Ultra-high frequency RFID reader, system, method, device and storage medium

Abstract

The present application provides an ultra-high frequency RFID reader, system, method, device and storage medium, through a transmitting module, a coupling module, an antenna module, a control module, a receiving module, an interface module, and a power module; the transmitting module includes: a voltage-controlled oscillator, a first power divider, and a radio frequency power amplifier; the receiving module includes: a phase shift circuit, a mixer, an intermediate frequency filter, and an intermediate frequency amplifier; the control module is electrically connected to the mixer, and is used to control the mixer to select a local oscillator signal processed with different phase shifts; the phase shift circuit is electrically connected to the first power divider and the mixer, respectively. The present application can greatly reduce the noise component in the output intermediate frequency signal, and effectively improve the demodulation capability and reading and writing distance of the reader.

Description

Technical Field

[0001] The present application relates to the field of radio frequency identification reading and writing technology, and in particular to an ultra-high frequency RFID reader / writer, system, method, device and storage medium. Background Art

[0002] At present, passive RFID tags are mainly powered by the radio frequency signal emitted by the reader and send out the information stored in the chip. If the signal returned by the tag is orthogonal to the carrier signal, it will be converted into an intermediate frequency signal with almost no noise after mixing. However, in reality, the position of the tag from the reader is not fixed, so the signal returned by the tag is not necessarily orthogonal to the carrier signal when entering the mixer. Specifically, it can be said that it is not orthogonal most of the time, which will cause the intermediate frequency signal output by the mixer to have a noise component.

[0003] Since this part of the noise component is very close to the useful signal, the intermediate frequency filter has almost no effect on it, and the intermediate frequency amplifier will amplify the noise component together with the useful signal and send it to the controller MCU. If the noise component is too large, it will cause the controller MCU to make errors in judgment, or even fail to judge the useful signal, which will affect the effect and distance of the reader reading and writing tags. Summary of the invention

[0004] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present application is to provide an ultra-high frequency RFID reader / writer, system, method, device and storage medium, which are used to solve the problem of noise components in the intermediate frequency signal output during the RFID reading and writing process in the prior art.

[0005] To achieve the above-mentioned purpose and other related purposes, the present application provides an ultra-high frequency RFID reading and writing system, including: a transmitting module, a coupling module, an antenna module, a control module, a receiving module, an interface module, and a power module; the transmitting module includes: a voltage-controlled oscillator, a first power divider, and a power amplifier; the receiving module includes: a phase shift circuit, a mixer, an intermediate frequency filter, and an intermediate frequency amplifier; the control module is electrically connected to the mixer, and is used to control the mixer to select a local oscillator signal processed with different phase shifts; the phase shift circuit is electrically connected to the first power divider and the mixer, respectively.

[0006] In one embodiment of the present application, the phase shifting circuit includes: a second power divider, a first phase shifter, and a second phase shifter; the input end of the second power divider is electrically connected to the output end of the first power divider; the input ends of the first phase shifter and the second phase shifter are respectively electrically connected to the output end of the second power divider; the output ends of the first phase shifter and the second phase shifter are respectively electrically connected to the input end of the mixer.

[0007] In an embodiment of the present application, the phase shift angle parameter values ​​of the first phase shifter and the second phase shifter are preset to differ by 90°.

[0008] In one embodiment of the present application, the control module controls the local oscillator input switch of the mixer to connect the phase shifter corresponding to the smaller noise by comparing the noise levels of the first signal phase-shifted by the first phase shifter and the second signal phase-shifted by the second phase shifter.

[0009] In an embodiment of the present application, the control module adjusts the phase shift angle parameter value of the first phase shifter or the second phase shifter accordingly according to the Gaussian distribution of the noise in the first signal or the second signal each time.

[0010] In an embodiment of the present application, the control module adjusts the phase shift angle parameter value of the first phase shifter or the second phase shifter accordingly by changing the voltage value of the input voltage.

[0011] In one embodiment of the present application, the first phase shifter and the second phase shifter are load line phase shifters, and the load line phase shifter includes: a first inductor, a second inductor, and a capacitor; one end of the first inductor is an input end; the other end of the first inductor is electrically connected to one end of the second inductor and one end of the capacitor respectively; the other end of the second inductor is an output end; and the other end of the capacitor is grounded.

