A kind of device and method for testing RFID sensitivityTechnical field
The present invention relates to the research and development of UHF reader or the applied technical field of production line measurement sensitivity, specially a kind of surveysTry the device and method of RFID sensitivity.
Background technique
Ultra-high-frequency passive radio-frequency recognition system is generally by reader, antenna, passive label composition.Research and development or production line productionThe receiving sensitivity of test reader is required in the process, thus clear equipment performance, refering to fig. 1.
Receiving sensitivity refers to the receiver minimum that receiver input terminal need to input in the case where meeting certain error rate conditionSignal level.In practical research and development or production process, signal source simulation electronic label is used, usually by adjusting power and computer statisticsThe bit error rate, the reversed receiving sensitivity of test equipment.In addition it is also possible to carrier wave is modulated by RF switch by FPGA or MCU,Simulation electronic label.Regardless of test method, the real scene of true tag backscattering can not be all simulated, and ifInfluence before having ignored to leakage to reversed sensitivity also results in test data inaccuracy.Therefore, it is necessary in response to this,A kind of closer true application scenarios are developed, more accurate test method is tested.
Chinese invention patent 200910193540.5 (applying date: on October 30th, 2009) discloses a kind of test RFID and readsRead the method and its equipment of device receiving sensitivity.Test method includes reader transmitting local oscillator carrier signal, while listening to labelThe local oscillator carrier signal of answer signal, reader transmitting is input to first annular device after being reflected by an obstacle, and first annular device is defeatedSend local oscillator carrier signal to tag responses signal simulator, tag responses signal simulator is modulated local oscillator carrier signal,Decaying and function point processing, generate power equal first via tag analog signal and the second road sign label analog signal, the first road signAnalog signal input power meter is signed, the second road sign label analog signal inputs the first annular device, first annular device input secondRoad sign label analog signal is to the receiving end of reader.Its test equipment includes reader, first annular device, tag responses signal modeQuasi- device and power meter.The technical program can accurately, quickly and easily test the receiving sensitivity of RFID reader.The inventionMeasurement sensitivity method is to simulate label returned data by modulation carrier wave, and there are errors with physical tags return signal, cannotTrue and accurate reflects actual conditions.
Chinese invention patent ZL 201010148006.5 (applying date: on 04 09th, 2010) discloses a kind of radio frequency knowledgeOther reader remotely testing receiver sensitivity method and apparatus, technical problems to be solved are to monitor the reception of RFID readerSensitivity.Method of the invention, comprising the following steps: signal source exports a frequency values, and data stream generation unit generates data flowAnd it is encoded, after modulation amplification, oriented coupler to receiving unit, amplification demodulation reverts to connecing for coded formatNumeric data code is received, error rate calculation judging unit compares it with initial data code, calculates the bit error rate.The device of the invention is equipped withCenter processor, the transmitting unit and receiving unit being connect with center processor.Compared with prior art, the present invention utilizing read-writeDevice generates test signal, and the sensitivity technique for carrying out the machine timing or being initiated by remote control method, from surveying, the time is short, can make remoteProcess control side determines the working condition of reader at any time, realizes radio-frequency identification reader/writer sensitivity remote real-time monitoring.The hairIt send through winding on-line checking sensitivity situation, it can not true measurement sensitivity although convenient.
To sum up, sensitive using signal source test reader for the method for RFID sensitivity test in currently available technologyDegree, it is not only expensive, but also be not suitable for production line and build multiple test station demands.In addition, sending specific letter with signal sourceNumber simulation stamp methods measurement sensitivity, the data tested out do not account for before to influence of the leakage to sensitivity, also can not mouldQuasi- reality, which reversely solves adjusting data according to agreement, climbing problem, and then can not real embodiment reader sensitivity.
Summary of the invention
The purpose of the present invention is to provide a kind of device and method for testing RFID sensitivity, the more inexpensive tests of useScheme more really, accurately tests reader receiving sensitivity, can substitute expensive test equipment, is more suitable for research and development or rawProducing line concurrent testing occasion, to solve the problems mentioned in the above background technology.
To achieve the above object, the invention provides the following technical scheme: a kind of device for testing RFID sensitivity, including electricityBrain, ultrahigh frequency readers to be tested and test fixture；The computer, ultrahigh frequency readers to be tested and test fixture pass through etherNetwork interface or RS232 interface communication connection；
The computer counts the sensitivity under specific bit error rate for starting sensitivity test；
It is connected between the ultrahigh frequency readers to be tested and test fixture by radio frequency line, ultrahigh frequency readers to be testedOrder and carrier wave are checked according to the transmission of hyperfrequency agreement, the UHF chips bound on test fixture are replied according to decoded orderRandom number or EPC encoded information or TID information.
