CN101706863A - Method and device for testing receiving sensitivity of RFID reader and reader thereof - Google Patents
Method and device for testing receiving sensitivity of RFID reader and reader thereof Download PDFInfo
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- CN101706863A CN101706863A CN200910193541A CN200910193541A CN101706863A CN 101706863 A CN101706863 A CN 101706863A CN 200910193541 A CN200910193541 A CN 200910193541A CN 200910193541 A CN200910193541 A CN 200910193541A CN 101706863 A CN101706863 A CN 101706863A
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Abstract
The invention relates to a method and a device for testing the receiving sensitivity of an ultra-high frequency passive RFID reader and the reader thereof. The testing method comprises the following steps: the reader sends a local oscillation carrier signal, and simultaneously carries out signal listening; a tag response signal simulator obtains the local oscillation carrier signal from the reader by direct coupling, a modulation unit carries out modulation on the local oscillation carrier signal for obtaining the modulated signal, a variable attenuator attenuates the modulated signal, then a power divider divides the attenuated signal into a first-path tag simulated signal and a second-path tag simulated signal in an equal manner, the first-path tag simulated signal is inputted into a power meter for testing the power value through the power meter, the second-path tag simulated signal is transmitted back to the reader, when the reader receives the minimum simulated tag response signal under the specified bit error rate, the power of the first-path tag simulated signal tested by the power meter is the receiving sensitivity of the reader. The technical scheme can accurately, conveniently and rapidly test the receiving sensitivity of the RFID reader.
Description
Technical field
The present invention relates to radio-frequency (RF) identification (RFID) field, particularly a kind of method, equipment and reader thereof of testing ultra-high-frequency passive RFID reader receiving sensitivity.
Background technology
REID (Radio Frequency Identification is called for short RFID) is a kind of contactless automatic identification technology, and it is by the go forward side by side line data exchange of the automatic recognition objective object of radiofrequency signal.The ultra-high-frequency passive rfid system then is the automatic identification technology that utilizes electromagnetic transmission and the anti-phase scattering technology principle of electromagnetic wave to communicate between a reader and the label, and frequency of operation is distributed in 840MHz～960MHz, hereinafter to be referred as uhf band.UHF passive RFID technology since its at cost, comprise information, can maintain secrecy, the advantage of aspect such as automaticity height, be widely used in every field in countries in the world, comprise industries such as manufacturing, logistics, retail, traffic.Passive RFID system is meant that electronic tag is a passive label, passive label does not have internal battery, in the time of outside the reading range of reader, label is in passive states, and label extracts the required electric energy of its work in the time of within the reading range of reader from the radio-frequency (RF) energy that reader sends.
The UHF passive RFID system generally comprises three parts and forms reader, antenna, electronic tag.
Be mainly two communication processs between reader and the label, first communication process is that reader utilizes electromagnetic wave to send the signal of modulation to label, this moment, electronic tag obtained energy from electromagnetic wave, and the signal of demodulation reader emission, obtained the instruction of reader; Second process is in the tag responses state of waiting for, and sends continuous carrier after to be reader with order send to label; This moment label then the mode by backscattering (Backscatter) send signal and reply reader.Repeat above two processes and finish reader and the mutual whole process of label.
Label generally includes two parts by the scattering of antenna: a part is and the irrelevant structure item scattered field of scattering antenna load situation, it is because the scattered field that induction current or displacement current produced of incident plane wave on antenna structure, its scattering mechanism is identical with common scattered field mechanism, another part then is the schema entry scattered field of the antenna that changes with the antenna load situation, it is owing to load and antenna do not match the power that reflects through the antenna scattered field that produces of radiation again, and this is that antenna is as a loading scatterer and distinctive scattering.Label just by controlling power or the phase place that changes scattered signal with the antenna load impedance situation, is finished modulation to the carrier wave of reader emission.Like this reader receive the back-scattered signal of label be and the reader local oscillation signal fully with ASK or psk modulation signal frequently.
The receiving sensitivity of reader is the most basic, the most important index of ultra-high-frequency passive rfid system performance.Because the RFID technology belongs to a new technology, the RFID spectrum analyzer that present instrument test supplier is provided does not have the function of the BER of test, be merely able to the signal of reader emission or label scattering is received and analyzes, can not directly assess the receptivity of reader.
