CN101931472A - Benchmark test system and method for adjacent channel interference resisting capacity of RFID reader-writer - Google Patents
Benchmark test system and method for adjacent channel interference resisting capacity of RFID reader-writer Download PDFInfo
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Abstract
The invention relates to benchmark test system and method for adjacent channel interference resisting capacity of an RFID (Radio Frequency Identification Device) reader-writer. The benchmark test system comprises a standard test environment, a reader transmitting antenna, a signal source transmitting antenna, a receiving antenna, an RFID, a reader antenna bracket, a signal source antenna bracket, a receiving antenna bracket, a reader-writer to be tested, a signal source, a frequency spectrum analyzer and a control computer. In the method, an adjacent channel interference signal is simulated by artificially applying an RFID reader-writer with controllable power and frequency to account the maximum adjacent channel interference strength under an acceptable reading rate so as to evaluate the adjacent channel interference resisting capacity of the RFID reader-writer scientifically and repeatedly; and under the same acceptable reading rate, the stronger the adjacent channel interference, the stronger the adjacent channel interference resisting capacity of the reader-writer to be tested. The reading rate of the reader-writer is tested by simulating the adjacent channel interference of the RFID reader-writer, therefore, the invention provides a simple, accurate and effective RFID automatic testing tool and a benchmark testing method for a user.
Description
Technical field
The present invention relates to the RFID technical field, relate in particular to a kind of system and method that the rfid interrogator adjacent channel interference resisting capacity is carried out benchmark test.
Background technology
The RFID full name is radio-frequency (RF) identification (Radio Frequency Identification), is a kind of non-contact automatic identification technology that utilizes radio-frequency technique to realize.The RFID label has that volume is little, read or write speed is fast, shape is various, long service life, reusable, memory capacity big, can penetrate characteristics such as non-conductive material, can realize multiple target identification and moving target identification in conjunction with rfid interrogator, further tracking by can also realizing article in the global range with combining of Internet technology and information is shared.The RFID technology is applied to industries such as logistics, manufacturing, public information service, can significantly improve management and operational paradigm, reduces cost.
The RFID technology has become the focus of IT field at present, and numerous mechanisms and enterprise are all wideling popularize this technology.Along with the develop rapidly of RFID technology, the manufacturer of Related product increases gradually, and to fixed, the kind of rfid interrogator has also risen to hundreds of from hand-hold type, and is constantly releasing new product.In order in numerous rfid interrogators, to select can satisfy the product of user's demand, just need carry out special test to the performance index of RFID product, the rfid interrogator adjacent channel interference resisting capacity promptly is one of important performance indexes of rfid interrogator product.The rfid interrogator adjacent channel interference resisting capacity is meant under many read write lines or intensive read write line environment, disturb the size that influences from the electromagnetic signal of neighboring trace to read write line read rate to be measured, under the identical read rate, can accept that monkey chatter is strong more just to illustrate that the adjacent channel interference resisting capacity of this read write line to be measured is strong more.
As everyone knows, during RFID under on a large scale uses, as RFID visitor's positioning control system of in park or museum, disposing in order to prevent the visitor to wander away, in order not stay the dead angle in the zone that guarantees to follow the tracks of as far as possible, just need rfid interrogator can read the RFID label in any place in the bigger scope, must dispose a plurality of read write lines for this reason.The RFID hardware device be on the increase the covering area overlapping that causes some read write line possibly, produce the read write line conflict, even therefore influence the impact of performance of whole rfid system.Because read write line adopts frequency hopping communications more, promptly Fa She carrier wave changes by the random jump sequence of certain rule, point out in " 800/900MHz frequency range radio-frequency (RF) identification (RFID) the technology application specifies (trying) " of issue on April 20th, 2007 as China, the concrete frequency of utilization of 800/900MHz band RFID technology is 840.125-844.875MHz and each 20 frequency hopping frequency of 920.125-924.875MHz, therefore the read write line conflict mode under many read write lines or the intensive read write line environment mainly shows as monkey chatter, promptly a read write line is in certain channel (can be described as main channel) work, near another read write line also in the adjacent channel work of this main channel or main channel, and cause the Communication Jamming of interchannel.Under many read write lines or intensive read write line environment,, therefore the adjacent channel interference resisting capacity of read write line is carried out benchmark test and be necessary because this conflict can take place inevitably.
The purpose of benchmark test is by method of testing reasonable in design, testing process and testing tool a certain performance index of one class testing object to be tested, and guarantees that result that test obtains is comparable, repeatably.Use reference test method that the adjacent channel interference resisting capacity of rfid interrogator is tested, not only can directly obtain the read rate performance of a rfid interrogator product when main channel and adjacent channel are interfered, can also be by comparing with the adjacent channel interference resisting capacity of other rfid interrogator product, pick out under many read write lines or intensive read write line environment the more read write line product of steady operation.