[0012] To achieve the above-mentioned purpose and other related purposes, the present application provides an ultra-high frequency RFID reader / writer, including the ultra-high frequency RFID reading / writing system as described above.

[0013] To achieve the above-mentioned purpose and other related purposes, the present application provides an ultra-high frequency RFID reading and writing method, which is applied to an ultra-high frequency RFID reading and writing system including a first phase shifter, a second phase shifter, and a mixer. The method includes: obtaining a first signal processed by the first phase shifter through phase shifting, and a second signal processed by the second phase shifter through phase shifting; comparing the noise levels of the first signal and the second signal to control the mixer to select the phase shifter corresponding to the smaller noise; and / or adjusting the output voltage according to the Gaussian distribution of the noise of the first signal or the second signal to allow the phase shifter to adjust the corresponding phase shift angle parameter value.

[0014] To achieve the above-mentioned purpose and other related purposes, the present application provides an ultra-high frequency RFID reading and writing device, which includes: an acquisition unit, used to acquire a first signal processed by phase shifting of the first phase shifter, and a second signal processed by phase shifting of the second phase shifter; a processing unit, used to compare the noise level of the first signal and the second signal, so as to control the mixer to select the phase shifter corresponding to the smaller noise; and / or, adjust the output voltage according to the Gaussian distribution of the noise of the first signal or the second signal, so as to make the phase shifter adjust the corresponding phase shift angle parameter value.

[0015] To achieve the above-mentioned purpose and other related purposes, the present application provides an ultra-high frequency RFID reading and writing device, which includes: a memory, a processor, and a communicator; the memory stores a computer program, the processor executes the computer program to implement the ultra-high frequency RFID reading and writing method as described above; the communicator is connected to an external device for communication.

[0016] To achieve the above-mentioned purpose and other related purposes, the present application provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the ultra-high frequency RFID reading and writing method as described above is implemented.

[0017] As described above, the present application provides an ultra-high frequency RFID reader, system, method, device and storage medium. By acquiring a first signal processed by the first phase shifter and a second signal processed by the second phase shifter, the noise levels of the first signal and the second signal are compared to control the mixer to select the phase shifter corresponding to the smaller noise; and / or adjust the output voltage according to the Gaussian distribution of the noise of the first signal or the second signal, so as to make the phase shifter adjust the corresponding phase shift angle parameter value.

[0018] The following beneficial effects were achieved:

[0019] It can greatly reduce the noise component in the output intermediate frequency signal and effectively improve the demodulation capability and reading and writing distance of the reader. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of an ultra-high frequency RFID reading and writing system in one embodiment of the present application.

[0021] Figure 2 FIG. 4 is a circuit diagram of a load line phase shifter according to an embodiment of the present application.

[0022] Figure 3 Schematic diagram of a flow chart of an ultra-high frequency RFID reading and writing method in one embodiment of the present application.

[0023] Figure 4This is a module diagram of an ultra-high frequency RFID reading and writing device in one embodiment of the present application.

[0024] Figure 5 This is a schematic diagram of the structure of an ultra-high frequency RFID reading and writing device in one embodiment of the present application. DETAILED DESCRIPTION

[0025] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0026] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application, and thus the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0027] Radio Frequency Identification (RFID) is a wireless communication technology that uses the spatial coupling of radio frequency signals to identify targets and obtain target data. The most important advantage of RFID technology is non-contact recognition. It can read labels in harsh environments such as snow, fog, ice, paint, and dirt where barcodes cannot be used. It can also identify multiple labels at the same time. The label itself has the advantages of small size, diverse shapes, strong anti-pollution ability, reusability, large data memory capacity, and encryption. With the development of RFID technology, its application fields are becoming more and more extensive, such as food safety traceability, book borrowing and returning systems, access control systems, warehouse management, parking management systems, traffic monitoring management, and many other fields. Some experts have pointed out that RFID technology may become another new technology that affects the global economy and life after mobile communication technology and Internet technology.

