CN102982297B - Label test system - Google Patents
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- CN102982297B CN102982297B CN201210379574.5A CN201210379574A CN102982297B CN 102982297 B CN102982297 B CN 102982297B CN 201210379574 A CN201210379574 A CN 201210379574A CN 102982297 B CN102982297 B CN 102982297B
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Abstract
The invention relates to a label test system. The label test system comprises a radio-frequency signal device for producing a sending signal and processing a signal offset by a carrier wave, a power amplifier for processing the sending signal to obtain an amplified signal, a carrier wave offsetting device for processing the amplified sending signal to obtain an adjusted signal and superposing the adjusted signal and a receiving signal to obtain the signal offset by the carrier wave, a sending device connected with the carrier wave offsetting device and for sending the amplified sending signal to a tested label, and a receiving device for obtain the receiving signal. The label test system utilizes the carrier wave offsetting device to offset an interference signal in the receiving signal so as to enable the radio-frequency signal device to obtain test data and identify the tested label.
Description
Technical field
The present invention relates to a kind of signal processing technology, particularly relate to a kind of tag test system.
Background technology
Radio RF recognition technology (Radio Frequency Identification, RFID), be a kind of non-contact automatic identification technology utilizing radio communication to realize, utilize the automatic identifying that the transport property of high-frequency electromagnetic signal and Space Coupling have come target object.In RFID label tag test macro, radiofrequency signal equipment produces radiofrequency signal, radiofrequency signal is sent to tested label, label information is modulated in radiofrequency signal by tested label, obtain the radiofrequency signal after modulating, and the radiofrequency signal after modulation is returned to radiofrequency signal equipment, to make radiofrequency signal equipment, the radiofrequency signal after modulation is processed, obtain test data, identify tested label.
In prior art, transmitting antenna and receiving antenna work in same frequency range, and dimensional structure is identical, the coupled flutter that amplitude is larger is produced between transmitting antenna and receiving antenna, when radiofrequency signal equipment processes mixed signal, be difficult to obtain test data, cause part labels not to be identified.
Summary of the invention
The object of this invention is to provide tag test system, to identify more labels.
The invention provides a kind of tag test system, comprising:
Radiofrequency signal equipment, for generation of sending signal and processing the signal after carrier cancellation, obtains test data, to identify tested label;
Power amplifier, with described radiofrequency signal equipment connection, for processing described transmission signal, the transmission signal after being amplified;
Carrier cancellation device, be connected with described power amplifier and receiving equipment, for processing the transmission signal after described amplification, signal after being adjusted, constant amplitude and anti-phase is approximately to make the signal after adjustment and described Received signal strength, and the signal after described adjustment and described Received signal strength are carried out overlap-add procedure, obtain the signal after described carrier cancellation, signal after described carrier cancellation is sent to described radiofrequency signal equipment, transmission signal after described amplification is sent to transmitting apparatus, described Received signal strength is the signal that the described tested label of described receiving equipment acquisition returns, describedly be approximately constant amplitude and anti-phasely refer to the signal after described adjustment and the difference of described Received signal strength in amplitude and phase place respectively in the preset range of amplitude and phase place,
Described transmitting apparatus, is connected with described carrier cancellation device, for the transmission signal after described amplification is sent to described tested label;
Described receiving equipment, for obtaining described Received signal strength.
The present invention is processed according to the signal obtained through power amplifier process to received signal by carrier cancellation device, thus to counteract in Received signal strength most coupled interference between transmitting antenna and receiving antenna, be conducive to radiofrequency signal module and obtain detection data, more labels are identified.
