CN108388820B - Signal mode detection device, dual-frequency passive electronic tag and electronic tag system - Google Patents
Signal mode detection device, dual-frequency passive electronic tag and electronic tag system Download PDFInfo
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- CN108388820B CN108388820B CN201810371958.XA CN201810371958A CN108388820B CN 108388820 B CN108388820 B CN 108388820B CN 201810371958 A CN201810371958 A CN 201810371958A CN 108388820 B CN108388820 B CN 108388820B
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10019—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
- G06K7/10069—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the frequency domain, e.g. by hopping from one frequency to the other
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
- G06K17/0029—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device the arrangement being specially adapted for wireless interrogation of grouped or bundled articles tagged with wireless record carriers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10297—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves arrangements for handling protocols designed for non-contact record carriers such as RFIDs NFCs, e.g. ISO/IEC 14443 and 18092
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The embodiment of the invention discloses a signal mode detection device, a dual-frequency passive electronic tag and an electronic tag system. The signal pattern detection device includes: the switching control circuit is used for controlling power supply for the signal detection circuit and the mode judging circuit when the switching control circuit is positioned in a radiation field of the first frequency band signal or the second frequency band signal; the signal detection circuit is used for detecting the first frequency band signal and sending a signal detection result to the mode judgment circuit; the mode judging circuit is used for determining a signal mode corresponding to the current radiation field according to the signal detection result. The dual-frequency passive electronic tag comprising the signal mode detection device can automatically judge the signal mode of the radio frequency field where the dual-frequency passive electronic tag is located, and complete data interaction with a reader-writer in a working mode matched with the dual-frequency passive electronic tag, so that the advantages of two frequency band tag technologies are considered.
Description
Technical Field
The embodiment of the invention relates to the technical field of radio frequency identification and wireless sensing, in particular to a signal mode detection device, a dual-frequency passive electronic tag and an electronic tag system.
Background
The electronic tag applying the RFID (Radio Frequency Identification ) technology can realize the space coupling of radio frequency signals with the reader-writer through the coupling element, and realize the energy transfer and data exchange in the coupling channel, thereby being applied to the fields of identification, article tracking, information acquisition and the like.
According to the operating Frequency of radio Frequency, the electronic tag can be classified into an LF (Low Frequency) tag, an HF (High Frequency) tag, and an UHF (Ultra High Frequency ) tag. The high-frequency tag technology is widely applied to the fields of identity recognition, ticket document recognition and the like, but has the problems of short working distance, low recognition speed, inapplicability to multi-target quick reading and the like. The ultrahigh frequency tag technology has the advantages of low power consumption, high sensitivity, long working distance, strong group reading and counting capability, outstanding application in metal environment resistance and the like, but the ultrahigh frequency tag must use a special reader-writer, and the special reader-writer has high cost and is not suitable for carrying. In addition, in some application fields, remote identification of the ultrahigh frequency tag technology is rather a drawback, and problems of read-through and passive reading are easy to occur.
In order to make the high frequency tag technology and the ultra high frequency tag technology complement each other, a dual frequency tag technology has been developed. For example, in the production and logistics links of the commodity, the advantage of long working distance and strong group reading capability of the ultrahigh frequency label technology is utilized to control the commodity, and when the commodity enters the market and the hand of a consumer, the advantage of simple corresponding read-write equipment and low cost of the high frequency label technology will play a role. However, how to determine whether a dual-frequency tag is in the HF field or in the UHF field is a technical problem to be solved.
Disclosure of Invention
The embodiment of the invention provides a signal mode detection device, a dual-frequency passive electronic tag and an electronic tag system, which are used for automatically judging the signal mode of a radiation field, and further setting a matched working mode for data interaction.
In a first aspect, an embodiment of the present invention provides a signal mode detection apparatus, including: a switch control circuit, a signal detection circuit and a mode judgment circuit, wherein,
the input end of the switch control circuit is used for connecting the output end of the first frequency band signal receiving circuit and the output end of the second frequency band signal receiving circuit; the input end of the signal detection circuit is used for being connected with the output end of the first frequency band signal receiving circuit;
the switch control circuit is used for controlling the power supply of the signal detection circuit and the mode judgment circuit when the switch control circuit is positioned in the radiation field of the first frequency band signal or the second frequency band signal;
the signal detection circuit is used for detecting the first frequency band signal and sending a signal detection result to the mode judgment circuit;
and the mode judging circuit is used for determining a signal mode corresponding to the current radiation field according to the signal detection result.
