CN111222351A - Radio frequency read-write equipment and radio frequency read-write method - Google Patents
Radio frequency read-write equipment and radio frequency read-write method Download PDFInfo
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- CN111222351A CN111222351A CN201811408182.0A CN201811408182A CN111222351A CN 111222351 A CN111222351 A CN 111222351A CN 201811408182 A CN201811408182 A CN 201811408182A CN 111222351 A CN111222351 A CN 111222351A
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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
Abstract
The application discloses radio frequency read-write equipment and a radio frequency read-write method. A digital control device in the radio frequency read-write equipment sends a first radio frequency signal to a radio frequency control device according to a received reading instruction, wherein the first radio frequency signal is used for reading label information of a target radio frequency label; the radio frequency control device carries out first preset signal processing on the first radio frequency signal and sends the processed first radio frequency signal to the radio frequency antenna; receiving a second radio frequency signal which is sent by the radio frequency antenna and comprises the label information of the target radio frequency label; performing second preset signal processing on the second radio frequency signal, and sending the processed second radio frequency signal to the digital control device; the radio frequency antenna transmits the processed first radio frequency signal to a target radio frequency tag and receives a second radio frequency signal transmitted by the target radio frequency tag; the power module supplies power for the digital control device and the radio frequency control device. Therefore, the discrete element design of the radio frequency control device improves the reading speed of the radio frequency reading and writing equipment.
Description
Technical Field
The present application relates to the field of wireless radio frequency technologies, and in particular, to a radio frequency read/write device and a radio frequency read/write method.
Background
Radio Frequency Identification (RFID) is a communication technology that can identify a specific target and read related data through Radio signals. Ultra High Frequency (UHF) refers to radio waves having a Frequency of 300-3000MHz and a wavelength of 1m-1 dm. With the popularization of the internet of things, more and more enterprises realize the benefits brought by the RFID technology in the management process, the demand on the RFID system is more and more clear, and the RFID application is more and more.
The traditional RFID application is realized by adopting a scheme of equipment fixing and label moving; the acquired tag information is communicated with a management system through wired communication (Ethernet, RS485, RS232 and the like) to carry out data management.
However, the existing fixed reader-writer is only applied to the logistics field and the production and manufacturing field, and the corresponding implementation of acquiring vehicle information is not provided for the transportation field outside the logistics field and the production and manufacturing field, and the existing mode of acquiring vehicle information is only acquired by looking up the license plate of a moving vehicle, so that the operation is complex, and the reading and writing efficiency is low.
Disclosure of Invention
The embodiment of the application provides radio frequency read-write equipment and a radio frequency read-write method, which solve the technical problems in the prior art and improve the read-write efficiency.
In a first aspect, a radio frequency read-write device is provided, which includes: the device comprises a digital control device, a radio frequency antenna and a power supply module;
the digital control device is used for sending a first radio frequency signal to the radio frequency control device according to the received reading instruction, wherein the first radio frequency signal is used for reading the label information of the target radio frequency label;
the radio frequency control device is used for carrying out first preset signal processing on the first radio frequency signal and sending the processed first radio frequency signal to the radio frequency antenna; receiving a second radio frequency signal sent by the radio frequency antenna, wherein the second radio frequency signal comprises the tag information of the target radio frequency tag; performing second preset signal processing on the second radio frequency signal, and sending the processed second radio frequency signal to the digital control device;
the radio frequency antenna is used for transmitting the processed first radio frequency signal to the target radio frequency tag and receiving the second radio frequency signal transmitted by the target radio frequency tag;
and the power supply module is used for supplying power to the digital control device and the radio frequency control device.
In an alternative implementation, the apparatus further comprises a voltage conversion device;
the voltage conversion device is used for performing voltage conversion on the voltage provided by the power supply module and respectively providing the converted voltage for the radio frequency control device and the digital control device.
In an optional implementation, the device further comprises a terminal;
and the terminal is used for sending a reading instruction to the digital control device, displaying the label information of the target radio frequency label, and transmitting the label information to a server through a wireless network for information inquiry.
In an alternative implementation, the digital control device is further configured to store the tag information.
In an alternative implementation, the digital control device includes a main control module, an analog-to-digital conversion module and a security module;
the main control module is used for sending a first digital signal to the security module according to the received reading instruction, wherein the first digital signal is used for reading the label information of the target radio frequency label;
the security module is used for encrypting the first digital signal and sending the encrypted first digital signal to the analog-to-digital conversion module;
the analog-to-digital conversion module is used for converting the encrypted first digital signal into a first radio frequency signal and sending the first radio frequency signal to the radio frequency control module; converting the processed second radio frequency signal sent by the radio frequency control module into a second digital signal, and transmitting the second digital signal to the security module, wherein the second digital signal comprises the tag information of the target radio frequency tag;
the security module is further configured to encrypt the second digital signal and send the encrypted second digital signal to the main control module.
