Identification positioning method and device

Abstract

The invention discloses an identification positioning method and device, and the method comprises the steps: transmitting a first fundamental frequency signal to M electronic tag devices, the M tag devices comprising a target tag device, and M being an integer greater than 0; a second fundamental frequency signal sent by each tag device in N tag devices in the M tag devices is received, the second fundamental frequency signal comprises identification information of each tag device, and N is an integer larger than 0 and smaller than or equal to M; based on the identification information, a third fundamental frequency signal is sent to the target tag device, and the third fundamental frequency signal is used for positioning detection; receiving a harmonic reflection signal returned by the target tag equipment; and determining position information of the target tag equipment according to the third fundamental frequency signal and the harmonic reflection signal. According to the application, the target identification and accurate positioning capabilities of the first equipment can be improved, and the power consumption and the cost can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of communication technologies, and in particular, to an identification and positioning method and device. Background Art

[0002] With the rapid development of Internet technologies, the Internet of Things (IOT) has been widely applied in various fields. In indoor and outdoor scenarios such as home, industry, security, nursing, and search and rescue, to meet the connection requirements of IOT, a large number of tags for identifying target items and precise positioning are required in the system to drive broader applications, such as item positioning and searching, device status monitoring, etc. Due to the wide range of application scenarios and large specification differences, there are currently multiple different systems, such as active tag systems, passive tag systems, and radar-based target positioning systems. However, the cost and power consumption of active tag systems are relatively high; the detection distance of passive tag systems is short; the radar-based target positioning system detects all targets in the environment, cannot achieve target identification, and is prone to mutual interference. Summary of the Invention

[0003] Embodiments of the present application provide an identification and positioning method and device, which can not only improve the ability of the first device to identify and precisely position targets, but also reduce power consumption and cost.

[0004] In a first aspect, embodiments of the present application provide an identification and positioning method, which is applied to a first device, or a chip or circuit configured in the first device, and includes:

[0005] Sending a first fundamental frequency signal to M tag devices, where the M tag devices include a target tag device, and M is an integer greater than 0; receiving second fundamental frequency signals sent by each of the N tag devices among the M tag devices, where the second fundamental frequency signal includes identification information of each tag device, and N is an integer greater than 0 and less than or equal to M; based on the identification information, sending a third fundamental frequency signal to the target tag device, where the third fundamental frequency signal is used for positioning detection; receiving a harmonic reflection signal returned by the target tag device; and determining the position information of the target tag device according to the third fundamental frequency signal and the harmonic reflection signal.

[0006] By receiving the second fundamental frequency signals to obtain the identification information of each of the N tag devices, and then based on the identification information, identifying the target tag device from the N tag devices, the ability of the first device to identify targets can be improved. Based on the third fundamental frequency signal and the harmonic reflection signal, determining the position information of the target tag device can improve the ability of the first device to precisely position targets. Through harmonic communication, environmental interference and data processing complexity can be reduced, and moreover, communication interaction can be performed between the first device and the target tag device.

[0007] In a possible design, before sending a third fundamental frequency signal to a target tag device based on identification information, a fourth fundamental frequency signal is sent to the target tag device based on the identification information of the target tag device. The fourth fundamental frequency signal includes first indication information for indicating the target tag device to switch from a first operating mode to a second operating mode. The first operating mode is for rectifying and storing energy, and the second operating mode is for item finding and positioning. By sending the fourth fundamental frequency signal to the target tag device, the target tag device is switched from a state of high-efficiency rectification to a state of low-efficiency rectification and high-efficiency reflection, which is beneficial to improving the accurate positioning ability of the first device.

[0008] In another possible design, after sending the fourth fundamental frequency signal to the target tag device, a fifth fundamental frequency signal sent by the target tag device is received. The fifth fundamental frequency signal includes confirmation information for indicating that the target tag device is communicatively connected to the first device. By receiving the fifth fundamental frequency signal sent by the target tag device, the first device determines that a communication handshake is established with the target tag device, which is beneficial to the first device for item finding and positioning of the target tag device.

[0009] In another possible design, the fourth fundamental frequency signal further includes the identification information of the target tag device.

[0010] In another possible design, a sixth fundamental frequency signal is sent to the target tag device. The sixth fundamental frequency signal includes second indication information for indicating the target tag device to switch from the second operating mode to the first operating mode. The first operating mode is for rectifying and storing energy, and the second operating mode is for item finding and positioning. By sending the sixth fundamental frequency signal to the target tag device, the target tag device is switched from a state of low-efficiency rectification and high-efficiency reflection to a state of high-efficiency rectification, which is beneficial to reducing the power consumption of the target tag device.

[0011] In another possible design, the position information includes distance information; an intermediate frequency signal is obtained by processing the third fundamental frequency signal and the harmonic reflection signal, and the distance information is determined according to the frequency of the intermediate frequency signal; or the time delay information between the third fundamental frequency signal and the harmonic reflection signal is determined, and the distance information is determined according to the time delay information. By determining the distance information of the target tag device, it is beneficial to improving the accurate positioning ability of the first device, and harmonic communication is beneficial to reducing environmental interference and data processing complexity and increasing the detection distance.

[0012] In another possible design, the first device includes an antenna module. The antenna module includes a fundamental frequency antenna and a harmonic antenna. The fundamental frequency antenna is used to receive or send fundamental frequency signals, and the harmonic antenna is used to receive harmonic signals. Co-locating the fundamental frequency antenna and the harmonic antenna in the first device is beneficial to the first device for realizing miniaturized design.

[0013] In another possible design, the harmonic antenna includes a first receiving antenna and a second receiving antenna. The first receiving antenna is used to receive harmonic signals in a first horizontal direction, and the second receiving antenna is used to receive harmonic signals in a second horizontal direction.

[0014] In another possible design, the position information further includes horizontal measurement information; receiving a harmonic reflection signal through the first receiving antenna; receiving a harmonic reflection signal through the second receiving antenna; determining the horizontal measurement information according to the amplitude-phase difference between the harmonic reflection signal received by the first receiving antenna and the harmonic reflection signal received by the second receiving antenna. By determining the horizontal measurement information of the target tag device, performing horizontal angle positioning and distance positioning on the target tag device is beneficial to improving the accurate positioning ability of the first device.

[0015] In another possible design, the harmonic antenna includes a third receiving antenna and a fourth receiving antenna. The third receiving antenna is used to receive harmonic signals in a first vertical direction, and the fourth receiving antenna is used to receive harmonic signals in a second vertical direction.

[0016] In another possible design, the position information further includes vertical measurement information; receiving a harmonic reflection signal through the third receiving antenna; receiving a harmonic reflection signal through the fourth receiving antenna; determining the vertical measurement information according to the amplitude-phase difference between the harmonic reflection signal received by the third receiving antenna and the harmonic reflection signal received by the fourth receiving antenna. By determining the vertical measurement information of the target tag device, performing vertical angle positioning and distance positioning on the target tag device is beneficial to improving the accurate positioning ability of the first device.

[0017] In a second aspect, an identification and positioning method is provided in an embodiment of the present application. The method is applied to a tag device, or a chip or circuit configured in the tag, and includes:

[0018] Receiving a first fundamental frequency signal sent by a first device; based on the first fundamental frequency signal, sending a second fundamental frequency signal to the first device, where the second fundamental frequency signal includes identification information of the tag device; receiving a third fundamental frequency signal sent by the first device, where the third fundamental frequency signal is used for positioning detection; based on the third fundamental frequency signal, returning a harmonic reflection signal to the first device, where the harmonic reflection signal is used to determine the position information of the tag device.

[0019] By sending a second fundamental frequency signal carrying the identification information of the tag device to the first device, enabling the first device to identify based on the identification information of the tag device, the target recognition ability of the first device can be improved. By returning a harmonic reflection signal to the first device, enabling the first device to determine the position information of the tag device, the precise positioning ability of the first device can be improved. Through harmonic communication, environmental interference and data processing complexity can be reduced, the detection distance can be increased, and the energy consumption problem of the tag device can be solved by a rectenna. Moreover, communication interaction can be carried out between the tag device and the first device.