In a second aspect, an embodiment of the present invention further provides a dual-frequency passive electronic tag, including: the signal mode detection device, the first frequency band signal receiving circuit, the second frequency band signal receiving circuit and the baseband digital processing module provided by any embodiment of the invention, wherein,
the first input end of the signal mode detection device is connected with the output ends of the first frequency band signal receiving circuit and the second frequency band signal receiving circuit respectively, the second input end of the signal mode detection device is connected with the output end of the first frequency band signal receiving circuit, and the output end of the signal mode detection device is connected with the input end of the baseband digital processing module; the baseband digital processing module is respectively connected with the first frequency band signal receiving circuit and the second frequency band signal receiving circuit;
the first frequency band signal receiving circuit is used for receiving and processing a first frequency band signal of the radio frequency field and finishing data interaction with a reader-writer providing the radio frequency field in cooperation with the baseband digital processing module;
the second frequency band signal receiving circuit is used for receiving and processing a second frequency band signal of the radio frequency field and finishing data interaction with a reader-writer providing the radio frequency field in cooperation with the baseband digital processing module;
the signal mode detection device is used for detecting a signal mode corresponding to the current radiation field and sending a detection result to the baseband digital processing module;
the baseband digital processing module is used for sending the matched configuration parameters to the first frequency band signal receiving circuit or the second frequency band signal receiving circuit for configuration according to the detection result, and completing data interaction with a reader-writer providing the radio frequency field by matching with the first frequency band signal receiving circuit or the second frequency band signal receiving circuit.
In a third aspect, an embodiment of the present invention further provides an electronic tag system, including: the dual-frequency passive electronic tag and the reader-writer provided by any embodiment of the invention, wherein,
the reader-writer is used for providing a radio frequency field and carrying out data interaction with the dual-frequency passive electronic tag based on radio frequency signals;
the dual-frequency passive electronic tag is used for determining a signal mode of a radio frequency field according to a received radio frequency signal, and performing data interaction with the reader-writer based on the matched radio frequency signal mode after configuring the dual-frequency passive electronic tag according to the determined signal mode.
The signal mode detection device detects one of two frequency band signals to determine the signal mode of the radiation field, so that the double-frequency passive electronic tag comprising the signal mode detection device can automatically judge the signal mode of the radio frequency field, and the data interaction with a reader-writer providing the radio frequency field is completed in a working mode matched with the signal mode, thereby taking the advantages of two frequency band tag technologies into consideration.
Drawings
Fig. 1 is a schematic diagram of a signal pattern detection device according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a signal pattern detection device according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a dual-frequency passive electronic tag according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a dual-frequency passive electronic tag according to a third embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic tag system according to a fourth embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a schematic structural diagram of a signal mode detection device according to an embodiment of the present invention, where the signal mode detection device is suitable for automatically determining a signal mode corresponding to a current radiation field of a dual-frequency passive electronic tag, and the device can be generally implemented in a hardware manner.
As shown in fig. 1, the signal pattern detection apparatus 100 includes: a switch control circuit 110, a signal detection circuit 120, and a mode judgment circuit 130, which are connected in this order, wherein,
an input 1101 of the switch control circuit 110 is configured to be connected to an output 2101 of the first band signal receiving circuit 210 and an output 2201 of the second band signal receiving circuit 220; the input terminal 1201 of the signal detection circuit 120 is connected to the output terminal 2101 of the first frequency band signal receiving circuit 210.
The output terminal 1102 of the switch control circuit 110 is connected to the signal detection circuit 120 and the mode determination circuit 130, respectively, and the signal detection circuit 120 and the mode determination circuit 130 are connected.
A switch control circuit 110 for controlling the power supply of the signal detection circuit 120 and the mode judgment circuit 130 when the switch control circuit is in the radiation field of the first frequency band signal or the second frequency band signal;
the signal detection circuit 120 is configured to detect the first frequency band signal, and send a signal detection result to the mode determination circuit 130;
the mode judging circuit 130 is configured to determine a signal mode corresponding to the current radiation field according to the signal detection result.
In order to make the detection result of the signal mode detection apparatus 100 more accurate, the frequency ranges of the first frequency band signal and the second frequency band signal may be different to a larger extent, for example, the first frequency band signal is a high frequency radio frequency signal (about 13.56 MHz), and the second frequency band signal is an ultra-high frequency radio frequency signal (about 860MHz to 960 MHz).
The signal pattern detection device 100 is connected to the first frequency band signal receiving circuit 210 and the second frequency band signal receiving circuit 220, and then placed in a radiation field of the first frequency band signal or the second frequency band signal. The first frequency band signal receiving circuit 210 may receive the radiation signal if the radiation signal of the radiation field is the first frequency band signal, and the second frequency band signal receiving circuit 220 may receive the radiation signal if the radiation signal of the radiation field is the second frequency band signal. After the signal pattern detection device 100 is connected to the first frequency band signal receiving circuit 210 and the second frequency band signal receiving circuit 220, by determining the output signal of the first frequency band signal receiving circuit 210, it is possible to determine which radiation signal of the radiation field is, and further determine the signal pattern corresponding to the current radiation field.
Specifically, the switch control circuit 110 receives the level signal through the first frequency band signal receiving circuit 210 or the second frequency band signal receiving circuit 220, and as long as the signal energy of the first frequency band signal or the second frequency band signal is strong enough, the first frequency band signal receiving circuit 210 or the second frequency band signal receiving circuit 220 can send a high enough level signal to the switch control circuit 110, and when the preset threshold point of the switch control circuit 110 is reached, the switch control circuit 110 can perform power supply control for the signal detection circuit 120 and the mode judging circuit 130, so that the signal detection circuit 120 and the mode judging circuit 130 are powered on. Meanwhile, the signal detection circuit 120 and the mode determination circuit 130 can also be powered on to indicate that the radiation signal of the current radiation field is either the first frequency band signal or the second frequency band signal, and the signal mode detection device 100 can determine whether the radiation signal is the first frequency band signal or the second frequency band signal.