In an optional implementation, the radio frequency control device includes a local oscillation modulation module, a transmission link module, a reception link module, a carrier cancellation module, and a demodulation module;
the local oscillator modulation module is used for performing first signal modulation on the first radio frequency signal to obtain a modulated first radio frequency signal; performing second signal modulation on the demodulated second radio frequency signal acquired by the demodulation module to obtain a processed second radio frequency signal, and sending the processed second radio frequency signal to the digital control device;
the transmitting link module is used for performing power amplification and filtering processing on the modulated first radio frequency signal and sending the processed first radio frequency signal to the radio frequency antenna;
the carrier cancellation module is configured to combine the second radio frequency signal with a preset carrier cancellation signal to obtain a combined second radio frequency signal;
the receiving link module is used for performing signal amplification and filtering processing on the combined second radio frequency signal to obtain a semi-processed second radio frequency signal;
and the demodulation module is used for acquiring the demodulated second radio frequency signal by adopting a preset differential conversion and orthogonal demodulation technology on the semi-processed second radio frequency signal.
In an optional implementation, the radio frequency control device further includes a power detection module;
a power detection module, configured to detect whether a signal power of the processed first radio frequency signal is within a preset transmit power range, and detect whether a signal power of the combined second radio frequency signal is within a preset receive power range;
when the signal power of the processed first radio-frequency signal is within the preset transmitting power range, triggering the radio-frequency antenna to transmit the processed first radio-frequency signal to the radio-frequency tag;
and triggering the receiving link module when the signal power of the combined second radio frequency signal is within a preset receiving power range.
In one optional implementation, the transmit chain module includes a power amplifier, a first filter, and a second filter; the carrier wave elimination module comprises a vector regulator, a first low noise amplifier and a combiner; the receive chain module comprises a second low noise amplifier and the third filter; the demodulation module comprises a quadrature demodulator and a differential converter;
the first filter is used for filtering the modulated first radio frequency signal for the first time;
the power amplifier is configured to perform power amplification on the first modulated radio-frequency signal after the primary filtering;
the second filter is configured to perform secondary filtering on the primary-filtered modulated first radio frequency signal;
the vector adjuster is used for receiving the carrier cancellation signal of the in-phase component and the carrier cancellation signal of the orthogonal component to obtain an adjusted carrier cancellation signal and sending the carrier cancellation signal to the first low noise amplifier;
the first low noise amplifier is used for amplifying the carrier cancellation signal to obtain an amplified carrier cancellation signal;
the combiner is used for combining the second radio frequency signal and the amplified carrier cancellation signal to obtain a combined second radio frequency signal;
the third filter is configured to filter the combined second radio frequency signal and send the filtered combined second radio frequency signal to the second low noise amplifier;
the second low noise amplifier is configured to perform signal amplification on the filtered combined second radio frequency signal to obtain a semi-processed second radio frequency signal;
the differential converter is used for performing preset differential conversion on the semi-processed second radio frequency signal to obtain a differential semi-processed second radio frequency signal and sending the differential semi-processed second radio frequency signal to the orthogonal demodulator;
the quadrature demodulator is configured to demodulate the differential half-processed second radio frequency signal to obtain a demodulated second radio frequency signal.
In a second aspect, a radio frequency read-write method is provided, which may include:
transmitting a first radio frequency signal to a target radio frequency tag according to a received reading instruction, wherein the first radio frequency signal is used for reading tag information of the target radio frequency tag;
receiving a second radio frequency signal transmitted by the target radio frequency tag, wherein the second radio frequency signal comprises tag information of the target radio frequency tag;
and acquiring a second digital signal corresponding to the second radio frequency signal.
In a third aspect, an electronic device is provided, which includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory complete communication with each other through the communication bus;
a memory for storing a computer program;
a processor for implementing the method steps of any of the above second aspects when executing a program stored in the memory.
In a fourth aspect, a computer-readable storage medium is provided, having stored therein a computer program which, when executed by a processor, carries out the method steps of any of the above second aspects.
The radio frequency reading and writing equipment of the embodiment of the invention comprises a digital control device, a radio frequency antenna and a power supply module; the digital control device is used for sending a first radio frequency signal to the radio frequency control device according to the received reading instruction, wherein the first radio frequency signal is used for reading the label information of the target radio frequency label; the radio frequency control device is used for carrying out first preset signal processing on the first radio frequency signal and sending the processed first radio frequency signal to the radio frequency antenna; receiving a second radio frequency signal sent by the radio frequency antenna, wherein the second radio frequency signal comprises tag information of a target radio frequency tag; performing second preset signal processing on the second radio frequency signal, and sending the processed second radio frequency signal to the digital control device; the radio frequency antenna is used for transmitting the processed first radio frequency signal to a target radio frequency tag and receiving a second radio frequency signal transmitted by the target radio frequency tag; the power module supplies power for the digital control device and the radio frequency control device. Therefore, the design of the discrete components of the radio frequency control device in the radio frequency read-write equipment improves the reading speed of the radio frequency read-write equipment and ensures the stability of the performance of the equipment.
