CN111753561B - Ultra-high frequency RFID reader, system, method, device and storage medium - Google Patents

Abstract

The application provides an ultrahigh frequency RFID reader-writer, a system, a method, a device and a storage medium, wherein the ultrahigh frequency RFID reader-writer comprises a transmitting module, a coupling module, an antenna module, a control module, a receiving module, an interface module and a power supply module, the transmitting module comprises a voltage-controlled oscillator, a first power divider and a radio frequency power amplifier, the receiving module comprises a phase shifting circuit, a mixer, an intermediate frequency filter and an intermediate frequency amplifier, the control module is electrically connected with the mixer and is used for controlling the mixer to select local oscillation signals subjected to different phase shifting processes, and the phase shifting circuit is electrically connected with the first power divider and the mixer respectively. The application can greatly reduce the noise component in the output intermediate frequency signal and effectively improve the demodulation capability and the read-write distance of the reader-writer.

Description

Ultrahigh frequency RFID reader-writer, system, method, device and storage medium

Technical Field

The application relates to the technical field of radio frequency identification read-write, in particular to an ultrahigh frequency RFID read-write device, a system, a method, a device and a storage medium.

Background

At present, a passive RFID tag mainly depends on a radio frequency signal emitted by a reader-writer to supply power and send information stored in a chip, if the signal returned by the tag is orthogonal to a carrier signal, the signal is converted into an intermediate frequency signal almost free of noise after mixing, but in practice, the position of the tag away from the reader-writer is not fixed, so that the signal returned by the tag is not necessarily orthogonal to the carrier signal when entering the mixer, in particular, the signal is not orthogonal most of the time, which causes the intermediate frequency signal output by the mixer to have a noise component,

The noise component of the part is very close to the useful signal, the intermediate frequency filtering hardly acts on the useful signal, the intermediate frequency amplifier amplifies the noise component and the useful signal together and sends the amplified noise component and the useful signal into the controller MCU, and the excessive noise component can cause the controller MCU to judge that the error occurs, even the useful signal can not be judged, and then the effect and the distance of reading and writing the label of the reader-writer can be influenced.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present application is to provide an ultrahigh frequency RFID reader, system, method, device and storage medium for solving the problem that the intermediate frequency signal output during the RFID reading and writing process in the prior art has a noise component that is avoided.

The application provides an ultrahigh frequency RFID read-write system for achieving the aim and other related aims, which comprises a transmitting module, a coupling module, an antenna module, a control module, a receiving module, an interface module and a power module, wherein the transmitting module comprises a voltage-controlled oscillator, a first power divider and a power amplifier, the receiving module comprises a phase shifting circuit, a mixer, an intermediate frequency filter and an intermediate frequency amplifier, the control module is electrically connected with the mixer and is used for controlling the mixer to select local oscillation signals subjected to different phase shifting processes, and the phase shifting circuit is electrically connected with the first power divider and the mixer respectively.

In an embodiment of the application, the phase shifting circuit comprises a second power divider, a first phase shifter and a second phase shifter, wherein the input end of the second power divider is electrically connected with the output end of the first power divider, the input ends of the first phase shifter and the second phase shifter are respectively and electrically connected with the output end of the second power divider, and the output ends of the first phase shifter and the second phase shifter are respectively and electrically connected with the input end of the mixer.

In an embodiment of the application, the phase-shift angle parameter values of the first phase shifter and the second phase shifter are preset to be different by 90 °.

In an embodiment of the present application, the control module controls the local oscillator input switch of the mixer to select a phase shifter corresponding to a smaller noise by comparing the noise level of the obtained first signal phase-shifted by the first phase shifter with the noise level of the obtained second signal phase-shifted by the second phase shifter.

In an embodiment of the application, the control module adjusts the phase-shift angle parameter value of the first phase shifter or the second phase shifter according to the noise in the first signal or the second signal obtained each time through gaussian distribution of the noise.