Further, as shown in fig. 2, the switch control circuit 110 specifically includes: a power-on judging circuit 111, and a switch control circuit 112, wherein,
the input end 1111 of the power-on judging circuit 111 is connected to the output end 2101 of the first frequency band signal receiving circuit 210 and the output end 2201 of the second frequency band signal receiving circuit 220, the output end 1112 of the power-on judging circuit 111 is connected to the switch control circuit 112, and the power-on judging circuit 111 is configured to receive a level signal output by the output end 2101 of the first frequency band signal receiving circuit 210 or the output end 2201 of the second frequency band signal receiving circuit 220, and send an on signal to the switch control circuit 112 when the level signal meets a preset condition;
the switch control circuit 112 is connected to the signal detection circuit 120 and the mode judging circuit 130, respectively, and is configured to supply power to the signal detection circuit 120 and the mode judging circuit 130 when receiving the on signal.
Specifically, after the first frequency band signal receiving circuit 210 or the second frequency band signal receiving circuit 220 receives the first frequency band signal or the second frequency band signal with sufficient strength, the signal is converted into a dc level and sent to the power-on determining circuit 111, and when the dc level reaches a preset threshold point of the power-on determining circuit 111, the power-on determining circuit 111 sends an on signal to the switch control circuit 112, for example, a high level. The switch control circuit 112 receives the start signal and powers up the signal detection circuit 120 and the mode determination circuit 130, so that the signal detection circuit 120 and the mode determination circuit 130 complete corresponding operations after powering up.
Further, the switch control circuit 112 may also control the signal detection circuit 120 and the mode determination circuit 130 to be powered off, specifically, the switch control circuit 112 may receive the signal mode determination result returned by the mode determination circuit 130, and after receiving the signal mode determination result, control the signal detection circuit 120 and the mode determination circuit 130 to be turned off, so as to save power consumption.
After the signal detection circuit 120 is powered on, the signal received by the first frequency band signal receiving circuit 210 is detected, and the corresponding detection result is sent to the mode determining circuit 130, so that the mode determining circuit 130 determines a signal mode corresponding to the current radiation field according to the detection result.
Specifically, the signal detection circuit 120 may detect the frequency or period of the received signal, extract a portion of the signal from the received signal, convert the signal into a square wave clock signal, detect the frequency or period of the square wave clock signal, and send the detection result to the mode judgment circuit 130 for judgment, where if the mode judgment circuit 130 determines that the difference between the received detection result and the matched preset result is smaller than the set threshold, the signal mode corresponding to the current radiation field is considered to be the first frequency band signal, otherwise, the signal mode corresponding to the current radiation field is considered to be the second frequency band signal.
As a specific implementation of this embodiment, as shown in fig. 2, the signal detection circuit 120 includes: a real-time clock generating circuit 121, a preset clock generating circuit 122, and a counting circuit 123, wherein,
the real-time clock generating circuit 121 is connected to the output end 2101 of the first frequency band signal receiving circuit 210, and is configured to convert a sine wave extracted from the output signal of the output end 2101 of the first frequency band signal receiving circuit 210 into a first square wave, and take the first square wave as a real-time clock signal;
the preset clock generating circuit 122 is configured to generate a second square wave with a fixed frequency, and take the second square wave as a preset clock signal;
an input terminal 1231 of the counting circuit 123 is respectively connected to the output terminal 1211 of the real-time clock generating circuit 121 and the output terminal 1221 of the preset clock generating circuit 122, and the counting circuit 123 is configured to sample and count the preset clock signal according to the real-time clock signal;
the input 1301 of the mode determining circuit 130 is connected to the output 1232 of the counting circuit 123, and the mode determining circuit 130 is configured to determine a signal mode corresponding to the current radiation field according to the counting result.
Specifically, the real-time clock generating circuit 121 extracts a sine wave of a corresponding frequency from the signal output from the output terminal 2101 of the first frequency band signal receiving circuit 210, and converts the sine wave into a first square wave. If the radiation signal of the current radiation field is the first frequency band signal, the frequency of the sine wave is about the frequency of the first frequency band signal, and then the frequency of the first square wave is about the frequency; if the radiation signal of the current radiation field is the second frequency band signal, the real-time clock generating circuit 121 cannot extract the sine wave from the signal output by the output end 2101 of the first frequency band signal receiving circuit 210, or extract the waveform with the second frequency due to factors such as antenna coupling, so that the first square wave cannot be formed, or generate the first square wave with the second frequency, where the second frequency refers to the frequency of the second frequency band signal. Thus, the first square wave is a clock signal generated in real time according to the received signal.
The preset clock generating circuit 122 generates a second square wave with a fixed frequency, where the second square wave with the fixed frequency is a square wave signal generated by the oscillating circuit and the frequency dividing circuit with preset parameters, and the fixed frequency is far smaller than the frequency of the first frequency band signal, that is, when the radiation signal of the current radiation field is the first frequency band signal or the second frequency band signal, the first square wave is a fast clock signal, and the second square wave is a slow clock signal.