Drawings
Fig. 1 is a schematic view of a scenario of an application of a radio frequency read-write device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a radio frequency read-write device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a digital control apparatus of FIG. 2;
FIG. 4 is a schematic structural diagram of an RF control apparatus shown in FIG. 2;
fig. 5 is a schematic structural diagram of another radio frequency read-write device according to an embodiment of the present invention;
fig. 6 is a schematic flow chart of a radio frequency read/write method according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without any creative effort belong to the protection scope of the present application.
In order to ensure the detection accuracy, the server is an application server or a cloud server with stronger computing capacity; the terminal may be a User Equipment (UE) such as a Mobile phone, a smart phone, a laptop, a digital broadcast receiver, a Personal Digital Assistant (PDA), a tablet computer (PAD), etc., having a voice capture device and an image capture device, a handheld device, a vehicle-mounted device, a wearable device, a computing device or other processing device connected to a wireless modem, a Mobile Station (MS), etc.
The radio frequency reading and writing equipment (or called radio frequency reader) provided by the embodiment of the invention is applied to a radio frequency identification system, the radio frequency identification system identifies an object by an electronic tag (or called radio frequency tag), and the radio frequency tag exchanges information with the radio frequency reading and writing equipment through radio waves (or called radio frequency signals). The radio frequency tag is composed of a coupling element and a chip, each tag has a unique electronic code, and the high-capacity radio frequency tag has a storage space which can be written by a user and is attached to an object to identify a target object.
The radio frequency reading and writing equipment receives a reading and writing instruction sent by the terminal, transmits a radio frequency signal to the radio frequency tag according to the reading and writing instruction, and after the radio frequency tag receives the radio frequency signal, gives a response radio frequency signal, wherein the response radio frequency signal contains tag information carried by the radio frequency tag, and after receiving the response radio frequency signal, the radio frequency reading and writing equipment transmits the tag information to a server associated with the radio frequency reading and writing equipment, and an information exchange and management system of the server is responsible for finishing the work of storage, management, control and the like of the tag information. The server may be an application service or a cloud server.
The radio frequency read-write equipment is applied to the scene of figure 1 in the traffic field and is used for completing the reading operation of the radio frequency tag of the close-distance vehicle. As shown in fig. 1, the scenario may include a vehicle a and a vehicle B, and the vehicle B may read tag information of a radio frequency tag on the vehicle a using a radio frequency read-write device to store or query relevant information of the vehicle a.
Fig. 2 is a schematic structural diagram of a radio frequency read-write device according to an embodiment of the present invention, and as shown in fig. 2, the radio frequency read-write device may include: a digital control device 210, a radio frequency control device 220, a radio frequency antenna 230, and a power supply module 240.
The rf control module 220 may be connected to the digital control module 210 through a Serial Peripheral Interface (SPI), a Universal Asynchronous Receiver/Transmitter (UART), and the like; the radio frequency control device is connected with the radio frequency antenna.
The digital control device 210 is configured to send a first radio frequency signal to the radio frequency control device 220 according to the received reading instruction, where the first radio frequency signal is used to read tag information of a target radio frequency tag;
the reading instruction may be an instruction sent by the server to the radio frequency read-write device, or an instruction sent by the user when the radio frequency read-write device is started.
The rf control device 220 is configured to perform a first preset signal processing on the first rf signal, and send the processed first rf signal to the rf antenna 230;
and receiving a second radio frequency signal sent by the radio frequency antenna 230, where the second radio frequency signal includes tag information of the target radio frequency tag;
performing second preset signal processing on the second radio frequency signal, and sending the processed second radio frequency signal to the digital control device 210;
the digital control device 210 performs analog-to-digital conversion on the processed second radio frequency signal to obtain a corresponding digital signal, where the digital signal corresponding to the processed second radio frequency signal includes tag information of the target radio frequency tag, and stores the tag information.
The rf antenna 230 is configured to transmit the processed first rf signal to a target rf tag and receive a second rf signal transmitted by the target rf tag;
and a power module 240 for supplying power to the digital control device 210 and the radio frequency control device 220, wherein the power module 240 may be a polymer lithium battery.
