CN103926547A - Radio frequency identification tester calibration device and method - Google Patents
Radio frequency identification tester calibration device and method Download PDFInfo
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Abstract
The invention provides a radio frequency identification tester calibration device and method. The device comprises an attenuator, a frequency meter, a microwave power meter, an induction coil, a vector signal analyzer and a signal generator, wherein the transmitting end of a radio frequency identification tester is connected with the attenuator, the frequency meter is connected with the output end of the attenuator, the microwave power meter is connected with the output end of the attenuator, the induction coil is connected with the transmitting end of the radio frequency identification tester, the output end of the induction coil is connected with a digital oscilloscope, the vector signal analyzer is connected with the transmitting end of the radio frequency identification tester, the signal generator is connected with receiving end of the radio frequency identification tester, and the output end of the signal generator is connected the receiving end of the radio frequency identification tester and the input end of the microwave power meter. The radio frequency identification tester calibration device and method can precisely calibrate the radio frequency identification tester used during radio frequency identification card testing.
Description
Technical field
The present invention relates to a kind of radio-frequency (RF) identification tester calibration device and method.
Background technology
Radio-frequency (RF) identification (RFID) tester is widely used in the research and development of rfid card, production, test, RFID tester includes RFID transmitter and RFID receiver, transmitter is launched needed RFID signal, rfid card receives after this RFID signal, after decoding, signal transmitting is gone back, radio frequency testing instrument receives signal the correct demodulation that rfid card sends it back again again.Therefore, radio-frequency (RF) identification tester whether accurately and reliably in the test of rfid card by extremely important.Up to the present, country does not promulgate radio-frequency (RF) identification (RFID) tester calibrating standard or vertification regulation.
Summary of the invention
The object of the present invention is to provide a kind of radio-frequency (RF) identification tester calibration device and method, can carry out accurate calibration to the radio-frequency (RF) identification tester using in radio-frequency identification card test.
For addressing the above problem, the invention provides a kind of radio-frequency (RF) identification tester calibration device, comprising:
The attenuator being connected with the transmitting terminal of radio-frequency (RF) identification tester, the input end of described attenuator is connected with described transmitting terminal, with the frequency meter that the output terminal of described attenuator is connected, described frequency meter is for reading the count value of the output frequency of radio-frequency (RF) identification tester by described attenuator;
With the microwave power meter that the output terminal of described attenuator is connected, described microwave power meter is for obtaining the count value of the output power of radio-frequency (RF) identification tester by described attenuator;
The inductive coil being connected with the transmitting terminal of radio-frequency (RF) identification tester, the input end of described inductive coil is connected with described transmitting terminal, the output terminal of described inductive coil is connected with digital oscilloscope, and described digital oscilloscope is for measuring the output voltage amplitude of described inductive coil;
With the VSA that the transmitting terminal of radio-frequency (RF) identification tester is connected, described VSA is for obtaining modulation index, frequency error and the signal output waveform parameter of radio-frequency (RF) identification tester;
The signal generator being connected with the receiving end of radio-frequency (RF) identification tester, for to radio-frequency (RF) identification tester output power value and reader signal, the output terminal of described signal generator is connected with the input end of described receiving end and microwave power meter respectively.
Further, in said apparatus, described inductive coil is PCD antenna sets or VCD antenna sets.
Further, in said apparatus, for the radio-frequency (RF) identification tester that meets ISO/IEC14443 standard, described inductive coil is PCD antenna sets.
Further, in said apparatus, for the radio-frequency (RF) identification tester that meets ISO/IEC15693 standard, described inductive coil is VCD antenna sets.