At present the poor performance dissident of rfid interrogator product under many read write lines or intensive read write line environment caused many concerns both at home and abroad.In order to reduce this influence as far as possible, EPCGLOBAL has stipulated to launch template under many read write lines and the intensive read write line environment in its Class1 Gen2 UHF RFID communication protocol specially, as under many read write lines environment, when read write line was operated in certain main channel, the outer scattering transmission power of the band of its first neighboring trace was less than more than the main channel transmitting power 20dB at least; And the requirement under intensive read write line environment is more harsh, and the outer scattering transmission power of the band of its first neighboring trace is less than more than the main channel transmitting power 30dB at least.But this only is a kind of active constraint to read write line manufacturer, can not be used for estimating the performance performance difference of read write line under complex electromagnetic environment.In addition, also have special mechanism for testing application scenarios that is virtually reality like reality to set up test environment, preestablish dozens of read write line deployment point, be installed in the read write line of different manufacturers on these aspects after, again read write line read effect evaluation.Yet this method only is qualitatively a kind of and analysis non-quantitation, in case application scenarios or deployment point change, test result will be no longer suitable.
Summary of the invention
In order to provide the rfid interrogator adjacent channel interference resisting capacity is efficiently tested technology and the method for being badly in need of, the objective of the invention is provides a kind of simple, clear and effective automated test tool and reference test method for the user, but in order under repeat condition, to estimate fast the antijamming capability that a rfid interrogator is shown when main channel and neighboring trace are subjected to external disturbance, thereby for user's lectotype selection provides decision references, for this reason, the invention provides a kind of Benchmark test system and method for rfid interrogator adjacent channel interference resisting capacity.
For reaching described purpose, the Benchmark test system of rfid interrogator adjacent channel interference resisting capacity provided by the invention and method, its principle is that the people applies controlled electromagnetic interference signal and affacts on the signal of read write line to be measured in ideal space, obtain read rate by the number of times of repeatedly testing the correct demodulation RFID of read write line to be measured label inverse signal, under the identical read rate, can accept that monkey chatter is strong more just to illustrate that the adjacent channel interference resisting capacity of this read write line to be measured is strong more.
First aspect present invention, a kind of Benchmark test system of rfid interrogator adjacent channel interference resisting capacity is provided, it is characterized in that: comprise the standard testing environment, the read write line transmitting antenna, the signal source transmitting antenna, reception antenna, electronic tag, the reading and writing device antenna support, the signal source antenna holder, the reception antenna support, read write line to be measured, signal source, spectrum analyzer, the control computer, read write line transmitting antenna wherein, the signal source transmitting antenna, reception antenna, electronic tag, the reading and writing device antenna support, the signal source antenna holder, reception antenna props up the inside that is placed on the standard testing environment, read write line to be measured, signal source, spectrum analyzer, the control computer places the outside of standard testing environment, the read write line transmitting antenna places on the reading and writing device antenna support, the signal source transmitting antenna places on the signal source antenna holder, reception antenna is opposite on the reception antenna support mutually with electronic tag, reception antenna is positioned over the center of the radiating surface geometric center position line of read write line transmitting antenna and signal source transmitting antenna, read write line transmitting antenna and read write line to be measured, signal source transmitting antenna and signal source, link to each other by radio frequency feed line respectively between reception antenna and the spectrum analyzer, the control computer sends to read write line to be measured and reads single label instructions, the read write line transmitting antenna is launched electromagnetic signal at interval according to setting-up time and is waited for the electronic tag response, the control computer is again to the signal source sending controling instruction, by signal source transmission antennas transmit power and the controlled interference signal of frequency, spectrum analyzer is caught electromagnetic signal in the standard testing environment by reception antenna, trigger during neighboring trace when transmitting just of signal source occur at synchronization in the main channel of read write line emission to be measured or this main channel, and the single label that reads read write line to be measured by the control computer reads the result, on the control computer, judge whether this reads correct, sending controling instruction is to read write line to be measured and signal source once more after the statistics, and beginning is tested next time after adjustment transmitting power and the frequency.
Preferably, described reading and writing device antenna support, signal source antenna holder and reception antenna support adopt the low and dielectric constant of conductivity to make less than 1.5 material.
Preferably, described read write line transmitting antenna and signal source transmitting antenna are the standard-gain horn antenna of gain for the model of the same race more than 10dBi and the 10dBi, in the test tape wide region, the gain of read write line transmitting antenna and signal source transmitting antenna remains unchanged substantially.
Preferably, described reception antenna is that gain is 2dBi and the above double dipole antenna of 2dBi.