[0020] In a possible design, before receiving the third fundamental frequency signal sent by the first device, the fourth fundamental frequency signal sent by the first device is received. The fourth fundamental frequency signal includes first indication information; according to the first indication information, a switch is made from the first working mode to the second working mode. The first working mode is for rectifying and storing energy, and the second working mode is for object searching and positioning. By receiving the fourth fundamental frequency signal sent by the first device, the tag device switches from a state of high-efficiency rectification to a state of low-efficiency rectification and high-efficiency reflection, which is beneficial to improving the precise positioning ability of the first device.

[0021] In another possible design, after receiving the fourth fundamental frequency signal sent by the first device, a fifth fundamental frequency signal is sent to the first device. The fifth fundamental frequency signal includes confirmation information, and the confirmation information is used to indicate that the tag device is communicatively connected to the first device. By sending the fifth fundamental frequency signal to the first device, so that the first device can determine that the target tag device establishes a communication handshake with it, which is beneficial to improving the precise positioning ability of the first device.

[0022] In another possible design, the fourth fundamental frequency signal further includes the identification information of the tag device.

[0023] In another possible design, the sixth fundamental frequency signal sent by the first device is received. The sixth fundamental frequency signal includes second indication information, and according to the second indication information, a switch is made from the second working mode to the first working mode; or if no indication information from the first device is received within a preset time period after sending the harmonic reflection signal to the first device, a switch is made from the second working mode to the first working mode; wherein, the first working mode is for rectifying and storing energy, and the second working mode is for object searching and positioning. By receiving the sixth fundamental frequency signal sent by the first device, the tag device switches from a state of low-efficiency rectification and high-efficiency reflection to a state of high-efficiency rectification, which is beneficial to the continuous standby of the tag device and subsequent timely response.

[0024] In another possible design, the tag device includes a rectenna, and the rectenna includes a fifth receiving antenna and a rectifying circuit; the first fundamental frequency signal is received through the fifth receiving antenna; the first fundamental frequency signal is rectified through the rectifying circuit to obtain the first stored electric quantity. Energy accumulation through the rectenna is beneficial to solving the energy consumption problem of the tag device.

[0025] In another possible design, when the first stored electric quantity is greater than or equal to a preset threshold, a second fundamental frequency signal is sent to the first device. By determining that the first stored electric quantity is greater than or equal to the preset threshold, it is beneficial for the tag device to maintain communication with the outside and avoid dormancy and disconnection.

[0026] In another possible design, the tag device includes an antenna module, and the antenna module includes a fundamental frequency antenna and a harmonic antenna. The fundamental frequency antenna is used to receive or send a fundamental frequency signal, and the harmonic antenna is used to send a harmonic signal. Co-locating the fundamental frequency antenna and the harmonic antenna in the tag device is beneficial for the tag device to achieve a miniaturized design.

[0027] In another possible design, the tag device is a passive electronic tag. Using the passive electronic tag as the tag device does not require an external power supply and can reduce costs and power consumption.

[0028] In a third aspect, an embodiment of the present application provides an identification and positioning device, which is applied to the first device, or configured in a chip or circuit in the first device, and includes:

[0029] A sending module, configured to send a first fundamental frequency signal to M electronic tag devices, where the M tag devices include a target tag device, and M is an integer greater than 0.

[0030] A receiving module, configured to receive a second fundamental frequency signal sent by each of the N tag devices among the M tag devices, where the second fundamental frequency signal includes the identification information of each tag device, and N is an integer greater than 0 and less than or equal to M.

[0031] The sending module is further configured to send a third fundamental frequency signal to the target tag device based on the identification information, where the third fundamental frequency signal is used for positioning detection.

[0032] The receiving module is further configured to receive a harmonic reflection signal returned by the target tag device.

[0033] A processing module, configured to determine the position information of the target tag device according to the third fundamental frequency signal and the harmonic reflection signal.

[0034] In a possible design, the sending module is further configured to, before sending a third fundamental frequency signal to the target tag device based on the identification information, send a fourth fundamental frequency signal to the target tag device based on the identification information of the target tag device. The fourth fundamental frequency signal includes first indication information for indicating the target tag device to switch from a first operating mode to a second operating mode. The first operating mode is for rectifying and storing energy, and the second operating mode is for item finding and positioning.

[0035] In another possible design, the receiving module is further configured to, after sending the fourth fundamental frequency signal to the target tag device, receive a fifth fundamental frequency signal sent by the target tag device. The fifth fundamental frequency signal includes confirmation information for indicating that the target tag device is communicatively connected to the first device.

[0036] In another possible design, the fourth fundamental frequency signal further includes the identification information of the target tag device.

[0037] In another possible design, the sending module is further configured to send a sixth fundamental frequency signal to the target tag device. The sixth fundamental frequency signal includes second indication information for indicating the target tag device to switch from the second operating mode to the first operating mode. The first operating mode is for rectifying and storing energy, and the second operating mode is for item finding and positioning.

[0038] In another possible design, the position information includes distance information.

[0039] In another possible design, the processing module is further configured to process the third fundamental frequency signal and the harmonic reflection signal to obtain an intermediate frequency signal, and determine the distance information according to the frequency of the intermediate frequency signal; or determine the time delay information between the third fundamental frequency signal and the harmonic reflection signal, and determine the distance information according to the time delay information.

[0040] In another possible design, the first device includes an antenna module. The antenna module includes a fundamental frequency antenna and a harmonic antenna. The fundamental frequency antenna is used to receive or send fundamental frequency signals, and the harmonic antenna is used to receive harmonic signals.

[0041] In another possible design, the harmonic antenna includes a first receiving antenna and a second receiving antenna. The first receiving antenna is used to receive harmonic signals in a first horizontal direction, and the second receiving antenna is used to receive harmonic signals in a second horizontal direction.

[0042] In another possible design, the position information further includes horizontal determination information.

[0043] In another possible design, the processing module is further configured to receive the harmonic reflection signal through the first receiving antenna; receive the harmonic reflection signal through the second receiving antenna; and determine the horizontal measurement information according to the amplitude-phase difference between the harmonic reflection signal received by the first receiving antenna and the harmonic reflection signal received by the second receiving antenna.

[0044] In another possible design, the harmonic antenna includes a third receiving antenna and a fourth receiving antenna. The third receiving antenna is configured to receive the harmonic signal in the first vertical direction, and the fourth receiving antenna is configured to receive the harmonic signal in the second vertical direction.

[0045] In another possible design, the position information further includes vertical measurement information.

[0046] In another possible design, the processing module is further configured to receive the harmonic reflection signal through the third receiving antenna; receive the harmonic reflection signal through the fourth receiving antenna; and determine the vertical measurement information according to the amplitude-phase difference between the harmonic reflection signal received by the third receiving antenna and the harmonic reflection signal received by the fourth receiving antenna.

[0047] The operations and beneficial effects performed by the identification and positioning device can refer to the method and beneficial effects described in the first aspect above, and the repeated parts will not be elaborated.

[0048] In a fourth aspect, an embodiment of the present application provides an identification and positioning device, which is applied to a tag device, or configured in a chip or circuit in the tag device, and includes:

[0049] A receiving module, configured to receive a first fundamental frequency signal sent by a first device.

[0050] A sending module, configured to send a second fundamental frequency signal to the first device based on the first fundamental frequency signal, where the second fundamental frequency signal includes the identification information of the electronic tag tag device.

[0051] The receiving module is further configured to receive a third fundamental frequency signal sent by the first device, where the third fundamental frequency signal is used for positioning detection.

[0052] The sending module is further configured to return a harmonic reflection signal to the first device based on the third fundamental frequency signal, where the harmonic reflection signal is used to determine the position information of the tag device.

[0053] In a possible design, the receiving module is further configured to receive a fourth fundamental frequency signal sent by the first device before receiving the third fundamental frequency signal sent by the first device, where the fourth fundamental frequency signal includes first indication information.