According to another side of the present invention, a kind of radio-frequency (RF) identification tester calibration steps is provided, adopt above-mentioned radio-frequency (RF) identification tester calibration device, described method comprises:
Arrange after the output frequency and output power of radio-frequency (RF) identification tester, radio-frequency (RF) identification tester is exported signal continuous, that do not add modulation by attenuator to frequency meter, reads the count value of described output frequency from frequency meter;
Arrange after the output frequency and output power of radio-frequency (RF) identification tester, radio-frequency (RF) identification tester is exported signal continuous, that do not add modulation by attenuator to microwave power meter, read the count value of described output power from microwave power meter, determine the output power of radio-frequency (RF) identification tester according to the pad value of the count value of described output power and attenuator;
The input impedance of described digital oscilloscope is chosen as to high resistant, arrange after the output signal field intensity of radio-frequency (RF) identification tester, radio-frequency (RF) identification tester is exported signal continuous, that do not add modulation to inductive coil, adjust the time scale of digital oscilloscope and the position that voltage scale arrives, regulate digital oscilloscope vertical size and after sweep time, read the output voltage amplitude of the described inductive coil of described digital oscilloscope measurement, determine the output field intensity of radio-frequency (RF) identification tester according to described output voltage amplitude;
Be reader simulator state by the condition selecting of radio-frequency (RF) identification tester, the centre frequency of setting radio-frequency (RF) identification tester is 915MHz, after output power is 0dBm, radio-frequency (RF) identification tester is to VSA output signal, be radio-frequency (RF) identification analysis by the condition selecting of VSA, the centre frequency of setting VSA is 915MHz, output level is that 0dBm and triggering mode are intermediate frequency amplitude and select forward direction and corresponding speed, and select the analysis result of VSA for after ordering, gather from the result kind of VSA the modulation index that reads radio-frequency (RF) identification tester picture, frequency error and signal output waveform parameter,
After the output frequency and output level of setting signal generator, signal generator output continuous wave signal, from the output power of described microwave power meter read signal generator, the output power of holding signal generator is constant and to described radio-frequency (RF) identification tester output, the duty of radio-frequency (RF) identification tester is selected to power measurement, the receive frequency of radio-frequency (RF) identification tester is set to the frequency identical with the output frequency of described signal generator, expection incoming level is set to be greater than or equal to after the output power of the signal generator that described microwave power meter reads, from radio-frequency (RF) identification tester, read the received power receiving from described signal generator,
The centre frequency that described signal generator is set is 915MHz, output power is 0dBm, and select output type be simulation reader signal and trigger type be single trigger, select the reader uniformity test panel in radio-frequency (RF) identification tester, and the centre frequency of radio-frequency (RF) identification tester is 915MHz, analysis level is 0dBm, trigger mode is set for analyzing after rising edge triggering, the key that obtains of pressing radio-frequency (RF) identification tester obtains signal, trigger signal generator is to send a reader signal to radio-frequency (RF) identification tester, radio-frequency (RF) identification tester obtains reader analytic signal to sampling the reader signal select time scope obtaining and analyzing, from described reader analytic signal, read modulation index.
Further, in said method, determine in the step of output power of radio-frequency (RF) identification tester according to the pad value of the count value of described output power and attenuator, the output power of described radio-frequency (RF) identification tester is pressed following formula and is determined:
Ps=P+A，
Wherein, Ps represents the output power of radio-frequency (RF) identification tester, and unit is dBm, and P represents power meter reading, and unit is dBm, and A represents the pad value of attenuator, and unit is dB.
Further, in said method, determine according to described output voltage amplitude in the step of output field intensity of radio-frequency (RF) identification tester, determine the output field intensity of radio-frequency (RF) identification tester according to following formula:
H=V/ｋ
Ｃ，
Wherein, H is the output field intensity of radio-frequency (RF) identification tester, the A/m of unit, and V is the output voltage amplitude of the inductive coil of described digital oscilloscope measurement, unit is mVp-p, k
cfor the correction factor of described inductive coil.