Accompanying drawing explanation
Fig. 1 is the structural drawing of tag test system first embodiment of the present invention;
Fig. 2 is the structural drawing of tag test system second embodiment of the present invention;
Fig. 3 is the schematic diagram of tag test system of the present invention;
Fig. 4 a be the tested label signal of the present invention stronger time Received signal strength envelope diagram;
Fig. 4 b be the tested label signal of the present invention more weak time Received signal strength envelope diagram;
Fig. 4 c be the tested label signal of the present invention very weak time Received signal strength envelope diagram;
Fig. 5 a is the oscillogram of ideally Received signal strength;
Fig. 5 b is the oscillogram of the signal ideally after the adjustment of carrier cancellation device process;
Fig. 6 a be Received signal strength in Fig. 4 c with adjustment after Signal averaging after signal envelope figure;
Fig. 6 b is the envelope diagram after the signal in Fig. 6 a after superposition amplifies;
Fig. 7 is the structural drawing of tag test system of the present invention 3rd embodiment;
Fig. 8 is the structural drawing of tag test system of the present invention 4th embodiment;
Fig. 9 is the structural drawing of tag test system of the present invention 5th embodiment;
Figure 10 is the schematic diagram of existing vector modulator;
Figure 11 is the circuit diagram of tag test system control logic circuit of the present invention;
Figure 12 is the circuit diagram of tag test system attenuator of the present invention;
Figure 13 is the circuit diagram of tag test system phase shifter of the present invention 8 high speed electric current output D/A C chips;
Figure 14 is the circuit diagram of tag test system phase shifter vector modulator of the present invention;
Figure 15 is the circuit diagram of tag test system comparer of the present invention;
Figure 16 is the circuit diagram of tag test system power supply of the present invention.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the structural drawing of tag test system first embodiment of the present invention, as shown in Figure 1, comprising:
Radiofrequency signal equipment 1, for generation of sending signal and processing the signal after carrier cancellation, obtains test data, to identify tested label.
Wherein, radiofrequency signal equipment 1 specifically can also comprise: steering logic and data processing equipment, signal generator, the power amplifier of little multiple and signal analyzer.Signal generator can produce various forms of signal according to the instruction of steering logic and data processing equipment, and signal analyzer is used for carrying out the process such as detection, decoding to received signal, gives steering logic and data processing equipment processes by result.
Power amplifier 2, is connected with radiofrequency signal equipment 1, for processing transmission signal, and the transmission signal after being amplified.
Power amplifier 2 is different from the enlargement factor of the power amplifier of above-mentioned little multiple.The power amplifier of little multiple is that radiofrequency signal equipment carries, its enlargement factor can not meet the transmission requirement of transmitting antenna, transmission signal after low power power amplifier amplifies, then through the process of power amplifier 2, the transmission requirement of transmitting antenna could be met.
Carrier cancellation device 3, be connected with power amplifier 2 and receiving equipment 5, for processing the transmission signal after amplification, signal after being adjusted, constant amplitude and anti-phase is approximately to make the signal after adjustment and Received signal strength, and the signal after adjustment and Received signal strength are carried out overlap-add procedure, obtain the signal after carrier cancellation, signal after carrier cancellation is sent to radiofrequency signal equipment 1, transmission signal after amplifying is sent to transmitting apparatus, Received signal strength is the signal that the tested label of receiving equipment acquisition returns, be approximately constant amplitude and anti-phasely refer to the signal after adjustment and the difference of Received signal strength in amplitude and phase place respectively in the preset range of amplitude and phase place.
A large amount of undesired signals is comprised in Received signal strength, undesired signal is mainly the coupled flutter between transmitting antenna and receiving antenna, carrier cancellation device 3 is for offsetting coupled flutter, obtain the signal after carrier cancellation, process with the signal after making radiofrequency signal equipment 1 pair of carrier cancellation.
Transmitting apparatus 4, is connected with carrier cancellation device 3, for the transmission signal after amplification is sent to tested label.
Receiving equipment 5, for obtaining Received signal strength.
The present embodiment offsets the most of coupled flutter in Received signal strength by carrier cancellation device, obtains the signal after carrier cancellation, is conducive to radiofrequency signal equipment and processes the signal after carrier cancellation, identify more tested label.
Fig. 2 is the structural drawing of tag test system second embodiment of the present invention, and as shown in Figure 2, on the basis of the first embodiment, transmitting apparatus 4 comprises:
Send cable 41, be connected with carrier cancellation device 3 and transmitting antenna 42, for by amplify after transmission Signal transmissions to transmitting antenna 42.