[0054] In another possible design, a processing module is configured to switch from a first operating mode to a second operating mode according to first indication information. The first operating mode is used for rectifying and energy storage, and the second operating mode is used for object finding and positioning.

[0055] In another possible design, a sending module is further configured to, after receiving a fourth fundamental frequency signal sent by a first device, send a fifth fundamental frequency signal to the first device. The fifth fundamental frequency signal includes confirmation information, and the confirmation information is used to indicate that the tag device is communicatively connected to the first device.

[0056] In another possible design, the fourth fundamental frequency signal further includes identification information of the tag device.

[0057] In another possible design, a processing module is further configured to receive a sixth fundamental frequency signal sent by the first device. The sixth fundamental frequency signal includes second indication information, and switch from the second operating mode to the first operating mode according to the second indication information; or switch from the second operating mode to the first operating mode if no indication information from the first device is received within a preset time period after sending a harmonic reflection signal to the first device; wherein the first operating mode is used for rectifying and energy storage, and the second operating mode is used for object finding and positioning.

[0058] In another possible design, the tag device includes a rectifying antenna, and the rectifying antenna includes a fifth receiving antenna and a rectifying circuit.

[0059] In another possible design, a processing module is further configured to receive a first fundamental frequency signal through the fifth receiving antenna; rectify the first fundamental frequency signal through the rectifying circuit to obtain a first stored power.

[0060] In another possible design, a sending module is further configured to send a second fundamental frequency signal to the first device when the first stored power is greater than or equal to a preset threshold.

[0061] In another possible design, the tag device includes an antenna module, and the antenna module includes a fundamental frequency antenna and a harmonic antenna. The fundamental frequency antenna is used for receiving or sending fundamental frequency signals, and the harmonic antenna is used for sending harmonic signals.

[0062] In another possible design, the tag device is a passive electronic tag.

[0063] The operations performed by the identification and positioning device and the beneficial effects can be referred to the method and the beneficial effects described in the second aspect above, and the repeated parts will not be elaborated.

[0064] Fifth aspect, the present application provides an identification and positioning device, which includes a processor and a memory. The memory is used to store a computer program. The processor is used to execute the computer program stored in the memory, so that the identification and positioning device executes the method described in any one of the first aspect.

[0065] Sixth aspect, the present application provides an identification and positioning device, which includes a processor and a memory. The memory is used to store a computer program. The processor is used to execute the computer program stored in the memory, so that the identification and positioning device executes the method described in any one of the second aspect.

[0066] Seventh aspect, an embodiment of the present application provides an identification and positioning system, which includes at least one first device and at least one tag device. The first device is used to execute the steps in the first aspect above, and the tag device is used to execute the steps in the second aspect above.

[0067] Eighth aspect, an embodiment of the present application provides a computer-readable storage medium, in which instructions are stored. When it runs on a computer, it enables the computer to execute the methods in the above aspects.

[0068] Ninth aspect, an embodiment of the present application provides a computer program product containing instructions. When it runs on a computer, it enables the computer to execute the methods in the above aspects.

[0069] Tenth aspect, an embodiment of the present application provides a chip, which includes a processor and a communication interface. The communication interface is used to communicate with external devices or internal devices, and the processor is used to implement the methods in the above aspects.

[0070] In a possible design, the chip may further include a memory, in which a computer program or instructions are stored. The processor is used to execute the computer program or instructions stored in the memory, or other programs or instructions. When the computer program or instructions are executed, the processor is used to implement the methods in the above aspects.

[0071] In another possible design, the chip may be integrated on the first device or the tag device. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the following will describe the drawings required to be used in the embodiments of the present application or the background technology.

[0073] Figure 1 is a schematic diagram based on ultra-wideband (UWB) positioning;

[0074] Figure 2 It is a schematic diagram based on the positioning of active tags;

[0075] Figure 3 It is a schematic diagram based on the positioning of passive tags;

[0076] Figure 4 It is a schematic diagram based on the positioning of fundamental frequency radar;

[0077] Figure 5 It is a schematic diagram based on the positioning of harmonic radar;

[0078] Figure 6 It is a schematic structural diagram of an identification and positioning system provided by an embodiment of the present application;

[0079] Figure 7 It is a schematic structural diagram of a first device provided by an embodiment of the present application;

[0080] Figure 8 It is a schematic structural diagram of a tag device provided by an embodiment of the present application;

[0081] Figure 9 It is a schematic circuit logic diagram of a rectenna provided by an embodiment of the present application;

[0082] Figure 10 It is a schematic flowchart of an identification and positioning method provided by an embodiment of the present application;

[0083] Figure 11 It is a schematic diagram of an application scenario of the identification and positioning system provided by an embodiment of the present application;

[0084] Figure 12 It is a schematic diagram of an interface provided by an embodiment of the present application;

[0085] Figure 13 It is a schematic diagram of an antenna layout provided by an embodiment of the present application;

[0086] Figure 14 It is a schematic diagram of another application scenario of the identification and positioning system provided by an embodiment of the present application;

[0087] Figure 15 It is a schematic diagram of another antenna layout provided by an embodiment of the present application;

[0088] Figure 16 It is a schematic structural diagram of an identification and positioning device provided by an embodiment of the present application;

[0089] Figure 17 It is a schematic structural diagram of another identification and positioning device provided by an embodiment of the present application;

[0090] Figure 18It is a schematic structural diagram of another first device provided by an embodiment of the present application;

[0091] Figure 19 It is a schematic structural diagram of another tag device provided by an embodiment of the present application. Detailed implementation manners

[0092] The following explains some terms involved in the present application to facilitate the understanding of those skilled in the art.

[0093] 1. Rectenna: A microwave rectenna is a way of microwave power transmission (MPT), aiming to convert the microwave signal received by the antenna into direct current, and at the same time requiring it to have high energy conversion efficiency and low ripple voltage. A rectenna mainly consists of a receiving antenna, a pre-rectification low-pass filter (LPF), a rectifying device (usually a diode in some form), and an output through filter.

[0094] 2. Passive tag: Also known as passive electronic tag, passive label, it has no built-in battery and needs to extract the power required for its operation from the radio frequency energy emitted by the reader. Usually, it uses the reflection modulation method to complete the transmission of the electronic tag information to the reader.

[0095] 3. Harmonic radar: It is a radar system that emits a fundamental wave signal, receives the second, third, or even higher-order harmonic / combination wave signals re-radiated from the target, and judges, identifies, and detects the target.

[0096] 4. Supercapacitor: Also known as electrochemical capacitor, electric double layer capacitor, different from traditional chemical power sources, it is a power source with special performance between traditional capacitors and batteries, mainly relying on the electric double layer and redox pseudocapacitance to store electrical energy. During its energy storage process, no chemical reaction occurs, and this energy storage process is reversible. Therefore, the supercapacitor can be charged and discharged hundreds of thousands of times repeatedly.

[0097] The following describes the embodiments of the present application in combination with the drawings in the embodiments of the present application.

[0098] It should be understood that in the description of the present application, "at least one" means one or more, and "a plurality" means two or more. In addition, words such as "first" and "second" are only used for the purpose of distinguishing descriptions unless otherwise specified, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order.

[0099] The following introduces several positioning methods:

[0100] The UWB positioning method integrates UWB chips in the host and the target for communication handshake and data transmission between the two parties, and accurately locates the target according to the UWB ranging principle.

[0101] The active tag positioning method can be implemented through short-range communication solutions such as Bluetooth / Bluetooth Low Energy (BT / BLE), Wireless Fidelity (WIFI), Nearlink, IOT, Long Range Radio (LORA), ZigBee, etc.

[0102] The passive tag positioning method can be implemented by scattering radio signals such as Radio Frequency Identification (RFID) and Near Field Communication (NFC), or by scattering ultrasonic, magnetic, or optical / infrared signals.

[0103] The fundamental frequency radar positioning method can be implemented by modulating Continuous Wave (CW) or Frequency Modulated Continuous Wave (FMCW). The fundamental frequency radar emits a fundamental frequency signal, and the target returns the fundamental frequency signal. By detecting, positioning, and identifying the fundamental frequency signal, the fundamental frequency radar positioning is achieved.