The counting circuit 123 collects two clock signals, and uses the first square wave signal to collect the second square wave signal in a set time range, namely uses the fast clock signal to collect the slow clock signal, and the state of the counting circuit is turned once and counted once every time the second square wave signal is collected, and the counted result is sent to the mode judging circuit 130 for judgment.
The mode determining circuit 130 may determine the current signal mode of the radiation field according to the received count result, and compare the count result with a pre-stored count range, and if the count result falls within a preset range (the preset range is determined according to the radiation location where the radiation signal is the first frequency band signal), determine that the signal mode corresponding to the current radiation field is the first frequency band signal.
The signal mode detection device provided in this embodiment is disposed in a radiation field (the signal mode is a first frequency band signal or a second frequency band signal), and when enough energy is obtained through the first frequency band signal receiving circuit or the second frequency band signal receiving circuit, the signal mode detection function of the radiation field can be turned on, so that the signal mode corresponding to the current radiation can be determined. The signal mode detection device is applied to the dual-frequency passive electronic tag, so that the dual-frequency passive electronic tag can automatically judge the signal mode of the radiation field where the dual-frequency passive electronic tag is positioned in the radiation field.
Example two
Fig. 3 is a schematic structural diagram of a dual-frequency passive electronic tag according to a second embodiment of the present invention, where the dual-frequency passive electronic tag is suitable for an article to be identified by radio frequency fields with two different frequencies, and may generally be implemented in a hardware manner.
As shown in fig. 3, the dual-frequency passive electronic tag 200 includes: the signal mode detecting device 100, the first frequency band signal receiving circuit 210, the second frequency band signal receiving circuit 220 and the baseband digital processing module 230 according to any embodiment of the present invention, wherein,
the first input terminal 101 of the signal mode detecting device 100 is connected to the output terminal 2101 of the first frequency band signal receiving circuit 210 and the output terminal 2201 of the second frequency band signal receiving circuit 220, respectively, the second input terminal 102 of the signal mode detecting device 100 is connected to the output terminal 2101 of the first frequency band signal receiving circuit 210, and the output terminal 103 of the signal mode detecting device 100 is connected to the input terminal 2301 of the baseband digital processing module 230; the baseband digital processing module 230 is respectively connected with the first frequency band signal receiving circuit 210 and the second frequency band signal receiving circuit 220;
the first frequency band signal receiving circuit 210 is configured to receive and process a first frequency band signal of the radio frequency field, and cooperate with the baseband digital processing module 230 to complete data interaction with a reader/writer that provides the radio frequency field;
the second frequency band signal receiving circuit 220 is configured to receive and process a second frequency band signal of the radio frequency field, and cooperate with the baseband digital processing module 230 to complete data interaction with a reader/writer that provides the radio frequency field;
the signal pattern detection device 100 is configured to detect a signal pattern corresponding to a current radiation field, and send a detection result to the baseband digital processing module 230;
the baseband digital processing module 230 is configured to send the matched configuration parameters to the first frequency band signal receiving circuit 210 or the second frequency band signal receiving circuit 220 according to the detection result, and complete data interaction with the reader-writer providing the radio frequency field in cooperation with the first frequency band signal receiving circuit 210 or the second frequency band signal receiving circuit 220.
When the dual-band passive electronic tag 200 is in a radio frequency field (transmitting a first frequency band signal or transmitting a second frequency band signal), the first frequency band signal receiving circuit 210 or the second frequency band signal receiving circuit 220 can receive a signal of a matched frequency band, process the received signal into a level signal, send the level signal to the first input end 101 of the signal mode detection device 100, power up the signal mode detection device 100 when the level signal is sufficiently large, detect a signal mode of a current radio frequency field through a signal received by the second input end 102, and send the determined signal mode to the baseband digital processing module 230. The detection manner of the signal mode detection device 100 is detailed in the foregoing embodiment, and is not described herein (wherein the first input terminal 101 corresponds to the input terminal 1101 of the switch control circuit 110, and the second input terminal 102 corresponds to the input terminal 1201 of the signal detection circuit 120).
The signal mode detecting apparatus 100 may output an enable signal to the baseband digital processing module 230, so that the baseband digital processing module 230 is powered on, and a level value of the enable signal may represent a signal mode of a current rf field, for example, a high level enable signal represents a first frequency band signal, and a low level enable signal represents a second frequency band signal.
After confirming the signal mode of the current rf field according to the received enabling signal, the baseband digital processing module 230 reads the configuration parameter of the matching mode and sends the configuration parameter to the corresponding frequency band signal receiving circuit for configuration, where the configuration parameter may include activating a configuration bit of a modem signal module in the first frequency band signal receiving circuit or the second frequency band signal receiving circuit, and may further include optimizing a circuit parameter of the first frequency band signal receiving circuit or the second frequency band signal receiving circuit.