In the prior art, method of testing about the receiver sensitivity of reader, normally adopt an outside source as the emissive source simulating transmitting machine, communication mode according to system carries out identical frequency spectrum setting and modulation system and sends packet, directly or indirectly send to equipment under test then, equipment under test carries out received signal processing such as demodulating and decoding to signal.When the bit error rate or frame error rate were no more than the value of certain appointment, minimum received power was a receiving sensitivity.
Utilize prior art test ultra-high-frequency passive RFID reader receiving sensitivity, there is such shortcoming, the tag responses reader is to adopt backscatter technique, so the back-scattered signal of the label that reader receives is and the reader local oscillation signal fully with ASK or psk modulation signal frequently. use transmit back-scattered signal in the time of can't simulating the tag responses reader of existing outside source, and the receiving circuit of present considerable ultra-high-frequency passive RFID reader adopts the zero intermediate frequency reception programme, therefore, method of testing of the prior art can't carry out effectively and accurately measuring to the receiving sensitivity of ultra-high-frequency passive RFID reader.
Therefore,, be necessary to provide a kind of method and equipment and corresponding reader of testing receiving sensitivity of RFID reader at the prior art deficiency, so as can be more accurate, more convenient, the receiving sensitivity of testing RFID reader more quickly.
Summary of the invention
The objective of the invention is to avoid weak point of the prior art and a kind of method of testing receiving sensitivity of RFID reader and equipment and corresponding reader be provided, so as can be accurately, the receiving sensitivity of testing RFID reader quickly and easily.
Purpose of the present invention is achieved through the following technical solutions:
A kind of method of testing receiving sensitivity of RFID reader comprises:
Reader emission local oscillator carrier signal is carried out signal simultaneously and is intercepted;
The tag responses signal simulator directly is coupled from described reader and obtains described local oscillator carrier signal, the modulating unit of described tag responses signal simulator is modulated the acquisition modulation signal to described local oscillator carrier signal, the variable attenuator of described tag responses signal simulator is decayed to described modulation signal, and the signal after the power splitter of described tag responses signal simulator will be decayed is halved and formed first via label simulating signal and second road sign label simulating signal that power equates;
Described power splitter inputs to power meter with first via label simulating signal, and described second road sign label simulating signal is inputed to circulator, and described circulator is signed simulating signal with described second road sign and imported described reader;
When described reader received minimum second road sign label simulating signal, the power of the first via label simulating signal of described power meter test this moment was the reader receiving sensitivity.
Further, the coupling mechanism that above-mentioned reader is provided with is connected with described tag responses signal simulator, and described coupling mechanism carries described local oscillator carrier signal to described tag responses signal simulator.
Further, the coupling mechanism of above-mentioned reader setting is carried the described modulating unit of described local oscillator carrier signal to described tag responses signal simulator.
Preferably, above-mentioned modulating unit modulation that described local oscillator carrier signal is carried out, the decay that described variable attenuator carries out described modulation signal are to control by the mode of software control to carry out.
Preferred, the decay that the modulation that above-mentioned modulating unit carries out described local oscillator carrier signal, described variable attenuator carry out described modulation signal is to be undertaken by the software control unit controls of described tag responses signal simulator.
A kind of equipment that is used for testing receiving sensitivity of RFID reader, described equipment comprises reader, the tag responses signal simulator, power meter and circulator, described reader comprises Base-Band Processing and control circuit and radio circuit, described Base-Band Processing and control circuit are connected with described radio circuit, described radio circuit comprises the local oscillation signal source, radiating circuit, coupling mechanism and receiving circuit, the output terminal in described local oscillation signal source is connected with the input end of described coupling mechanism, the output terminal of described coupling mechanism is connected with the input end of described radiating circuit, described receiving circuit is connected with described Base-Band Processing and control circuit, described coupling mechanism is provided with the local oscillation signal output terminal, described local oscillation signal output terminal is connected with the input end of described tag responses signal simulator
Described tag responses signal simulator comprises the software control unit, modulating unit, variable attenuator and power splitter, the input end of described modulating unit is connected with the described local oscillation signal output terminal of described coupling mechanism, the output terminal of described modulating unit is connected with the input end of described variable attenuator, described software control unit is provided with first control end and second control end, described first control end is connected with described modulating unit, described second control end is connected with described variable attenuator, the output terminal of described variable attenuator is connected with described power splitter, described power splitter is provided with first output terminal and second output terminal, first output terminal of described power splitter is connected with described power meter, second output terminal of described power splitter is connected with the input end of described circulator, and the output terminal of described circulator is connected with the input end of described reader.