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

In an embodiment of the application, the first phase shifter and the second phase shifter are load line phase shifters, the load line phase shifters comprise 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 respectively and electrically connected with one end of the second inductor and one end of the capacitor, the other end of the second inductor is an output end, and the other end of the capacitor is grounded.

To achieve the above and other related objects, the present application provides an ultrahigh frequency RFID reader including the ultrahigh frequency RFID reader system as described above.

To achieve the above and other related objects, the present application provides an ultrahigh frequency RFID read-write method applied to an ultrahigh frequency RFID read-write system including a first phase shifter, a second phase shifter, and a mixer, where the method includes obtaining a first signal phase-shifted by the first phase shifter and a second signal phase-shifted by the second phase shifter, comparing noise magnitudes of the first signal and the second signal to control the mixer to select a phase shifter corresponding to a smaller noise, and/or adjusting an output voltage according to a gaussian distribution of noise of the first signal or the second signal to enable the phase shifter to adjust a corresponding phase-shift angle parameter value.

To achieve the above and other related objects, the present application provides an ultrahigh frequency RFID read-write device, which includes an acquisition unit configured to acquire a first signal phase-shifted by the first phase shifter and a second signal phase-shifted by the second phase shifter, a processing unit configured to compare noise magnitudes of the first signal and the second signal to control the mixer to selectively connect a phase shifter corresponding to a smaller noise, and/or adjust an output voltage according to a gaussian distribution of noise of the first signal or the second signal, so that the phase shifter adjusts a corresponding phase-shift angle parameter value.

To achieve the above and other related objects, the present application provides an ultrahigh frequency RFID read-write device, which includes a memory, a processor, and a communicator, wherein the memory stores a computer program, the processor executes the computer program to implement the ultrahigh frequency RFID read-write method as described above, and the communicator is communicatively connected to an external device.

To achieve the above and other related objects, the present application provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the ultra-high frequency RFID read-write method as described above.

As described above, the present application provides an ultrahigh frequency RFID reader, system, method, apparatus and storage medium. And comparing the noise magnitudes of the first signal and the second signal through obtaining the first signal subjected to phase shifting treatment of the first phase shifter and the second signal subjected to phase shifting treatment of the second phase shifter so as to control the mixer to select a phase shifter corresponding to the smaller noise, and/or adjusting output voltage according to Gaussian distribution of the noise of the first signal or the second signal so as to enable the phase shifter to adjust corresponding phase shifting angle parameter values.

The following beneficial effects are achieved:

noise components in the output intermediate frequency signals can be greatly reduced, and demodulation capability and reading and writing distance of the reader-writer are effectively improved.

Drawings

Fig. 1 is a schematic structural diagram of an ultrahigh frequency RFID read-write system according to an embodiment of the application.

Fig. 2 is a schematic circuit diagram of a load line phase shifter according to an embodiment of the application.

Fig. 3 is a flow chart of an ultrahigh frequency RFID read-write method according to an embodiment of the application.

Fig. 4 is a schematic block diagram of an ultrahigh frequency RFID read-write device according to an embodiment of the application.

Fig. 5 is a schematic structural diagram of an ultrahigh frequency RFID read-write device according to an embodiment of the present application.

Detailed Description

Other advantages and effects of the present application will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present application with reference to specific examples. The application may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present application. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.

It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present application by way of illustration, and only the components related to the present application are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.

Radio frequency identification (Radio Frequency Identification, RFID) is a wireless communication technology, which is a non-contact automatic identification technology that uses radio frequency signal spatial coupling to identify a target and acquire target data. The RFID technology has the most important advantages of non-contact identification, can penetrate through severe environments where bar codes such as snow, fog, ice, paint and dust can not be used for reading the tags, can simultaneously identify a plurality of tags, and has the advantages of small size, diversified shapes, strong pollution resistance, reusability, large data memory capacity, encryption and the like. Along with the development of RFID technology, the application fields of RFID technology are becoming wider, such as food safety tracing, book borrowing and returning systems, access control systems, warehouse management, parking lot management systems, traffic monitoring management and the like. It has been pointed out by experts that RFID technology is likely to be a new technology that affects global economy and life, following mobile communication technology and internet technology.