Preferably, described signal source is can be with the instrument of predeterminated frequency and default power emission rfid interrogator signal, and this predeterminated frequency and default power are by the adjustment of control computer remote.
Preferably, described spectrum analyzer is can carry out frequency domain to trigger the also instrument of display radio signal transient waveform.
Preferably, the radio frequency interface and the power interface of described read write line to be measured, signal source, spectrum analyzer, and the electromagnetic radiation that the power interface of control computer sends is isolated by the standard testing environment.
Second aspect present invention provides a kind of reference test method of rfid interrogator adjacent channel interference resisting capacity, may further comprise the steps:
Step 1: device initialize, set up communicating to connect between control computer and read write line to be measured, signal source, the spectrum analyzer respectively, make read write line to be measured and signal source enter readiness for operation, spectrum analyzer enters the frequency domain template trigger mode standby condition of spectrum analyzer, sets the initial value N=0 of current main channel sequence number N;
Step 2: the transmitting power by control computer settings read write line to be measured is the maximum of location regulation read write line transmitting power, sets the emission frequency f of read write line to be measured
cBe f
c=f
0+ N * BW, read write line to be measured repeat transmission and read single electronic tag instruction, wherein f
0Be the lower limit of the read write line transmission center frequency values of location regulation, BW is the transmitted bandwidth of read write line to be measured, and N is current main channel sequence number;
Step 3: it is f to the emission frequency of read write line to be measured that the frequency domain template of setting spectrum analyzer at the control computer terminal triggers function
cSignal trigger, read the maximum signal P of reception antenna position after the triggering
R, P
RUnit is dBm, and with the transmitting power P of signal source
TBe set at:
Step 4: signal source is launched frequency f by the control computer
dBe set at f successively
d=f
c+ i * BW is according to read write line emission frequency f to be measured
c, the transmitted bandwidth BW of read write line to be measured and neighboring trace parameter i calculate, and makes signal source emission frequency f
dLay respectively at read write line emission frequency f to be measured
cLeft side second neighboring trace, left side first neighboring trace, main channel, right side first neighboring trace and right side second neighboring trace, and send rfid interrogator by the control computer by signal source and read single electronic tag instruction, to the emission frequency f of read write line to be measured
cSignal carry out monkey chatter, wherein: the neighboring trace parameter is set to i=-2 ,-1,0,1,2;
Step 5: the frequency domain template of setting spectrum analyzer at the control computer terminal triggers function to read write line emission frequency f to be measured
cSignal and the emission frequency of signal source be f
dSignal trigger, triggering the back is f by the emission frequency that the control computer stops read write line to be measured
cSignal and the emission frequency of signal source be f
dSignal, and single label that read write line to be measured is last read outcome record to control computer in, judge that whether last single label reads the result identical with the true identification number of electronic tag, finishes and once read sampling;
Step 6: whether repeated reading of setting in advance at control computer terminal determining step 5 and sampled M time,, then entered step 7 if repeated to read sampling M time; If repeat to read sampling, then get back to step 5, wherein M 〉=10 less than M time;
Step 7: the emission frequency by control computer statistics read write line to be measured is f
cThe signal emission frequency that is subjected to signal source respectively be f
d, power is P
TInterference signal after, read write line to be measured still correctly reads the number of times of electronic label identification number and the ratio of M, promptly correct read rate;
Step 8: whether controlling computer terminal correct judgment read rate greater than the predefined read rate σ that accepts, if correct read rate is greater than the predefined read rate σ that accepts, then enter step 9, if correct read rate is less than the predefined read rate σ that accepts, then with the transmitting power P of signal source
TReduce a unit of adjustment, get back to step 4;
Step 9: add up the current emission frequency of read write line to be measured f at the control computer terminal
cBeing subjected to signal source emission frequency is f
dSignal when disturbing, reach the maximum interference intensity P that can accept read rate σ
T, current main channel sequence number N value adds 1 simultaneously;
Step 10: judge at the control computer terminal whether current main channel sequence number N value equals the read write line frequency hopping frequency number of location regulation, if equal frequency hopping frequency number, then enter step 11, if be not equal to frequency hopping frequency number, then get back to step 2, test the antijamming capability of next frequency;
Step 11: to maximum antijamming capability, and each neighboring trace reached maximum interference intensity P can accept read rate σ the time from left side second neighboring trace of each frequency of read write line to be measured, left side first neighboring trace, main channel, right side first neighboring trace, right side second neighboring trace in control computer terminal statistics
TCompare with the monkey chatter strength test result of other read write line to be measured, under the identical read rate accepted, monkey chatter is strong more just to illustrate that the adjacent channel interference resisting capacity of this read write line to be measured is strong more;
Step 12: disconnect and to communicate to connect closing device between control computer and read write line to be measured, signal source, the spectrum analyzer.