[0104] The harmonic radar positioning method: The host emits a fundamental frequency signal, the target returns a harmonic signal, and the host realizes harmonic radar positioning by detecting, positioning, and identifying the harmonic signal.

[0105] In the existing technical solutions, as Figure 1 shown, Figure 1 is a schematic diagram based on UWB positioning. The host can perform high-precision direction finding and ranging on the target through the UWB chip. Although this solution can achieve high-precision positioning and high-speed data transmission, its power consumption and cost are relatively high, and the target needs to replace the battery regularly or be charged regularly, which limits its wide application.

[0106] In the existing technical solutions, as Figure 2 shown, Figure 2 is a schematic diagram based on active tag positioning. The host can locate the target through BLE or WIFI. This solution has a mature industrial chain and low cost. Using a single host can only test the presence or absence, and cannot perform accurate direction finding and ranging. Moreover, the target still needs external power supply.

[0107] In the existing technical solutions, as Figure 3 shown, Figure 3 is a schematic diagram of passive tag positioning. The host can locate the target through NFC. The target of this solution does not require an external power supply. However, due to the low reflected power, the detection distance is usually relatively short. Moreover, due to the simple structure of the solution and the lack of reliable authentication, the security level is low and the data interaction ability is weak.

[0108] In the existing technical solutions, as Figure 4 shown, Figure 4 is a schematic diagram of fundamental frequency radar positioning. The host sends a fundamental frequency signal to the target and then detects the fundamental frequency signal returned by the target to achieve the positioning of the target. This solution detects all targets and then identifies them through algorithms based on their characteristics. It cannot identify and lock the target in advance, nor can it communicate bidirectionally with the target. Moreover, since environmental stray signals are basically fundamental frequency reflection signals, this solution has a complex external environment and interference.

[0109] In the existing technical solutions, as Figure 5 shown, Figure 5 is a schematic diagram of harmonic radar positioning. The host sends a fundamental frequency signal to the target and then detects the harmonic signal returned by the target to achieve the positioning of the target. By detecting the harmonic signal, this solution can effectively eliminate environmental clutter and improve the detection ability of the host. Moreover, the target does not require an external power supply. However, this solution detects all targets in the environment, without the ability to identify in advance and without the ability to communicate and interact with the target.

[0110] To solve the above technical problems, the embodiments of the present application provide the following solutions.

[0111] As Figure 6 shown, Figure 6 is a schematic structural diagram of an identification and positioning system provided by the embodiments of the present application. The identification and positioning method provided by the present application is applicable to this identification and positioning system. The identification and positioning system includes a first device 601 and M tag devices 602. Specifically, the first device 601 is respectively connected to each of the M tag devices 602, and M is an integer greater than 0. Here, the tag device 602 is a passive electronic tag, and the connection means transmitting instructions and / or data signals. Among them, the detailed descriptions of each module are as follows.

[0112] A first device 601 is configured to send a first fundamental frequency signal to M tag devices 602, where the M tag devices 602 include a target tag device; receive second fundamental frequency signals sent by each of N tag devices 602 among the M tag devices 602, where the second fundamental frequency signals include identification information of each tag device 602, and N is an integer greater than 0 and less than or equal to M; based on the identification information, send a third fundamental frequency signal to the target tag device, where the third fundamental frequency signal is used for positioning detection; receive a harmonic reflection signal returned by the target tag device; and determine the position information of the target tag device according to the third fundamental frequency signal and the harmonic reflection signal.

[0113] It should be understood that in the embodiments of the present application, the first device 601 may also be configured to execute the steps or functions implemented by the first device in the identification and positioning method provided in the present application. For specific details, please refer to the corresponding descriptions hereinafter, and no specific description will be provided here.

[0114] Specifically, the first device 601 or the carrier of the first device 601 is a device with processing capabilities and data transceiver capabilities. For example, the first device 601 or the carrier of the first device 601 may be a smart watch, a computer, a laptop, a tablet computer, a handheld computer, a desktop computer, a mobile phone, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), etc.

[0115] Among them, the first device 601 may generally refer to one of multiple first devices. Only the first device 601 is used as an example in the embodiments of the present application. The first device may be used by one user, or two first devices may be used by different users. The number of the above-mentioned first devices may be more or less. For example, the above-mentioned first devices are several or dozens, or even more. The embodiments of the present application do not limit the number and type of the first devices.

[0116] A tag device 602 is configured to receive the first fundamental frequency signal sent by the first device 601; based on the first fundamental frequency signal, send a second fundamental frequency signal to the first device 601, where the second fundamental frequency signal includes the identification information of the tag device 602; receive the third fundamental frequency signal sent by the first device 601, where the third fundamental frequency signal is used for positioning detection; and based on the third fundamental frequency signal, return a harmonic reflection signal to the first device 601, where the harmonic reflection signal is used to determine the position information of the tag device 602.

[0117] It should be understood that in the embodiments of the present application, the tag device 602 can also be used to execute the steps or functions implemented by the tag device and / or the target tag device in the identification and positioning method provided by the present application. For specific details, please refer to the corresponding descriptions hereinafter, and no specific description will be given here.

[0118] Among them, the tag device 602 can generally refer to one of multiple tag devices. In the embodiments of the present application, only the tag device 602 is used as an example for illustration. The tag device can be installed on an item, or two tag devices can be installed on different items. The number of the above-mentioned tag devices can be more or less. For example, the above-mentioned tag devices are several or dozens, or even more. The embodiments of the present application do not limit the number of tag devices.

[0119] It should be noted that the above-mentioned identification and positioning system can be a system that interacts with users. This system can be a software system, a hardware system, or a system combining software and hardware. The present application does not make specific limitations on this. It should also be noted that Figure 6 only exemplarily shows a structural schematic diagram of the identification and positioning system, and in actual applications, corresponding transformations can be made to the Figure 6 identification and positioning system according to specific situations.

[0120] As Figure 7 shown, Figure 7 is a structural schematic diagram of a first device provided by the embodiments of the present application. The first device includes a first fundamental frequency transceiver circuit 701 and a harmonic radar detection circuit 702. Among them, the detailed descriptions of each module are as follows.

[0121] The first fundamental frequency transceiver circuit 701 is used to receive or transmit fundamental frequency signals.

[0122] Among them, the first fundamental frequency transceiver circuit 701 includes a first baseband circuit, a transmitting channel, a radio frequency switch, a first band-pass filter (BPF), a fundamental frequency antenna, and a receiving channel. The transmitting channel includes an upconverter and a power amplifier (PA), and the receiving channel includes a low noise amplifier (LNA) and a downconverter. The output end of the first baseband circuit is connected to the input end of the transmitting channel, the output end of the transmitting channel is connected to the A end of the radio frequency switch, the C end of the radio frequency switch is connected to one end of the first band-pass filter, the other end of the first band-pass filter is connected to one end of the fundamental frequency antenna, the B end of the radio frequency switch is connected to the input end of the receiving channel, and the output end of the receiving channel is connected to the input end of the first baseband circuit.

[0123] It should be noted that the RF switch and the first band-pass filter are two-way devices and can work properly during the process of transmitting / receiving the baseband signal.

[0124] During the process of transmitting the baseband signal, the baseband signal is generated by the first baseband circuit, up-converted by the up-converter in the transmitting channel, power-amplified by the power amplifier in the transmitting channel, filtered by the first band-pass filter, and then transmitted by the baseband antenna after filtering.

[0125] During the process of receiving the baseband signal, the baseband signal is received by the baseband antenna, filtered by the first band-pass filter, low-noise amplified by the low-noise amplifier in the receiving channel, down-converted by the down-converter in the receiving channel, and then processed by the first baseband circuit after down-conversion.

[0126] The harmonic radar detection circuit 702 is used to receive harmonic signals.