The RFID electronic tags are divided into three electronic tags including active electronic tags, passive electronic tags, semi-active and semi-passive electronic tags and the like according to different energy source obtaining modes. The active electronic tag is also called an active tag, the working power supply of the tag is completely supplied by an internal battery, meanwhile, the radio frequency energy required by the communication between the electronic tag and a reader is also supplied by the battery, the tag has a longer reading/writing distance, a larger external dimension, a thicker external dimension and a heavier external dimension, the cost is high, the application field is limited, the battery cannot be used for a long time, and the battery needs to be replaced after the energy is exhausted. The semi-active electronic tag is also called a semi-active tag, the battery only supplies power to a circuit for maintaining data in the tag, the tag is in a dormant state before being in an operating state, which is equivalent to a passive tag, when the tag enters a reading area of a reader, the tag is excited by a radio frequency signal sent by the reader to enter the operating state, and the advantages and disadvantages of the tag are basically the same as those of the active tag. The passive electronic tag is also called a passive tag, has no built-in battery, converts part of the energy from the radio frequency energy emitted by the reader into the power supply required by the work of the tag, has small and exquisite appearance, light weight, thinness, convenient installation, low cost and long service life, is suitable for various use occasions, and can be maintenance-free.

In addition, the ultra-high frequency RFID (the working frequency band of 860-960MHz is regulated by the international standard ISO 18000-6C) has shorter working wavelength compared with the working wavelength of 13.56MHz and 125KHz of low frequency thereof, and the antenna has small and flexible size and flexible application, so the ultra-high frequency passive tag and reader become the key direction of the development of the field of the Internet of things in recent years.

Referring to fig. 1, a schematic structure diagram of an ultrahigh frequency RFID read-write system according to an embodiment of the application is shown. As shown, the uhf RFID read-write 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.

The transmitting module 110 is electrically connected to the coupling module 120, 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, and the receiving module 150 and the interface module 160 are electrically connected to the control module 140. In addition, the power module 170 is electrically connected to each module to provide power, and it should be understood that a schematic diagram of the electrical connection between the power module 170 and each module is not shown in fig. 1 for brevity.

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. As can be seen in fig. 1, the input end of the voltage controlled oscillator 111 is electrically connected to one end of the control module 140, the output end thereof 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.

In this embodiment, the voltage-controlled oscillator 111 is mainly used for providing an oscillation signal, i.e. the local oscillation signal of the present application, and the first power divider 112 is mainly used for dividing power and is one input and two outputs. The power amplifier 113 is mainly used for amplifying power.

In general, a voltage-controlled oscillator refers to an oscillating circuit (VCO) having an output frequency corresponding to an input control voltage, the frequency of the VCO being a function of an input signal voltage, and an operating state of the oscillator or an element parameter of an oscillating circuit being controlled by the input control voltage, so as to form a voltage-controlled oscillator.

The power divider is a device for dividing one input signal energy into two paths or outputting equal or unequal energy by multiple paths, and can also reversely combine multiple paths of signal energy into one path for output, and can also be called a combiner at the moment. Certain isolation should be ensured between the output ports of one power divider. The power divider is generally divided into one-by-two (one input and two output), one-by-three (one input and three output) and the like by 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 degree, amplitude balance degree, phase balance degree, power capacity, frequency bandwidth and the like among the power distribution ports.

A power amplifier (english name) is an amplifier that can generate maximum power output to drive a load (e.g., a speaker) under a given distortion rate. The power amplifier plays a role of a pivot for organizing and coordinating in the whole sound system, and the power amplifier dominates whether the whole sound system can provide good tone quality output to a certain extent.

In the present embodiment, the voltage-controlled oscillator 111, the first power divider 112 and the power amplifier 113 are all devices of a common type in the prior art, and no special design or requirement is required, i.e. any type of voltage-controlled oscillator or power divider or power amplifier is included in the scope of the present application.

