CN109194370B - High-frequency RFID radio frequency signal monitoring system and method - Google Patents
High-frequency RFID radio frequency signal monitoring system and method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/73—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for taking measurements, e.g. using sensing coils
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/77—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for interrogation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
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Abstract
The invention discloses a high-frequency RFID radio frequency signal monitoring system and a high-frequency RFID radio frequency signal monitoring method. This high frequency RFID radio frequency signal monitoring system includes: the device comprises a waveform acquisition module, a rectification filtering module, a data preprocessing module and a decoding module. The waveform acquisition module is used for acquiring waveform data of the radio frequency signal between the reader and the transponder. And the rectification filtering module is coupled with the waveform acquisition module and is used for rectifying and filtering the waveform acquired by the waveform acquisition module. The data preprocessing module is coupled with the rectification filtering module and is used for carrying out digital preprocessing on the waveform data after rectification filtering. The decoding module is coupled with the data preprocessing module and used for decoding the digital data of the data preprocessing module to obtain communication data between the reader and the transponder. The high-frequency RFID radio frequency signal monitoring system and method can monitor high-frequency radio frequency signals by using the existing general equipment, are low in implementation cost and can be widely applied.
Description
Technical Field
The present invention relates to radio frequency identification technology, and more particularly, to a system and method for monitoring high frequency RFID radio frequency signals.
Background
Radio Frequency Identification (RFID) technology is a non-contact automatic identification technology implemented using radio frequency communication. The RFID system comprises a transponder and a reader, wherein the reader loads downlink data to be sent to a carrier radio frequency signal in a specific modulation mode after encoding, the downlink data is sent to the outside through an antenna, the transponder demodulates and decodes the radio frequency signal after receiving the radio frequency signal to obtain downlink data sent by the reader, and the uplink data returned by the transponder is sent to the reader through the transponder antenna after encoding and modulating. RFID systems can be divided into low frequency, high frequency and ultra high frequency by carrier frequency. The working frequency of the high-frequency RFID system is 13.56MHz, the high-frequency RFID system can be divided into two international standards of ISO14443 and ISO15693 according to protocol standards, and the high-frequency RFID system is mainly applied to scenes such as public transportation systems, identity recognition, logistics management, access control systems and the like.
In a high-frequency RFID system, for reasons of system debugging or fault analysis, it is necessary to monitor a radio frequency signal between a reader and a transponder and acquire communication data (including uplink data and downlink data) between the reader and the transponder. The monitoring equipment special for the high-frequency RFID system in the current market is provided by a few manufacturers, has higher cost and is not beneficial to wide application and popularization.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a high-frequency RFID radio frequency signal monitoring system and a high-frequency RFID radio frequency signal monitoring method, which can monitor high-frequency radio frequency signals by using the existing general equipment, have low implementation cost and can be widely applied.
In order to achieve the purpose, the invention provides a high-frequency RFID radio frequency signal monitoring system. It includes: the device comprises a waveform acquisition module, a rectification filtering module, a data preprocessing module and a decoding module. The waveform acquisition module is used for acquiring waveform data of the radio frequency signal between the reader and the transponder. And the rectification filtering module is coupled with the waveform acquisition module and is used for rectifying and filtering the waveform acquired by the waveform acquisition module. The data preprocessing module is coupled with the rectification filtering module and used for preprocessing the waveform data after rectification filtering and finally converting the waveform data into corresponding high-low digital signals. The decoding module is coupled with the data preprocessing module and used for decoding the digital signals output by the data preprocessing module to obtain communication data between the reader and the transponder.
In a preferred embodiment, the rectifying and filtering module comprises a rectifying module and a filtering module. The rectification module is used for rectifying the waveform data acquired by the waveform acquisition module. And the filtering module is coupled with the rectifying module and is used for performing low-pass filtering on the rectified waveform data.
In a preferred embodiment, the data preprocessing module includes: the device comprises a threshold setting module and a high-low level coding module. The threshold setting module is coupled with the rectifying and filtering module and used for determining a level threshold according to the waveform data information output by the rectifying and filtering module. The high-low level coding module is coupled to the threshold setting module, and configured to code each band of the rectified and filtered waveform as 1 or 0 according to the level threshold, where if the level value of the band is greater than the level threshold, the level corresponding to the band is a high level and is coded as 1, and if the level value of the band is less than the level threshold, the level corresponding to the band is a low level and is coded as 0.
