CN103235925A - RFID (radio frequency identification device) signal detection device and detection method thereof - Google Patents
RFID (radio frequency identification device) signal detection device and detection method thereof Download PDFInfo
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- CN103235925A CN103235925A CN2013101584000A CN201310158400A CN103235925A CN 103235925 A CN103235925 A CN 103235925A CN 2013101584000 A CN2013101584000 A CN 2013101584000A CN 201310158400 A CN201310158400 A CN 201310158400A CN 103235925 A CN103235925 A CN 103235925A
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Abstract
The invention relates to an RFID (radio frequency identification device) signal detection device and a detection method thereof. The RFID signal detection device comprises a current voltage converting unit, a filtering unit, a lock phase wave detection unit and a processing unit, wherein the current voltage converting unit is used for converting current signals on an antenna into corresponding voltage signals; the filtering unit is used for filtering voltage signals output by the current voltage converting unit, and extracting radio frequency tag flyback signals; the lock phase wave detection unit is used for converting signals output by the filtering unit into corresponding periodic function signals of which amplitude values are related to the radio frequency tag according to reference signals; and the processing unit is used for processing signals output by the lock phase wave detection unit, so as to obtain information related to the radio frequency tag.
Description
Technical field
The present invention relates to a kind of RFID signal supervisory instrument and detection method thereof.
Background technology
Now, passive RFID (identification of radio frequency bodily movement of practising Wushu) is widely used in various industries.But because the signal of passive RFID tags is comparatively faint, it is much smaller than active RFID tag that it detects distance, like this, restricted its utilization field greatly.
But, in a lot of occasions, consider for safety, environmental protection etc. are many-sided, can not use active RFID tag, for example in pipelines such as petroleum gas.
Summary of the invention
Technical matters to be solved by this invention is, a kind of RFID signal supervisory instrument and detection method thereof are provided, and can greatly promote the detectability to passive RFID tags, and certain technical scheme of the present invention also can apply to the active RFID field.
The present invention at first provides a kind of RFID signal supervisory instrument, comprising:
The current/voltage converting unit is used for the current signal on the antenna is converted into corresponding voltage signal;
Filter unit is used for the voltage signal of described current/voltage converting unit output is carried out the filtering processing, extracts the anti-energizing signal of radio-frequency (RF) tag;
Phase-locked detection unit is used for according to the periodic function signal that signal be converted to accordingly, its amplitude with this radio-frequency (RF) tag relevant of reference signal with described filter unit output; And,
Processing unit is used for the signal of described phase-locked detection unit output is handled, and obtains the relevant information with this radio-frequency (RF) tag.
Accordingly, the present invention also provides a kind of detection method that adopts described RFID signal supervisory instrument, comprises the steps:
The current/voltage switch process is converted into corresponding voltage signal to the current signal on the antenna;
Filter step, the voltage signal that described current/voltage converting unit is exported carries out the filtering processing, extracts the anti-energizing signal of radio-frequency (RF) tag;
Phase-locked detection step is according to the periodic function signal that signal be converted to accordingly, its amplitude with this radio-frequency (RF) tag relevant of reference signal with described filter unit output; And,
Treatment step is handled the signal of described phase-locked detection unit output, and obtains the relevant information with this radio-frequency (RF) tag.
Preferably, described processing unit comprises:
Integration module is used for the signal of described phase-locked detection unit output is carried out Integral Processing;
Amplification module is used for the signal of described integration module output is amplified processing; And,
Computing module is used for the signal of described amplification module output is carried out analog to digital conversion and carries out computing, with the relevant information of acquisition with this radio-frequency (RF) tag.
Preferably, described phase-locked detection unit comprises:
The reference frequency module is for generation of the periodic frequency signal; And,
The multiplication process module is used for the signal of described reference frequency module output and the signal of described filter unit output are carried out multiplying, to produce the periodic function signal of exporting with described filter unit that signal is corresponding, its amplitude is relevant with this radio-frequency (RF) tag.
Preferably, described filter unit adopts switch filter.
Compared with prior art, the invention has the advantages that: can greatly promote the detectability to passive RFID tags, can effectively realize the passive RFID tags of longer distance is found range and located, certain technical scheme of the present invention also can apply to the active RFID field.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of RFID signal supervisory instrument of the present invention;
Fig. 2 is further concrete structural representation of a middle part embodiment illustrated in fig. 1;
Fig. 3 is further concrete structural representation of a middle part embodiment illustrated in fig. 1;
Fig. 4 is the synoptic diagram of middle current/voltage converting unit output electric signal embodiment illustrated in fig. 1;
Fig. 5 is the structural representation of a kind of embodiment of detection method of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are described further.