The antenna module 130 is mainly used for radiating and receiving radio waves, and the coupling module 120 is preferably a directional coupler for stabilizing an external signal carrier received by the antenna module 130.

The directional coupler is a universal microwave/millimeter wave component and can be used for signal isolation, separation and mixing, such as power monitoring, source output power amplitude stabilization, signal source isolation, transmission and reflection sweep frequency testing and the like. The main technical indexes include directivity, standing wave ratio, coupling degree and insertion loss.

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.

In this embodiment, the intermediate frequency filter 153 and the intermediate frequency amplifier 154 are mainly used for processing intermediate frequency signals in the carrier signal. The mixer 152 is mainly used for mixing the frequencies of the signals from the transmitting module 110 and the coupling module 120.

Specifically, the output signal frequency of the mixer 152 is equal to the sum, difference, or other combination of the two input signal frequencies. In the prior art, mixers are typically composed of a nonlinear element and a frequency selective loop. The mixer is located after the Low Noise Amplifier (LNA) and directly processes the LNA amplified radio frequency signal. To achieve the mixing function, the mixer also needs to receive a Local Oscillator (LO) signal from a voltage controlled oscillator, and its circuit operates completely in the radio frequency band.

In an embodiment of the application, the phase shift circuit 151 includes a second power divider 155, a first phase shifter 156, and a second phase shifter 157, wherein an input end of the second power divider 155 is electrically connected to an output end of the first power divider 112, input ends of the first phase shifter 156 and the second phase shifter 157 are respectively electrically connected to an output end of the second power divider 155, and output ends of the first phase shifter 156 and the second phase shifter 157 are respectively electrically connected to an input end of the mixer 152.

In general, a phase shifter is a device capable of adjusting the phase of a wave. A typical phase shifter circuit is composed of resistors, reactance elements, nonlinear elements, active devices, etc., whose phase changes as a sinusoidal signal passes through the phase shifter. When the ideal phase shifter adjusts circuit parameters, the phase of the passing signal can be continuously changed between 0-360 degrees, the amplitude of the signal is not changed, namely the signal can pass without distortion, and the phase is only changed.

In one embodiment of the present application, the first phase shifter 156 and the second phase shifter 157 are load line phase shifters. Please refer to fig. 2. The load line phase shifter in the figure comprises a first inductor, a second inductor and a capacitor, wherein one end of the first inductor is an input end, the other end of the first inductor is electrically connected with 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.

In an embodiment of the present application, the control module 140 is electrically connected to the mixer 152, and is configured to control the mixer 152 to select local oscillation signals subjected to different phase shifting processes;

Specifically, the control module 140 controls the local oscillator input switch of the mixer 152 to select the phase shifter corresponding to the smaller noise by comparing the noise level of the obtained first signal phase-shifted by the first phase shifter 156 with the noise level of the obtained second signal phase-shifted by the second phase shifter 157.

In the case of applying the ultra-high frequency borderless RFID technology, when the signal returned from the RFID tag enters the mixer 152, if the noise signal is orthogonal to the carrier signal (i.e., 90 °), the noise component in the intermediate frequency signal output from the mixer 152 is minimal.

Based on this, one embodiment of the manner in which the control module 140 controls the mixer 152 to select the local oscillation signals subjected to different phase shifting processes is that the phase shifting angle parameter values of the first phase shifter 156 and the second phase shifter 157 are preset to be different by 90 °.

In this embodiment, the phase shift angle parameter values of the first phase shifter 156 and the second phase shifter 157 are preset, and may be set multiple times according to the actual output effect, i.e. may be preset multiple times manually.

For example, assume that the phase shift angle of the first phase shifter 156 is set to 30 °, and the phase shift angle of the corresponding second phase shifter 157 is set to 60 ° (the phase shift angle from the first phase shifter 156 remains 90 °). Then the carrier signals are phase-shifted by the first phase shifter 156 and the second phase shifter 157 respectively, and then the carrier signals of the two phase shifters and the noise signal have intersecting angles, if the intersecting angles are larger, the noise component is larger, and as the phase shift angles of the two phase shifters are kept 90 degrees different, one intersecting angle is smaller, one intersecting angle is larger, and of course, the two intersecting angles with extremely small probability are the same. From the above, the control module 140 may select the phase shifter corresponding to the smaller noise through controlling the local oscillator input switch of the mixer 152.