It is preferably, described that to set up communicating to connect between control computer and read write line to be measured, signal source, the spectrum analyzer respectively be to make by Ethernet or gpib bus to control computer and can send and receive control command and Query Result from read write line to be measured, signal source, spectrum analyzer.
Preferably, it is in a very short cycle in sampling time that the described frequency domain template of setting spectrum analyzer at the control computer terminal triggers, and triggers the corresponding apparatus operational order when occurring satisfying the signal of the frequency set and power condition in the frequency domain.
The invention has the beneficial effects as follows:
1) be to apply power, the controlled rfid interrogator simulation monkey chatter signal of frequency by the people, can be scientifically and repeatably the adjacent channel interference resisting capacity of rfid interrogator be carried out automatic test, not only can directly obtain the read rate performance of a rfid interrogator product when main channel and adjacent channel are interfered, can also be by comparing with the adjacent channel interference resisting capacity of other rfid interrogator product, pick out under many read write lines or intensive read write line environment the more read write line product of steady operation.
2) the main difficult point of scheme provided by the invention is testing weak signals, the external disturbance that occurs in the test process will cause the result gross differences to occur, because test process carries out in the standard testing environment, electromagnetic environment is stable, capital equipment all is maintained fixed, it is few to be subjected to the artificial disturbance factor in the test, and therefore the influence that can effectively avoid external disturbance to bring makes test result have comparativity.
3) use the double dipole antenna lower, that directional diagram is symmetrical that gains as reception antenna, placed side by side with electronic tag, can reduce coupling and interference that reception antenna produces electronic label antenna, adopt the standard-gain horn antenna of gain more than 10dBi as transmitting antenna simultaneously, the signal resolution height can effectively improve the resolution capability of small-signal.
Description of drawings
Fig. 1 is the Benchmark test system schematic diagram of rfid interrogator adjacent channel interference resisting capacity provided by the invention.
Fig. 2 is the reference test method flow chart of rfid interrogator adjacent channel interference resisting capacity provided by the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Along with the application scale of RFID is increasing, the RFID hardware device be on the increase the covering area overlapping that causes some read write line possibly, produce the read write line conflict, even therefore influence the impact of performance of whole rfid system.The Communication Jamming of read write line between many read write lines or intensive read write line environment lower channel carried out the appearance that benchmark test can be avoided this class conflict.The invention provides a kind of system and method that the adjacent channel interference resisting capacity of rfid interrogator is carried out automatic test, can be under controllable environment be the neighboring trace electromagnetic interference that applies main channel by the people, and estimate the quality of read write line antijamming capability with the correct read rate of read write line to be measured under the situation of being interfered, under the identical read rate accepted, monkey chatter is strong more just to illustrate that the adjacent channel interference resisting capacity of this read write line to be measured is strong more.In addition, the resulting result of technical scheme who proposes based on the present invention is qualitatively, can be in various applied environments with for referencial use, solve the true application scenarios of current simulation and set up in the method that test environment estimates only effective problem in this applied environment of test result.
As shown in Figure 1, Fig. 1 is the Benchmark test system schematic diagram of rfid interrogator adjacent channel interference resisting capacity provided by the invention, comprising standard testing environment 1, read write line transmitting antenna 2, signal source transmitting antenna 3, reception antenna 4, electronic tag 5, reading and writing device antenna support 6, signal source antenna holder 7, reception antenna support 8, read write line 9 to be measured, signal source 10, spectrum analyzer 11, control computer 12, wherein the read write line transmitting antenna 2, signal source transmitting antenna 3, reception antenna 4, electronic tag 5, reading and writing device antenna support 6, signal source antenna holder 7, reception antenna support 8 places in the standard testing environment 1, read write line 9 to be measured, signal source 10, spectrum analyzer 11, control computer 12 places outside the standard testing environment 1, read write line transmitting antenna 2 places on the reading and writing device antenna support 6, signal source transmitting antenna 3 places on the signal source antenna holder 7, reception antenna 4 is placed side by side on the reception antenna support 8 with electronic tag 5, reception antenna 4 is positioned over the line center of the radiating surface geometric center position of read write line transmitting antenna 2 and signal source transmitting antenna 3, read write line transmitting antenna 2 and read write line 9 to be measured, signal source transmitting antenna 3 and signal source 10, link to each other by radio frequency feed line respectively between reception antenna 4 and the spectrum analyzer 11, control computer 12 sends to read write line 9 to be measured and reads single label instructions, read write line transmitting antenna 2 is launched electromagnetic signal at interval according to setting-up time and is waited for electronic tag 5 responses, control computer 12 is again to signal source 10 sending controling instructions, by signal source transmitting antenna 3 transmitting powers and the controlled interference signal of frequency, spectrum analyzer 11 is caught electromagnetic signal in the standard testing environment 1 by reception antenna 4, trigger during neighboring trace when transmitting just of signal source 10 occur at synchronization in the main channel of read write line 9 emissions to be measured or this main channel, and the single label that reads read write line 9 to be measured by control computer 12 reads the result, on control computer 12, judge whether this reads correct, sending controling instruction is to read write line 9 to be measured and signal source 10 once more after the statistics, and beginning is tested next time after adjustment transmitting power and the frequency.