The digital control device 210 in the rf read/write device controls the read/write operation of the entire rf read/write device, and controls the rf control module 220 to process the transmitted rf signal and transmit the processed rf signal to the rf tag through the rf antenna; the rf signal returned by the rf tag is processed by the rf control module 220 through the rf antenna and then sent to the digital control module 210. The digital control module 210 stores the read tag information to complete the write operation.
Optionally, the operating voltages of the digital control device 210 and the rf control device 220 may be different, and in order to reduce the power cost, that is, in order to make the digital control device 210 and the rf control device 220 share one power module, the rf read/write apparatus may further include a voltage conversion device 250.
The voltage conversion device 250 is configured to perform voltage conversion on the voltage provided by the power module 240, and provide the converted voltage for the rf control device 220 and the digital control device 210, respectively. The converted voltage is the operating voltage of the rf control device 220 or the digital control device 210.
It should be noted that the voltage conversion device is independently present in the rf read/write device; in order to reduce the occupied area of the device, the voltage conversion device may also be integrated in the digital control device 210 or the rf control device 220, and the embodiment of the invention is not limited herein.
Optionally, the rf read-write device may further include a terminal 260.
The terminal 260 may be connected to the digital control module 210 through a UART or USB connection, and connected to the external server 200 through a wireless network;
a terminal 260 for sending a read instruction to the digital control device 210 to trigger the digital control device 210;
and receiving the tag information sent by the digital control device 210 through the UART or USB, and displaying the tag information to the user, so that the user of the rf read/write device can check the information in time.
The terminal 260 may also transmit the tag information to the server through the wireless network to perform related information query, and feed the query information back to the terminal 260 in time to display the query information to the user.
Further, the terminal 260 may provide bluetooth remote communication for the rf reader/writer.
The Terminal may be a User Equipment (UE) such as a Mobile phone, a smart phone, a notebook computer, a digital broadcast receiver, a Personal Digital Assistant (PDA), a tablet computer (PAD), etc., a handheld device, a vehicle-mounted device, a wearable device, a computing device or other processing device connected to a wireless modem, a Mobile Station (MS), a Mobile Terminal ((Mobile Terminal), etc., where the Terminal has the capability of communicating with one or more core networks via a Radio Access Network (RAN).
As shown in fig. 3, the digital control device 210 may include a main control module 211, an analog-to-digital conversion module 212, and a security module 213;
the main control module 211 is configured to send a first digital signal to the security module 213 according to the received reading instruction, where the first digital signal is used to read tag information of the target radio frequency tag;
a security module 213, configured to encrypt the first digital signal and send the encrypted first digital signal to the analog-to-digital conversion module 212;
an analog-to-digital conversion module 212, configured to convert the encrypted first digital signal into a first radio frequency signal, and send the first radio frequency signal to the radio frequency control module 220; and converts the processed second radio frequency signal sent by the radio frequency control module 220 into a second digital signal, and transmits the second digital signal to the security module 213, where the second digital signal includes tag information of the target radio frequency tag. The first radio frequency signal and the processed second radio frequency signal are both differential signals;
the security module 213 is further configured to encrypt the second digital signal and send the encrypted second digital signal to the main control module 211.
The main control module 211 may be a processor, such as an M4 processor; the analog-to-digital conversion module 212 may be an analog-to-digital converter AD/DA; the security module 213 may be a cryptographic device, which is issued by a national security agency, such as a web shield or the like.
Optionally, the digital control device 210 may further include a Field-programmable gate Array (FPGA) 214 for performing the above-mentioned required logic functions.
The main control module 211 is connected to the FPGA 214, the analog-to-digital conversion module 212, and the security module 213.
As shown in fig. 4, the rf control device 220 is designed with discrete components, which may include a local oscillation modulation module 221, a transmission link module 222, a reception link module 223, a carrier cancellation module 224, and a demodulation module 225;
the local oscillator modulation module 221 is configured to perform first signal modulation on the first radio frequency signal to obtain a modulated first radio frequency signal; and performing second signal modulation on the demodulated second radio frequency signal obtained by the demodulation module 225 to obtain a processed second radio frequency signal, and sending the processed second radio frequency signal to the digital control device 210. The local oscillation modulation module 221 may be an ADF 9010.
The local oscillation modulation module 221 has a first input coupled to the digital control device 210 and a second input coupled to an output of the demodulation module 225.
A transmission link module 222, configured to perform power amplification and filtering processing on the modulated first radio frequency signal, and send the processed first radio frequency signal to a radio frequency antenna;
the transmit chain module 222 may include a Power Amplifier (PA) and a filter, wherein the filter includes a Surface Acoustic Wave (SAW) filter and a transmit filter. The input end of the SAW filter receives the modulated first radio frequency signal, the output end of the SAW filter is connected with the input end of the PA, and the output end of the PA is connected with the input end of the transmitting filter.