Compared with prior art, the present invention is by arranging after the output frequency and output power of radio-frequency (RF) identification tester, and radio-frequency (RF) identification tester is exported signal continuous, that do not add modulation by attenuator to frequency meter, reads the count value of described output frequency from frequency meter, arrange after the output frequency and output power of radio-frequency (RF) identification tester, radio-frequency (RF) identification tester is exported signal continuous, that do not add modulation by attenuator to microwave power meter, read the count value of described output power from microwave power meter, determine the output power of radio-frequency (RF) identification tester according to the pad value of the count value of described output power and attenuator, the input impedance of described digital oscilloscope is chosen as to high resistant, arrange after the output signal field intensity of radio-frequency (RF) identification tester, radio-frequency (RF) identification tester is exported signal continuous, that do not add modulation to inductive coil, adjust the time scale of digital oscilloscope and the position that voltage scale arrives, regulate digital oscilloscope vertical size and after sweep time, read the output voltage amplitude of the described inductive coil of described digital oscilloscope measurement, determine the output field intensity of radio-frequency (RF) identification tester according to described output voltage amplitude, be reader simulator state by the condition selecting of radio-frequency (RF) identification tester, the centre frequency of setting radio-frequency (RF) identification tester is 915MHz, after output power is 0dBm, radio-frequency (RF) identification tester is to VSA output signal, be radio-frequency (RF) identification analysis by the condition selecting of VSA, the centre frequency of setting VSA is 915MHz, output level is that 0dBm and triggering mode are intermediate frequency amplitude and select forward direction and corresponding speed, and select the analysis result of VSA for after ordering, gather from the result kind of VSA the modulation index that reads radio-frequency (RF) identification tester picture, frequency error and signal output waveform parameter, after the output frequency and output level of setting signal generator, signal generator output continuous wave signal, from the output power of described microwave power meter read signal generator, the output power of holding signal generator is constant and to described radio-frequency (RF) identification tester output, the duty of radio-frequency (RF) identification tester is selected to power measurement, the receive frequency of radio-frequency (RF) identification tester is set to the frequency identical with the output frequency of described signal generator, expection incoming level is set to be greater than or equal to after the output power of the signal generator that described microwave power meter reads, from radio-frequency (RF) identification tester, read the received power receiving from described signal generator, the centre frequency that described signal generator is set is 915MHz, output power is 0dBm, and select output type be simulation reader signal and trigger type be single trigger, select the reader uniformity test panel in radio-frequency (RF) identification tester, and the centre frequency of radio-frequency (RF) identification tester is 915MHz, analysis level is 0dBm, trigger mode is set for analyzing after rising edge triggering, the key that obtains of pressing radio-frequency (RF) identification tester obtains signal, trigger signal generator is to send a reader signal to radio-frequency (RF) identification tester, radio-frequency (RF) identification tester obtains reader analytic signal to sampling the reader signal select time scope obtaining and analyzing, from described reader analytic signal, read modulation index, can carry out accurate calibration to the radio-frequency (RF) identification tester using in radio-frequency identification card test.
Brief description of the drawings
Fig. 1 is the device connection diagram of the output frequency calibration of the radio-frequency (RF) identification tester of one embodiment of the invention;
Fig. 2 is the device connection diagram of the output power calibration of the radio-frequency (RF) identification tester of one embodiment of the invention;
Fig. 3 is the device connection diagram of the output Field strength calibration of the radio-frequency (RF) identification tester of one embodiment of the invention;
Fig. 4 is the device connection diagram of the transmitting terminal modulation index calibration of the radio-frequency (RF) identification tester of one embodiment of the invention;
Fig. 5 is the device connection diagram of the received power calibration of the radio-frequency (RF) identification tester of one embodiment of the invention;
Fig. 6 is the device connection diagram of the receiving end modulation index calibration of the radio-frequency (RF) identification tester of one embodiment of the invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Embodiment mono-
The invention provides a kind of radio-frequency (RF) identification tester calibration device, comprising:
As shown in Figure 1, the attenuator being connected with the transmitting terminal 11 of radio-frequency (RF) identification tester 1, the input end of described attenuator 2 is connected with described transmitting terminal 11, the frequency meter 3 being connected with the output terminal of described attenuator 2, described frequency meter 3 is for reading the count value of the output frequency of radio-frequency (RF) identification tester 1 by described attenuator 2;
As shown in Figure 2, the microwave power meter 4 being connected with the output terminal of described attenuator 2, described microwave power 4 is for obtaining the count value of the output power of radio-frequency (RF) identification tester 1 by described attenuator 2;
As shown in Figure 3, the inductive coil being connected with the transmitting terminal 11 of radio-frequency (RF) identification tester 1, the input end of described inductive coil 5 is connected with described transmitting terminal 11, the output terminal of described inductive coil 5 is connected with digital oscilloscope 6, and described digital oscilloscope 6 is for measuring the output voltage amplitude of described inductive coil 5; Preferably, described inductive coil 5 is PCD antenna sets or VCD antenna sets, and wherein, for the radio-frequency (RF) identification tester that meets ISO/IEC14443 standard, described inductive coil is PCD antenna sets; For the radio-frequency (RF) identification tester that meets ISO/IEC15693 standard, described inductive coil is VCD antenna sets;
As shown in Figure 4, with the VSA that can analyze RFID signal 7 that the transmitting terminal 11 of radio-frequency (RF) identification tester 1 is connected, described VSA 7 is for obtaining modulation index, frequency error and the signal output waveform parameter of radio-frequency (RF) identification tester 1;
As illustrated in Figures 5 and 6, the signal generator 8 being connected with the receiving end 12 of radio-frequency (RF) identification tester 1, be used for to radio-frequency (RF) identification tester 1 output power value and reader signal, the output terminal of described signal generator 8 is connected with the input end of described receiving end 12 and microwave power meter 4 respectively.