After the configuration of the first frequency band signal receiving circuit 210 or the second frequency band signal receiving circuit 220 is completed, the first frequency band signal receiving circuit or the second frequency band signal receiving circuit can cooperate with the baseband digital processing module 230 to complete the data interaction with the reader-writer providing the radio frequency field, for example, to realize the basic identity recognition function of the electronic tag.
Specifically, the frequency range of the first frequency band signal is smaller than the frequency range of the second frequency band signal. The first frequency band signal may be a high-frequency radio frequency signal, and the second frequency band signal may be an ultrahigh-frequency radio frequency signal. That is, the signal pattern detection apparatus 100 determines a signal pattern corresponding to the current radio frequency field by detecting a first frequency band signal (high frequency radio frequency signal) having a low frequency. Compared with the technical scheme of selecting the first frequency band signal as the ultrahigh frequency radio frequency signal, the power consumption is saved.
Specifically, the first frequency band signal receiving circuit 210 includes a first frequency band signal antenna and a first frequency band signal analog front end that are connected, and the second frequency band signal receiving circuit 220 includes a second frequency band signal antenna and a second frequency band signal analog front end that are connected.
The first frequency band signal antenna is used for receiving a first frequency band signal in the radio frequency field, and the second frequency band signal antenna is used for receiving a second frequency band signal in the radio frequency field.
The first frequency band signal analog front end and the second frequency band signal analog front end at least comprise a rectifying module and a modulation-demodulation module respectively and are used for rectifying and modulating and demodulating the matched frequency band signals.
Further, the baseband digital processing module 230 includes: a baseband digital processing circuit and a memory unit connected, wherein,
the baseband digital processing circuit is respectively connected with the first frequency band signal analog front end, the second frequency band signal analog front end and the signal mode detection device 100, and is used for reading matched configuration parameters from the storage unit according to detection results, sending the configuration parameters to the first frequency band signal analog front end or the second frequency band signal analog front end for configuration, and completing data interaction with a reader-writer providing the radio frequency field by matching with the first frequency band signal analog front end or the second frequency band signal analog front end;
the storage unit is configured to store configuration parameters of the first frequency band signal analog front end and the second frequency band signal analog front end, and tag data information of the dual-frequency passive electronic tag 200.
When the dual-frequency passive electronic tag 200 is in the rf field, the first frequency band signal antenna or the second frequency band signal antenna receives the signal energy, the rectification module in the first frequency band signal analog front end or the second frequency band signal analog front end is activated, the rectification module converts the signal ac signal into the dc level, and when the dc level is large enough, the signal mode of the current rf field is judged by the activated signal mode detection device 100. After receiving the enabling signal representing the signal mode, the baseband digital processing circuit reads the configuration parameters of the matching mode from the storage unit, and sends the configuration parameters to the first frequency band signal analog front end or the second frequency band signal analog front end for configuration, so as to activate a modulation and demodulation module and the like in the first frequency band signal analog front end or the second frequency band signal analog front end, and then the first frequency band signal analog front end or the second frequency band signal analog front end is matched with the baseband digital processing circuit to complete data interaction with the reader-writer.
Specifically, the memory cell may be an EEPROM (Electrically Erasable Programmable Read Only Memory, electrically erasable and programmable read only memory).
The dual-frequency passive electronic tag provided by the embodiment can automatically judge the signal mode of the radio frequency field where the dual-frequency passive electronic tag is located, and complete data interaction with a reader-writer providing the radio frequency field in a matched working mode, so that the advantages of two frequency band tag technologies are considered.
Example III
On the basis of the above embodiments, this embodiment will provide a specific embodiment. The dual-frequency passive electronic tag 200 shown in fig. 4 includes an HF antenna 310, a UHF antenna 320, an HF rf analog front end 330, a UHF rf analog front end 340, a power-on judging circuit 350, a switch control circuit 360, a real-time clock generating circuit 370, a preset clock generating circuit 380, a counting circuit 390, a mode judging circuit 3100, a baseband digital circuit 3110 and an EEPROM 3120, wherein,
the HF antenna 310 is connected to an input of the HF rf analog front end 330, the UHF antenna 320 is connected to an input of the UHF rf analog front end 340, an input of the power-on judging circuit 350 is connected to an output of the HF rf analog front end 330 and an output of the UHF rf analog front end 340, an output of the power-on judging circuit 350 is connected to an input of the switch control circuit 360, an output of the switch control circuit 360 is connected to the real-time clock generating circuit 370, the preset clock generating circuit 380, the counting circuit 390 and the mode judging circuit 3100, an input of the real-time clock generating circuit 370 is connected to an output of the HF rf analog front end 330, an input of the counting circuit 390 is connected to an output of the real-time clock generating circuit 370 and an output of the preset clock generating circuit 380, an output of the counting circuit 390 is connected to an input of the mode judging circuit 3100, an output of the mode judging circuit 3100 is connected to an input of the baseband digital circuit 3110, and the baseband digital circuit 3110 is also connected to the EEPROM 3120, the HF rf analog front end 330 and the UHF rf analog front end 340, respectively.