As shown in Figure 1, a kind of RFID signal supervisory instrument comprises:
The current/voltage converting unit is used for the current signal on the antenna is converted into corresponding voltage signal;
Filter unit is used for the voltage signal of described current/voltage converting unit output is carried out the filtering processing, extracts the anti-energizing signal of radio-frequency (RF) tag;
Phase-locked detection unit is used for according to the periodic function signal that signal be converted to accordingly, its amplitude with this radio-frequency (RF) tag relevant of reference signal with described filter unit output; And,
Processing unit is used for the signal of described phase-locked detection unit output is handled, and obtains the relevant information with this radio-frequency (RF) tag.
In conjunction with shown in Figure 4, in above-described embodiment, on the antenna of RFID signal supervisory instrument, be distributed with following current signal chronologically:
1, the field signal of antenna generation: that antenna produces, as to be used for excitation passive RFID tags signal, the intensity maximum of its signal;
2, discharge sudden change: the jump signal that antenna produces when discharging electric charge;
3, antenna is by the anti-energizing signal in label magnetic field: the RFID label is swashed the signal that resonance produces by anti-, be extremely faint oscillator signal, and when not having the RFID label, this part signal then is direct current.
More than three kinds of signals be arranged in order chronologically, non-overlapping copies moves in circles.Wherein, the RFID label is the faintest by the signal that anti-sharp resonance produces, and is far smaller than other two signals.As not adding separation, then can't effectively be handled by the anti-signal that swashs the resonance generation the RFID label at all.
Voltage signal is input to filter unit, and filter unit is according to sequential, and above-mentioned the 1st kind and the 2nd kind of signal are carried out filtering, and its signal location is replaced with the 0v signal.Macroscopic view upward can be regarded as by the time domain tiling after the filtering only has the RFID label instead to be swashed the signal that resonates and produce, and this signal is very faint certainly.
Wherein, described filter unit adopts switch filter.
The output antenna of described filter unit instead swashs resonance signal to phase-locked inspection unit.
As shown in Figure 2, described phase-locked detection unit comprises:
The reference frequency module is for generation of the periodic frequency signal; And,
The multiplication process module is used for the signal of described reference frequency module output and the signal of described filter unit output are carried out multiplying, to produce the periodic function signal of exporting with described filter unit that signal is corresponding, its amplitude is relevant with this radio-frequency (RF) tag.
Described reference frequency module is exported reference signal chronologically to the multiplication process module, and reference signal and anti-sharp resonance voltage signal homophase or anti-phase are with a fixed frequency conversion.Two signals are done digital multiplying, produce the periodic function signal of exporting with described filter unit that signal is corresponding, its amplitude is relevant with this radio-frequency (RF) tag, so that subsequent processes.
As shown in Figure 3, described processing unit comprises:
Integration module is used for the signal of described phase-locked detection unit output is carried out Integral Processing;
Amplification module is used for the signal of described integration module output is amplified processing; And,
Computing module is used for the signal of described amplification module output is carried out analog to digital conversion and carries out computing, with the relevant information of acquisition with this radio-frequency (RF) tag.
Sinusoidal wave amplitude has comprised the position relation of handset antenna and label after the amplification that processing unit is measured, and can parse through certain algorithm.So can locate and find range.
Wherein, described phase-locked detection unit institute is to described processing unit output multiplication result.Multiplying signal comprises useful signal and invalid signals.Described integration module can be 0 with the invalid signals integration, and useful signal is integrated and is the sine wave consistent with the reference signal reversal frequency, and its crest value instead swashs the resonance voltage signal amplitude with antenna and is directly proportional, and certain multiple relation is arranged.Sine wave signal through amplifying directly outputs to the analog-to-digital conversion module and is converted into corresponding digital signal, handles with computing module.Certainly, computing module can also be adjusted to the carrying out in the amplification module by the output range conditioning signal accordingly, controls range in real time and prevents from amplifying saturated, enlarges measurement range.
As shown in Figure 5, in conjunction with Fig. 1,2 and 3, a kind of embodiment of detection method comprises the process of following round circulation.
1) beginning step;
2) current/voltage switch process is converted into corresponding voltage signal to the current signal on the antenna;
3) filter step adopts switch filter that the voltage signal of described current/voltage converting unit output is carried out the filtering processing, extracts the anti-energizing signal of radio-frequency (RF) tag;
4) phase-locked detection step is according to the periodic function signal that signal be converted to accordingly, its amplitude with this radio-frequency (RF) tag relevant of reference signal with described filter unit output;
5) integral transformation step, the signal that described phase-locked detection unit is exported carries out Integral Processing;
6) frequency-selecting amplification procedure, the signal that described integration module is exported amplifies processing.
Then, carry out computing to amplify handling the signal that obtains, will be to obtain the relevant information with this radio-frequency (RF) tag, can effectively realize the passive RFID tags of longer distance is found range and located.