Transmitting antenna 42, for sending to tested label by the transmission signal after amplification.
On the basis of the first embodiment, receiving equipment 5 comprises:
Receiving antenna 52, for obtaining Received signal strength.
Receive cable 51, be connected with receiving antenna 52 and carrier cancellation device 3, for Received signal strength is transferred to carrier cancellation device.
On the basis of the first embodiment, carrier cancellation device 3 comprises:
First directional coupler 31, be connected by power amplifier 2 with radiofrequency signal equipment 1, for being divided into by the transmission signal after amplification first after amplification to send signal and the second transmission signal after amplifying, the first transmission signal after amplification is used for sending to tested label by transmitting antenna.
Adjusting module 32, with the first directional coupler 31 with receive cable 51 and be connected, signal is sent for adjusting second after amplification, make the signal after adjusting and Received signal strength be approximately constant amplitude and anti-phase, be approximately constant amplitude and anti-phasely refer to the signal after adjustment and the difference of Received signal strength in amplitude and phase place respectively in the preset range of amplitude and phase place.
Totalizer 33, with adjusting module 32 with receives cable 51 and be connected, for carrying out overlap-add procedure to the signal after adjusting and Received signal strength, obtain the signal after superposing, send to radiofrequency signal equipment 1, to make radiofrequency signal equipment 1 process the signal after superposition, identify tested label.
The specific works process of tag test system second embodiment is below provided.
Radiofrequency signal equipment 1 produces and sends signal, and transmission signal is sent to power amplifier 2, power amplifier 2 carries out amplification process to transmission signal, and the transmission signal after amplification is sent to the first directional coupler 31 in carrier cancellation device 3 by the transmission signal after being amplified, first directional coupler 31 is divided into by the transmission signal after amplification first after amplification to send signal and second after amplifying sends signal, the first transmission signal after amplifying is sent to tested label by transmitting antenna 42, the second transmission signal after amplifying is sent to adjusting module 32, adjusting module 32 sends signal to second after amplification and processes, and the signal after being adjusted, sends to totalizer 33, the Received signal strength of totalizer 33 to the signal after adjustment and receiving antenna 52 carries out overlap-add procedure, obtain the signal after carrier cancellation, carrier cancellation device 3 is connected with receiving antenna 52 by receiving cable 51, signal after amplifying is sent to transmitting antenna 42 by sending cable 41, carrier cancellation device 3 can also receive the Received signal strength that receiving antenna 52 sends by receiving cable 51, and process to received signal according to the signal after amplifying, obtain the signal after carrier cancellation, signal after carrier cancellation is sent to radiofrequency signal equipment 1, signal after radiofrequency signal equipment 1 pair of carrier cancellation processes, obtain the test data of tested label, identify tested label, as shown in Figure 3, Fig. 3 is the schematic diagram of tag test system of the present invention.
Be illustrated with signal graph below.Fig. 4 a be tested label signal stronger time Received signal strength envelope diagram, Fig. 4 b be tested label signal more weak time Received signal strength envelope diagram, Fig. 4 c be tested label signal very weak time Received signal strength envelope diagram, wherein, Received signal strength is the reflected signal of tested label and the superposition of antenna-coupled carrier wave.From Fig. 4 a, Fig. 4 b and Fig. 4 c, when tested label signal is very weak Received signal strength envelope diagram in label signal envelope changes in amplitude very little, cause tested label to be not easy to be identified or can not to be identified.
Fig. 5 a is the oscillogram of ideally Received signal strength, Fig. 5 b is the oscillogram of the signal ideally after the adjustment that carrier cancellation device 1 processes, from Fig. 5 a and Fig. 5 b, ideally adjustment after signal and Received signal strength constant amplitude in amplitude and phase place anti-phase, signal ideally after adjustment superposes with Received signal strength, can offset completely, in the present embodiment, it is anti-phase that signal after adjustment and Received signal strength are approximately constant amplitude in amplitude and phase place, can not offset completely after superposition.