Further, above-mentioned reader is provided with the local oscillation signal port, and an end of described local oscillation signal port links to each other with the described local oscillation signal output terminal of described coupling mechanism, and the other end of described local oscillation signal port is connected with the input end of described modulating unit.
A kind of reader, comprise Base-Band Processing and control circuit, radio circuit, described Base-Band Processing and control circuit are connected with described radio circuit, described reader is provided with a local oscillation signal port, described radio circuit comprises the local oscillation signal source, coupling mechanism, radiating circuit and receiving circuit, the output terminal in described local oscillation signal source is connected with the input end of described coupling mechanism, the output terminal of described coupling mechanism is connected with the input end of described radiating circuit, described receiving circuit is connected with described Base-Band Processing and control circuit, described coupling mechanism also is provided with the local oscillation signal output terminal, and described local oscillation signal output terminal is connected with described local oscillation signal port.
The method of a kind of testing receiving sensitivity of RFID reader of the present invention, directly be coupled from described reader by the tag responses signal simulator and obtain described local oscillator carrier signal, modulating unit by described tag responses signal simulator is modulated the acquisition modulation signal to described local oscillator carrier signal, by the variable attenuator of described tag responses signal simulator described modulation signal is decayed then, signal after decay is halved by power splitter and is formed first via label simulating signal and second road sign label simulating signal that power equates, the first via label simulating signal power input meter of power splitter is also tested its performance number by power meter, second road sign of power splitter is signed simulating signal and is delivered to circulator, circulator is connected with reader, receive described second road sign by described reader and sign simulating signal, during the simulation tag responses signal of the minimum that receives when described reader, this moment power meter measured power be the reader receiving sensitivity.The method of testing receiving sensitivity of RFID reader provided by the invention, local oscillator carrier signal by direct coupling reader, and simulate label this local oscillator carrier signal is handled, import reader to be measured then, record the receiving sensitivity of reader to be measured, therefore, back-scattered signal in the time of can simulating the tag responses reader, it is more accurate to test, and can directly test the receiving sensitivity that obtains reader by this method of testing, therefore, test is more convenient, faster.
A kind of equipment that is used for testing receiving sensitivity of RFID reader provided by the invention, comprise reader, the tag responses signal simulator, circulator and power meter, described reader comprises Base-Band Processing and control circuit and radio circuit, described Base-Band Processing and control circuit are connected with described radio circuit, described radio circuit comprises the local oscillation signal source, radiating circuit, coupling mechanism and receiving circuit, the output terminal in described local oscillation signal source is connected with the input end of described coupling mechanism, the output terminal of described coupling mechanism is connected with the input end of described radiating circuit, described receiving circuit is connected with described Base-Band Processing and control circuit, described coupling mechanism is provided with the local oscillation signal output terminal, described local oscillation signal output terminal is connected with the input end of described tag responses signal, described tag responses signal simulator comprises the software control unit, modulating unit, variable attenuator and power splitter, the input end of described software control unit is connected with the described local oscillation signal output terminal of described coupling mechanism, the output terminal of described modulating unit is connected with the input end of described variable attenuator, described software control unit is provided with first control end and second control end, described first control end is connected with described modulating unit, described second control end is connected with described variable attenuator, the output terminal of described variable attenuator is connected with described power splitter, described power splitter is provided with first output terminal and second output terminal, first output terminal of described power splitter is connected with described power meter, second output terminal of described power splitter is connected with the input end of described circulator, the output terminal of described circulator is connected with the input end of described reader. therefore, the coupling mechanism of described tag responses signal simulator by described reader directly is coupled and obtains the local oscillator carrier signal, and the simulation label is modulated and attenuation processing described local oscillator carrier signal, the described modulating unit of described software control unit controls is modulated the acquisition modulation signal to described local oscillator carrier signal, the described variable attenuator of described software control unit controls is decayed to described modulation signal, signal after decay is halved by power splitter and is formed first via label simulating signal and second road sign label simulating signal that power equates, described second road sign is signed simulating signal and is transported to described reader, described first via label simulating signal is by described power meter measured power, the power of second road sign label simulating signal of the minimum that reader received is the receiving sensitivity of reader to be measured. therefore, back-scattered signal in the time of can simulating the tag responses reader, it is more accurate to test, can directly test the receiving sensitivity that obtains reader by this method of testing, therefore, test is more convenient, it is faster.