In one embodiment of the invention, standard testing environment 1 is based upon long 6 meters, wide 3 meters, in high 3 meters fully anechoic chambers, reading and writing device antenna support 6, signal source antenna holder 7, the height of reception antenna support 8 is 1.5 meters, make by polystyrene material, wrap up in absorbing material outward, support top fixed gain respectively is that the standard-gain horn antenna of 10dBi is as read write line transmitting antenna 2, signal source transmitting antenna 3, and fixed gain is that the double dipole antenna of 2.3dBi is as reception antenna 4, distance between reception antenna 4 and read write line transmitting antenna 2 and the signal source transmitting antenna 3 is 1.5 meters, and the distance between the electronic tag 5 is 0.05 meter, signal source 10 is selected can be with the vector signal generator ESGE4438C of predeterminated frequency and default power emission rfid interrogator analog signal, spectrum analyzer 11 is selected the real-time spectrum analyzer RSA3308A that can carry out frequency domain triggering and display radio signal transient waveform for use, control computer 12 selects to have the ordinary desktop PC of LAN interface, with ESG E4438C, RSA3308A and read write line to be measured 9 connect by the 1000Mbps Ethernet switch, use and finish exchanges data based on the ICP/IP protocol transmission mode of vxi bus.
In order to make test result have repeatability, just need to guarantee that the environmental parameter in the test process keeps stable, promptly need a standard testing environment 1.The place of so-called standard testing environment 1 can be fully anechoic chamber, semi-anechoic chamber, also can be open space.In once complete test, the temperature of standard testing environment all should remain on 23 ± 3 ℃, and humidity is 30～50%, and illuminance is in the low-light level condition and range.In an embodiment of the present invention, select fully anechoic chamber to test, read write line 9 to be measured, signal source 10, spectrum analyzer 11, control computer 12 place outside the fully anechoic chamber, the radio frequency interface of these instruments links to each other with the equipment in darkroom by the optical fiber waveguides in conjunction that is positioned on the fully anechoic chamber wall with power interface, and the electromagnetic radiation of sending of the equipment interface outside the darkroom can not cause change to the electromagnetic environment in the fully anechoic chamber like this.In another embodiment, select open space to test, the radio frequency interface of read write line 9 to be measured, signal source 10, spectrum analyzer 11, control computer 12 links to each other with the equipment that is positioned at open space by long distance of wire with data transmission interface, has guaranteed that equally the influence that electromagnetic radiation that open space equipment interface outward sends causes the electromagnetic environment in the open space drops to minimum.In addition, because the variable that changes only is tranmitting frequency and power in the technical solution of the present invention, so space displacement can not take place in the equipment in the standard testing environment, just can not cause the change of electromagnetic environment yet.And then the material by selecting low conductivity and low-k also can reduce the error that refraction of electromagnetic wave causes result of calculation as support as far as possible.Can think that it is stable that the environmental parameter in the present embodiment all can keep, and can be used as the standard testing environment and test.