The HF antenna 310 and the UHF antenna 320 are respectively matched to corresponding working frequencies to achieve the highest sensitivity, when the dual-frequency passive electronic tag 200 enters into HF or UHF field, an alternating current signal is converted into a direct current level through a rectification circuit of the HF radio frequency analog front end 330 or the UHF radio frequency analog front end 340, when the direct current level reaches a threshold value point of the power-on judging circuit 350, the power-on judging circuit 350 outputs a high level, and the high level is transmitted to the switch control circuit 360 to activate the real-time clock generating circuit 370, the preset clock generating circuit 380, the counting circuit 390 and the mode judging circuit 3100. When the dual-frequency passive electronic tag 200 is in an energy field, the real-time clock generating circuit 370 extracts a sine wave of a corresponding frequency from the signal received by the HF antenna 310 via the HF rf analog front end 330 and converts the sine wave into a first square wave. The preset clock generating circuit 380 generates a second square wave with a fixed frequency through the oscillating circuit and the frequency dividing circuit. The counter circuit 390 collects two square wave clocks, uses the first square wave clock to sample the second square wave clock, takes one time, turns over the state once, counts one time, and sends the count value to the mode decision circuit 3100. The mode decision circuit 3100 outputs an HF enable signal, which is high when the count value is within the preset range within a certain period of time, i.e., the current rf field is an HF field, and low when the count value is outside the preset range, i.e., the current rf field is an UHF field. The counter circuit 390 and the mode decision circuit 3100 may be composed of logic gates and flip-flops. The HF enable signal is transmitted to the baseband digital circuit 3110, and the baseband digital circuit 3110 is powered on, the baseband digital circuit 3110 reads configuration information of a corresponding mode from the EEPROM 3120 according to the level of the HF enable signal, and returns the configuration information to the radio frequency analog front end of the corresponding mode to complete the corresponding configuration, and activates the modem module in the corresponding radio frequency analog front end.
Further, the corresponding rf analog front end receives the command signal in the corresponding mode through the rf antenna, demodulates the baseband signal from the command signal, and gives the baseband signal to the baseband digital circuit 3110 for processing, the baseband digital circuit 3110 returns data to the corresponding rf analog front end for modulation after the processing is completed, and the rf analog front end returns the data to the reader-writer through the corresponding antenna after the modulation is completed, so as to complete the data transceiving between the dual-frequency passive electronic tag 200 and the reader-writer.
In the above technical scheme, when the dual-frequency passive electronic tag enters the energy field, when enough energy is acquired, the signal mode detection function is activated, and at this time, the HF radio frequency analog front end and the UHF radio frequency analog front end internal modem module are in a closed state. When the count value of the counting circuit is in a preset range, the counting circuit is judged to be in an HF mode, when the count value is out of the preset range, the counting circuit is judged to be in a UHF mode, the judgment result is transmitted to the baseband digital circuit, the baseband digital circuit is powered on, configuration information of a corresponding mode is read from the EEPROM, the configuration information is returned to the corresponding radio frequency analog front-end circuit, the radio frequency analog front-end circuit starts a modulation and demodulation function of the corresponding mode, and commands of the corresponding mode are received and transmitted, and modulation and demodulation processing work is carried out.
Example IV
Fig. 4 is a schematic structural diagram of an electronic tag system according to a fourth embodiment of the present invention, as shown in fig. 4, where the electronic tag system includes: the dual-frequency passive electronic tag 200 and the reader 300 according to any embodiment of the present invention, wherein,
the reader 300 is used for providing a radio frequency field and performing data interaction with the dual-frequency passive electronic tag 200 based on radio frequency signals;
the dual-frequency passive electronic tag 200 is configured to determine a signal mode of a radio frequency field according to a received radio frequency signal, and perform data interaction with the reader-writer 300 based on a matched radio frequency signal mode after configuring the dual-frequency passive electronic tag 200 according to the determined signal mode.
Specifically, the rf field provided by the reader 300 includes a high frequency rf field and an ultra-high frequency rf field.
When the reader-writer 300 provides a radio frequency field and the dual-frequency passive electronic tag 200 is placed in the radio frequency field, a signal mode of the radio frequency field is determined according to a received radio frequency signal, and then the dual-frequency passive electronic tag 200 is configured according to the determined signal mode and then is configured into a corresponding signal mode, so that data interaction can be performed with the reader-writer 300 through receiving and transmitting the radio frequency signal.
Details of the signal mode of the rf field determined by the dual-frequency passive electronic tag 200 according to the received rf signal are detailed in the foregoing embodiments, and will not be described herein.
It should be noted that the respective units and modules included in the above embodiments are divided according to the functional logic only, but are not limited to the above division, as long as the corresponding functions can be realized; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. A signal pattern detection apparatus, comprising: a switch control circuit, a signal detection circuit and a mode judgment circuit, wherein,
the input end of the switch control circuit is used for connecting the output end of the first frequency band signal receiving circuit and the output end of the second frequency band signal receiving circuit; the input end of the signal detection circuit is used for being connected with the output end of the first frequency band signal receiving circuit;
the switch control circuit is used for controlling power supply and power failure of the signal detection circuit and the mode judgment circuit when the switch control circuit is positioned in the radiation field of the first frequency band signal or the second frequency band signal; comprising the following steps: after receiving a signal mode judging result, controlling to close the signal detection circuit and the mode judging circuit;
the signal detection circuit is used for detecting the frequency or the period of the first frequency band signal and sending a signal detection result to the mode judgment circuit;
the mode judging circuit is used for determining a signal mode corresponding to the current radiation field according to the signal detection result;
the mode judging circuit is specifically configured to determine that, if the difference between the detection result and the matched preset result is smaller than a set threshold, the signal mode corresponding to the current radiation field is a first frequency band signal; otherwise, the signal mode corresponding to the current radiation field is the second frequency band signal.