The present embodiment can carry out accurate calibration to the radio-frequency (RF) identification tester using in radio-frequency identification card test.
Embodiment bis-
As shown in Fig. 1～6, the present invention also provides another kind of radio-frequency (RF) identification tester calibration steps, adopts the radio-frequency (RF) identification tester calibration device of embodiment mono-, and described method comprises:
Step 1, arranges after the output frequency and output power of radio-frequency (RF) identification tester, and radio-frequency (RF) identification tester is exported signal continuous, that do not add modulation by attenuator to frequency meter, reads the count value of described output frequency from frequency meter; Concrete, the instrument in this step connects as shown in Figure 1;
Step 2, arrange after the output frequency and output power of radio-frequency (RF) identification tester, radio-frequency (RF) identification tester is exported signal continuous, that do not add modulation by attenuator to microwave power meter, read the count value of described output power from microwave power meter, determine the output power of radio-frequency (RF) identification tester according to the pad value of the count value of described output power and attenuator; Concrete, the instrument in this step connects as shown in Figure 2; Preferably, determine in the step of output power of radio-frequency (RF) identification tester according to the pad value of the count value of described output power and attenuator, the output power of described radio-frequency (RF) identification tester is pressed following formula and is determined:
Ps=P+A，
Wherein, Ps represents the output power of radio-frequency (RF) identification tester, and unit is dBm, and P represents power meter reading, and unit is dBm, and A represents the pad value of attenuator, and unit is dB;
Step 3, the input impedance of described digital oscilloscope is chosen as to high resistant, arrange after the output signal field intensity of radio-frequency (RF) identification tester, radio-frequency (RF) identification tester is exported signal continuous, that do not add modulation to inductive coil, adjust the time scale of digital oscilloscope and the position that voltage scale arrives, regulate digital oscilloscope vertical size and after sweep time, read the output voltage amplitude of the described inductive coil of described digital oscilloscope measurement, determine the output field intensity of radio-frequency (RF) identification tester according to described output voltage amplitude, concrete, for the radio-frequency identification card of 13.56MHz, calibration output signal is RF field intensity, for the RFID tester that meets ISO/IEC14443 standard, selects PCD(PCD Proximity coupling device proximity Coupling device) antenna sets, for the RFID tester that meets ISO/IEC15693 standard, select the contiguous formula Coupling device of VCD(VCD vicinity coupling device) antenna sets, as shown in Figure 3, the transmitting terminal of RFID tester is connected with the input end of PCD emitting antenna, the output of alignment coil is connected with oscillograph, oscillographic input impedance is chosen as high resistant, set RFID tester output signal field intensity, output does not add modulation signal (being CW signal), oscillographic time scale and voltage scale are adjusted to applicable position, suitably regulate oscillographic vertical size and sweep time, read the inductive coil output voltage amplitude Vp-p of oscillographic measurement, preferably, determine according to described output voltage amplitude in the step of output field intensity of radio-frequency (RF) identification tester, determine the output field intensity of radio-frequency (RF) identification tester according to following formula:
H=V/ｋ
Ｃ，
Wherein, H is the output field intensity of radio-frequency (RF) identification tester, the A/m of unit, and V is the output voltage amplitude of the inductive coil of described digital oscilloscope measurement, unit is mVp-p, k
cfor the correction factor of described inductive coil, k
c=900mVp-p(A/m) (rms);
