
Transmitted power and received power during to normal active configuration are calibrated, and the sending and receiving isolation of working frequency points is recorded as to L3;
Judge whether L1+L2<L3 sets up, if set up, isolation detects and passes through; Otherwise isolation is not up to standard, check system is also adjusted place, until above-mentioned isolation detects, passes through;
Detect and testing process: the receiving and transmitting signal of RFID radio-frequency (RF) identification is detected to analysis, to judge that whether tested RFID label is by setting thresholding and standard;
In described detection and testing process, carry out successively following steps: (1) gauge tap, works in antenna to transmit and receive the configuration of antenna; (2) according to the scope of the running parameter of tested RFID label, read write line parameter is set, read write line normally works in " identification " state of making an inventory, and the recognition result of identifying continuously and return nominal to being arranged in RFID label on measured piece records and puts on record; (3) the zero groove of control instrument, arranges the parameter of sampling, and parameter comprises expectation power, centre frequency, and bandwidth, time span, sampling rate and overtime, controls radio frequency and Base Band Unit is worked under the parameter arranging by zero groove; (4) signal obtaining before timer expiry belongs to effective reception, and whether satisfied default from the time-domain sampling signal authentication length and the power that obtain, the satisfied system of returning to the 1st step inspection read write line and electronic tag composition is to guarantee that they are in normal work; (5) to sampled data analysis, first analyze time domain and frequency spectrum and frequency of operation, guarantee that sampled signal has comprised expectation instruction, and instruction meets normal frequency tolerance state, if can not normally analyze, return to the 3rd step inspection and debugging; (6) sampled data is analyzed to trial solution adjusting data according to required demodulation parameter, the demodulation parameter of separating timing comprises: data rate, modulation system, pilot frequency mode, data encoding, check code; (7) after demodulation, enter the protocol parameter analysis phase, to sampled data analysis instruction interval, instruction type and kind, and whether the MAC layer decoder of instruction is correct; (8) complete measurement Detection task, report that whether the RFID electronic tag of this test is by setting thresholding and standard.
2. the automotive electronic radio-frequency 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 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, modular instrument (1) carries out communication by communication bus cable (8) and remote networking computing machine (6), described modular instrument (1) comprising: rf receiver unit, ADC unit, DAC unit, rf transmitter unit, switch are controlled and communication unit.
CN201110106606.XA 2011-04-27 2011-04-27 Automotive electronic radio-frequency identification parameter detecting system based on virtual instrument CN102298685B (en)

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