A kind of reader of the present invention, comprise Base-Band Processing and control circuit, radio circuit, described Base-Band Processing and control circuit are connected with described radio circuit, described reader is provided with a local oscillation signal port, described radio circuit comprises the local oscillation signal source, coupling mechanism, radiating circuit and receiving circuit, the output terminal in described local oscillation signal source is connected with the input end of described coupling mechanism, the output terminal of described coupling mechanism is connected with the input end of described radiating circuit, described coupling mechanism also is provided with the local oscillation signal output terminal, and described local oscillation signal output terminal is connected with described local oscillation signal port.Because this reader is provided with the local oscillation signal port, therefore, the local oscillator carrier signal that reader itself can be produced by the local oscillation signal source of this port output reader is tested accurate, convenient, fast.
Description of drawings
The present invention is further illustrated in conjunction with the accompanying drawings, but the content in the accompanying drawing does not constitute any limitation of the invention.
Fig. 1 is the synoptic diagram of the method for a kind of testing receiving sensitivity of RFID reader of the present invention;
Fig. 2 is embodiment 2 structural representations of the equipment of a kind of testing receiving sensitivity of RFID reader of the present invention;
Fig. 3 is embodiment 3 structural representations of the equipment of a kind of testing receiving sensitivity of RFID reader of the present invention.
Embodiment
The invention will be further described with the following Examples.
Embodiment 1
A kind of method of testing receiving sensitivity of RFID reader, as shown in Figure 1, obtaining transmitting of reader 1 by the 2 direct couplings of tag responses signal simulator is the local oscillator carrier signal, and after handling by 2 pairs of local oscillator carrier signals of tag responses signal simulator, signal after the processing is back to reader 1 by circulator 5 emissions, the power of the simulation tag responses signal of the minimum that reader 1 receives is the receiving sensitivity of reader 1 to be measured. and reader 1 is provided with coupling mechanism 11, coupling mechanism 11 is provided with modulating unit 21 with the direct input label answer signal of local oscillator carrier signal simulator 2. tag responses signal simulators 2, variable attenuator 22, software control unit 24 and power splitter 23. readers 1 send the local oscillator carrier signal, intercept the tag responses signal simultaneously; Tag responses signal simulator 2 directly is coupled from reader 1 and obtains the local oscillator carrier signal, the simulation label is modulated the local oscillator carrier signal and is decayed under the regulating and controlling of software control unit 24, above-mentioned local oscillator carrier signal carries out ASK by modulating unit 21 or PSK modulation back obtains modulation signal, decay by 22 pairs of modulation signals of variable attenuator then, signal bisection after the power splitter 23 of tag responses signal simulator 2 will be decayed forms the equal first via label simulating signal 31 of power and second road sign label simulating signal, 32. power splitters 23 input to power meter 3 with first via label simulating signal 31, by power meter 3 its power of test, power splitter 23 is signed simulating signal 32 with second road sign and is inputed to circulator 5, circulator 5 is signed second road sign simulating signal 32 input readers 1. power meters 3 measured performance numbers again and is equated substantially with the power that is sent to reader 1 receiving port, only differ the loss of circulator 5, regulation according to the RFID reader, when inserting loss less than 0.5dB, can ignore, second road sign of the minimum that reader 1 receives is signed the power of simulating signal 32 and can be tested by power meter 3. under the condition of specifying the bit error rate, when reader 1 received the second tunnel minimum simulation tag responses signal 32, the power of the first via label simulating signal 31 of power meter 3 tests this moment was reader 1 receiving sensitivity.