2. The signal pattern detection apparatus according to claim 1, wherein the switch control circuit specifically includes: a power-on judging circuit and a switch control circuit, wherein,
the input end of the power-on judging circuit is connected with the output end of the first frequency band signal receiving circuit and the output end of the second frequency band signal receiving circuit, the output end of the power-on judging circuit is connected with the switch control circuit, and the power-on judging circuit is used for receiving a level signal output by the output end of the first frequency band signal receiving circuit or the output end of the second frequency band signal receiving circuit and sending an opening signal to the switch control circuit when the level signal meets a preset condition;
the switch control circuit is respectively connected with the signal detection circuit and the mode judging circuit and is used for supplying power to the signal detection circuit and the mode judging circuit when the starting signal is received.
3. The signal pattern detection apparatus according to claim 1, wherein the signal detection circuit includes: a real-time clock generating circuit, a preset clock generating circuit and a counting circuit, wherein,
the real-time clock generation circuit is connected with the output end of the first frequency band signal receiving circuit and is used for converting sine waves extracted from the output signals of the output end of the first frequency band signal receiving circuit into first square waves and taking the first square waves as the real-time clock signals;
the preset clock generation circuit is used for generating a second square wave with fixed frequency, and taking the second square wave as the preset clock signal;
the input end of the counting circuit is respectively connected with the output end of the real-time clock generating circuit and the output end of the preset clock generating circuit, and the counting circuit is used for sampling and counting the preset clock signal according to the real-time clock signal;
the input end of the mode judging circuit is connected with the output end of the counting circuit, and the mode judging circuit is used for determining a signal mode corresponding to the current radiation field according to the counting result.
4. A dual-frequency passive electronic tag comprising: the signal pattern detection apparatus according to any one of claims 1 to 3, wherein,
the first input end of the signal mode detection device is respectively connected with the output end of the first frequency band signal receiving circuit and the output end of the second frequency band signal receiving circuit, the second input end of the signal mode detection device is connected with the output end of the first frequency band signal receiving circuit, and the output end of the signal mode detection device is connected with the input end of the baseband digital processing module; the baseband digital processing module is respectively connected with the first frequency band signal receiving circuit and the second frequency band signal receiving circuit;
the first frequency band signal receiving circuit is used for receiving and processing a first frequency band signal of the radio frequency field and finishing data interaction with a reader-writer providing the radio frequency field in cooperation with the baseband digital processing module;
the second frequency band signal receiving circuit is used for receiving and processing a second frequency band signal of the radio frequency field and finishing data interaction with a reader-writer providing the radio frequency field in cooperation with the baseband digital processing module;
the signal mode detection device is used for detecting a signal mode corresponding to the current radiation field and sending a detection result to the baseband digital processing module;
the baseband digital processing module is used for sending the matched configuration parameters to the first frequency band signal receiving circuit or the second frequency band signal receiving circuit for configuration according to the detection result, and completing data interaction with a reader-writer providing the radio frequency field by matching with the first frequency band signal receiving circuit or the second frequency band signal receiving circuit.
5. The electronic tag of claim 4, wherein a frequency range of the first frequency band signal is less than a frequency range of the second frequency band signal.
6. The electronic tag of claim 5, wherein the electronic tag,
the first frequency band signal receiving circuit comprises a first frequency band signal antenna and a first frequency band signal analog front end which are connected, and the second frequency band signal receiving circuit comprises a second frequency band signal antenna and a second frequency band signal analog front end which are connected;
the baseband digital processing module comprises: a baseband digital processing circuit and a memory unit connected, wherein,
the baseband digital processing circuit is respectively connected with the first frequency band signal analog front end, the second frequency band signal analog front end and the signal mode detection device, and is used for reading matched configuration parameters in the storage unit according to the detection result, sending the configuration parameters to the first frequency band signal analog front end or the second frequency band signal analog front end for configuration, and completing data interaction with a reader-writer providing the radio frequency field by matching with the first frequency band signal analog front end or the second frequency band signal analog front end;
the storage unit is used for storing configuration parameters of the first frequency band signal analog front end and the second frequency band signal analog front end and tag data information of the dual-frequency passive electronic tag.
7. The electronic tag of claim 6, wherein said memory unit is an EEPROM.
8. The dual-band passive electronic tag of claim 5, wherein the first band signal is a high frequency radio frequency signal and the second band signal is an ultra high frequency radio frequency signal.