In a preferred embodiment, the level threshold in the threshold setting module is obtained by averaging the maximum value and the minimum value of the amplitude of the rectified and filtered waveform.
In a preferred embodiment, the high frequency RFID radio frequency signal monitoring system further includes: and a transmission module. The transmission module is coupled with the waveform acquisition module and the rectification and filtering module, and is used for transmitting the waveform data acquired by the waveform acquisition module to the rectification and filtering module, and the transmission module comprises a USB interface, a network port or a serial port.
In a preferred embodiment, the waveform acquisition module is an oscilloscope.
The invention also provides a high-frequency RFID radio frequency signal monitoring method. The high-frequency RFID radio frequency signal monitoring method comprises the following steps: acquiring waveform data of a radio frequency signal between a reader and a transponder; rectifying and filtering the acquired waveform; carrying out digital preprocessing on the waveform data after the rectification filtering; and decoding the digital signal after the digital preprocessing to obtain the communication data between the reader and the transponder.
In a preferred embodiment, the rectifying and filtering the acquired waveform includes: taking an absolute value of the amplitude data of the acquired waveform to realize a rectification process; low pass filtering is performed using a butterworth digital filtering algorithm.
In a preferred embodiment, the performing digital preprocessing on the rectified and filtered waveform data includes: determining a level threshold according to the waveform data information output by the rectifying and filtering module; and coding each wave band of the rectified and filtered waveform into 1 or 0 according to the level threshold, if the level value of the wave band is greater than the level threshold, the level corresponding to the wave band is a high level, and the level is 1, and if the level value of the wave band is less than the level threshold, the level corresponding to the wave band is a low level, and the level is 0.
In a preferred embodiment, determining the level threshold comprises: obtaining the maximum value and the minimum value of the waveform amplitude output by the rectifying and filtering module; and calculating the average value of the maximum value and the minimum value, wherein the average value is the level threshold value.
Compared with the prior art, the high-frequency RFID radio frequency signal monitoring method can monitor the transmission signal between the reader and the responder and acquire the communication data between the reader and the responder by only some conventional general devices and some software algorithms on the premise of not needing special RFID monitoring equipment, thereby achieving the purposes of system debugging, fault analysis and the like of an RFID system, realizing lower cost and being widely applied.
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FIG. 1 is a high frequency RFID radio frequency signal monitoring system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a high frequency RFID radio frequency signal monitoring method according to an embodiment of the invention;
FIG. 3 is a diagram of rectified and filtered waveforms according to an embodiment of the present invention;
FIG. 4 is a method of determining a level threshold according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a digitization processing method according to an embodiment of the invention.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Aiming at the defects in the prior art, the invention provides a high-frequency RFID radio frequency signal monitoring system and a high-frequency RFID radio frequency signal monitoring method, wherein a universal radio frequency signal waveform acquisition module such as an oscilloscope is adopted for waveform acquisition, signal processing of waveform data is realized by means of a software algorithm, and extraction of communication data is completed, namely the existing universal equipment is used for realizing high-frequency RFID signal monitoring with lower cost.
Fig. 1 is a high frequency RFID radio frequency signal monitoring system according to an embodiment of the present invention. The high-frequency RFID radio frequency signal monitoring system comprises a waveform acquisition module 10, a transmission module 11, a rectification filtering module 12, a data preprocessing module 13 and a decoding module 14.
The waveform collection module 10 is used to collect the rf signal between the reader 200 and the transponder 300, and the waveform collection module 10 may be implemented by a general signal collection device such as an oscilloscope. The waveform acquisition module 10 receives the uplink radio frequency signal of the transponder 300 through the coupling of the induction coil, and stores the uplink radio frequency signal as corresponding radio frequency signal waveform data after the AD conversion.
The transmission module 11, the rectifying and filtering module 12, the data preprocessing module 13 and the decoding module 14 can be realized by an upper computer algorithm.
The transmission module 11 is configured to transmit the radio frequency signal waveform data acquired by the waveform acquisition module 10 to the rectification and filtering module 12 through a universal transmission interface such as a USB, a network port, or a serial port, and in another embodiment, the transmission module 11 may not be needed, and communication is directly established between the waveform acquisition module 10 and the rectification and filtering module 12.