Fig. 6 a be Received signal strength in Fig. 4 c with adjustment after Signal averaging after signal envelope figure, Fig. 6 b is the envelope diagram after the signal in Fig. 6 a after superposition amplifies.From Fig. 6 a and Fig. 6 b, radiofrequency signal equipment 1 processes the signal after superposition, processes to received signal, more easily obtains test data, identify tested label relative to radiofrequency signal equipment 1.
The present embodiment is processed transmission signal by adjusting module, signal after being adjusted, constant amplitude and anti-phase is being approximately to make the signal after adjustment and Received signal strength, signal after adjustment and Received signal strength are carried out overlap-add procedure by totalizer, offset most of coupled flutter of transmitting antenna and receiving antenna in Received signal strength, to make radiofrequency signal equipment process the signal after superposition, identify tested label better.
Fig. 7 is the structural drawing of tag test system of the present invention 3rd embodiment, and as shown in Figure 7, on the basis of the second embodiment, adjusting module 32 comprises:
Attenuator 321, is connected with the first directional coupler 31, carrying out amplitude fading, obtaining the signal after decaying for sending signal to second after amplification.
Phase shifter 322, is connected with attenuator 321, for carrying out phase shift process to the signal after decay, obtains the signal after phase shift process.
Adjuster 323, with phase shifter 322 with receives cable 51 and be connected, for according to the signal after phase shift process and Received signal strength, generation amplitude adjusted signal and phase adjustment signal, and input to attenuator 321 and phase shifter 322 respectively, attenuator 321 and phase shifter 322 are adjusted.The specific works process of adjusting module 32 in tag test system the 3rd embodiment is below provided.
After attenuator 321 receives the amplification of the first directional coupler 31 transmission second sends signal, carries out amplitude fading, obtain the signal after decaying, the signal after decaying is sent to phase shifter 322 the second transmission signal after amplifying; Phase shifter 322 carries out phase shift process to the signal after decay, obtains the signal after phase shift process, sends to adjuster 323; The Received signal strength of the signal after phase shift process and receiving antenna analyzed by adjuster 323, obtains amplitude adjusted signal and phase adjustment signal, and inputs to attenuator 321 and phase shifter 322 respectively, adjusts attenuator 321 and phase shifter 322.
In the present embodiment, the frequency of operation sending signal can be 300MHz-6GHz, when the frequency of operation sending signal changes, the range value of Received signal strength and phase value correspondingly also can change, adjuster adjusts according to the phase shift value of Received signal strength to the amplitude attenuation value of attenuator and phase shifter after change, thus achieves self-adaptative adjustment.
Fig. 8 is the structural drawing of carrier cancellation device the 4th embodiment, and as shown in Figure 8, on the basis of the 3rd embodiment, adjuster 323 comprises:
Second directional coupler 3231, is connected with phase shifter 322, for the signal after phase shift process being divided into the signal after the signal after the first phase shift process and the second phase shift process.
3rd directional coupler 3232, is connected, for Received signal strength being divided into the first Received signal strength and the second Received signal strength with reception cable 51.
Adjustment unit 3233,3232 are connected with the second directional coupler 3231 and the 3rd directional coupler, for according to the signal after the first phase shift and the first Received signal strength, produce amplitude adjusted signal and phase adjustment signal, and input to attenuator 321 and phase shifter 322 respectively, attenuator 321 and phase shifter 322 are adjusted.
Totalizer 33 is specifically connected with the second directional coupler 3231 and the 3rd directional coupler 3232, for carrying out overlap-add procedure to the signal after the second phase shift process and the second Received signal strength.
The specific works process of adjuster 323 in tag test system the 4th embodiment is below provided.
Second directional coupler 3231 receives the signal after the phase shift process of phase shifter 322 transmission, signal after phase shift process is divided into the signal after the signal after the first phase shift process and the second phase shift process, signal after first phase shift process is sent to adjustment unit 3233, Received signal strength is divided into the first Received signal strength and the second Received signal strength by the 3rd directional coupler 3232, first Received signal strength is sent to adjustment unit 2233, adjustment unit 3233 analyzes the signal after the first phase shift process and the first Received signal strength, obtain amplitude adjusted signal and phase adjustment signal, amplitude adjusted signal is sent to attenuator 321, phase adjustment signal is sent to phase shifter 322, attenuator 321 and phase shifter 322 are adjusted.