The SAW filter carries out primary filtering on the modulated first radio frequency signal, the PA carries out power amplification on the signal subjected to primary filtering, the transmitting filter carries out secondary filtering on the signal subjected to power amplification, and the transmitting filter sends the signal subjected to secondary filtering to the radio frequency antenna.
Optionally, in order to improve the directivity of the radio frequency signal, the transmit chain module 222 may further include several directional couplers. And the signal output by the output end of the transmitting filter is connected with the radio frequency antenna through the directional coupler.
The carrier cancellation module 223 is configured to combine the second radio frequency signal with a preset carrier cancellation signal to obtain a combined second radio frequency signal.
The carrier cancellation block 223 may include a vector adjuster, a Low Noise Amplifier (LNA), and a combiner.
The input end I and the input end Q of the vector regulator respectively receive the carrier cancellation signal I of the in-phase component and the carrier cancellation signal Q of the quadrature component, the output end of the vector regulator is connected with the input end of the LNA, and the LNA is used for amplifying the adjusted carrier cancellation signal.
The first input end of the combiner receives the second radio frequency signal, the second input end receives the amplified carrier cancellation signal to combine the second radio frequency signal with the preset carrier cancellation signal, and the output end inputs the combined second radio frequency signal to the receiving link module 224.
And the receiving link module 224 is configured to perform signal amplification and filtering processing on the combined second radio frequency signal, and obtain a half-processed second radio frequency signal.
The receive link module 224 includes a SAW filter and an LNA. The input of the SAW filter receives the combined second rf signal, and the output of the SAW filter is connected to the input of the LNA, which is connected to the input of the demodulation module 225.
The SAW filter is used for filtering the combined second radio frequency signal. The LNA amplifies the filtered combined second rf signal to obtain a half-processed second rf signal, and then sends the half-processed second rf signal to the demodulation module 225.
The demodulation module 225 is configured to use a preset differential conversion and quadrature demodulation technique to obtain the second demodulated rf signal from the half-processed second rf signal.
Since the differential signal has a strong common mode interference resistance, the demodulation module 225 includes a quadrature demodulator and a differential converter.
The input end of the differential converter receives the second radio-frequency signal which is processed in half, and two output ends of the differential converter are respectively connected with two input ends of the quadrature demodulator. The differential converter is used for performing preset differential conversion on the half-processed second radio frequency signal so as to convert the single-end half-processed second radio frequency signal into a differential half-processed second radio frequency signal.
The quadrature demodulator is configured to demodulate the differential half-processed second radio frequency signal to obtain a demodulated second radio frequency signal, where the demodulated second radio frequency signal is a differential signal. The quadrature demodulator transmits the demodulated second rf signal to two second input terminals of the local oscillation modulation module 221 through two output terminals of the quadrature demodulator.
It should be noted that, after the radio frequency read-write device is powered on, the security module in the digital control device performs instruction interaction with the main control module to complete the power-on authentication. After the power-on authentication is passed, the radio frequency read-write equipment enters a reading working state (or called reading working state). In addition, the configuration of the transmission power range, the frequency point range and the reception power range is performed on the radio frequency control module in advance. And the frequency point range is the frequency point range of the read target radio frequency tag.
Optionally, in order to improve the read-write accuracy and stability of the device, the rf control apparatus 220 may further include a power detection module 226.
The power detection module 226 is configured to detect whether the signal power of the processed first radio frequency signal is within a preset transmission power range, and detect whether the signal power of the combined second radio frequency signal is within a preset receiving power range.
The power detection module 226 may include a power detector and a directional coupler.
And in the process of transmitting radio-frequency signals by the radio-frequency reading and writing equipment, the input end of the directional coupler receives the signals subjected to secondary filtering, and the output end of the directional coupler is connected with the input end of the power detector.
If the signal power of the processed first radio-frequency signal is within the preset transmitting power range, the output end of the power detector outputs a first trigger signal so as to trigger the radio-frequency antenna to transmit the processed first radio-frequency signal to the radio-frequency tag;
if the signal power of the processed first rf signal is not within the preset transmit power range, the output end of the power detector outputs a calibration signal to calibrate the transmit power of the rf control device 220.
And in the process of receiving the radio-frequency signal by the radio-frequency read-write equipment, the input end of the directional coupler receives the combined second radio-frequency signal, and the output end of the directional coupler is connected with the input end of the power detector.
If the signal power of the combined second radio frequency signal is within the preset receiving power range, the output end of the power detector outputs a second trigger signal to trigger the receiving link module to work;
if the signal power of the combined second radio frequency signal is not within the preset receiving power range, the output end of the power detector outputs a third trigger signal to trigger the digital control device to read the radio frequency tag again.