The rectifying and filtering module 12 is configured to perform rectifying and filtering processing on the radio frequency signal waveform data from the transmission module 11, remove a carrier frequency, and retain modulation information of the reader 200 and the transponder 300. In the present embodiment, the rectifying and filtering module 12 includes a rectifying module and a filtering module. The rectification module is used for rectifying the waveform data acquired by the waveform acquisition module. Optionally, the rectification method is to take an absolute value of the amplitude data of the radio frequency signal waveform, and change the amplitude data of a negative value into positive value data of an equivalent value. The filtering module is used for carrying out low-pass filtering on the rectified waveform data. Preferably, the low-pass filtering process may be performed using a butterworth digital filtering algorithm.
The data preprocessing module 13 is configured to perform digital preprocessing on the rectified and filtered waveform data. Preferably, the data preprocessing module 13 includes a threshold setting module and a high-low level coding module.
And the threshold setting module is used for determining a level threshold according to the waveform data information output by the rectifying and filtering module. The method for determining the level threshold comprises the following steps: and analyzing the modulation information output by the radio frequency signal waveform data rectifying and filtering algorithm module, and determining a reasonable threshold value according to the magnitude of the modulation information amplitude of the reader 200 and the responder 300. In the present embodiment, the level threshold is an average value of the maximum value MAX and the minimum value MIN of the modulation information output from the rectifying and filtering module, that is, (MAX + MIN)/2.
The high-low level coding module is configured to code each band of the rectified and filtered waveform into 1 or 0 according to the level threshold, if the level value of the band is greater than the level threshold, the level corresponding to the band is a high level, and the level is 1, and if the level value of the band is less than the level threshold, the level corresponding to the band is a low level, and the level is 0.
The decoding module 14 decodes the digitized data output by the data preprocessing module 13 according to the encoding and decoding rules of the standard corresponding to the RFID system, so as to obtain final communication data (including uplink data and downlink data). The standard encoding and decoding rules comprise ISO14443 and ISO15693 standards. The embodiment adopts the ISO15693 standard for decoding.
The invention also provides a high-frequency RFID radio frequency signal monitoring method, and FIG. 2 is a flow chart of the high-frequency RFID radio frequency signal monitoring method according to an embodiment of the invention.
The high-frequency RFID radio frequency signal monitoring method comprises the steps S1-S4.
Waveform data of the radio frequency signal between the reader and the transponder is collected in S1.
In S2, the acquired waveform is rectified and filtered, preferably, in the present embodiment, the following method is adopted: firstly, the absolute value of the amplitude data of the acquired waveform is taken so as to complete rectification, and then the rectified waveform is subjected to low-pass filtering by using a Butterworth digital filtering algorithm. The rectified and filtered waveform is shown in fig. 3. The horizontal axis in fig. 3, 4 and 5 represents the number of sampling points at a sampling frequency of 50 MHz. The vertical axis in fig. 3, 4 and 5 represents voltage in V.
In S3, the waveform data after the rectification filtering is subjected to the digital preprocessing, and preferably, the digital preprocessing is performed in the present embodiment by the following method: first, a level threshold is determined according to the waveform data information output by the rectifying and filtering module, in this embodiment, as shown in fig. 4, the level threshold is an average value of a maximum value MAX and a minimum value MIN of the waveform amplitude output by the rectifying and filtering module, then, as shown in fig. 5, each band of the waveform after rectifying and filtering is encoded to be 1 or 0 according to the level threshold, if the level value of the band is greater than the level threshold, the level corresponding to the band is a high level, the level is encoded to be 1, and if the level value of the band is less than the level threshold, the level corresponding to the band is a low level, and the level is encoded to be 0.
The digitized data is decoded in S4 to obtain communication data between the reader and the transponder.
In summary, the high-frequency RFID signal monitoring system can monitor the transmission signal between the reader and the transponder only by using some conventional general-purpose devices and some software algorithms of the upper computer on the premise of not requiring a dedicated RFID monitoring device, obtain the communication data between the reader and the transponder, achieve the purposes of system debugging and fault analysis of the RFID system, and achieve a low cost, and can be widely applied.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the scope of protection thereof, and although the present application is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: after reading this application, those skilled in the art will be able to make various changes, modifications and equivalents to the embodiments of the application, which are within the scope of the claims.