[0028] RFID electronic tags are divided into three types according to the different ways of obtaining energy sources: active, passive, semi-active and semi-passive. Active electronic tags are also called active tags. The working power of the tag is completely supplied by the internal battery. At the same time, the radio frequency energy required for the electronic tag to communicate with the reader is also provided by the battery. The tag has a long reading / writing distance, a large, thick and heavy appearance, high cost, limited application field, and the battery cannot be used for a long time. The battery needs to be replaced after the energy is exhausted. Semi-active electronic tags are also called semi-active tags. The battery only supplies power to the circuit that maintains the data in the tag. Before the tag enters the working state, it is in a dormant state, which is equivalent to a passive tag. When the tag enters the reading area of ​​the reader, it is stimulated by the radio frequency signal emitted by the reader and enters the working state. The advantages and disadvantages of the tag are basically the same as those of the active tag. Passive electronic tags are also called passive tags. There is no built-in battery. The tag converts part of the energy from the radio frequency energy emitted by the reader into the power required for its operation. The tag has a small appearance, light, thin, easy installation, low cost and a long service life. It is suitable for various occasions and can be maintenance-free.

[0029] In addition, compared with high frequency 13.56MHz and low frequency 125KHz, ultra-high frequency RFID (international standard ISO18000-6C stipulates an operating frequency band of 860-960MHz) has a shorter operating wavelength, small and flexible antenna size, and flexible application. Therefore, ultra-high frequency passive tags and readers have become the key development direction of the Internet of Things in recent years.

[0030] like Figure 1 , which shows a schematic diagram of the structure of an ultra-high frequency RFID reading and writing system in one embodiment of the present application. As shown in the figure, the ultra-high frequency RFID reading and writing system 100 includes: a transmitting module 110, a coupling module 120, an antenna module 130, a control module 140, a receiving module 150, an interface module 160, and a power module 170.

[0031] The transmitting module 110 is electrically connected to the coupling module 120, and the coupling module 120 is electrically connected to the antenna module 130; the transmitting module 110 and the coupling module 120 are also electrically connected to the receiving module 150 respectively; the receiving module 150 and the interface module 160 are electrically connected to the control module 140 respectively. In addition, the power supply module 170 is also electrically connected to each module to provide power. It should be noted that Figure 1 For the sake of simplicity, the schematic diagram of the electrical connection between the power module 170 and each module is not drawn, but it should be understood here.

[0032] In one embodiment of the present application, the transmitting module 110 includes: a voltage controlled oscillator 111, a first power divider 112, and a power amplifier 113. Figure 1It can be seen that the input end of the voltage-controlled oscillator 111 is electrically connected to one end of the control module 140, and its output end is electrically connected to the input end of the first power divider 112, and the output end of the first power divider 112 is electrically connected to the power amplifier 113 and the second power divider 155 respectively.

[0033] In this embodiment, the voltage controlled oscillator 111 is mainly used to provide an oscillation signal, namely, the local oscillator signal described in this application; the first power divider 112 is mainly used to distribute power, and has one input and two outputs; and the power amplifier 113 is mainly used to amplify power.

[0034] Generally speaking, a voltage-controlled oscillator refers to an oscillation circuit (VCO) whose output frequency corresponds to an input control voltage. The frequency of an oscillator VCO is a function of the input signal voltage. The operating state of the oscillator or the component parameters of the oscillation circuit are controlled by the input control voltage, which constitutes a voltage-controlled oscillator.

[0035] The full name of power divider is power divider. It is a device that divides the energy of one input signal into two or more outputs with equal or unequal energy. It can also combine the energy of multiple signals into one output. In this case, it can also be called a combiner. A certain degree of isolation should be guaranteed between the output ports of a power divider. Power dividers are usually divided into one-to-two (one input and two outputs) and one-to-three (one input and three outputs) according to the output. The main technical parameters of the power divider include power loss (including insertion loss, distribution loss and reflection loss), voltage standing wave ratio of each port, isolation between power distribution ports, amplitude balance, phase balance, power capacity and bandwidth, etc.

[0036] A power amplifier (English name: power amplifier), referred to as "power amplifier", refers to an amplifier that can generate maximum power output to drive a load (such as a speaker) under given distortion conditions. The power amplifier plays a pivotal role in "organization and coordination" in the entire audio system, and to some extent dominates whether the entire system can provide good sound quality output.

[0037] In this embodiment, the voltage-controlled oscillator 111, the first power divider 112, and the power amplifier 113 are all common types of devices in the prior art, without special design or requirements, that is, any type of voltage-controlled oscillator or power divider or power amplifier is covered within the scope of this application.

[0038] The antenna module 130 is mainly used to radiate and receive radio waves, and the coupling module 120 is preferably a directional coupler, which is used to stabilize the external signal carrier received by the antenna module 130 .