Above content is in conjunction with specific embodiments to further describing that the present invention does, and can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (5)
1. a RFID signal supervisory instrument is characterized in that, comprising:
The current/voltage converting unit is used for the current signal on the antenna is converted into corresponding voltage signal;
Filter unit is used for the voltage signal of described current/voltage converting unit output is carried out the filtering processing, extracts the anti-energizing signal of radio-frequency (RF) tag;
Phase-locked detection unit is used for according to the periodic function signal that signal be converted to accordingly, its amplitude with this radio-frequency (RF) tag relevant of reference signal with described filter unit output; And,
Processing unit is used for the signal of described phase-locked detection unit output is handled, and obtains the relevant information with this radio-frequency (RF) tag.
2. RFID signal supervisory instrument as claimed in claim 1 is characterized in that, described processing unit comprises:
Integration module is used for the signal of described phase-locked detection unit output is carried out Integral Processing;
Amplification module is used for the signal of described integration module output is amplified processing; And,
Computing module is used for the signal of described amplification module output is carried out analog to digital conversion and carries out computing, with the relevant information of acquisition with this radio-frequency (RF) tag.
3. RFID signal supervisory instrument as claimed in claim 1 or 2 is characterized in that, described phase-locked detection unit comprises:
The reference frequency module is for generation of the periodic frequency signal; And,
The multiplication process module is used for the signal of described reference frequency module output and the signal of described filter unit output are carried out multiplying, to produce the periodic function signal of exporting with described filter unit that signal is corresponding, its amplitude is relevant with this radio-frequency (RF) tag.
4. RFID signal supervisory instrument as claimed in claim 3 is characterized in that, described filter unit adopts switch filter.
5. one kind is adopted the detection method of RFID signal supervisory instrument according to claim 1, it is characterized in that, comprises the steps:
The current/voltage switch process is converted into corresponding voltage signal to the current signal on the antenna;
Filter step, the voltage signal that described current/voltage converting unit is exported carries out the filtering processing, extracts the anti-energizing signal of radio-frequency (RF) tag;
Phase-locked detection step is according to the periodic function signal that signal be converted to accordingly, its amplitude with this radio-frequency (RF) tag relevant of reference signal with described filter unit output; And,
Treatment step is handled the signal of described phase-locked detection unit output, and obtains the relevant information with this radio-frequency (RF) tag.
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Citations (5)
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|---|---|---|---|---|
| US20060238301A1 (en) * | 2005-02-22 | 2006-10-26 | Jiangfeng Wu | Multi-protocol radio frequency identification transponder tranceiver |
| US20080153439A1 (en) * | 2006-12-20 | 2008-06-26 | Broadcom Corporation, A California Corporation | Apparatus and method to adjust and filter current DAC signals |
| CN102184431A (en) * | 2011-04-27 | 2011-09-14 | 深圳市远望谷信息技术股份有限公司 | Method and device for removing self-interference from passive radio frequency identification reader-writer |
| CN103034827A (en) * | 2012-12-10 | 2013-04-10 | 肖蕾 | Radio frequency tag detecting device and detecting method thereof |
| CN203366366U (en) * | 2013-04-28 | 2013-12-25 | 肖蕾 | RFID signal detection apparatus |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060238301A1 (en) * | 2005-02-22 | 2006-10-26 | Jiangfeng Wu | Multi-protocol radio frequency identification transponder tranceiver |
| US20080153439A1 (en) * | 2006-12-20 | 2008-06-26 | Broadcom Corporation, A California Corporation | Apparatus and method to adjust and filter current DAC signals |
| CN102184431A (en) * | 2011-04-27 | 2011-09-14 | 深圳市远望谷信息技术股份有限公司 | Method and device for removing self-interference from passive radio frequency identification reader-writer |
| CN103034827A (en) * | 2012-12-10 | 2013-04-10 | 肖蕾 | Radio frequency tag detecting device and detecting method thereof |
| CN203366366U (en) * | 2013-04-28 | 2013-12-25 | 肖蕾 | RFID signal detection apparatus |
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Effective date of registration: 20180530 Address after: 311106 No. 268 Tangkang Road, Tangqi Town, Yuhang District, Hangzhou, Zhejiang. Patentee after: Hangzhou Dehao Huanbao Cailiao Co., Ltd. Address before: 310019 1093 building, 1 building, 24 9, nine Sheng Road, Jianggan District, Hangzhou, Zhejiang. Patentee before: Hangzhou Hangrun Technology Co., Ltd. |
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Effective date of registration: 20191211 Address after: 315000 second floor, 803, building 8, mold industrial park, nanbinbei Road, Binhai New Area, Ningbo, Zhejiang Province Patentee after: Ningbo Huace Electronic Technology Co., Ltd Address before: 311106 No. 268 Kang Road, Tangqi Town, Yuhang District, Zhejiang, Hangzhou Patentee before: Hangzhou Dehao Huanbao Cailiao Co., Ltd. |