Another embodiment of the manner in which the control module 140 controls the mixer 152 to select the local oscillation signals subjected to different phase shifting processes is that the control module 140 adjusts the phase shifting angle parameter values of the first phase shifter 156 or the second phase shifter 157 according to the noise in the first signal or the second signal obtained each time through the gaussian distribution of the noise.

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

For example, according to the gaussian distribution of noise, the maximum value of noise is the highest value in the middle of the gaussian distribution, and accordingly, the noise value decreases once to both sides. Therefore, the Gaussian distribution of noise can be used as a guide for adjusting the angle. For example, when the noise value is maximum, a phase shift angle adjusted accordingly is 90 °. Then, in particular, the control module 140 divides the input voltage into a plurality of sections to respectively correspond to different adjustment angles, for example, increase by 1 to 1.5v, and correspondingly adjust the phase shifter by 5 to 10 ° or the like, so that the control module 140 can adjust the input voltage 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.

For the latter embodiment, the cost of implementation is higher than that of the former embodiment due to the higher processing requirements imposed on the control module 140. However, the output signals obtained by the two embodiments can greatly reduce noise components in the output intermediate frequency signals, and effectively improve demodulation capability and read-write distance of the reader-writer.

In this embodiment, the control module 140 may be a micro control unit (Microcontroller Unit; MCU), or a single-chip Microcomputer (SINGLE CHIP Microcomputer) or a single-chip Microcomputer, or may be a single-core microprocessor or a multi-core microprocessor. The control module 140 may also be a general-purpose processor, including a central Processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), a digital signal processor (DIGITAL SIGNAL Processing, DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable gate array (FPGA) or other Programmable logic device, discrete gate or transistor logic device, or discrete hardware components.

The interface module 106 is electrically connected to the control module 150, and is used for connecting to an external device or other communication devices. Common industrial equipment interfaces include, for example, RJ45 interfaces, SC fiber interfaces, FDDI interfaces, AUI interfaces, BNC interfaces, condole interfaces, and the like.

It should be noted that, the above division of each module in the ultra-high frequency RFID read/write system 100 is only a division of a logic function, and may be fully or partially integrated into a physical entity or may be physically separated. The modules can be realized in a form of calling the processing element through software, can be realized in a form of hardware, can also be realized in a form of calling the processing element through part of units, and can be realized in a form of hardware.

In an embodiment of the present application, the present application further provides an ultrahigh frequency RFID reader, where the reader includes an ultrahigh frequency RFID reader system as described in fig. 1.

Fig. 3 is a schematic flow chart of a protocol conversion method according to an embodiment of the present application. As shown, the method is applied to an ultrahigh frequency RFID read-write system including a first phase shifter, a second phase shifter, and a mixer, and includes:

step S301, a first signal subjected to phase shift processing by the first phase shifter and a second signal subjected to phase shift processing by the second phase shifter are obtained.

Step S302, comparing the noise magnitudes of the first signal and the second signal to control the mixer to select a 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 enable the phase shifter to adjust the corresponding phase-shifting angle parameter value.

For example, assume that the phase shift angle of the first phase shifter is set to 30 °, and the phase shift angle of the corresponding second phase shifter is set to 60 ° (the phase shift angle from the first phase shifter remains 90 °). Then the carrier signals are phase-shifted by the first phase shifter 156 and the second phase shifter 157 respectively, and then the carrier signals of the two phase shifters and the noise signal have intersecting angles, if the intersecting angles are larger, the noise component is larger, and as the phase shift angles of the two phase shifters are kept 90 degrees different, one intersecting angle is smaller, one intersecting angle is larger, and of course, the two intersecting angles with extremely small probability are the same. By the above, the phase shifter corresponding to the smaller noise can be selected by controlling the local oscillation input switch of the mixer.