[0039] The directional coupler is a universal microwave / millimeter wave component that can be used for signal isolation, separation and mixing, such as power monitoring, source output power stabilization, signal source isolation, transmission and reflection sweep frequency testing, etc. The main technical indicators are directivity, standing wave ratio, coupling degree, and insertion loss.

[0040] In one embodiment of the present application, the receiving module 150 includes: a phase shift circuit 151, a mixer 152, an intermediate frequency filter 153, and an intermediate frequency amplifier 154. The phase shift circuit 151 is electrically connected to the first power divider 112 and the mixer 152 respectively.

[0041] In this embodiment, the intermediate frequency filter 153 and the intermediate frequency amplifier 154 are mainly used to process the intermediate frequency signal in the carrier signal. The mixer 152 is mainly used to mix the frequencies of the signals from the transmitting module 110 and the coupling module 120.

[0042] Specifically, the frequency of the output signal of the mixer 152 is equal to the sum, difference or other combination of the frequencies of the two input signals. In the prior art, the mixer is usually composed of nonlinear elements and a frequency selection circuit. The mixer is located after the low noise amplifier (LNA) and directly processes the RF signal amplified by the LNA. In order to realize the mixing function, the mixer also needs to receive the local oscillator (LO) signal from the voltage-controlled oscillator, and its circuit operates completely in the RF frequency band.

[0043] In one embodiment of the present application, the phase shift circuit 151 includes: a second power divider 155, a first phase shifter 156, and a second phase shifter 157; the input end of the second power divider 155 is electrically connected to the output end of the first power divider 112; the input ends of the first phase shifter 156 and the second phase shifter 157 are respectively electrically connected to the output end of the second power divider 155; the output ends of the first phase shifter 156 and the second phase shifter 157 are respectively electrically connected to the input end of the mixer 152.

[0044] Generally speaking, a phase shifter is a device that can adjust the phase of a wave. A general phase shifter circuit is composed of resistors, reactance elements, nonlinear elements, and active devices. When a sinusoidal signal passes through a phase shifter, its phase changes. When adjusting the circuit parameters, an ideal phase shifter can continuously change the phase of the passing signal between 0° and 360° without changing the amplitude of the signal, that is, the signal can pass without distortion, but the phase changes.

[0045] In one embodiment of the present application, the first phase shifter 156 and the second phase shifter 157 are load line phase shifters. Figure 2The load line phase shifter in the figure includes: a first inductor, a second inductor, and a capacitor; one end of the first inductor is an input end; the other end of the first inductor is electrically connected to one end of the second inductor and one end of the capacitor respectively; the other end of the second inductor is an output end; the other end of the capacitor is grounded.

[0046] In one embodiment of the present application, the control module 140 is electrically connected to the mixer 152 and is used to control the mixer 152 to select the local oscillator signal processed with different phase shifts;

[0047] Specifically, the control module 140 controls the local oscillator input switch of the mixer 152 to connect the phase shifter corresponding to the smaller noise by comparing the noise levels of the first signal phase-shifted by the first phase shifter 156 and the second signal phase-shifted by the second phase shifter 157 .

[0048] It should be noted that when applying the ultra-high frequency passive RFID technology scenario, when the signal returned by the RFID tag enters the mixer 152, if the noise signal and the carrier signal are orthogonal (i.e. 90°), the noise component in the intermediate frequency signal output by the mixer 152 is the smallest.

[0049] Based on this, an embodiment of the control module 140 for controlling the mixer 152 to select the local oscillator signal processed with different phase shifts is: the phase shift angle parameter values ​​of the first phase shifter 156 and the second phase shifter 157 are preset to differ by 90°.

[0050] In this embodiment, the phase shift angle parameter values ​​of the first phase shifter 156 and the second phase shifter 157 are preset, and can be set multiple times according to the actual output effect, that is, multiple presets can be performed manually.

[0051] For example, assuming that the phase shift angle of the first phase shifter 156 is set to 30°, and the corresponding phase shift angle of the second phase shifter 157 is set to 60° (which is 90° different from the phase shift angle of the first phase shifter 156). Then, after the carrier signal is phase-shifted by the first phase shifter 156 and the second phase shifter 157, both carrier signals have an intersection angle with the noise signal. If the intersection angle is larger, the noise component is larger. Since the phase shift angles of the two phase shifters are kept 90° different, most of the time, one intersection angle is smaller and the other intersection angle is larger. Of course, there is also a very small probability that the two intersection angles are the same. From the above, the control module 140 can select the phase shifter corresponding to the smaller noise to be connected by controlling the local oscillator input switch of the mixer 152.