The test fixture can dynamically set the threshold of sensitivity of working plate transmitting, according to research and development or production line requirementFlexible configuration, test fixture by switch matrix, first order circulator, coupler, second level circulator, ultrahigh-frequency tag chip,Numerical-control attenuator and power detecting unit composition.
Preferably, the ultrahigh frequency readers to be tested send carrier wave and forward signal, before waking up label and sendingTo order, while ultrahigh frequency readers to be tested are opened reversed receive and are switched, monitor the letter that label returns according to protocol requirementNumber, forward direction checks order according to agreement transmission.
Preferably, it is connected between the ultrahigh frequency readers to be tested and test fixture by radio frequency line, if to be tested superHigh frequency reader has multiple antenna ports, and test fixture supports multiple antenna port sensitivity tests by switch matrix.
Preferably, the test fixture receives before reader to order, returns after resolve command and checks data.
Preferably, the test fixture receives before reader to order, forward direction order successively pass through circulator, coupler,PI decays link, and forward power reaches UHF chips by decaying, UHF chips successfully parse it is preceding to after order, according to associationView returns to random number or label information area data.
Preferably, the carrier wave that the label emits ultrahigh frequency readers to be tested is modulated, modulated signal processMatch, controllable attenuation device pours into the antenna port of ultrahigh frequency readers to be tested through circulator.
Preferably, the energy size of the ultrahigh frequency readers antenna port to be tested is configurable, and computer is connect by EthernetMouth or RS interface configure test fixture return signal energy size, realize that dynamic adjusts the sensitive of ultrahigh frequency readers to be testedDegree.
Preferably, the test fixture is returned to the energy size adjustable of ultrahigh frequency readers to be tested, and calibrating mode is logicalCrossing software configuration can choose FM coding or MILLER coding.
The present invention provides another technical solution are as follows: a method of test RFID sensitivity, comprising the following steps:
S1: ultrahigh frequency readers to be tested first send single carrier according to hyperfrequency agreement, sending window, survey for activatingThe ultra-high-frequency passive chip that trial work is loaded onto；
S2: ultrahigh frequency readers to be tested send before to checking order, tag resolution is to preceding to after order, backscattering tuneCarrier wave processed exports reverse data；
S3: in the information for receiving window reception test fixture and returning of ultrahigh frequency readers to be tested, if to be tested superThe EPC code or TID that high frequency reader energy unsuccessful demodulation tag decoder returns, then it is assumed that this sensitivity test passes through, and otherwise recognizesFor this test crash.
Compared with prior art, the beneficial effects of the present invention are:
The device and method of this test RFID sensitivity can be tested effectively compared with prior art with signal source in solutionIt is expensive, the problem of unsuitable production line builds multiple test station demands；In addition, tradition sends signal specific with signal sourceStamp methods measurement sensitivity is simulated, the data tested out do not account for the preceding influence to leakage to sensitivity, can not simulate yetThe practical adjusting data that reversely solves according to agreement has a climbing problem, so can not real embodiment reader sensitivity, the present invention is using moreThe testing scheme of low cost more really, accurately tests reader receiving sensitivity, can substitute expensive test equipment, moreIt is suitble to research and development or production line concurrent testing occasion.
Detailed description of the invention
Fig. 1 is traditional test sensitivity system block diagram；
Fig. 2 is measurement sensitivity system block diagram of the present invention；
Fig. 3 is test fixture functional block diagram of the present invention.
In figure: 1 computer, 2 ultrahigh frequency readers, 3 test fixtures, 4 Ethernet interfaces or RS232 interfaces to be tested, 5 radio frequenciesLine.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, completeSite preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based onEmbodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every otherEmbodiment shall fall within the protection scope of the present invention.
Embodiment 1:
Please refer to Fig. 2-3, a kind of device for testing RFID sensitivity, including computer 1,2 and of ultrahigh frequency readers to be testedTest fixture 3；Computer 1, ultrahigh frequency readers to be tested 2 and test fixture 3 are communicated by Ethernet interface or RS232 interface 4Connection；
Wherein, computer 1 is for starting sensitivity test, and counts the sensitivity under specific bit error rate；Superelevation to be testedIt is connected between frequency reader 2 and test fixture 3 by radio frequency line 5, ultrahigh frequency readers 2 to be tested are sent according to hyperfrequency agreementOrder and carrier wave are checked, the UHF chips bound on test fixture 3 reply random number according to decoded order or EPC is encodedInformation or TID information；Test fixture 3 can dynamically set the threshold of sensitivity of working plate transmitting, according to research and development or production lineIt is required that flexible configuration, test fixture 3 is by switch matrix, first order circulator, coupler, second level circulator, ultrahigh-frequency tagChip, numerical-control attenuator and power detecting unit composition.