The method of testing receiving sensitivity of RFID reader provided by the invention, owing to be local oscillator carrier signal by direct coupling reader 1, and the simulation label is handled this local oscillator carrier signal, treated signal: second road sign is signed simulating signal 32 inputs reader 1 to be measured, simultaneously first via label simulating signal 32 is tested the receiving sensitivity that obtains reader 1 to be measured.Therefore, the back-scattered signal in the time of can simulating the tag responses reader, it is more accurate to test, and can directly test the receiving sensitivity that obtains reader by this method of testing, therefore, tests more convenient, faster.
Embodiment 2
Referring to Fig. 2, a kind of equipment that is used for testing receiving sensitivity of RFID reader comprises reader 200, tag responses signal simulator 220, power meter 230 and circulator 250.
Reader 200 sends the local oscillator carrier signal, intercept the tag responses signal simultaneously, reader 200 comprises Base-Band Processing and control circuit 201 and radio circuit 202, Base-Band Processing and control circuit 201 are connected with radio circuit 202, Base-Band Processing and control circuit 201 control radio circuits 202 transmit or carry out received signal, and radio circuit 202 comprises local oscillation signal source 203, radiating circuit 204, is arranged at coupling mechanism 211, receiving circuit 205 between local oscillation signal source 203 and the radiating circuit 204.Reader 200 is provided with emitting antenna port 208, the emitting antenna 209 corresponding with emitting antenna port 208, receiving antenna port 206, the receiving antenna 240 corresponding with receiving antenna port 206.The output terminal in local oscillation signal source 203 is connected with the input end of coupling mechanism 211, the output terminal of coupling mechanism 211 is connected with the input end of radiating circuit 204, receiving circuit 205 is connected with Base-Band Processing and control circuit 201, when transmitting, the local oscillation signal that local oscillation signal source 203 produces by radiating circuit 204 emissions, transmits the local oscillator carrier signals to emitting antenna 209 and by emitting antenna 209 emissions from the port 208 that transmits behind coupling mechanism 211; During reception, the signal of tag reflection inputs to reader 200 after receiving by receiving antenna 240.For the ease of test, coupling mechanism 211 is provided with local oscillation signal output terminal 210, local oscillation signal output terminal 210 is connected with the input end of tag responses signal simulator 220, and the local oscillation signal output terminal 210 of coupling mechanism 211 inputs to tag responses signal simulator 220 with the local oscillation signal that local oscillation signal source 203 produces.Correspondingly, reader 200 is provided with a local oscillation signal port 207, these local oscillation signal port 207 1 ends are connected with the local oscillation signal output terminal 210 of coupling mechanism 211, the other end of local oscillation signal port 207 is connected with the input end of tag responses signal simulator 220, is used for directly exporting the local oscillator carrier signal that local oscillation signal source 203 produces.
Tag responses signal simulator 220 comprises software control unit 224, modulating unit 221, variable attenuator 222 and power splitter 223, the input end of modulating unit 221 is connected with the local oscillation signal port 207 of reader 200, the output terminal of modulating unit 221 is connected with the input end of variable attenuator 222, software control unit 224 is provided with first control end and second control end, first control end is connected with modulating unit 221, second control end is connected with variable attenuator 222, the output terminal of variable attenuator 222 is connected with power splitter 223, power splitter 223 is provided with first output terminal and second output terminal, first output terminal of power splitter 223 is connected with power meter 230, second output terminal of power splitter 223 is connected with the input end of circulator 250, and the output terminal of circulator 250 is connected with the input end of reader 200.