[0127] Among them, the harmonic radar detection circuit 702 includes a harmonic antenna, a second band-pass filter, a mixer and a second baseband circuit. The second band-pass filter is a filter for the harmonic frequency band. The output end of the harmonic antenna is connected to the input end of the second band-pass filter, the output end of the second band-pass filter is connected to the input end of the mixer, and the output end of the mixer is connected to the input end of the second baseband circuit.

[0128] During the process of receiving the harmonic signal, the harmonic signal is received by the harmonic antenna, filtered by the second band-pass filter, and then mixed or autocorrelated by the mixer after filtering.

[0129] Among them, the baseband antenna and the harmonic antenna in the first device can be co-located or separately located; the harmonic antenna can be a two-dimensional harmonic antenna array, usually containing 3 or more channels.

[0130] Optionally, the first device can also replace the baseband antenna and the harmonic antenna in the first device by designing a dual-band antenna. Among them, the dual-band antenna supports receiving / transmitting baseband signals and harmonic signals.

[0131] As Figure 8 shown, Figure 8 is a schematic structural diagram of a tag device provided by an embodiment of the present application. The tag device includes a rectenna 801, a second baseband transceiver circuit 802 and a harmonic reflection circuit 803. Among them, the detailed descriptions of each module are as follows.

[0132] The rectenna 801 is used to rectify the fundamental frequency signal.

[0133] Among them, the rectenna 801 includes a fifth receiving antenna, a low-pass filter, and a rectifying circuit. The rectifying circuit includes a rectifying module, a DC channel, a load circuit, and an energy storage and discharge module. The output end of the fifth receiving antenna is connected to one end of the low-pass filter, the other end of the low-pass filter is connected to the input end of the rectifying module, the output end of the rectifying module is connected to the input end of the DC channel, the output end of the DC channel is connected to the input end of the load circuit, the output end of the load circuit is connected to the input end of the energy storage and discharge module, and the output end of the energy storage and discharge module is connected to the rectifying module.

[0134] It should be noted that the low-pass filter is a two-way device, which is used to select the fundamental frequency signal and the harmonic signal and can work normally during the process of receiving the fundamental frequency signal or transmitting the harmonic signal. In addition, the working modes of the tag device include a first working mode and a second working mode. The first working mode is used for rectifying and energy storage, and the second working mode is used for object searching and positioning.

[0135] When the tag device is in the first working mode, the fundamental frequency signal is received through the fifth receiving antenna, the fundamental frequency signal is filtered through the low-pass filter, and the filtered fundamental frequency signal is rectified through the fifth receiving antenna.

[0136] The second fundamental frequency transceiver circuit 802 is used to receive or transmit the fundamental frequency signal.

[0137] Among them, the second fundamental frequency transceiver circuit 802 includes a fundamental frequency antenna. The fifth receiving antenna in the rectenna 801 and the fundamental frequency antenna in the second fundamental frequency transceiver circuit 802 can be co-located or separately located.

[0138] The harmonic reflection circuit 803 is used to transmit the harmonic signal.

[0139] Among them, the harmonic reflection circuit 803 includes a harmonic antenna.

[0140] When the tag device is in the second working mode, the fundamental frequency signal for positioning detection is received through the fundamental frequency antenna. According to the fundamental frequency signal for positioning detection, the harmonic signal with a doubled frequency is generated through the harmonic reflection circuit 803, the harmonic signal is filtered through the low-pass filter in the rectenna 801, and the filtered harmonic signal is transmitted through the harmonic antenna.

[0141] It should be noted that the tag device can dynamically switch the rectenna 801, the second fundamental frequency transceiver circuit 802, and the harmonic reflection circuit 803 according to the indication information and / or the fundamental frequency signal sent by the first device.

[0142] Among them, the fundamental frequency antenna and the harmonic antenna in the tag device can be co-located or separated. The tag device can also determine whether to use energy storage to amplify the harmonic signal according to actual application requirements, so as to improve the detection distance and accuracy.

[0143] Optionally, the tag device can also use a dual-frequency antenna instead of the fundamental frequency antenna and the harmonic antenna. Specifically, the dual-frequency antenna is used to receive and transmit fundamental frequency signals and harmonic signals.

[0144] It should be noted that the electronic principle implementation logic corresponding to the rectenna 801 is as Figure 9 shown, Figure 9 which is a circuit logic schematic diagram of a rectenna provided by an embodiment of the present application. The rectenna includes a fifth receiving antenna, a matching circuit, a capacitor C1, a capacitor C2, a diode D1, a diode D2, and a resistor RL. Among them, the output end of the fifth receiving antenna is connected to the input end of the matching circuit, the output end of the matching circuit is connected to one end of the capacitor C2, the other end of the capacitor C2 is respectively connected to the positive electrode of the diode D1 and the negative electrode of the diode D2, the negative electrode of the diode D1 is respectively connected to one end of the capacitor C1 and one end of the resistor RL, and the positive electrode of the diode D2, the other end of the capacitor C1, and the other end of the resistor RL are grounded.

[0145] As Figure 10 shown, Figure 10 which is a flowchart of an identification and positioning method provided by an embodiment of the present application. This method is applicable to Figure 6 the identification and positioning system shown, and is specifically implemented by the interaction between the first device 601 and M tag devices 602 in the system. The method includes but is not limited to the following steps:

[0146] Step S1001: The first device sends a first fundamental frequency signal to M tag devices.

[0147] Among them, the M tag devices include the target tag device. The first fundamental frequency signal is used to instruct each of the N tag devices among the M tag devices to send identification information to the first device. The first fundamental frequency signal can be an FMCW modulation wave. M is an integer greater than 0, and N is an integer greater than 0 and less than or equal to M.

[0148] Specifically, the first device generates a first baseband signal through a first baseband transceiver circuit. Further, the first device generates an original baseband signal through a first baseband circuit, then performs up-conversion processing on the original baseband signal through an up-converter in the transmission channel to obtain the up-converted original baseband signal, and then performs power amplification processing on the up-converted original baseband signal through a power amplifier in the transmission channel to obtain the power-amplified original baseband signal. After passing through a radio frequency switch, the power-amplified original baseband signal is filtered through a first band-pass filter to obtain the first baseband signal, and finally, the first baseband signal is sent to each of the M tag devices through a baseband antenna.

[0149] For example, if the M tag devices include tag device 1, tag device 2, and tag device 3, the first device sends the first baseband signal to tag device 1, tag device 2, and tag device 3 respectively.

[0150] Step S1002: N of the M tag devices generate a second baseband signal for each of the N tag devices based on the first baseband signal, and the second baseband signal includes the identification information of each tag device.

[0151] Among them, the identification information is unique and is used to distinguish different tag devices. The identification information can be service set identifier (SSID) information or BSSID information.

[0152] Specifically, each of the N tag devices among the M tag devices receives the first baseband signal and the baseband signal in the environment through a fifth receiving antenna in the rectenna, and then rectifies the first baseband signal and the baseband signal in the environment through a rectifying circuit in the rectenna to obtain a first stored electric quantity; and extracts information from the first baseband signal through a second baseband transceiver circuit to obtain the instruction in the first baseband signal, and then generates a second baseband signal through the second baseband transceiver circuit according to the instruction in the first baseband signal.

[0153] Among them, the instruction in the first baseband signal is used to instruct each of the N tag devices among the M tag devices to send the identification information to the first device; the second baseband signal further includes handshake response information, and the handshake response information is used to instruct the first device to establish a communication handshake with each of the N tag devices.

[0154] For example, if the M tag devices include tag device 1, tag device 2, and tag device 3, the first device sends a first fundamental frequency signal to tag device 1, tag device 2, and tag device 3 respectively, and the first fundamental frequency signal is used to instruct tag device 1 and tag device 2 to send identification information to the first device; then after tag device 1, tag device 2, and tag device 3 receive the first fundamental frequency signal and extract information from the first fundamental frequency signal, tag device 1 sends a second fundamental frequency signal of tag device 1 to the first device, and tag device 2 sends a second fundamental frequency signal of tag device 2 to the first device.

[0155] Step S1003: N tag devices among the M tag devices send the second fundamental frequency signals of each of the N tag devices to the first device.