Therefore, the radio frequency control device in the radio frequency read-write equipment adopts the design of discrete components to carry out carrier wave elimination, amplification, filtering, differential conversion and orthogonal demodulation processing on the radio frequency signals reflected by the radio frequency tags, so that the reading speed of the radio frequency read-write equipment is improved, and the stability of the working performance is ensured.
In one example, the rf read/write device shown in fig. 5 performs the following read operations:
the radio frequency read-write equipment is used for transmitting a radio frequency signal:
the M4 processor in the digital control device 210 sends the encrypted first digital signal to the analog-to-digital conversion module through the security module.
The analog-to-digital conversion module converts the encrypted first digital signal into a first radio frequency signal and sends the first radio frequency signal to the local oscillation modulation module.
The ADF9010 in the radio frequency control device 220 performs first modulation on the first radio frequency signal, and sends the modulated first radio frequency signal to the SAW filter in the transmit link module 222, and performs first filtering on the modulated first radio frequency signal, the SAW filter sends the signal after the first filtering to the PA, the PA performs power amplification on the signal after the first filtering, the transmit filter performs second filtering on the signal after the power amplification, and the transmit filter transmits the signal after the second filtering to the radio frequency tag through the radio frequency antenna via the three-stage directional coupler.
Wherein the directional coupler in the power detection module 226 sends the twice filtered signal to the power detector. When the power detector detects that the signal power of the signal subjected to the secondary filtering is within a preset transmitting power range, the power detector triggers the radio frequency antenna 230 to transmit the processed first radio frequency signal to the radio frequency tag; when the power detector detects that the signal power of the signal subjected to the secondary filtering is not within the preset transmitting power range, the power detector outputs a correction signal to correct the transmitting power of the radio frequency control device.
In the process of receiving radio frequency signals, the radio frequency read-write equipment:
the rf antenna 230 receives a second rf signal transmitted by the rf tag.
The vector adjuster in the carrier cancellation module 223 receives the carrier cancellation signal I of the in-phase component and the carrier cancellation signal Q of the quadrature component to obtain an adjusted carrier cancellation signal, and sends the carrier cancellation signal to the LNA, where the LNA is configured to amplify the adjusted carrier cancellation signal. The combiner combines the second rf signal and the amplified carrier cancellation signal to obtain a combined second rf signal, and sends the combined second rf signal to the receiving link module 224.
The directional coupler of the power detection module 226 receives the combined second rf signal and sends the combined second rf signal to the power detector. When the signal power of the combined second radio frequency signal is within the preset receiving power range, the power detector triggers the receiving link module 224 to operate, wherein the power detector can trigger the transceiving switch to be turned on, so as to trigger the receiving link module 224 to operate; when the signal power of the combined second radio frequency signal is not within the preset receiving power range, the power detector triggers the digital control device to read the radio frequency tag again.
The SAW filter in the receive link module 224 filters the received combined second rf signal, and sends the filtered signal to the LNA, and the LNA amplifies the filtered signal to obtain a half-processed second rf signal, and then sends the half-processed second rf signal to the demodulation module 225.
The differential converter in the demodulation module 225 performs preset differential conversion on the received half-processed second radio frequency signal to obtain a differential half-processed second radio frequency signal, and sends the differential half-processed second radio frequency signal to the quadrature demodulator. The quadrature demodulator demodulates the differential half-processed second radio frequency signal to obtain a demodulated second radio frequency signal, and transmits the demodulated second radio frequency signal to the ADF9010, the ADF9010 performs second signal modulation on the demodulated second radio frequency signal to obtain a processed second radio frequency signal, and transmits the processed second radio frequency signal to an analog-to-digital conversion module in the digital control device 210, the analog-to-digital conversion module performs analog-to-digital conversion on the demodulated second radio frequency signal to obtain a second digital signal, the security module encrypts the second digital signal and transmits the encrypted second digital signal to the main control module, and the main control module stores the encrypted second digital signal, that is, stores tag information in the second digital signal.
The radio frequency reading and writing equipment of the embodiment of the invention comprises a digital control device, a radio frequency antenna and a power supply module; the digital control device is used for sending a first radio frequency signal to the radio frequency control device according to the received reading instruction, wherein the first radio frequency signal is used for reading the label information of the target radio frequency label; the radio frequency control device is used for carrying out first preset signal processing on the first radio frequency signal and sending the processed first radio frequency signal to the radio frequency antenna; receiving a second radio frequency signal sent by the radio frequency antenna, wherein the second radio frequency signal comprises tag information of a target radio frequency tag; performing second preset signal processing on the second radio frequency signal, and sending the processed second radio frequency signal to the digital control device; the radio frequency antenna is used for transmitting the processed first radio frequency signal to a target radio frequency tag and receiving a second radio frequency signal transmitted by the target radio frequency tag; the power module supplies power for the digital control device and the radio frequency control device. Therefore, the design of the discrete components of the radio frequency control device in the radio frequency read-write equipment improves the reading speed of the radio frequency read-write equipment and ensures the stability of the performance of the equipment.