9. An electronic label system, comprising: the dual-frequency passive electronic tag and reader/writer as set forth in any one of claims 4-8, wherein,
the reader-writer is used for providing a radio frequency field and carrying out data interaction with the dual-frequency passive electronic tag based on radio frequency signals;
the dual-frequency passive electronic tag is used for determining a signal mode of a radio frequency field according to a received radio frequency signal, and performing data interaction with the reader-writer based on the matched radio frequency signal mode after configuring the dual-frequency passive electronic tag according to the determined signal mode.
10. The system of claim 9, wherein the rf field provided by the reader/writer comprises a high frequency rf field and an ultra high frequency rf field.
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| CN111310503B (en) * | 2020-01-20 | 2024-03-01 | 上海坤锐电子科技有限公司 | Reader-writer, tag control method and device, tag reading-writing system and storage medium |
| CN113792563A (en) * | 2021-09-24 | 2021-12-14 | 河北工业大学 | Dual-mode radio frequency identification sensor, system and working method |
| CN115719079B (en) * | 2022-11-21 | 2023-05-23 | 深圳市国芯物联科技有限公司 | Baseband architecture of UHF-RFID tag chip and state control method thereof |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100016754A (en) * | 2008-08-05 | 2010-02-16 | 에스케이 텔레콤주식회사 | Radio frequency identification reader for supporting dual band |
| CN101882940A (en) * | 2010-06-24 | 2010-11-10 | 复旦大学 | Ultra-wideband multi-mode automatic identification dual-link radio-frequency receiver front-end chip |
| CN102496048A (en) * | 2011-11-28 | 2012-06-13 | 浙江网新技术有限公司 | Multi-frequency RFID (radio identification) label, read/write device and read/write method |
| CN103297157A (en) * | 2013-05-08 | 2013-09-11 | 岳流锋 | Antenna detecting method for multi-antenna ultrahigh-frequency radiofrequencyidentification reader-writer |
| CN103646230A (en) * | 2013-11-27 | 2014-03-19 | 苏州木兰电子科技有限公司 | Dual-frequency electronic tag-based radio frequency identification system |
| CN104092967A (en) * | 2014-07-14 | 2014-10-08 | 桂林电子科技大学 | Receiver system and receiving method with cognitive function |
| AU2015213426A1 (en) * | 2011-12-29 | 2015-09-10 | Motorola Solutions, Inc. | Method and apparatus for detecting and mitigating radio interference among user equipment and base stations of geographically co-located and spectrally distinct wireless systems |
| CN105490685A (en) * | 2015-11-18 | 2016-04-13 | 张发平 | Multi-band adaptive communication system |
| CN105894081A (en) * | 2016-03-30 | 2016-08-24 | 深圳市远望谷信息技术股份有限公司 | Passive double-frequency electronic label chip and electronic label |
| CN106059628A (en) * | 2015-04-02 | 2016-10-26 | Em微电子-马林有限公司 | Dual-frequency HF-UHF identification equipment, in particular passive type high-frequency identification equipment |
| CN208061213U (en) * | 2018-04-24 | 2018-11-06 | 上海坤锐电子科技有限公司 | Signal mode detection device, double frequency passive electronic label and electronic labelling system |
-
2018
- 2018-04-24 CN CN201810371958.XA patent/CN108388820B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100016754A (en) * | 2008-08-05 | 2010-02-16 | 에스케이 텔레콤주식회사 | Radio frequency identification reader for supporting dual band |
| CN101882940A (en) * | 2010-06-24 | 2010-11-10 | 复旦大学 | Ultra-wideband multi-mode automatic identification dual-link radio-frequency receiver front-end chip |
| CN102496048A (en) * | 2011-11-28 | 2012-06-13 | 浙江网新技术有限公司 | Multi-frequency RFID (radio identification) label, read/write device and read/write method |
| AU2015213426A1 (en) * | 2011-12-29 | 2015-09-10 | Motorola Solutions, Inc. | Method and apparatus for detecting and mitigating radio interference among user equipment and base stations of geographically co-located and spectrally distinct wireless systems |
| CN103297157A (en) * | 2013-05-08 | 2013-09-11 | 岳流锋 | Antenna detecting method for multi-antenna ultrahigh-frequency radiofrequencyidentification reader-writer |
| CN103646230A (en) * | 2013-11-27 | 2014-03-19 | 苏州木兰电子科技有限公司 | Dual-frequency electronic tag-based radio frequency identification system |
| CN104092967A (en) * | 2014-07-14 | 2014-10-08 | 桂林电子科技大学 | Receiver system and receiving method with cognitive function |
| CN106059628A (en) * | 2015-04-02 | 2016-10-26 | Em微电子-马林有限公司 | Dual-frequency HF-UHF identification equipment, in particular passive type high-frequency identification equipment |
| CN105490685A (en) * | 2015-11-18 | 2016-04-13 | 张发平 | Multi-band adaptive communication system |
| CN105894081A (en) * | 2016-03-30 | 2016-08-24 | 深圳市远望谷信息技术股份有限公司 | Passive double-frequency electronic label chip and electronic label |
| CN208061213U (en) * | 2018-04-24 | 2018-11-06 | 上海坤锐电子科技有限公司 | Signal mode detection device, double frequency passive electronic label and electronic labelling system |
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|---|---|
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