The local oscillation signal port 207 of tag responses signal simulator 220 by reader 200 directly coupling obtains the local oscillator carrier signals and simulates label the local oscillator carrier signal is modulated and attenuation processing. and software control unit 221 pairs of local oscillator carrier signals of 224 control modulating units of tag responses signal simulator 220 are modulated the acquisition modulation signal, software control unit 222 pairs of modulation signals of 224 control variable attenuators are decayed, signal after decay is halved by power splitter 223 and is formed first via label simulating signal 231 and second road sign label simulating signal 232 that power equates, second road sign label simulating signal 232 is delivered to circulator 250 by second output terminal of power splitter 223, input to reader 200 by circulator 250, first via label simulating signal 231 is delivered to power meter 230 by first output terminal of power splitter 223, by power meter 230 its power of test. power meter 230 measured performance numbers equate substantially with the power that is sent to reader 200 receiving antenna ports 206, only differ the loss of circulator 250, regulation according to the RFID reader, when inserting loss less than 0.5dB, can ignore, therefore, under the condition of specifying the bit error rate, when second road sign of the minimum that receives when reader 200 was signed simulating signal 232, the power of the first via label simulating signal 231 that is detected by power meter 230 was the receiving sensitivity of reader 200.
By this equipment, the tag responses signal simulator 220 local oscillator carrier signal that reader 200 is launched that can the coupling mechanism 211 by reader 200 directly be coupled, and the simulation label is handled this local oscillator carrier signal, second road sign is signed simulating signal 232 inputs reader 200 to be measured, obtain the receiving sensitivity of reader 200 to be measured simultaneously by the power of test first via label simulating signal 231, therefore, can simulate the back-scattered signal of tag responses reader, it is more accurate to test, can directly test the receiving sensitivity that obtains reader by this method of testing, therefore, test is more convenient, faster.
A kind of equipment that is used for testing receiving sensitivity of RFID reader provided by the invention, its reader 200 is provided with local oscillation signal port 207, be provided with coupling mechanism 211 between the local oscillation signal source 203 of its radio circuit 202 and the radiating circuit 204, local oscillation signal port 207 links to each other with the local oscillation signal output terminal 210 of coupling mechanism 211, therefore, can directly export the local oscillator carrier signal of reader 200 by this local oscillation signal port 207.Therefore, when the sensitivity of test reader, the local oscillator carrier signal that can be produced by the local oscillation signal source 203 of local oscillation signal port 207 direct output readers 200 makes and tests more convenient and quicker that test result is more accurate.
Need to prove that a kind of equipment that is used for testing receiving sensitivity of RFID reader of the present invention, its reader 200 can be the readers 200 that emission and received signal port separate, also can be the reader 200 of emission and the shared port of received signal.
Embodiment 3
Referring to Fig. 3, a kind of equipment that is used for testing receiving sensitivity of RFID reader comprises reader 300, tag responses signal simulator 320, power meter 330, reader 300 and circulator 350.
Reader 300 sends the local oscillator carrier signal, intercept the tag responses signal simultaneously, reader 300 comprises Base-Band Processing and control circuit 301 and radio circuit 302, Base-Band Processing and control circuit 301 are connected with radio circuit 302, Base-Band Processing and control circuit 301 control radio circuits 302 transmit or carry out received signal, radio circuit 302 comprises local oscillation signal source 303, radiating circuit 304, be arranged at the coupling mechanism 311 between local oscillation signal source 303 and the radiating circuit 304, receiving circuit 305, the output terminal in local oscillation signal source 303 is connected with the input end of coupling mechanism 311, the output terminal of coupling mechanism 311 is connected with the input end of radiating circuit 304, receiving circuit 305 is connected with Base-Band Processing and control circuit 301. and reader 300 is the reader 300 of the shared port of receiving and transmitting signal, this reader 300 is provided with a receipts/antenna port 306, be provided with antenna 340. by receiving/send out antenna port 306 and antenna 340 to receiving/send out antenna port 306, reader 300 can be launched the local oscillator carrier signal or be used to receive the reflected signal of label. when Base-Band Processing and control circuit 301 output signals transmit radio circuit 302, the local oscillation signal that local oscillation signal source 303 produces is launched by radiating circuit 304 after coupling mechanism 311 is handled, from receiving/transmit port 306 emissions, by emitting antenna 340 emissions; During reception, the reflected signal of label receives by antenna 340, input to reader 300. for the ease of test by receiving/send out antenna port 306, coupling mechanism 311 is provided with local oscillation signal output terminal 310, local oscillation signal output terminal 310 is connected with the input end of tag responses signal simulator 320, the local oscillation signal output terminal 310 of coupling mechanism 311 inputs to tag responses signal simulator 320. correspondingly with the local oscillation signal that local oscillation signal source 303 produces, reader 300 is provided with a local oscillation signal port 307, these local oscillation signal port 307 1 ends are connected with the local oscillation signal output terminal 310 of coupling mechanism 311, the other end of local oscillation signal port 307 is connected with the input end of tag responses signal simulator 320, is used for directly exporting the local oscillator carrier signal that local oscillation signal source 303 produces.