[0052] Another embodiment of the method corresponding to the control module 140 for controlling the mixer 152 to select the local oscillator signal that has been processed with different phase shifts is: the control module 140 adjusts the phase shift angle parameter value of the first phase shifter 156 or the second phase shifter 157 accordingly according to the Gaussian distribution of the noise in the first signal or the second signal each time.

[0053] Specifically, the control module 140 adjusts the phase shift angle parameter value of the first phase shifter 156 or the second phase shifter 157 accordingly by changing the voltage value of the input voltage.

[0054] For example, according to the Gaussian distribution of noise, it can be understood that when the noise is at its maximum value, it is the highest value in the middle of the Gaussian distribution diagram, and accordingly, the noise value decreases one by one toward both sides. Therefore, according to the Gaussian distribution of noise, it can be used as a guide for adjusting the angle. For example, when the noise value is the maximum, the corresponding adjusted phase shift angle is 90°. Specifically speaking of the control module 140, the input voltage is first divided into a plurality of intervals to correspond to different adjustment angles. For example, an increase of 1 to 1.5 V will correspondingly adjust the phase shifter by 5 to 10°, etc., so that the input voltage can be adjusted through the control module 140 to achieve the purpose of correspondingly adjusting the phase shift angle parameter value of the first phase shifter 156 or the second phase shifter 157.

[0055] For the latter embodiment, the cost of its implementation is higher than that of the former embodiment because of the higher processing requirements for the control module 140. However, the output signals obtained by the above two embodiments can greatly reduce the noise component in the output intermediate frequency signal, effectively improving the demodulation capability and reading and writing distance of the reader.

[0056] In this embodiment, the control module 140 can be a microcontroller unit (MCU), a single chip microcomputer or a single chip microcomputer, or a single core microprocessor or a multi-core microprocessor. The control module 140 can also be a general processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.

[0057] The interface module 106 is electrically connected to the control module 150 and is used to connect to external devices or other communication devices. For example, common industrial equipment interfaces include: RJ45 interface, SC optical fiber interface, FDDI interface, AUI interface, BNC interface, and Console interface.

[0058] It should be noted that it should be understood that the division of the modules in the above-mentioned UHF RFID reading and writing system 100 is only a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or physically separated. Moreover, these modules can be all implemented in the form of software calling through processing elements; they can also be all implemented in the form of hardware; some units can also be implemented in the form of software calling through processing elements, and some units can be implemented in the form of hardware.

[0059] In one embodiment of the present application, the present application also provides an ultra-high frequency RFID reader / writer, the reader / writer includes: Figure 1 The ultra-high frequency RFID reading and writing system.

[0060] like Figure 3 As shown, a flow chart of a protocol conversion method in an embodiment of the present application is shown. As shown in the figure, the method is applied to an ultra-high frequency RFID reading and writing system including a first phase shifter, a second phase shifter, and a mixer, and the method includes:

[0061] Step S301: acquiring a first signal processed by the first phase shifter through phase shifting, and a second signal processed by the second phase shifter through phase shifting.

[0062] Step S302: Compare the noise levels of the first signal and the second signal to control the mixer to select the phase shifter corresponding to the smaller noise; and / or adjust the output voltage according to the Gaussian distribution of the noise of the first signal or the second signal to make the phase shifter adjust the corresponding phase shift angle parameter value.

[0063] For example, assuming that the phase shift angle of the first phase shifter is set to 30°, and the corresponding phase shift angle of the second phase shifter is set to 60° (90° different from the phase shift angle of the first phase shifter). Then, after the carrier signal is phase-shifted by the first phase shifter 156 and the second phase shifter 157, the carrier signals of both have an intersection angle with the noise signal. If the intersection angle is larger, the noise component will be larger. Since the phase shift angles of the two phase shifters are kept 90° different, most of the time, one intersection angle will be smaller and the other intersection angle will be larger. Of course, there is also a very small probability that the two intersection angles are the same. From the above, the phase shifter corresponding to the smaller noise can be selected by controlling the local oscillator input switch of the mixer.