As shown in Figure 2, Fig. 2 is the reference test method flow chart of rfid interrogator adjacent channel interference resisting capacity provided by the invention, may further comprise the steps:
Step 201: device initialize, set up communicating to connect between control computer 12 and read write line to be measured 9, signal source 10, the spectrum analyzer 11 respectively, make read write line 9 to be measured and signal source 10 enter readiness for operation, spectrum analyzer 11 enters the frequency domain template trigger mode standby condition of spectrum analyzer, and set the test loop number of times according to the read write line frequency hopping frequency number of location regulation, as being every section each 20 of 840-845MHz and 920-925MHz at Chinese frequency hopping frequency, the initial value of setting current main channel sequence number N is 0;
Step 202: the transmitting power of setting read write line 9 to be measured by control computer 12 is the maximum of location regulation read write line transmitting power, and as being 2W ERP to the maximum in Chinese transmitting power, the emission frequency of setting read write line 9 to be measured is made as f
c=f
0+ N * BW, read write line 9 to be measured repeat transmission and read single electronic tag instruction, wherein f
0Lower limit for the read write line transmission center frequency values of location regulation is 840-845MHz and 920-925MHz, f as the frequency range of using in China RFID
0Then be respectively 840.125MHz and 920.125MHz, BW is the transmitted bandwidth of read write line to be measured, and as being 250KHz in China, N is current main channel sequence number;
Step 203: it is f to the emission frequency of read write line 9 to be measured that the frequency domain template of setting spectrum analyzer 11 at control computer 12 ends triggers function
cThe main channel signal trigger, read the maximum signal of reception antenna 4 positions after the triggering, be recorded as P
R, unit is dBm, and according to the transmitting power in the propagation formula signal calculated source 10 of electric wave in free space is:
Wherein d is the distance between reception antenna 4 and read write line transmitting antenna 2 and the signal source transmitting antenna 3, in the present embodiment is 1.5 meters, λ=c/f
cBe wavelength, work as f
cDuring=840.125MHz, f is worked as in λ=0.3568 meter
cDuring=920.125MHz, λ=0.3258 meter, G
RBe the gain of reception antenna 4, G
TBe the gain of read write line transmitting antenna 2 and signal source transmitting antenna 3, G in the present embodiment
R=2.3dBi, G
T=10dBi;
Step 204: signal source 10 is launched frequency f by control computer 12
dBe set at f successively
d=f
c+ i * BW is according to the emission frequency f of read write line 9 to be measured
c, the transmitted bandwidth BW of read write line 10 to be measured and neighboring trace parameter i calculate, and makes the emission frequency f of signal source 10
dLay respectively at the emission frequency f of read write line 9 to be measured
cLeft side second neighboring trace, left side first neighboring trace, main channel, right side first neighboring trace and right side second neighboring trace, for example work as f
cDuring=920.625MHz, then five are disturbed frequency to be respectively [920.125 920.375 920.625 920.875 921.125] MHz, and read single electronic tag by control computer 12 by signal source 10 transmission rfid interrogators and instruct, to the emission frequency f of read write line 9 to be measured
cSignal carry out monkey chatter, wherein: the neighboring trace parameter is set to i=-2 ,-1,0,1,2;
Step 205: the frequency domain template triggering function of setting spectrum analyzer 11 at control computer 12 ends is f to the emission frequency of read write line 9 to be measured successively
cThe main channel signal and the emission frequency of signal source 10 be f
dInterference signal trigger, trigger the back and stop read write line 9 to be measured and signal source 10 transmission signals by control computer 12, and with read write line 9 last single labels to be measured read outcome record to control computer 12 in, judge that last single label reads as a result whether it identical with the true identification number of electronic tag 5, finishes and once reads sampling;
Step 206: whether repeated reading of setting in advance at control computer 12 end determining steps 205 and sampled M time, M 〉=10 wherein, M=100 promptly disturbs frequency test 100 times at each in the present embodiment, if repeated to read sampling 100 times, then entered step 207; If repeat to read sampling less than 100 times, then get back to step 205;
Step 207: the emission frequency by control computer 12 statistics read write line 9 to be measured is f
cThe signal emission frequency that is subjected to signal source 10 respectively be f
d, power is P
TInterference signal after, read write line 9 to be measured still correctly reads the number of times of electronic tag 5 identification numbers and the ratio of M, promptly correct read rate;
Step 208: whether controlling computer 12 end correct judgment read rates greater than the predefined read rate σ that accepts, σ=0.85 in the present embodiment, promptly in 100 tests, can think correctly that if any reading more than 85 times read write line 9 to be measured passes through the anti-interference capability testing of this interference channel, if correct read rate is greater than the predefined read rate σ that accepts, then enter step 2099, if correct read rate is less than the predefined read rate σ that accepts, then with the transmitting power P of signal source 10
TReducing a unit of adjustment, is 1dB in the present embodiment, gets back to step 204;
Step 209: add up read write line 9 current emission frequency f to be measured at control computer 12 ends
cBeing subjected to signal source 10 emission frequencies is f
dSignal when disturbing, reach the maximum interference intensity P that can accept read rate σ
T, current main channel sequence number N value adds 1 simultaneously;
Step 210: judge at control computer 12 ends whether current main channel sequence number N value equals 20, it is the frequency hopping frequency number of stipulating in the present embodiment, if equal frequency hopping frequency number, then enter step 211, if be not equal to frequency hopping frequency number, then get back to step 202, test the antijamming capability of next frequency;
Step 211: to maximum antijamming capability, and each neighboring trace reached maximum interference intensity P can accept read rate σ the time from left side second neighboring trace of read write line 9 each frequency to be measured, left side first neighboring trace, main channel, right side first neighboring trace, right side second neighboring trace in control computer 12 ends statistics
TCompare with the monkey chatter strength test result of other read write line 9 to be measured, under the identical read rate accepted, first neighboring trace can reach the maximum interference intensity that can accept read rate and is-30dBm if certain read write line A is in the left side, another read write line B is-25dBm, because the monkey chatter of B is stronger, then can reach a conclusion, under this frequency, the adjacent channel interference resisting capacity of read write line B first neighboring trace in the left side is better than read write line A;
Step 212: disconnect and to communicate to connect closing device between control computer 12 and read write line to be measured 9, signal source 10, the spectrum analyzer 11.