Fig. 9 is the structural drawing of carrier cancellation device the 5th embodiment, and as shown in Figure 9, on the basis of the 4th embodiment, adjustment unit 3233 comprises:
Comparer 32331, is connected with the second directional coupler 3231 and the 3rd directional coupler 3232, for according to the signal after the first phase shift and the first Received signal strength, produces amplitude comparison signal and comparison of signal phase.
Control logic circuit 32332, is connected with comparer 32331, for according to amplitude comparison signal and comparison of signal phase, produces amplitude adjusted signal and phase adjustment signal, adjusts attenuator 321 and phase shifter 322.
Attenuator 321 is specially 5 numerical-control attenuators, and phase shifter 322 is specially digital phase shifter.
The specific works process of adjustment unit 3233 in carrier cancellation device the 5th embodiment is below provided.
The first Received signal strength that signal after comparer 32331 receives the first phase shift of the second directional coupler 3231 transmission and the 3rd directional coupler 3232 send, analyze the signal after the first phase shift and the first Received signal strength, obtain amplitude comparison signal and comparison of signal phase, amplitude comparison signal and comparison of signal phase are sent to control logic circuit 32332, control logic circuit 32332 is according to amplitude comparison signal and comparison of signal phase, produce amplitude adjusted signal and phase adjustment signal, attenuator 321 and phase shifter 322 are adjusted, thus realize the self-adaptative adjustment of attenuator 321 and phase shifter 322.
Phase shifter 322 comprises: high-speed digital-analog conversion DAC3221, is connected with control logic circuit 32332, and for carrying out digital-to-analog conversion to phase adjustment signal, obtain the phase adjustment signal after changing, the phase adjustment signal after changing is simulating signal.
Vector modulator 3222, changes DAC3221 with high-speed digital-analog and is connected, for carrying out phase shift process according to the phase adjustment signal after conversion to the signal after decay.
Wherein, as shown in Figure 10, the phase adjustment signal after conversion can be two-way base band DC voltage V to the schematic diagram of vector modulator 3222
bBIand V
bBQ, the phase shift value of phase shifter can be obtained according to following formulae discovery:
Phase＝arctan(V
BBQ/V
BBI)
The function of phase shift θ just can be realized by following formula phase shifter:
cos(wt+θ)＝cos wt*cosθ-sin wt*sinθ
The specific works process of tag test system is below provided.
First directional coupler 31 receives the transmission signal after amplifying, first directional coupler 31 is divided into by the transmission signal after amplification first after amplification to send signal and second after amplifying sends signal, the first transmission signal after amplifying is sent to tested label by transmitting antenna 42, the second transmission signal after amplifying is sent to attenuator 321, after attenuator 321 receives the amplification of the first directional coupler 31 transmission second sends signal, carries out amplitude fading, obtain the signal after decaying, the signal after decaying is sent to phase shifter 322 the second transmission signal after amplifying, phase shifter 322 carries out phase shift process to the signal after decay, obtains the signal after phase shift process, sends to the second directional coupler 3231, second directional coupler 3231 receives the signal after the phase shift process of phase shifter 322 transmission, signal after phase shift process is divided into the signal after the signal after the first phase shift process and the second phase shift process, signal after first phase shift process is sent to comparer 32331, the signal after the second phase shift process is sent to totalizer 33, Received signal strength is divided into the first Received signal strength and the second Received signal strength by the 3rd directional coupler 3232, and the first Received signal strength is sent to comparer 32331, and the second Received signal strength is sent to totalizer 33, the first Received signal strength that signal after comparer 32331 receives the first phase shift of the second directional coupler 3231 transmission and the 3rd directional coupler 3232 send, analyze the signal after the first phase shift and the first Received signal strength, obtain amplitude comparison signal and comparison of signal phase, amplitude comparison signal and comparison of signal phase are sent to control logic circuit 32332, control logic circuit 32332 is according to amplitude comparison signal and comparison of signal phase, produce amplitude adjusted signal and phase adjustment signal, amplitude adjusted signal is sent to attenuator 321, phase adjustment signal is sent to phase shifter 322, attenuator 321 is according to amplitude adjusted signal adjusting range attenuation multiple, phase shifter 322 according to phase adjustment signal adjustment phase shift angle, thus realizes the self-adaptative adjustment function of attenuator 321 and phase shifter 322.