[0156] Specifically, each of the N tag devices among the M tag devices sends the second fundamental frequency signal to the first device through a fundamental frequency antenna.

[0157] Optionally, when the first stored power is greater than or equal to a preset threshold, each of the N tag devices among the M tag devices sends the second fundamental frequency signal to the first device.

[0158] Wherein, the preset threshold is an empirical parameter.

[0159] Optionally, when the first stored power is less than the preset threshold, each of the N tag devices among the M tag devices continues to receive the fundamental frequency signal in the environment and rectifies it to obtain a second stored power. If the second stored power is greater than or equal to the preset threshold, the second fundamental frequency signal is sent to the first device.

[0160] Step S1004: The first device generates a third fundamental frequency signal based on the identification information of the target tag device.

[0161] Wherein, the third fundamental frequency signal is used for positioning detection, and the third fundamental frequency signal can be a pulse wave or an FMCW modulation wave.

[0162] Specifically, the first device generates the third fundamental frequency signal through a first fundamental frequency transceiver circuit, and the specific generation process refers to step S1001, which will not be elaborated here.

[0163] Optionally, before generating the third fundamental frequency signal, the first device can, based on the identification information of the target tag device, identify in advance that the item corresponding to the target tag device among the M tag devices is the target item, and then authenticate the identity of the target tag device through the identification information of the target tag device. After the identity authentication is passed, a fourth fundamental frequency signal is sent to the target tag device.

[0164] Among them, the fourth fundamental frequency signal is used for the first device to establish a communication handshake with the target tag device. The fourth fundamental frequency signal includes first indication information and the identification information of the target tag device. The first indication information is used to instruct the target tag device to switch from the first working mode to the second working mode. The first working mode is used for rectifying and storing energy, and the second working mode is used for item search and positioning. The identification information is used to instruct a specific tag device to enter mode switching.

[0165] For example, the M tag devices include tag device 1, tag device 2, and tag device 3, and tag device 2 is the target tag device. First, the first device sends the first fundamental frequency signal to tag device 1, tag device 2, and tag device 3 respectively. The first fundamental frequency signal is used to instruct tag device 1, tag device 2, and tag device 3 to send the identification information to the first device. Then the first device receives the identification information of tag device 1, the identification information of tag device 2, and the identification information of tag device 3. Based on the identification information of tag device 2, it pre-identifies the item corresponding to tag device 2 as the target item, and then authenticates the identity of tag device 2 through the identification information of tag device 2. After the identity authentication is passed, it sends the fourth fundamental frequency signal for establishing a communication handshake to tag device 2. Tag device 2 switches from the first working mode to the second working mode according to the fourth fundamental frequency signal. Finally, the first device generates the third fundamental frequency signal for detection and positioning through the first fundamental frequency transceiver circuit.

[0166] Optionally, after sending the fourth fundamental frequency signal to the target tag device, the first device can also receive the fifth fundamental frequency signal sent by the target tag device. The fifth fundamental frequency signal includes confirmation information, and the confirmation information is used to indicate that the target tag device is communicatively connected to the first device. The communicative connection here means that a communication handshake is successfully established.

[0167] Step S1005: The first device sends the third fundamental frequency signal to the target tag device.

[0168] Specifically, the first device sends the third fundamental frequency signal to the target tag device through the fundamental frequency antenna.

[0169] Optionally, during the item search and positioning process, the first device can continuously send or send the third fundamental frequency signal at a predefined time slot to the target tag device.

[0170] Step S1006: The target tag device generates a harmonic reflection signal based on the third fundamental frequency signal.

[0171] Among them, the frequency of the harmonic reflection signal is a multiple of the frequency of the third fundamental frequency signal, and the bandwidth and periodic characteristics of the harmonic reflection signal are the same as those of the third fundamental frequency signal.

[0172] Specifically, the target tag device receives the third fundamental frequency signal through the fundamental frequency antenna, controls the harmonic reflection circuit to turn on, and switches the target tag device from high-efficiency rectification to a state of high-efficiency reflection with low-efficiency rectification; then, according to the third fundamental frequency signal, a harmonic signal of double frequency is generated, and the double-frequency harmonic signal is filtered through a low-pass filter to obtain a harmonic reflection signal.

[0173] Step S1007: The target tag device sends the harmonic reflection signal to the first device.

[0174] Specifically, the target tag device sends the harmonic reflection signal to the first device through the harmonic antenna.

[0175] Step S1008: The first device determines the position information of the target tag device according to the third fundamental frequency signal and the harmonic reflection signal.

[0176] Among them, the position information includes distance information, horizontal measurement information, and vertical measurement information.

[0177] Specifically, the first device receives the harmonic reflection signal through the harmonic antenna, then filters the harmonic reflection signal through the second band-pass filter to obtain the filtered harmonic reflection signal, and then determines the position information of the target tag device according to the third fundamental frequency signal and the filtered harmonic reflection signal. The position information of the target tag device can be determined from the following three aspects, including:

[0178] In the first aspect, in one implementation, the first device can mix or perform autocorrelation processing on the filtered harmonic reflection signal and the double frequency of the third fundamental frequency signal through a mixer to obtain an intermediate frequency signal, and then determine the distance information between the first device and the tag device according to the frequency of the intermediate frequency signal.

[0179] For example, if the third fundamental frequency signal is an FMCW modulation wave, then the harmonic reflection signal is also an FMCW modulation wave, and the distance information satisfies:

[0180] R = (c × T × f b ) / (2 × B2);

[0181] B2 = 2 × B1;

[0182] Among them, R represents the distance information between the first device and the target tag device, c represents the speed of light, T represents the period of the third fundamental frequency signal and the harmonic reflection signal, f b represents the frequency of the intermediate frequency signal, B2 represents the bandwidth of the harmonic reflection signal, and B1 represents the bandwidth of the third fundamental frequency signal.

[0183] In another implementation, the first device may also determine the time delay information between the third fundamental frequency signal and the harmonic reflection signal, and then determine the distance information based on the time delay information.

[0184] For example, the first device may perform distance measurement by the time of flight (TOF) method according to the type of the third fundamental frequency signal. If the third fundamental frequency signal is an FMCW modulated wave, the distance information satisfies:

[0185] R = (c × τ) / 2;

[0186] where R represents the distance information between the first device and the target tag device, c represents the speed of light, and τ represents the time delay information between the third fundamental frequency signal and the harmonic reflection signal.

[0187] In a second aspect, the harmonic antenna includes a first receiving antenna and a second receiving antenna. The first receiving antenna is used to receive the harmonic signal in the first horizontal direction, and the second receiving antenna is used to receive the harmonic signal in the second horizontal direction. The first device receives the harmonic reflection signal through the first receiving antenna; receives the harmonic reflection signal through the second receiving antenna; and determines the horizontal measurement information of the target tag device according to the amplitude-phase difference between the harmonic reflection signal received by the first receiving antenna and the harmonic reflection signal received by the second receiving antenna.

[0188] In a third aspect, the harmonic antenna includes a third receiving antenna and a fourth receiving antenna. The third receiving antenna is used to receive the harmonic signal in the first vertical direction, and the fourth receiving antenna is used to receive the harmonic signal in the second vertical direction. The first device receives the harmonic reflection signal through the third receiving antenna; receives the harmonic reflection signal through the fourth receiving antenna; and determines the vertical measurement information of the target tag device according to the amplitude-phase difference between the harmonic reflection signal received by the third receiving antenna and the harmonic reflection signal received by the fourth receiving antenna.

[0189] It should be noted that the harmonic antenna of the first device must ensure 2 horizontal elements and channels, and 2 vertical elements and channels.

[0190] Among them, the first receiving antenna and the second receiving antenna and the third receiving antenna and the fourth receiving antenna may be the same antenna or different antennas. If the first receiving antenna and the second receiving antenna and the third receiving antenna and the fourth receiving antenna are the same antenna, the harmonic antenna includes 2 channels. After the first receiving antenna and the second receiving antenna receive the harmonic signals in the horizontal direction, in order to multiplex the channels, through switch switching, the third receiving antenna and the fourth receiving antenna are connected to the channels, and then the harmonic signals in the vertical direction are received through the third receiving antenna and the fourth receiving antenna.