Corresponding to the above device, an embodiment of the present invention further provides a radio frequency read/write method, as shown in fig. 6, where the method may include:
step 610, transmitting a first radio frequency signal to a target radio frequency tag according to a received reading instruction, wherein the first radio frequency signal is used for reading tag information of the target radio frequency tag;
step 620, receiving a second radio frequency signal transmitted by the target radio frequency tag, wherein the second radio frequency signal comprises tag information of the target radio frequency tag;
in step 630, a second digital signal corresponding to the second rf signal is obtained.
The functions of the functional modules of the radio frequency read-write method provided by the above embodiment of the present invention can be implemented through the above method steps, and therefore, detailed working processes and beneficial effects of the modules of the radio frequency read-write method provided by the embodiment of the present invention are not repeated herein.
An embodiment of the present invention further provides an electronic device, as shown in fig. 7, including a processor 710, a communication interface 720, a memory 730, and a communication bus 740, where the processor 710, the communication interface 720, and the memory 730 complete mutual communication through the communication bus 740.
A memory 730 for storing a computer program;
the processor 710, when executing the program stored in the memory 730, implements the following steps:
transmitting a first radio frequency signal to a target radio frequency tag according to the received reading instruction, wherein the first radio frequency signal is used for reading tag information of the target radio frequency tag;
receiving a second radio frequency signal transmitted by the target radio frequency tag, wherein the second radio frequency signal comprises tag information of the target radio frequency tag;
and acquiring a second digital signal corresponding to the second radio frequency signal.
The aforementioned communication bus may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.
The communication interface is used for communication between the electronic equipment and other equipment.
The Memory may include a Random Access Memory (RAM) or a Non-Volatile Memory (NVM), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the processor.
The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component.
Since the implementation and the beneficial effects of the problem solving of each device of the electronic device in the above embodiment can be realized by referring to each step in the embodiment shown in fig. 6, detailed working processes and beneficial effects of the electronic device provided by the embodiment of the present invention are not described herein again.
In another embodiment of the present invention, a computer-readable storage medium is further provided, where instructions are stored in the computer-readable storage medium, and when the instructions are executed on a computer, the computer is caused to execute the radio frequency read-write method in any one of the above embodiments.
In another embodiment of the present invention, there is also provided a computer program product containing instructions, which when run on a computer, causes the computer to execute the rf reading and writing method according to any one of the above embodiments.
As will be appreciated by one of skill in the art, the embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, embodiments of 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, embodiments of 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.
Embodiments of the present application are 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.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the true scope of the embodiments of the present application.
It is apparent that those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the embodiments of the present application and their equivalents, the embodiments of the present application are also intended to include such modifications and variations.
Claims (11)
1. A radio frequency read-write device, characterized in that the device comprises: the device comprises a digital control device, a radio frequency antenna and a power supply module;
the digital control device is used for sending a first radio frequency signal to the radio frequency control device according to the received reading instruction, wherein the first radio frequency signal is used for reading the label information of the target radio frequency label;
the radio frequency control device is used for carrying out first preset signal processing on the first radio frequency signal and sending the processed first radio frequency signal to the radio frequency antenna; receiving a second radio frequency signal sent by the radio frequency antenna, wherein the second radio frequency signal comprises the tag information of the target radio frequency tag; performing second preset signal processing on the second radio frequency signal, and sending the processed second radio frequency signal to the digital control device;
the radio frequency antenna is used for transmitting the processed first radio frequency signal to the target radio frequency tag and receiving the second radio frequency signal transmitted by the target radio frequency tag;
and the power supply module is used for supplying power to the digital control device and the radio frequency control device.
2. The apparatus of claim 1, further comprising a voltage conversion device;
the voltage conversion device is used for performing voltage conversion on the voltage provided by the power supply module and respectively providing the converted voltage for the radio frequency control device and the digital control device.
3. The device of claim 1, wherein the device further comprises a terminal;
and the terminal is used for sending a reading instruction to the digital control device, displaying the label information of the target radio frequency label, and transmitting the label information to a server through a wireless network for information inquiry.