Claims (8)
1. A high frequency RFID radio frequency signal monitoring system, comprising:
the waveform acquisition module is used for acquiring waveform data of the radio frequency signal between the reader and the transponder;
the rectification filtering module is coupled with the waveform acquisition module and is used for rectifying and filtering the waveform acquired by the waveform acquisition module;
the data preprocessing module is coupled with the rectification filtering module and is used for carrying out digital processing on the waveform data subjected to rectification filtering; and
a decoding module coupled with the data preprocessing module and used for decoding the digitalized data output by the data preprocessing module to obtain the communication data between the reader and the responder,
wherein the data preprocessing module comprises:
the threshold setting module is coupled with the rectifying and filtering module and used for determining a level threshold according to the waveform data information output by the rectifying and filtering module; and
and the high and low level coding module is coupled with the threshold setting module and is used for coding each wave band of the rectified and filtered waveform into 1 or 0 according to the level threshold, if the level value of the wave band is greater than the level threshold, the level corresponding to the wave band is a high level and is coded into 1, and if the level value of the wave band is less than the level threshold, the level corresponding to the wave band is a low level and is coded into 0.
2. The high frequency RFID radio frequency signal monitoring system of claim 1, wherein the rectifying and filtering module comprises:
the rectification module is coupled with the waveform acquisition module and is used for rectifying the waveform data acquired by the waveform acquisition module; and
and the filtering module is coupled with the rectifying module and is used for performing low-pass filtering on the rectified waveform data.
3. The high frequency RFID radio frequency signal monitoring system according to claim 1, wherein the level threshold in the threshold setting module is obtained by averaging the maximum and minimum values of the rectified and filtered waveform amplitude.
4. The high frequency RFID radio frequency signal monitoring system according to claim 1, wherein the high frequency RFID radio frequency signal monitoring system further comprises:
and the transmission module is coupled with the waveform acquisition module and the rectification and filtering module and is used for transmitting the waveform data acquired by the waveform acquisition module to the rectification and filtering module, and the transmission module comprises a USB interface, a network port or a serial port.
5. The high frequency RFID radio frequency signal monitoring system according to claim 1, wherein the waveform acquisition module is an oscilloscope.
6. A high-frequency RFID radio frequency signal monitoring method is characterized by comprising the following steps:
acquiring waveform data of a radio frequency signal between a reader and a transponder;
rectifying and filtering the acquired waveform;
carrying out digital processing on the waveform data after the rectification filtering; and
decoding the digitalized data to obtain the communication data between the reader and the transponder,
wherein, the step of performing digital processing on the rectified and filtered waveform data comprises the following steps:
determining a level threshold according to waveform data information output by the rectifying and filtering module; and
and coding each wave band of the rectified and filtered waveform into 1 or 0 according to the level threshold, if the level value of the wave band is greater than the level threshold, the level corresponding to the wave band is a high level, and the level is 1, and if the level value of the wave band is less than the level threshold, the level corresponding to the wave band is a low level, and the level is 0.
7. The method for high frequency RFID radio frequency signal listening as claimed in claim 6, wherein said rectifying and filtering the acquired waveform comprises:
taking an absolute value of the amplitude data of the acquired waveform to realize a rectification process; and
low pass filtering is performed using a butterworth digital filtering algorithm.
8. The high frequency RFID radio frequency signal listening method of claim 6, wherein determining a level threshold comprises:
obtaining the maximum value and the minimum value of the waveform amplitude output by the rectifying and filtering module; and
and calculating the average value of the maximum value and the minimum value, wherein the average value is the level threshold value.
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| CN102236801A (en) * | 2010-04-21 | 2011-11-09 | 中国电子技术标准化研究所 | Detecting system for radio frequency identification |
| CN203325012U (en) * | 2013-06-26 | 2013-12-04 | 南京三宝科技股份有限公司 | Multi-directional automatic reader-writer label test detection device |
| CN106815512A (en) * | 2017-01-12 | 2017-06-09 | 河南机电高等专科学校 | A kind of computer security management system and method based on RFID |
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| US9135805B2 (en) * | 2012-03-27 | 2015-09-15 | IntelligentM | Methods and systems for encouraging and enforcing hand hygiene |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102236801A (en) * | 2010-04-21 | 2011-11-09 | 中国电子技术标准化研究所 | Detecting system for radio frequency identification |
| CN203325012U (en) * | 2013-06-26 | 2013-12-04 | 南京三宝科技股份有限公司 | Multi-directional automatic reader-writer label test detection device |
| CN106815512A (en) * | 2017-01-12 | 2017-06-09 | 河南机电高等专科学校 | A kind of computer security management system and method based on RFID |
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