[0191] Optionally, if the first device finishes searching for the item, the first device sends a sixth fundamental frequency signal to the target tag device. The sixth fundamental frequency signal includes second indication information. The target tag device switches from the second working mode to the first working mode according to the second indication information.

[0192] Optionally, if the target tag device does not receive the indication information from the first device within a preset time period after sending the harmonic reflection signal to the first device, the target tag device switches from the second working mode to the first working mode.

[0193] Among them, the preset time period can be any time period, and the present application does not make specific limitations.

[0194] As Figure 11 shown, Figure 11 is a schematic diagram of an application scenario of the identification and positioning system provided by an embodiment of the present application. In an indoor application scenario, the indoor identification and positioning system includes a carrier of the first device and at least one tag device. Among them, the at least one tag device includes a target tag device, and the tag device is a passive electronic tag. The carrier of the first device is used to detect, locate, and search for the target item carrying the target tag device.

[0195] As Figure 11As shown, the tag device 1 is installed on the electric fan, the tag device 2 is installed on the remote control, the tag device 3 is installed on the sofa, and the tag device 4 is installed on the key. Using the mobile phone as the carrier of the first device and the key as the target item, the user can, with the help of the computing power and display interface of the mobile phone, realize the lost item indication and route guidance for the key. The specific process includes: The mobile phone sends a first baseband signal to the tag device 1, the tag device 2, the tag device 3, and the tag device 4. The first baseband signal is used to instruct the tag device 1, the tag device 2, the tag device 3, and the tag device 4 to send identification information to the mobile phone. After each tag device receives the first baseband signal, it rectifies the first baseband signal through a rectifying antenna and extracts information from the first baseband signal through a second baseband transceiver circuit. Then, the tag device 1, the tag device 2, the tag device 3, and the tag device 4 send the identification information of each tag device to the mobile phone. After the mobile phone receives the identification information of each tag device, it pre-identifies the tag device 4 as the target tag device from the tag device 1, the tag device 2, the tag device 3, and the tag device 4. According to the identification information of the tag device 4, it sends a fourth baseband signal for establishing a communication handshake to the tag device 4. The tag device 4 switches from the first working mode to the second working mode according to the fourth baseband signal and returns an acknowledgement character (ACK) to the mobile phone to achieve communication handshake and target confirmation. Then the mobile phone sends a third baseband signal for detecting and positioning. The tag device 4 receives the third baseband signal in real time and returns a frequency-doubled harmonic reflection signal to the mobile phone. The mobile phone receives the harmonic reflection signal and, by processing the third baseband signal and the harmonic reflection signal, realizes the calculation of the distance and azimuth of the tag device 4, thereby obtaining the distance and azimuth information of the key.

[0196] Optionally, the first device can stop the lost item search action by approaching in distance or through active control.

[0197] Optionally, if the first device stops the lost item search action, it can send an indication message to the target tag device to cause the target tag device to switch from the second working mode to the first working mode.

[0198] Optionally, if the first device continues the lost item search, the first device can continuously send or send detection signals at predetermined time slots to the target tag device, and then gradually guide the first device to approach and search for the target tag device according to the position change of the target tag device and the first device.

[0199] It should be noted that, compared with the UWB positioning method, the indoor identification and positioning system does not require a battery and charging management; compared with the WIFI / BLE positioning method, the indoor identification and positioning system has higher detection accuracy; compared with the RFID positioning method, the indoor identification and positioning system has a longer detection distance; compared with the radar positioning method, the indoor identification and positioning system can achieve target recognition and support certain data interaction.

[0200] As Figure 12 shown, Figure 12 is a schematic diagram of an interface provided by an embodiment of the present application. When the mobile phone initiates the search for the location of the target tag device, this interface prompts the user to start the lost item search process in text; when the mobile phone detects the location information of the target tag device, this interface displays the azimuth and distance information of the target tag device, and prompts the user's forward direction by means of arrows, text, etc.; when the carrier of the first device detects that the distance from the target tag device is less than a certain distance, for example, it detects that the target item is 1 meter away currently, this interface prompts the user to stop searching for the lost item in text, and prompts the user's forward direction by means of arrows, text, etc.

[0201] Among them, the identification information of each tag device includes but is not limited to SSID information, terminal registration to be managed, or BSSID and other information; the carrier of the first device can also be a tablet computer, a personal computer (PC), a smart screen, etc.; the form of the tag device can be button-shaped, a pendant, an attached label, etc.

[0202] It should be noted that since the indoor lost item search movement speed is low and high-speed switching and refreshing are not required, the first device and the tag device need to prioritize miniaturization and low cost, and can have a certain thickness. Therefore, the fundamental frequency antenna and the harmonic antenna in the first device / tag device can be co-located.

[0203] As Figure 13 shown, Figure 13 is a schematic diagram of an antenna layout provided by an embodiment of the present application. This antenna layout adopts a co-radiator / co-radiation position design, sets the fundamental frequency antenna on one layer board, sets the harmonic antenna on another layer board, and realizes the co-location of the two antennas through the three-dimensional stacked structure of the multi-layer board.

[0204] Among them, since the frequencies of the fundamental frequency signal and the harmonic signal are in a multiple relationship, and the wavelengths and antenna sizes of the two are also in a multiple relationship, it is convenient to design the fundamental frequency antenna and the harmonic antenna with a common radiator / common radiation position, thereby realizing the co-body layout of the two antennas; the harmonic antenna can be a 2R receiver, a 3R receiver or a 4R receiver. If the harmonic antenna is a 2R receiver, the antenna arrangement in two mutually orthogonal directions can be realized by switching through a switch. For example, the antenna arrangement in the horizontal and vertical directions can be realized; the antenna module of the tag device can be arranged on the back shell and around the item.

[0205] Optionally, the harmonic antenna can also be rotated to adapt to the detection plane.

[0206] Such as Figure 14 shown, Figure 14 is another application scenario schematic diagram of the identification and positioning system provided by the embodiment of the present application. In the outdoor application scenario, as Figure 14 shown, the outdoor identification and positioning system includes at least one first device and at least one tag device. Among them, at least one tag device includes a target tag device, and the tag device is a passive electronic tag. The target item carrying the target tag device is detected, positioned and searched through the carrier of one or more first devices. The tag devices in the outdoor application scenario may be arranged on the surfaces of vehicles, ships, etc. Therefore, the tag devices need to prioritize being thin and light, and the size constraints can be relaxed.

[0207] It should be noted that compared with the indoor application scenario, the first device and the tag device in the outdoor application scenario require a longer detection distance, a faster refresh rate and a higher transmission power.

[0208] Among them, the first device and the tag device can be designed with a larger antenna size; the fundamental frequency antenna and the harmonic antenna in the first device / tag device can be separately arranged.

[0209] Such as Figure 15 shown, Figure 15 is a schematic diagram of another antenna layout provided by the embodiment of the present application. This antenna layout uses a physically separated method to separately design the fundamental frequency antenna, the harmonic antenna and the circuit.

[0210] Among them, the first device / tag device can be based on materials such as single-layer flexible boards to arrange the fundamental frequency antenna, the harmonic antenna and the circuit on a single layer board; the harmonic antenna in the first device can be a 1T3R receiver, a 2T4R receiver or an mTnR receiver; the harmonic antenna on the tag device can use multiple antenna elements, or multiple rectifier units and harmonic units work in parallel; the tag device can also use two-dimensional flexible materials to design supercapacitors. By changing the number of channels of the fundamental frequency antenna and the harmonic antenna, the antenna array design and the form, it is possible to better adapt to the outdoor and surface attachment scenarios.

[0211] Optionally, through the cooperation between multiple first devices, the target tag device can be detected and located.