When work, ultrahigh frequency readers 2 to be tested send carrier wave and forward signal, for waking up label and sending preceding to lifeIt enables, while ultrahigh frequency readers to be tested 2 are opened reversed receive and switched, monitor the signal that label returns according to protocol requirement, spiritWhen sensitivity is tested, forward direction checks order according to agreement transmission, the random number and label information that tag decoder returns under normal circumstancesArea's data, while receiving above- mentioned information, then it is assumed that this time otherwise successfully decoded then records this and checks unsuccessfully；Superelevation to be testedIt is connected between frequency reader 2 and test fixture 3 by radio frequency line 5, if ultrahigh frequency readers to be tested 2 have multiple antenna ports, is surveyedTrial work fills 3 and supports multiple antenna port sensitivity tests by switch matrix；To order, parsing before the reception reader of test fixture 3It is returned after order and checks data.
Wherein, to order before the reception of test fixture 3 reader, its main feature is that circulator, coupling are successively passed through in forward direction orderDevice, PI decay link, and forward power reaches UHF chips by decaying, and UHF chips successfully parses preceding to after order, meetingRandom number or label information area data are returned to according to agreement, scattering energy size with Forward receiving ability has relationship；Label pairThe carrier wave that ultrahigh frequency readers 2 to be tested emit is modulated, and modulated signal is filled through overmatching, controllable attenuation device through circulatorEnter the antenna port of ultrahigh frequency readers 2 to be tested, the energy size of 2 antenna port of ultrahigh frequency readers to be tested is configurable, computer 13 return signal energy size of test fixture is configured by Ethernet interface or RS232 interface 4, it is to be tested super to realize that dynamic adjustsThe sensitivity of high frequency reader 2；Test fixture 3 is returned to the energy size adjustable of ultrahigh frequency readers 2 to be tested, due to toolingRadio-frequency devices discrete type and UHF chips albedo size are also different on plate, need to calibrate return by reference instrumentEnergy, thus guarantee reflect signal it is precisely consistent, calibrating mode by software configuration can choose FM0 encode or MILLERCoding, so that the signal for guaranteeing the working plate transmitting on different test fixtures 3 is that standard is consistent.
Embodiment 2:
1 description based on the above embodiment, the present invention provide another embodiment are as follows: a kind of side for testing RFID sensitivityMethod, comprising the following steps:
Step 1: ultrahigh frequency readers 2 to be tested first send single carrier according to hyperfrequency agreement, sending window, it is used forActivate the ultra-high-frequency passive chip on test fixture 3；
Step 2: ultrahigh frequency readers 2 to be tested send before to checking order, tag resolution is to preceding to after order, reverselyScattering modulation carrier wave, exports reverse data；
Step 3: in the information for receiving window reception test fixture 3 and returning of ultrahigh frequency readers 2 to be tested, if toTest EPC code or TID that 2 energy unsuccessful demodulation tag decoder of ultrahigh frequency readers returns, then it is assumed that this sensitivity test passes through,Otherwise it is assumed that this test crash.
Wherein, for ultrahigh frequency readers 2 to be tested according to hyperfrequency agreement, forward direction, which is first sent, obtains random number order, ifUltrahigh frequency readers 2 to be tested can normally receive the random number of the return of test fixture 3 and verification passes through, then then send and obtainThe forward direction order of EPC code or TID, the data that demodulating and decoding test fixture 3 returns, finally provides success or failure mark；IfVerification failure, then record epicycle test crash；Moreover, 2 forward power size of ultrahigh frequency readers to be tested can be according to realityApplication scenarios power setting can also require flexible setting according to research and development, thus to leakage signal to be tested super before consideringThe influence of 2 sensitivity of high frequency reader, utmostly close to practical application scene.
In summary: it is provided by the invention it is a kind of test RFID sensitivity device and method compared with prior art canIt solves the problem of to build multiple test station demands with the expensive unsuitable production line of signal source testing cost with effective；In addition, passingSystem with signal source send signal specific simulate stamp methods measurement sensitivity, the data tested out do not account for before to leakage to spiritThe influence of sensitivity, can not also simulate the practical adjusting data that reversely solves according to agreement has climbing problem, and then can not real embodiment readingDevice sensitivity, the present invention use more inexpensive testing scheme, more really, accurately test reader receiving sensitivity, energyExpensive test equipment is substituted, research and development or production line concurrent testing occasion are more suitable for.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and itsInventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.