Wherein, control logic circuit 32332 is that core is to realize logic control function with microcontroller.The microcontroller adopted in the present embodiment is Atmega16 single-chip microcomputer, the amplitude comparison signal utilizing the analog to digital conversion circuit of Atmega16 single-chip microcomputer to export comparer 32331 and comparison of signal phase carry out analog to digital conversion, obtain digital signal, the processor of Atmega16 single-chip microcomputer is utilized to process digital signal, obtain amplitude adjusted signal and phase adjustment signal, export to attenuator 321 and phase shifter 322 respectively, physical circuit as shown in figure 11.
Attenuator 321 is numerical-control attenuator.Adopt five-digit number controlling attenuation device in the present embodiment, the minimal attenuation value of five-digit number controlling attenuation device is 0.5dB, and maximum attenuation value is 15.5dB, and the amplitude adjusted signal exported by control logic circuit 32332 carrys out adjusting range pad value, and physical circuit as shown in figure 12.
Adopt high-speed digital-analog conversion DAC3221 and vector modulator 3222 to realize phase shift function in the present embodiment.High-speed digital-analog conversion DAC3221 adopts high speed electric current output D/A C chip to coordinate resistor network, provides two-way high precision, stable baseband voltage to vector modulator.High speed electric current output D/A C chip can be 8 DAC, also can be 10 DAC.When high speed electric current output D/A C chip be 8 DAC realize the phase shift within the scope of 360 degree time, phase shifting accuracy is approximately 360 degree/256=1.4 degree; When high speed electric current output D/A C chip be 10 DAC realize the phase shift within the scope of 360 degree time, phase shifting accuracy is approximately 360 degree/1024=0.35 degree, adopt 8 DAC to provide two-way high precision, stable baseband voltage in the present embodiment, physical circuit as shown in figure 13.
Vector modulator 3222 realizes phase shift function according to two-way baseband voltage, and physical circuit as shown in figure 14.
The physical circuit of the comparer 32331 in the present embodiment as shown in figure 15.
Power acquisition in the present embodiment 5V direct supply, 7.5V linear power supply is converted to by linear voltage regulator by 5V direct supply, and physical circuit as shown in figure 16.
Further, comparer 32331 can be replaced with the first comparer and the second comparer, and the first comparer is connected with the second directional coupler 3231 and the 3rd directional coupler 3232, for according to the signal after the first phase shift and the first Received signal strength, produce amplitude comparison signal; Second comparer, is connected with the second directional coupler 3231 and the 3rd directional coupler 3232, for according to the signal after the first phase shift and the first Received signal strength, produces comparison of signal phase.
Further, control logic circuit 32332 can be replaced with the first amplifier and the second amplifier, and the first amplifier, is connected with comparer 32331, for processing amplitude comparison signal, obtains amplitude adjusted signal; Second amplifier, is connected with comparer 32331, for processing comparison of signal phase, obtains phase adjustment signal, and in this case, attenuator 321 is voltage controlled attenuator, and phase shifter 322 is vector modulator.
In addition, also the comparer 32331 be connected with the first amplifier can be replaced to the first comparer, the comparer 32331 be connected with the second amplifier is replaced to the second comparer.