Tag responses signal simulator 320 comprises software control unit 324, modulating unit 321, variable attenuator 322 and power splitter 323, the input end of modulating unit 321 is connected with the local oscillation signal port 307 of reader 300, the output terminal of modulating unit 321 is connected with the input end of variable attenuator 322, software control unit 324 is provided with first control end and second control end, first control end is connected with modulating unit 321, second control end is connected with variable attenuator 322, the output terminal of variable attenuator 322 is connected with power splitter 323, power splitter 323 is provided with first output terminal and second output terminal, first output terminal of power splitter 323 is connected with power meter 330, second output terminal of power splitter 323 is connected with the input end of circulator 350, and the output terminal of circulator 350 is connected with the input end of reader 300.
The local oscillation signal port 307 of tag responses signal simulator 320 by reader 300 directly coupling obtains the local oscillator carrier signals and simulates label the local oscillator carrier signal is modulated and attenuation processing.Software control unit 321 pairs of local oscillator carrier signals of 324 control modulating units of tag responses signal simulator 320 are modulated the acquisition modulation signal, software control unit 322 pairs of modulation signals of 324 control variable attenuators are decayed, signal after decay is halved by power splitter 323 and is formed first via label simulating signal 331 and second road sign label simulating signal 332 that power equates, second road sign label simulating signal 332 is delivered to circulator 350 by second output terminal of power splitter 323, input to reader 300 by circulator 350, first via label simulating signal 331 is delivered to power meter 330 by first output terminal of power splitter 323, by power meter 330 its power of test.Power meter 330 measured performance numbers equate substantially with the power that is sent to reader 300 a receipts/antenna port 306, only differ the loss of circulator 350, regulation according to the RFID reader, when inserting loss less than 0.5dB, can ignore, therefore, under the condition of specifying the bit error rate, when second road sign of the minimum that receives when reader 300 was signed simulating signal 332, the power of the first via label simulating signal 331 that is detected by power meter 330 was the receiving sensitivity of reader 300.
By this equipment, the tag responses signal simulator 320 local oscillator carrier signal that reader 300 is launched that can the coupling mechanism 311 by reader 300 directly be coupled, and the simulation label is handled this local oscillator carrier signal, second road sign is signed simulating signal 332 inputs reader 300 to be measured, thereby obtain the receiving sensitivity of reader 300 to be measured simultaneously by the power of test first via label simulating signal 231, therefore, back-scattered signal in the time of can simulating the tag responses reader, it is more accurate to have test, can directly test the receiving sensitivity that obtains reader by this method of testing, therefore, test is more convenient, faster.
A kind of equipment that is used for testing receiving sensitivity of RFID reader provided by the invention, its reader 300 is provided with local oscillation signal port 307, be provided with coupling mechanism 311 between the local oscillation signal source 303 of its radio circuit 302 and the radiating circuit 304, local oscillation signal port 307 links to each other with the local oscillation signal output terminal 310 of coupling mechanism 311, therefore, can directly export the local oscillator carrier signal of reader 300 by this local oscillation signal port 307.Therefore, when the sensitivity of test reader 300, can directly export the local oscillator carrier signal of reader 300, make and test more convenient and quicker that test result is more accurate by this port.
Should be noted that at last; above embodiment is only in order to illustrate technical scheme of the present invention but not limiting the scope of the invention; although the present invention has been done detailed description with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the essence and the scope of technical solution of the present invention.