[0064] For another example, according to the Gaussian distribution of noise, it can be understood that when the noise is at its maximum value, it is the highest value in the middle of the Gaussian distribution diagram, and accordingly, the noise value decreases one by one to both sides. Therefore, according to the Gaussian distribution of noise, it can be used as a guide for adjusting the angle. For example, when the noise value is the maximum, the corresponding adjusted phase shift angle is 90°. Then, first divide the input voltage into multiple intervals to correspond to different adjustment angles. For example, an increase of 1 to 1.5V will correspondingly adjust the phase shifter by 5 to 10°, etc., so that the purpose of adjusting the phase shift angle parameter value of the first phase shifter or the second phase shifter can be achieved by adjusting the input voltage.

[0065] like Figure 4 , which shows a module schematic diagram of an ultra-high frequency RFID reading and writing device in an embodiment of the present application. As shown in the figure, the device 400 includes: an acquisition unit 401 and a processing unit 402.

[0066] The acquisition unit 401 is used to acquire the first signal processed by the first phase shifter and the second signal processed by the second phase shifter;

[0067] The processing unit 402 is used to compare the noise levels of the first signal and the second signal to control the mixer to select the phase shifter corresponding to the smaller noise; and / or adjust the output voltage according to the Gaussian distribution of the noise of the first signal or the second signal to make the phase shifter adjust the corresponding phase shift angle parameter value.

[0068] It is understandable that the UHF RFID reader / writer 400 can achieve the following through the operation of each unit: Figure 3The UHF RFID reading and writing method.

[0069] It should be noted that it should be understood that the division of the various units of the above device is only a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. And these units can all be implemented in the form of software called by processing elements; they can also be all implemented in the form of hardware; some units can also be implemented in the form of software called by processing elements, and some units can be implemented in the form of hardware. For example, the processing unit 402 can be a separately established processing element, or it can be integrated in a chip of the above device. In addition, it can also be stored in the memory of the above device in the form of program code, and called and executed by a processing element of the above device. The function of the above processing unit 402. The implementation of other units is similar. In addition, all or part of these units can be integrated together, or they can be implemented independently. The processing element described here can be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each unit above can be completed by an integrated logic circuit of hardware in the processor element or instructions in the form of software.

[0070] For example, the above units may be one or more integrated circuits configured to implement the above methods, such as one or more application specific integrated circuits (ASICs), or one or more digital signal processors (DSPs), or one or more field programmable gate arrays (FPGAs). For another example, when a certain unit above is implemented in the form of a processing element scheduling program code, the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processors that can call program code. For another example, these units may be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0071] like Figure 5 As shown, a schematic diagram of the structure of an ultra-high frequency RFID reader / writer in an embodiment of the present application is shown. As shown in the figure, the protocol conversion device 500 includes: a memory 501, a processor 502, and a communicator 503. The memory 501 stores a computer program, and the processor 502 executes the computer program to implement the following Figure 3 The UHF RFID reading and writing method; the communicator 503 is connected to an external device for communication.

[0072] The memory 501 may include a random access memory (RAM), and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0073] The processor 502 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, and discrete hardware components.

[0074] The communicator 503 is used to realize the communication connection between other devices (such as clients, controllers, read-write libraries and read-only libraries). It may include one or more modules of different communication modes. The communication connection may be one or more wired / wireless communication modes and combinations thereof. The communication modes include: any one or more of the Internet, CAN, intranet, wide area network (WAN), local area network (LAN), wireless network, digital subscriber line (DSL) network, frame relay network, asynchronous transfer mode (ATM) network, virtual private network (VPN) and / or any other suitable communication network. For example: any one or more of WIFI, Bluetooth, NFC, GPRS, GSM, and Ethernet.

[0075] In one embodiment of the present application, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the following Figure 3 The UHF RFID reading and writing method.

[0076] The computer-readable storage medium, as can be understood by ordinary technicians in this field, can be implemented by hardware related to the computer program. The aforementioned computer program can be stored in a computer-readable storage medium. When the program is executed, it executes the embodiments including the aforementioned system and the functions of each unit; and the aforementioned storage medium includes: ROM, RAM, disk or optical disk and other media that can store program codes.