Further, a wave detector can also be added between totalizer 33 and control logic circuit 32332, power, for the power of signal after the superposition that detects totalizer and export, represents with the form of DC voltage, and periodically the value of DC voltage is stored by wave detector.It is anti-phase that signal after the phase place adjustment that attenuator and phase shifter obtain and Received signal strength are approximately constant amplitude, and the signal after phase place adjustment and the difference existed between Received signal strength in amplitude and phase place, main cause is that the precision of comparer is not high.In the minimum precision of comparer such as in the minimum precision (-5 of phase place, + 5) the value comparer in is difficult to identify, according to phase place adjustment after signal and Received signal strength be constant amplitude anti-phase time, the power of the signal after superposition is minimum, wave detector can periodically in phase place (-5, + 5) extract 11 points or more in, the size recording the output terminal performance number of each point compares, and the phase point corresponding to power minimum is inverted phases point.The accuracy of identification of comparer is improved by wave detector, reduce the difference of phase place between the signal after phase place adjustment and Received signal strength, wave detector also may be used for the difference of amplitude between the signal after reducing phase place adjustment and Received signal strength simultaneously, offset the coupled interference between more transmitting antenna and receiving antenna, more be conducive to radiofrequency signal module and obtain detection data, more labels are identified.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a tag test system, is characterized in that, comprising:
Radiofrequency signal equipment, for generation of sending signal and processing the signal after carrier cancellation, obtains test data, to identify tested label;
Power amplifier, with described radiofrequency signal equipment connection, for processing described transmission signal, the transmission signal after being amplified;
Carrier cancellation device, be connected with described power amplifier and receiving equipment, for processing the transmission signal after described amplification, signal after being adjusted, constant amplitude and anti-phase is approximately to make the signal after adjustment and Received signal strength, and the signal after described adjustment and described Received signal strength are carried out overlap-add procedure, obtain the signal after described carrier cancellation, signal after described carrier cancellation is sent to described radiofrequency signal equipment, transmission signal after described amplification is sent to transmitting apparatus, described Received signal strength is the signal that the described tested label of described receiving equipment acquisition returns, describedly be approximately constant amplitude and anti-phasely refer to the signal after described adjustment and the difference of described Received signal strength in amplitude and phase place respectively in the preset range of amplitude and phase place,
Described transmitting apparatus, is connected with described carrier cancellation device, for the transmission signal after described amplification is sent to described tested label;
Described receiving equipment, for obtaining described Received signal strength;
Described carrier cancellation device, comprising:
First directional coupler, be connected with described power amplifier, for being divided into by the transmission signal after described amplification first after amplification to send signal and the second transmission signal after amplifying, first after described amplification sends signal and is used for sending to described tested label by transmitting antenna;
Adjusting module, with described first directional coupler with receives cable and be connected, for adjusting the second transmission signal after described amplification, obtains the signal after described adjustment;
Totalizer, is connected with described adjusting module and described reception cable, for carrying out overlap-add procedure to the signal after described adjustment and described Received signal strength, obtains the signal after described carrier cancellation, sends to described radiofrequency signal equipment;
Described adjusting module comprises:
Attenuator, is connected with described first directional coupler, carrying out amplitude fading, obtaining the signal after decaying for sending signal to second after described amplification;
Phase shifter, is connected with described attenuator, for carrying out phase shift process to the signal after described decay, obtains the signal after phase shift process;
Adjuster, be connected with described phase shifter and described reception cable, for according to the signal after described phase shift process and described Received signal strength, produce amplitude adjusted signal and phase adjustment signal, and input to described attenuator and described phase shifter respectively, described attenuator and described phase shifter are adjusted;
Described adjuster comprises:
Second directional coupler, is connected with described phase shifter, for the signal after described phase shift process being divided into the signal after the signal after the first phase shift process and the second phase shift process;
3rd directional coupler, is connected with described reception cable, for described Received signal strength is divided into the first Received signal strength and the second Received signal strength;
Adjustment unit, be connected with described second directional coupler and described 3rd directional coupler, for according to the signal after described first phase shift and described first Received signal strength, produce described amplitude adjusted signal and described phase adjustment signal, and input to described attenuator and described phase shifter respectively, described attenuator and described phase shifter are adjusted;
Described totalizer is specifically connected with described second directional coupler and described 3rd directional coupler, for carrying out overlap-add procedure to the signal after described second phase shift process and described second Received signal strength.
2. system according to claim 1, is characterized in that, described transmitting apparatus comprises:
Send cable, be connected with described carrier cancellation device and described transmitting antenna, for by the transmission Signal transmissions after described amplification to described transmitting antenna;
Described transmitting antenna, for sending to described tested label by the transmission signal after described amplification.