Step 4, be reader simulator state (Reader Emulator) by the condition selecting of radio-frequency (RF) identification tester, the centre frequency of setting radio-frequency (RF) identification tester is 915MHz, after output power is 0dBm, radio-frequency (RF) identification tester is to VSA output signal, be radio-frequency (RF) identification (RFID) analysis by the condition selecting of VSA, the centre frequency of setting VSA is 915MHz, output level be 0dBm and triggering mode be intermediate frequency amplitude (IF mag) and select forward direction (Forward read write line to card, be Interrogator → Tag) and corresponding speed, and select the analysis result of VSA for ordering after (command), gather from the result kind of VSA the modulation index that reads radio-frequency (RF) identification tester picture (ASK summary), frequency error and signal output waveform parameter, concrete, as shown in Figure 4, the output of RFID tester is connected to the signal input part of VSA by cable, RFID tester is selected Reader Emulator, choice criteria is EPC global class-1G-2 for example, setting centre frequency is 915MHz, setpoint power output is 0dBm, send suitable order, for example Query, transmitted signal, VSA selects RFID to analyze, setting centre frequency is 915MHz, setting output level is 0dBm, setting triggering mode is IF mag, choice criteria for example EPC consistent with RFID tester global class-1Generation2, and (Forward read write line is to card to select forward direction, be Interrogator → Tag) and select corresponding speed, selection analysis result is command, be that ASK summary reads out test result from result.Modulation index, and frequency error, and record;
Step 5, after the output frequency and output level of setting signal generator, signal generator output continuous wave signal, from the output power of described microwave power meter read signal generator, the output power of holding signal generator is constant and to described radio-frequency (RF) identification tester output, the duty of radio-frequency (RF) identification tester is selected to power measurement, the receive frequency of radio-frequency (RF) identification tester is set to the frequency identical with the output frequency of described signal generator, expection incoming level is set to be greater than or equal to after the output power of the signal generator that described microwave power meter reads, from radio-frequency (RF) identification tester, read the received power receiving from described signal generator, concrete, as shown in Figure 5, signal generator output continuous wave signal, output frequency is set as f, conditioning signal generator output level, the indicated value that makes microwave power meter is Ps, then, the output of signal generator remains unchanged, radio-frequency cable is connected with the receiving port of RFID tester, and RFID tester is selected power measurement, and receive frequency is set to f, expection incoming level is greater than (or equaling) Ps, reads measurement power from radio-frequency (RF) identification tester,
Step 6, the centre frequency that described signal generator is set is 915MHz, output power is 0dBm, and select output type be simulation reader signal (Reader Emulator) and trigger type be single trigger (single), select the reader uniformity test panel (Reader comformance test panel) in radio-frequency (RF) identification tester, and the centre frequency of radio-frequency (RF) identification tester is 915MHz, analysis level is 0dBm, trigger mode (Trigger mode) is set to be triggered after (analyze rising edge) for analyzing rising edge, the key (Acquire) that obtains of pressing radio-frequency (RF) identification tester obtains signal, trigger signal generator is to send a reader signal to radio-frequency (RF) identification tester, radio-frequency (RF) identification tester obtains reader analytic signal to sampling the reader signal select time scope obtaining and analyzing, from described reader analytic signal (Reader analysis), read modulation index (Mod depth).Concrete, as shown in Figure 6, the output of signal generator is connected to the receiving port of RFID tester, signal generator choice criteria is EPC global class-1Generation2, it is 915MHz that centre frequency is set, output power is 0dBm, select needed output type, Reader Emulator simulates the signal of reader, trigger type Trigger Type and select single(No Retrigger), RFID tester is selected Reader comformance test panel(EPC UHF Gen2), it is 915MHz that RFID tester centre frequency is set, analysis level is 0dBm, it is analyze rising edge that Trigger mode is set, then obtain signal by Acquire, press signal generator and trigger a reader signal of (trigger) transmission, the signal in RFID analyser, sampling being obtained selects suitable time range to analyze, observation test result, from Reader analysis, read Mod depth.