For another example, the noise maximum value is the highest value in the middle of the gaussian distribution chart, and accordingly, the noise value decreases once to two sides. Therefore, the Gaussian distribution of noise can be used as a guide for adjusting the angle. For example, when the noise value is maximum, a phase shift angle adjusted accordingly is 90 °. Then, the input voltage is divided into a plurality of sections to respectively correspond to different adjustment angles, for example, 1-1.5V is increased, and the phase shifter is correspondingly adjusted by 5-10 degrees, so that the purpose of correspondingly 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.

Fig. 4 shows a schematic block diagram of an ultrahigh frequency RFID read-write device according to an embodiment of the present application. As shown, the apparatus 400 includes an acquisition unit 401 and a processing unit 402.

The obtaining unit 401 is configured to obtain a first signal phase-shifted by the first phase shifter and a second signal phase-shifted by the second phase shifter;

The processing unit 402 is configured to compare the noise magnitudes of the first signal and the second signal to control the mixer to select a phase shifter corresponding to the smaller noise, and/or adjust an output voltage according to a gaussian distribution of the noise of the first signal or the second signal, so that the phase shifter adjusts a corresponding phase shift angle parameter value.

It is understood that the ultra-high frequency RFID read/write device 400 can implement the ultra-high frequency RFID read/write method as described in fig. 3 through the operation of each unit.

It should be noted that, it should be understood that the division of the units of the above apparatus is merely a division of a logic function, and may be fully or partially integrated into one physical entity or may be physically separated. The units can be realized in a form of calling the processing element through software, can be realized in a form of hardware, can also be realized in a form of calling the processing element through part of the units, and can be realized in a form of hardware. For example, the processing unit 402 may be a processing element that is set up separately, may be implemented in a chip of the above apparatus, or may be stored in a memory of the above apparatus in the form of program codes, and may be called by a processing element of the above apparatus to execute the functions of the above processing unit 402. The implementation of the other units is similar. Furthermore, all or part of these units may be integrated together or may be implemented independently. The processing element described herein may be an integrated circuit having signal processing capabilities. In implementation, each step of the above method or each unit above may be implemented by an integrated logic circuit of hardware in a processor element or an instruction in the form of software.

For example, the above elements 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 microprocessors (DIGITAL SIGNAL processors, DSPs), or one or more field programmable gate arrays (Field Programmable GATE ARRAY, FPGAs), or the like. For another example, when a unit is implemented in the form of a processing element scheduler code, the processing element may be a general purpose processor, such as a central processing unit (Central Processing Unit, CPU) or other processor that may invoke the program code. For another example, the units may be integrated together and implemented in the form of a system-on-a-chip (SOC).

Referring to fig. 5, a schematic structural diagram of an ultrahigh frequency RFID read-write device according to an embodiment of the present application is shown, and as shown in the drawing, the protocol conversion device 500 includes a memory 501, a processor 502, and a communicator 503. The memory 501 stores a computer program, the processor 502 executes the computer program to implement the ultra-high frequency RFID read/write method as shown in fig. 3, and the communicator 503 is communicatively connected to an external device.

The memory 501 may include a random access memory (Random Access Memory, abbreviated as RAM) and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

The processor 502 may be a general-purpose processor including a central Processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc., a digital signal processor (DIGITAL SIGNAL Processing, 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 components.

The communicator 503 is configured to implement communication connections between other devices (e.g., clients, controllers, read-write libraries, and read-only libraries). Which may include one or more sets of modules of different communication means. The communication connection may be one or more wired/wireless communication means and combinations thereof. The communication means may 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. Such as any one or more of WIFI, bluetooth, NFC, GPRS, GSM, and ethernet.

In one embodiment of the present application, a computer readable storage medium is provided, on which a computer program is stored, which when executed by a processor implements an ultra-high frequency RFID read/write method as described in fig. 3.