Describing above is to be used to realize the present invention and embodiment, scope of the present invention should not described by this and limit, it should be appreciated by those skilled in the art,, all belong to claim of the present invention and come restricted portion in any modification or partial replacement that does not depart from the scope of the present invention.
Claims (10)
1. the Benchmark test system of a rfid interrogator adjacent channel interference resisting capacity, it is characterized in that: comprise the standard testing environment, the read write line transmitting antenna, the signal source transmitting antenna, reception antenna, electronic tag, the reading and writing device antenna support, the signal source antenna holder, the reception antenna support, read write line to be measured, signal source, spectrum analyzer, the control computer, read write line transmitting antenna wherein, the signal source transmitting antenna, reception antenna, electronic tag, the reading and writing device antenna support, the signal source antenna holder, reception antenna props up the inside that is placed on the standard testing environment, read write line to be measured, signal source, spectrum analyzer, the control computer places the outside of standard testing environment, the read write line transmitting antenna places on the reading and writing device antenna support, the signal source transmitting antenna places on the signal source antenna holder, reception antenna is opposite on the reception antenna support mutually with electronic tag, reception antenna is positioned over the center of the radiating surface geometric center position line of read write line transmitting antenna and signal source transmitting antenna, read write line transmitting antenna and read write line to be measured, signal source transmitting antenna and signal source, link to each other by radio frequency feed line respectively between reception antenna and the spectrum analyzer, the control computer sends to read write line to be measured and reads single label instructions, the read write line transmitting antenna is launched electromagnetic signal at interval according to setting-up time and is waited for the electronic tag response, the control computer is again to the signal source sending controling instruction, by signal source transmission antennas transmit power and the controlled interference signal of frequency, spectrum analyzer is caught electromagnetic signal in the standard testing environment by reception antenna, trigger during neighboring trace when transmitting just of signal source occur at synchronization in the main channel of read write line emission to be measured or this main channel, and the single label that reads read write line to be measured by the control computer reads the result, on the control computer, judge whether this reads correct, sending controling instruction is to read write line to be measured and signal source once more after the statistics, and beginning is tested next time after adjustment transmitting power and the frequency.
2. the Benchmark test system of rfid interrogator adjacent channel interference resisting capacity according to claim 1 is characterized in that: described reading and writing device antenna support, signal source antenna holder and reception antenna support adopt the low and dielectric constant of conductivity to make less than 1.5 material.
3. the Benchmark test system of rfid interrogator adjacent channel interference resisting capacity according to claim 1, it is characterized in that: described read write line transmitting antenna and signal source transmitting antenna are the standard-gain horn antenna of gain for the model of the same race more than 10dBi and the 10dBi, in the test tape wide region, the gain of read write line transmitting antenna and signal source transmitting antenna remains unchanged substantially.
4. the Benchmark test system of rfid interrogator adjacent channel interference resisting capacity according to claim 1 is characterized in that: described reception antenna is that gain is 2dBi and the above double dipole antenna of 2dBi.
5. the Benchmark test system of rfid interrogator adjacent channel interference resisting capacity according to claim 1, it is characterized in that: described signal source is can be with the instrument of predeterminated frequency and default power emission rfid interrogator signal, and this predeterminated frequency and default power are by the adjustment of control computer remote.
6. the Benchmark test system of rfid interrogator adjacent channel interference resisting capacity according to claim 1 is characterized in that: described spectrum analyzer is can carry out frequency domain to trigger the also instrument of display radio signal transient waveform.
7. the Benchmark test system of rfid interrogator adjacent channel interference resisting capacity according to claim 1, it is characterized in that: the radio frequency interface and the power interface of described read write line to be measured, signal source, spectrum analyzer, and the electromagnetic radiation that the power interface of control computer sends is isolated by the standard testing environment.