3. system according to claim 1 and 2, is characterized in that, described receiving equipment comprises:
Receiving antenna, for obtaining described Received signal strength;
Described reception cable, is connected with described receiving antenna and described carrier cancellation device, for described Received signal strength is transferred to described carrier cancellation device.
4. system according to claim 3, is characterized in that, described adjustment unit comprises:
Comparer, is connected with described second directional coupler and described 3rd directional coupler, for according to the signal after described first phase shift and described first Received signal strength, produces amplitude comparison signal and comparison of signal phase.
5. system according to claim 3, is characterized in that, described adjustment unit comprises:
First comparer, is connected with described second directional coupler and described 3rd directional coupler, for according to the signal after described first phase shift and described first Received signal strength, produces amplitude comparison signal;
Second comparer, is connected with described second directional coupler and described 3rd directional coupler, for according to the signal after described first phase shift and described first Received signal strength, produces comparison of signal phase.
6. system according to claim 4, is characterized in that, described adjustment unit also comprises:
Control logic circuit, is connected with described comparer, for according to described amplitude comparison signal and described comparison of signal phase, produces described amplitude adjusted signal and described phase adjustment signal, adjusts described attenuator and described phase shifter;
Described attenuator is specially 5 numerical-control attenuators, and described phase shifter is specially digital phase shifter.
7. system according to claim 4, is characterized in that, described adjustment unit also comprises:
First amplifier, is connected with described comparer, for processing described amplitude comparison signal, obtains described amplitude adjusted signal;
Second amplifier, is connected with described comparer, for processing described comparison of signal phase, obtains described phase adjustment signal;
Described attenuator is specially voltage controlled attenuator, and described phase shifter is specially vector modulator, for carrying out phase shift process according to described phase adjustment signal to the signal after described decay.
8. system according to claim 5, is characterized in that, described adjustment unit also comprises:
First amplifier, is connected with described first comparer, for processing described amplitude comparison signal, obtains described amplitude adjusted signal;
Second amplifier, is connected with described second comparer, for processing described comparison of signal phase, obtains described phase adjustment signal;
Described attenuator is specially voltage controlled attenuator, and described phase shifter is specially vector modulator, for carrying out phase shift process according to described phase adjustment signal to the signal after described decay.
9. system according to claim 6, is characterized in that, described digital phase shifter comprises:
High-speed digital-analog conversion DAC, is connected with described control logic circuit, for carrying out digital-to-analog conversion to described amplitude adjusted signal and described phase adjustment signal, obtains the phase adjustment signal after the amplitude adjusted signal after changing and conversion;
Vector modulator, changes DAC with described high-speed digital-analog and is connected, for carrying out phase shift process according to the phase adjustment signal after the amplitude adjusted signal after described conversion and described conversion to the signal after described decay.
10. system according to claim 1 and 2, is characterized in that, the frequency range of described transmission signal is 300MHz-6GHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210379574.5A CN102982297B (en) | 2012-09-29 | 2012-09-29 | Label test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210379574.5A CN102982297B (en) | 2012-09-29 | 2012-09-29 | Label test system |
Publications (2)
| Publication Number | Publication Date |
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| CN102982297A CN102982297A (en) | 2013-03-20 |
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| CN101517908A (en) * | 2006-09-29 | 2009-08-26 | 传感电子公司 | Radio frequency identification reader having a signal canceller and method thereof |
| CN101951241A (en) * | 2010-09-15 | 2011-01-19 | 中兴通讯股份有限公司 | Device and method for realizing radio frequency RF leakage compensation and radio frequency identification RFID reader |
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| CN101517908A (en) * | 2006-09-29 | 2009-08-26 | 传感电子公司 | Radio frequency identification reader having a signal canceller and method thereof |
| CN101951241A (en) * | 2010-09-15 | 2011-01-19 | 中兴通讯股份有限公司 | Device and method for realizing radio frequency RF leakage compensation and radio frequency identification RFID reader |
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