The computer readable storage medium, those skilled in the art will appreciate that the embodiments implementing the functions of the above system and units can be implemented by hardware related to a computer program. The aforementioned computer program may be stored in a computer readable storage medium. The program, when executed, performs embodiments including the functions of the system and the units described above, and the storage medium described above includes various media capable of storing program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

In summary, the application provides an ultrahigh frequency RFID reader, a system, a method, a device and a storage medium. And comparing the noise magnitudes of the first signal and the second signal through obtaining the first signal subjected to phase shifting treatment of the first phase shifter and the second signal subjected to phase shifting treatment of the second phase shifter so as to control the mixer to select a phase shifter corresponding to the smaller noise, and/or adjusting output voltage according to Gaussian distribution of the noise of the first signal or the second signal so as to enable the phase shifter to adjust corresponding phase shifting angle parameter values.

The application effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles of the present application and its effectiveness, and are not intended to limit the application. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the application. Accordingly, it is intended that all equivalent modifications and variations of the application be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (11)

1. The ultrahigh frequency RFID read-write system is characterized by comprising a transmitting module, a coupling module, an antenna module, a control module, a receiving module, an interface module and a power supply module;

the transmitting module comprises a voltage-controlled oscillator, a first power divider and a radio frequency power amplifier;

The receiving module comprises a phase shifting circuit, a mixer, an intermediate frequency filter and an intermediate frequency amplifier;

The control module is electrically connected with the mixer and is used for controlling the mixer to select local oscillation signals subjected to different phase shifting processes;

the phase shifting circuit is respectively and electrically connected with the first power divider and the mixer;

the phase shifting circuit comprises a second power divider, a first phase shifter and a second phase shifter, wherein the input end of the second power divider is electrically connected with the output end of the first power divider, the input ends of the first phase shifter and the second phase shifter are respectively and electrically connected with the output end of the second power divider, and the output ends of the first phase shifter and the second phase shifter are respectively and electrically connected with the input end of the mixer.

2. The uhf RFID read-write system according to claim 1, wherein the phase shift angle parameter values of the first phase shifter and the second phase shifter are preset to be different by 90 °.

3. The system of claim 1, wherein the control module controls the local oscillator input switch of the mixer to selectively connect the phase shifter corresponding to the smaller noise by comparing the noise level of the obtained first signal phase-shifted by the first phase shifter with the noise level of the second signal phase-shifted by the second phase shifter.

4. The system of claim 3, wherein the control module adjusts the phase angle parameter value of the first phase shifter or the second phase shifter according to the noise in the first signal or the second signal obtained each time by gaussian distribution of the noise.

5. The uhf RFID read-write system of claim 4, wherein the control module adjusts the phase 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 ultrahigh frequency RFID read-write system according to claim 1, wherein the first phase shifter and the second phase shifter are load line phase shifters, the load line phase shifters comprise 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 with 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.

7. An ultrahigh frequency RFID reader comprising the ultrahigh frequency RFID reader system according to any one of claims 1 to 6.

8. An ultrahigh frequency RFID read-write method, which is applied to an ultrahigh frequency RFID read-write system including a first phase shifter, a second phase shifter, and a mixer, the method comprising:

obtaining a first signal subjected to phase shifting treatment by the first phase shifter and a second signal subjected to phase shifting treatment by the second phase shifter;

And/or adjusting output voltage according to Gaussian distribution of noise of the first signal or the second signal so as to enable the phase shifter to adjust corresponding phase-shifting angle parameter values.

9. An ultrahigh frequency RFID read-write device, applied to an ultrahigh frequency RFID read-write 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 phase-shifted by the first phase shifter and a second signal phase-shifted by the second phase shifter;

And the processing unit is used for comparing the noise magnitudes of the first signal and the second signal so as to control the mixer to select a 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 so as to enable the phase shifter to adjust the corresponding phase-shifting angle parameter value.

10. The ultrahigh frequency RFID read-write equipment is characterized by comprising 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 read-write method according to claim 8, and the communicator is in communication connection with an external device.

11. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the ultra-high frequency RFID read-write method as claimed in claim 8.