Claims (8)
1. the method for a testing receiving sensitivity of RFID reader is characterized in that, comprising:
Reader emission local oscillator carrier signal is carried out signal simultaneously and is intercepted;
The tag responses signal simulator directly is coupled from described reader and obtains described local oscillator carrier signal, the modulating unit of described tag responses signal simulator is modulated the acquisition modulation signal to described local oscillator carrier signal, the variable attenuator of described tag responses signal simulator is decayed to described modulation signal, and the signal after the power splitter of described tag responses signal simulator will be decayed is halved and formed first via label simulating signal and second road sign label simulating signal that power equates;
Described power splitter inputs to power meter with first via label simulating signal, and described second road sign label simulating signal is inputed to circulator, and described circulator is signed simulating signal with described second road sign and imported described reader;
When described reader received minimum second road sign label simulating signal, the power of the first via label simulating signal of described power meter test this moment was the reader receiving sensitivity.
2. the method for a kind of testing receiving sensitivity of RFID reader according to claim 1, it is characterized in that: the coupling mechanism that described reader is provided with is connected with described tag responses signal simulator, and described coupling mechanism carries described local oscillator carrier signal to described tag responses signal simulator.
3. the method for a kind of testing receiving sensitivity of RFID reader according to claim 2 is characterized in that: the coupling mechanism of described reader setting is carried the described modulating unit of described local oscillator carrier signal to described tag responses signal simulator.
4. the method for a kind of testing receiving sensitivity of RFID reader according to claim 3, it is characterized in that: the decay that the modulation that described modulating unit carries out described local oscillator carrier signal, described variable attenuator carry out described modulation signal is to control by the mode of software control to carry out.
5. the method for a kind of testing receiving sensitivity of RFID reader according to claim 4, it is characterized in that: the decay that the modulation that described modulating unit carries out described local oscillator carrier signal, described variable attenuator carry out described modulation signal is to be undertaken by the software control unit controls of described tag responses signal simulator.
6. equipment that is used for testing receiving sensitivity of RFID reader, it is characterized in that: described equipment comprises reader, the tag responses signal simulator, power meter and circulator, described reader comprises Base-Band Processing and control circuit and radio circuit, described Base-Band Processing and control circuit are connected with described radio circuit, described radio circuit comprises the local oscillation signal source, radiating circuit, coupling mechanism and receiving circuit, the output terminal in described local oscillation signal source is connected with the input end of described coupling mechanism, the output terminal of described coupling mechanism is connected with the input end of described radiating circuit, described receiving circuit is connected with described Base-Band Processing and control circuit, described coupling mechanism is provided with the local oscillation signal output terminal, described local oscillation signal output terminal is connected with the input end of described tag responses signal simulator
Described tag responses signal simulator comprises the software control unit, modulating unit, variable attenuator and power splitter, the input end of described modulating unit is connected with the described local oscillation signal output terminal of described coupling mechanism, the output terminal of described modulating unit is connected with the input end of described variable attenuator, described software control unit is provided with first control end and second control end, described first control end is connected with described modulating unit, described second control end is connected with described variable attenuator, the output terminal of described variable attenuator is connected with described power splitter, described power splitter is provided with first output terminal and second output terminal, first output terminal of described power splitter is connected with described power meter, second output terminal of described power splitter is connected with the input end of described circulator, and the output terminal of described circulator is connected with the input end of described reader.
7. a kind of equipment that is used for testing receiving sensitivity of RFID reader according to claim 6, it is characterized in that: described reader is provided with the local oscillation signal port, one end of described local oscillation signal port links to each other with the described local oscillation signal output terminal of described coupling mechanism, and the other end of described local oscillation signal port is connected with the input end of described modulating unit.
8. reader, comprise Base-Band Processing and control circuit, radio circuit, described Base-Band Processing and control circuit are connected with described radio circuit, it is characterized in that: described reader is provided with a local oscillation signal port, described radio circuit comprises the local oscillation signal source, coupling mechanism, radiating circuit and receiving circuit, the output terminal in described local oscillation signal source is connected with the input end of described coupling mechanism, the output terminal of described coupling mechanism is connected with the input end of described radiating circuit, described receiving circuit is connected with described Base-Band Processing and control circuit, described coupling mechanism also is provided with the local oscillation signal output terminal, and described local oscillation signal output terminal is connected with described local oscillation signal port.
Priority Applications (1)
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