Detailed, the test result of the RFID tester of one embodiment of the invention is as follows:
1) RFID tester output frequency
| Nominal value (MHz) | Measured value (MHz) | Uncertainty |
| 13.56 | 13.55996 | U rel=1×10 -6(k=2) |
| 915 | 914.9997 | U rel=1×10 -6(k=2) |
| 2450 | 2449.993 | U rel=1×10 -6(k=2) |
2) RFID tester output power
3) RFID tester output field intensity
| Frequency (MHz) | Field intensity (V/m) | Measured value (V/m) | Uncertainty |
| 13.56 | 5 | 5.1 | 6% |
4) RFID tester modulation index (EPC UHF GEN2)
| Frequency (MHz) | Measured value | Uncertainty |
| 915 | 90.1% | U rel=2%(k=2) |
5) signal output waveform parameter (EPC UHF GEN2)
6) power measurement
7) modulation index is measured (EPC UHF GEN2)
| Frequency (MHz) | Standard value | Indicated value |
| 915 | 90.1% | 90.6% |
The present invention can carry out accurate calibration to the radio-frequency (RF) identification tester using in radio-frequency identification card test.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment, between each embodiment identical similar part mutually referring to.For the disclosed system of embodiment, owing to corresponding to the method disclosed in Example, so description is fairly simple, relevant part illustrates referring to method part.
Professional can also further recognize, unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can be with electronic hardware, determine that machine software or the combination of the two realize, for the interchangeability of hardware and software is clearly described, composition and the step of each example described according to function in the above description in general manner.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can realize described function with distinct methods to each specifically should being used for, but this realization should not thought and exceeds scope of the present invention.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention invention.Like this, if these amendments of the present invention and within modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to including these changes and modification.
Claims (7)
1. a radio-frequency (RF) identification tester calibration device, is characterized in that, comprising:
The attenuator being connected with the transmitting terminal of radio-frequency (RF) identification tester, the input end of described attenuator is connected with described transmitting terminal, with the frequency meter that the output terminal of described attenuator is connected, described frequency meter is for reading the count value of the output frequency of radio-frequency (RF) identification tester by described attenuator;
With the microwave power meter that the output terminal of described attenuator is connected, described microwave power meter is for obtaining the count value of the output power of radio-frequency (RF) identification tester by described attenuator;
The inductive coil being connected with the transmitting terminal of radio-frequency (RF) identification tester, the input end of described inductive coil is connected with described transmitting terminal, the output terminal of described inductive coil is connected with digital oscilloscope, and described digital oscilloscope is for measuring the output voltage amplitude of described inductive coil;
With the VSA that the transmitting terminal of radio-frequency (RF) identification tester is connected, described VSA is for obtaining modulation index, frequency error and the signal output waveform parameter of radio-frequency (RF) identification tester;
The signal generator being connected with the receiving end of radio-frequency (RF) identification tester, for to radio-frequency (RF) identification tester output power value and reader signal, the output terminal of described signal generator is connected with the input end of described receiving end and microwave power meter respectively.
2. radio-frequency (RF) identification tester calibration device as claimed in claim 1, is characterized in that, described inductive coil is PCD antenna sets or VCD antenna sets.
3. radio-frequency (RF) identification tester calibration device as claimed in claim 2, is characterized in that, for the radio-frequency (RF) identification tester that meets ISO/IEC14443 standard, described inductive coil is PCD antenna sets.
4. radio-frequency (RF) identification tester calibration device as claimed in claim 2, is characterized in that, for the radio-frequency (RF) identification tester that meets ISO/IEC15693 standard, described inductive coil is VCD antenna sets.