4. The apparatus of claim 1, wherein the digital control device is further configured to store the tag information.
5. The apparatus of claim 1, wherein the digital control device comprises a master control module, an analog-to-digital conversion module, and a security module;
the main control module is used for sending a first digital signal to the security module according to the received reading instruction, wherein the first digital signal is used for reading the label information of the target radio frequency label;
the security module is used for encrypting the first digital signal and sending the encrypted first digital signal to the analog-to-digital conversion module;
the analog-to-digital conversion module is used for converting the encrypted first digital signal into a first radio frequency signal and sending the first radio frequency signal to the radio frequency control module; converting the processed second radio frequency signal sent by the radio frequency control module into a second digital signal, and transmitting the second digital signal to the security module, wherein the second digital signal comprises the tag information of the target radio frequency tag;
the security module is further configured to encrypt the second digital signal and send the encrypted second digital signal to the main control module.
6. The apparatus of claim 1, wherein the radio frequency control device comprises a local oscillation modulation module, a transmission link module, a reception link module, a carrier cancellation module, and a demodulation module;
the local oscillator modulation module is used for performing first signal modulation on the first radio frequency signal to obtain a modulated first radio frequency signal; performing second signal modulation on the demodulated second radio frequency signal acquired by the demodulation module to obtain a processed second radio frequency signal, and sending the processed second radio frequency signal to the digital control device;
the transmitting link module is used for performing power amplification and filtering processing on the modulated first radio frequency signal and sending the processed first radio frequency signal to the radio frequency antenna;
the carrier cancellation module is configured to combine the second radio frequency signal with a preset carrier cancellation signal to obtain a combined second radio frequency signal;
the receiving link module is used for performing signal amplification and filtering processing on the combined second radio frequency signal to obtain a semi-processed second radio frequency signal;
and the demodulation module is used for acquiring the demodulated second radio frequency signal by adopting a preset differential conversion and orthogonal demodulation technology on the semi-processed second radio frequency signal.
7. The apparatus of claim 6, wherein the radio frequency control means further comprises a power detection module;
a power detection module, configured to detect whether a signal power of the processed first radio frequency signal is within a preset transmit power range, and detect whether a signal power of the combined second radio frequency signal is within a preset receive power range;
when the signal power of the processed first radio-frequency signal is within the preset transmitting power range, triggering the radio-frequency antenna to transmit the processed first radio-frequency signal to the radio-frequency tag;
and triggering the receiving link module when the signal power of the combined second radio frequency signal is within a preset receiving power range.
8. The device of claim 6, wherein the transmit chain module comprises a power amplifier, a first filter, and a second filter; the carrier wave elimination module comprises a vector regulator, a first low noise amplifier and a combiner; the receive chain module comprises a second low noise amplifier and the third filter; the demodulation module comprises a quadrature demodulator and a differential converter;
the first filter is used for filtering the modulated first radio frequency signal for the first time;
the power amplifier is configured to perform power amplification on the first modulated radio-frequency signal after the primary filtering;
the second filter is configured to perform secondary filtering on the primary-filtered modulated first radio frequency signal;
the vector adjuster is used for receiving the carrier cancellation signal of the in-phase component and the carrier cancellation signal of the orthogonal component to obtain an adjusted carrier cancellation signal and sending the carrier cancellation signal to the first low noise amplifier;
the first low noise amplifier is used for amplifying the carrier cancellation signal to obtain an amplified carrier cancellation signal;
the combiner is used for combining the second radio frequency signal and the amplified carrier cancellation signal to obtain a combined second radio frequency signal;
the third filter is configured to filter the combined second radio frequency signal and send the filtered combined second radio frequency signal to the second low noise amplifier;
the second low noise amplifier is configured to perform signal amplification on the filtered combined second radio frequency signal to obtain a semi-processed second radio frequency signal;
the differential converter is used for performing preset differential conversion on the semi-processed second radio frequency signal to obtain a differential semi-processed second radio frequency signal and sending the differential semi-processed second radio frequency signal to the orthogonal demodulator;
the quadrature demodulator is configured to demodulate the differential half-processed second radio frequency signal to obtain a demodulated second radio frequency signal.
9. A radio frequency read-write method, characterized in that the method comprises:
transmitting a first radio frequency signal to a target radio frequency tag according to a received reading instruction, wherein the first radio frequency signal is used for reading tag information of the target radio frequency tag;
receiving a second radio frequency signal transmitted by the target radio frequency tag, wherein the second radio frequency signal comprises tag information of the target radio frequency tag;
and acquiring a second digital signal corresponding to the second radio frequency signal.
10. A radio frequency read-write system, characterized in that the device comprises: the radio frequency read-write equipment is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory complete mutual communication through the communication bus;
a memory for storing a computer program;
a processor for implementing the method steps of claim 9 when executing a program stored on a memory.
11. A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, which computer program, when being executed by a processor, carries out the method steps of claim 9.
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| CN201811408182.0A CN111222351A (en) | 2018-11-23 | 2018-11-23 | Radio frequency read-write equipment and radio frequency read-write method |
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