8. the reference test method of a rfid interrogator adjacent channel interference resisting capacity is characterized in that, may further comprise the steps:
Step 1: device initialize, set up communicating to connect between control computer and read write line to be measured, signal source, the spectrum analyzer respectively, make read write line to be measured and signal source enter readiness for operation, spectrum analyzer enters the frequency domain template trigger mode standby condition of spectrum analyzer, sets the initial value N=0 of current main channel sequence number N;
Step 2: the transmitting power by control computer settings read write line to be measured is the maximum of location regulation read write line transmitting power, sets the emission frequency f of read write line to be measured
cBe f
c=f
0+ N * BW, read write line to be measured repeat transmission and read single electronic tag instruction, wherein f
0Be the lower limit of the read write line transmission center frequency values of location regulation, BW is the transmitted bandwidth of read write line to be measured, and N is current main channel sequence number;
Step 3: it is f to the emission frequency of read write line to be measured that the frequency domain template of setting spectrum analyzer at the control computer terminal triggers function
cSignal trigger, read the maximum signal P of reception antenna position after the triggering
R, P
RUnit is dBm, and with the transmitting power P of signal source
TBe set at:
Wherein d is the distance between reception antenna and read write line transmitting antenna and the signal source transmitting antenna, and λ is a wavelength, G
RBe receiving antenna gain, G
TBe read write line transmitting antenna and signal source transmitter antenna gain (dBi);
Step 4: signal source is launched frequency f by the control computer
dBe set at f successively
d=f
c+ i * BW is according to read write line emission frequency f to be measured
c, the transmitted bandwidth BW of read write line to be measured and neighboring trace parameter i calculate, and makes signal source emission frequency f
dLay respectively at read write line emission frequency f to be measured
cLeft side second neighboring trace, left side first neighboring trace, main channel, right side first neighboring trace and right side second neighboring trace, and send rfid interrogator by the control computer by signal source and read single electronic tag instruction, to the emission frequency f of read write line to be measured
cSignal carry out monkey chatter, wherein: the neighboring trace parameter is set to i=-2 ,-1,0,1,2;
Step 5: the frequency domain template of setting spectrum analyzer at the control computer terminal triggers function to read write line emission frequency f to be measured
cSignal and the emission frequency of signal source be f
dSignal trigger, triggering the back is f by the emission frequency that the control computer stops read write line to be measured
cSignal and the emission frequency of signal source be f
dSignal, and single label that read write line to be measured is last read outcome record to control computer in, judge that whether last single label reads the result identical with the true identification number of electronic tag, finishes and once read sampling;
Step 6: whether repeated reading of setting in advance at control computer terminal determining step 5 and sampled M time,, then entered step 7 if repeated to read sampling M time; If repeat to read sampling, then get back to step 5, wherein M 〉=10 less than M time;
Step 7: the emission frequency by control computer statistics read write line to be measured is f
cThe signal emission frequency that is subjected to signal source respectively be f
d, power is P
TInterference signal after, read write line to be measured still correctly reads the number of times of electronic label identification number and the ratio of M, promptly correct read rate;
Step 8: whether controlling computer terminal correct judgment read rate greater than the predefined read rate σ that accepts, if correct read rate is greater than the predefined read rate σ that accepts, then enter step 9, if correct read rate is less than the predefined read rate σ that accepts, then with the transmitting power P of signal source
TReduce a unit of adjustment, get back to step 4;
Step 9: add up the current emission frequency of read write line to be measured f at the control computer terminal
cBeing subjected to signal source emission frequency is f
dSignal when disturbing, reach the maximum interference intensity P that can accept read rate σ
T, current main channel sequence number N value adds 1 simultaneously;
Step 10: judge at the control computer terminal whether current main channel sequence number N value equals the read write line frequency hopping frequency number of location regulation, if equal frequency hopping frequency number, then enter step 11, if be not equal to frequency hopping frequency number, then get back to step 2, test the antijamming capability of next frequency;
Step 11: to maximum antijamming capability, and each neighboring trace reached maximum interference intensity P can accept read rate σ the time from left side second neighboring trace of each frequency of read write line to be measured, left side first neighboring trace, main channel, right side first neighboring trace, right side second neighboring trace in control computer terminal statistics
TCompare with the monkey chatter strength test result of other read write line to be measured, under the identical read rate accepted, monkey chatter is strong more just to illustrate that the adjacent channel interference resisting capacity of this read write line to be measured is strong more;
Step 12: disconnect and to communicate to connect closing device between control computer and read write line to be measured, signal source, the spectrum analyzer.
9. the reference test method of rfid interrogator adjacent channel interference resisting capacity according to claim 8 is characterized in that: described to set up communicating to connect between control computer and read write line to be measured, signal source, the spectrum analyzer respectively be to make by Ethernet or gpib bus to control computer and can send and receive control command and Query Result from read write line to be measured, signal source, spectrum analyzer.
10. the reference test method of rfid interrogator adjacent channel interference resisting capacity according to claim 8, it is characterized in that: it is in a very short cycle in sampling time that the described frequency domain template of setting spectrum analyzer at the control computer terminal triggers, and triggers the corresponding apparatus operational order when occurring satisfying the signal of the frequency set and power condition in the frequency domain.
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