5. a radio-frequency (RF) identification tester calibration steps, is characterized in that, adopts the radio-frequency (RF) identification tester calibration device as described in claim 1～4 any one, and described method comprises:
Arrange after the output frequency and output power of radio-frequency (RF) identification tester, radio-frequency (RF) identification tester is exported signal continuous, that do not add modulation by attenuator to frequency meter, reads the count value of described output frequency from frequency meter;
Arrange after the output frequency and output power of radio-frequency (RF) identification tester, radio-frequency (RF) identification tester is exported signal continuous, that do not add modulation by attenuator to microwave power meter, read the count value of described output power from microwave power meter, determine the output power of radio-frequency (RF) identification tester according to the pad value of the count value of described output power and attenuator;
The input impedance of described digital oscilloscope is chosen as to high resistant, arrange after the output signal field intensity of radio-frequency (RF) identification tester, radio-frequency (RF) identification tester is exported signal continuous, that do not add modulation to inductive coil, adjust the time scale of digital oscilloscope and the position that voltage scale arrives, regulate digital oscilloscope vertical size and after sweep time, read the output voltage amplitude of the described inductive coil of described digital oscilloscope measurement, determine the output field intensity of radio-frequency (RF) identification tester according to described output voltage amplitude;
Be reader simulator state by the condition selecting of radio-frequency (RF) identification tester, the centre frequency of setting radio-frequency (RF) identification tester is 915MHz, after output power is 0dBm, radio-frequency (RF) identification tester is to VSA output signal, be radio-frequency (RF) identification analysis by the condition selecting of VSA, the centre frequency of setting VSA is 915MHz, output level is that 0dBm and triggering mode are intermediate frequency amplitude and select forward direction and corresponding speed, and select the analysis result of VSA for after ordering, gather from the result kind of VSA the modulation index that reads radio-frequency (RF) identification tester picture, frequency error and signal output waveform parameter,
After the output frequency and output level of setting signal generator, signal generator output continuous wave signal, from the output power of described microwave power meter read signal generator, the output power of holding signal generator is constant and to described radio-frequency (RF) identification tester output, the duty of radio-frequency (RF) identification tester is selected to power measurement, the receive frequency of radio-frequency (RF) identification tester is set to the frequency identical with the output frequency of described signal generator, expection incoming level is set to be greater than or equal to after the output power of the signal generator that described microwave power meter reads, from radio-frequency (RF) identification tester, read the received power receiving from described signal generator,
The centre frequency that described signal generator is set is 915MHz, output power is 0dBm, and select output type be simulation reader signal and trigger type be single trigger, select the reader uniformity test panel in radio-frequency (RF) identification tester, and the centre frequency of radio-frequency (RF) identification tester is 915MHz, analysis level is 0dBm, trigger mode is set for analyzing after rising edge triggering, the key that obtains of pressing radio-frequency (RF) identification tester obtains signal, trigger signal generator is to send a reader signal to radio-frequency (RF) identification tester, radio-frequency (RF) identification tester obtains reader analytic signal to sampling the reader signal select time scope obtaining and analyzing, from described reader analytic signal, read modulation index.
6. radio-frequency (RF) identification tester calibration steps as claimed in claim 5, it is characterized in that, determine according to the pad value of the count value of described output power and attenuator in the step of output power of radio-frequency (RF) identification tester, the output power of described radio-frequency (RF) identification tester is pressed following formula and is determined:
Ps=P+A，
Wherein, Ps represents the output power of radio-frequency (RF) identification tester, and unit is dBm, and P represents power meter reading, and unit is dBm, and A represents the pad value of attenuator, and unit is dB.
7. radio-frequency (RF) identification tester calibration steps as claimed in claim 5, is characterized in that, determines in the step of output field intensity of radio-frequency (RF) identification tester according to described output voltage amplitude, determines the output field intensity of radio-frequency (RF) identification tester according to following formula:
H=V/ｋ
Ｃ，
Wherein, H is the output field intensity of radio-frequency (RF) identification tester, the A/m of unit, and V is the output voltage amplitude of the inductive coil of described digital oscilloscope measurement, unit is mVp-p, k
cfor the correction factor of described inductive coil.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104849687A (en) * | 2015-04-23 | 2015-08-19 | 中国电子科技集团公司第四十一研究所 | Microwave automatic test system calibration method based on scattering parameter cascading |
| CN105262551A (en) * | 2015-11-25 | 2016-01-20 | 上海市计量测试技术研究院 | Wireless signal tester calibration device and method, and automatic testing system and method |
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| CN105577295A (en) * | 2014-10-14 | 2016-05-11 | 中国科学院上海高等研究院 | Testing system and method for wireless signal attenuation performance in enclosed space |
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| CN105954690A (en) * | 2016-06-13 | 2016-09-21 | 公安部第研究所 | Magnetic field intensity metering method for energy testing simulation card |
| CN106841861A (en) * | 2017-01-11 | 2017-06-13 | 北京交通大学 | Cable recognition methods and system |
| CN109901459A (en) * | 2018-12-19 | 2019-06-18 | 北京航天计量测试技术研究所 | A kind of calibration system of servo simulator |
| CN113589013A (en) * | 2021-08-12 | 2021-11-02 | 深圳市鼎阳科技股份有限公司 | Signal excitation device of oscilloscope probe and oscilloscope calibration system |
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