[0077] In summary, the present application provides an ultra-high frequency RFID reader, system, method, device and storage medium. By acquiring a first signal processed by the first phase shifter and a second signal processed by the second phase shifter, the noise levels of the first signal and the second signal are compared to control the mixer to select the phase shifter corresponding to the smaller noise; and / or adjust the output voltage according to the Gaussian distribution of the noise of the first signal or the second signal, so as to make the phase shifter adjust the corresponding phase shift angle parameter value.

[0078] The present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0079] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. An ultra-high frequency RFID reading and writing system, characterized in that: include: Transmitting module, coupling module, antenna module, control module, receiving module, interface module, and power module; The transmitting module includes: a voltage-controlled oscillator, a first power divider, and a radio frequency power amplifier; The receiving module includes: a phase shift circuit, a mixer, an intermediate frequency filter, and an intermediate frequency amplifier; The control module is electrically connected to the mixer and is used to control the mixer to select local oscillator signals that have undergone different phase shifting processes; The phase shift circuit is electrically connected to the first power divider and the mixer respectively; The phase shift circuit includes: a second power divider, a first phase shifter, and a second phase shifter; the input end of the second power divider is electrically connected to the output end of the first power divider; the input ends of the first phase shifter and the second phase shifter are respectively electrically connected to the output end of the second power divider; the output ends of the first phase shifter and the second phase shifter are respectively electrically connected to the input end of the mixer.

2. The UHF RFID reading and writing system according to claim 1, characterized in that: The phase shift angle parameter values ​​of the first phase shifter and the second phase shifter are preset to differ by 90°.

3. The UHF RFID reading and writing system according to claim 1, characterized in that: The control module controls the local oscillator input switch of the mixer to connect the phase shifter corresponding to the smaller noise by comparing the noise levels of the first signal phase-shifted by the first phase shifter and the second signal phase-shifted by the second phase shifter.

4. The UHF RFID reading and writing system according to claim 3, characterized in that: The control module adjusts the phase shift angle parameter value of the first phase shifter or the second phase shifter accordingly according to the Gaussian distribution of the noise in the first signal or the second signal each time.

5. The UHF RFID reading and writing system according to claim 4, characterized in that: The control module adjusts the phase shift angle parameter value of the first phase shifter or the second phase shifter accordingly by changing the voltage value of the input voltage.

6. The UHF RFID reading and writing system according to claim 1, characterized in that: The first phase shifter and the second phase shifter are load line phase shifters, and the load line phase shifter includes: a first inductor, a second inductor, and a capacitor; one end of the first inductor is an input end; the other end of the first inductor is electrically connected to one end of the second inductor and one end of the capacitor respectively; the other end of the second inductor is an output end; the other end of the capacitor is grounded.

7. An ultra-high frequency RFID reader / writer, characterized in that: An ultra-high frequency RFID reading and writing system comprising any one of claims 1-6.

8. A UHF RFID reading and writing method, characterized in that: Applicable to an ultra-high frequency RFID reading and writing system including a first phase shifter, a second phase shifter, and a mixer, the method comprising: Acquire a first signal processed by the first phase shifter through phase shifting, and a second signal processed by the second phase shifter through phase shifting; Compare the noise levels of the first signal and the second signal to control the mixer to select the phase shifter corresponding to the smaller noise; and / or adjust the output voltage according to the Gaussian distribution of the noise of the first signal or the second signal to make the phase shifter adjust the corresponding phase shift angle parameter value.

9. An ultra-high frequency RFID reader / writer, characterized in that: Applicable to an ultra-high frequency RFID reading and writing system including a first phase shifter, a second phase shifter, and a mixer, the device comprising: an acquisition unit, configured to acquire a first signal processed by the first phase shifter through phase shifting, and a second signal processed by the second phase shifter through phase shifting; A processing unit is used to compare the noise levels of the first signal and the second signal to control the mixer to select the phase shifter corresponding to the smaller noise; and / or adjust the output voltage according to the Gaussian distribution of the noise of the first signal or the second signal to make the phase shifter adjust the corresponding phase shift angle parameter value.

10. An ultra-high frequency RFID reading and writing device, characterized in that: The device comprises: a memory, a processor, and a communicator; The memory stores a computer program, and the processor executes the computer program to implement the ultra-high frequency RFID reading and writing method as claimed in claim 8; the communicator is connected to an external device for communication.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the ultra-high frequency RFID reading and writing method as claimed in claim 8 is implemented.

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