[0212] For example, time division or frequency division can be used to achieve the cooperation between multiple first devices to avoid mutual interference; or the effect of finding objects in a multiple-input multiple-output (MIMO) system can be achieved through data synchronization between multiple first devices.

[0213] Among them, the tag device is by default a passive electronic tag, or can also be an active electronic tag with devices such as a battery / photovoltaic solar energy.

[0214] Optionally, in outdoor object finding applications, such as long-distance detection scenarios like search and rescue, the tag device can be externally powered to perform fundamental frequency communication and amplify the harmonic reflection signal during harmonic reflection, and absorb and store energy through methods such as photovoltaic / wireless power transfer, and then switch to a passive electronic tag after the battery runs out.

[0215] Optionally, if the tag device is an active electronic tag and includes modules and / or circuits for assisting in positioning, such as a global positioning system (GPS), WIFI, cellular, inertial sensors, etc., after the tag device establishes a communication handshake with the first device, it can also send information for assisting in positioning to the first device.

[0216] By adopting the embodiment of the present application, by receiving the second fundamental frequency signal, the identification information of each of the N tag devices is obtained, and then based on the identification information, the target tag device is identified from the N tag devices, which can improve the target recognition ability of the first device. Based on the third fundamental frequency signal and the harmonic reflection signal, the position information of the target tag device is determined, which can improve the precise positioning ability of the first device. Through harmonic communication, environmental interference and data processing complexity can be reduced, the detection distance can be increased, and the energy consumption problem of the tag device is solved through a rectenna without an external power supply, which can reduce costs and power consumption. Moreover, communication interaction can be carried out between the first device and the target tag device. In addition, the hiding and anti-detection capabilities of non-target tag devices can also be improved.

[0217] The method of the embodiment of the present application is elaborated in detail above. The following is an explanation of the device provided by the embodiment of the present application.

[0218] As Figure 16 shown, Figure 16It is a schematic structural diagram of an identification and positioning device provided by an embodiment of the present application. The identification and positioning device can be a first device, or a chip or a processing system in the first device. The device can be used to implement any method and function related to the first device in any of the foregoing embodiments. The device can include a receiving module 1601, a processing module 1602, and a transmitting module 1603. Among them, the detailed descriptions of each module are as follows.

[0219] The transmitting module 1603 is configured to send a first fundamental frequency signal to M electronic tag devices, where the M tag devices include a target tag device, and M is an integer greater than 0.

[0220] The receiving module 1601 is configured to receive a second fundamental frequency signal sent by each of the N tag devices among the M tag devices. The second fundamental frequency signal includes the identification information of each tag device, and N is an integer greater than 0 and less than or equal to M.

[0221] The transmitting module 1603 is further configured to send a third fundamental frequency signal to the target tag device based on the identification information. The third fundamental frequency signal is used for positioning detection.

[0222] The receiving module 1601 is further configured to receive the harmonic reflection signal returned by the target tag device.

[0223] The processing module 1602 is configured to determine the position information of the target tag device according to the third fundamental frequency signal and the harmonic reflection signal.

[0224] Optionally, the transmitting module 1603 is further configured to send a fourth fundamental frequency signal to the target tag device based on the identification information of the target tag device before sending the third fundamental frequency signal to the target tag device. The fourth fundamental frequency signal includes a first indication information, and the first indication information is used to instruct the target tag device to switch from a first working mode to a second working mode. The first working mode is used for rectifying and energy storage, and the second working mode is used for object searching and positioning.

[0225] Optionally, the fourth fundamental frequency signal further includes the identification information of the target tag device.

[0226] Optionally, the receiving module 1601 is further configured to receive a fifth fundamental frequency signal sent by the target tag device after sending the fourth fundamental frequency signal to the target tag device. The fifth fundamental frequency signal includes confirmation information, and the confirmation information is used to indicate that the target tag device is communicatively connected to the first device.

[0227] Optionally, the sending module 1603 is further configured to send a sixth fundamental frequency signal to the target tag device, where the sixth fundamental frequency signal includes second indication information for instructing the target tag device to switch from the second working mode to the first working mode. The first working mode is for rectifying and storing energy, and the second working mode is for object searching and positioning.

[0228] Optionally, the position information includes distance information.

[0229] Optionally, the processing module 1602 is further configured to process the third fundamental frequency signal and the harmonic reflection signal to obtain an intermediate frequency signal, and determine the distance information according to the frequency of the intermediate frequency signal; or determine the time delay information between the third fundamental frequency signal and the harmonic reflection signal, and determine the distance information according to the time delay information.

[0230] Optionally, the first device includes an antenna module, and the antenna module includes a fundamental frequency antenna and a harmonic antenna. The fundamental frequency antenna is used to receive or send a fundamental frequency signal, and the harmonic antenna is used to receive a harmonic signal.

[0231] Optionally, the harmonic antenna includes a first receiving antenna and a second receiving antenna. The first receiving antenna is used to receive harmonic signals in the first horizontal direction, and the second receiving antenna is used to receive harmonic signals in the second horizontal direction.

[0232] Optionally, the position information further includes horizontal measurement information.

[0233] Optionally, the processing module 1602 is further configured to receive a harmonic reflection signal through the first receiving antenna; receive a harmonic reflection signal through the second receiving antenna; and determine the horizontal measurement information according to the amplitude-phase difference between the harmonic reflection signal received by the first receiving antenna and the harmonic reflection signal received by the second receiving antenna.

[0234] Optionally, the harmonic antenna includes a third receiving antenna and a fourth receiving antenna. The third receiving antenna is used to receive harmonic signals in the first vertical direction, and the fourth receiving antenna is used to receive harmonic signals in the second vertical direction.

[0235] Optionally, the position information further includes vertical measurement information.

[0236] Optionally, the processing module 1602 is further configured to receive a harmonic reflection signal through the third receiving antenna; receive a harmonic reflection signal through the fourth receiving antenna; and determine the vertical measurement information according to the amplitude-phase difference between the harmonic reflection signal received by the third receiving antenna and the harmonic reflection signal received by the fourth receiving antenna.

[0237] It should be noted that the implementation of each module can also correspond to the corresponding description of the method embodiment shown in Figure 10 Execute the methods and functions performed by the first device in the above embodiments.

[0238] As Figure 17 shown Figure 17 is a schematic structural diagram of another identification and positioning device provided by an embodiment of the present application. The identification and positioning device may be a tag device, or a chip or a processing system in the tag device. The device may be used to implement any method and function related to the tag device and / or the target tag device in any of the foregoing embodiments. The device may include a receiving module 1701, a processing module 1702, and a transmitting module 1703. Among them, the detailed descriptions of each module are as follows.

[0239] The receiving module 1701 is configured to receive a first fundamental frequency signal sent by a first device.

[0240] The transmitting module 1703 is configured to send a second fundamental frequency signal to the first device based on the first fundamental frequency signal. The second fundamental frequency signal includes identification information of the electronic tag tag device.

[0241] The receiving module 1701 is further configured to receive a third fundamental frequency signal sent by the first device. The third fundamental frequency signal is used for positioning detection.

[0242] The transmitting module 1703 is further configured to return a harmonic reflection signal to the first device based on the third fundamental frequency signal. The harmonic reflection signal is used to determine the position information of the tag device.

[0243] Optionally, the receiving module 1701 is further configured to receive a fourth fundamental frequency signal sent by the first device before receiving the third fundamental frequency signal sent by the first device. The fourth fundamental frequency signal includes first indication information.

[0244] Optionally, the processing module 1702 is configured to switch from a first working mode to a second working mode according to the first indication information. The first working mode is used for rectifying and energy storage, and the second working mode is used for object searching and positioning.

[0245] Optionally, the transmitting module 1703 is further configured to send a fifth fundamental frequency signal to the first device after receiving the fourth fundamental frequency signal sent by the first device. The fifth fundamental frequency signal includes confirmation information. The confirmation information is used to indicate that the tag device is communicatively connected to the first device.

[0246] Optionally, the fourth fundamental frequency signal further includes identification information of the tag device.

[0247] Optionally, the receiving module 1701 is further configured to receive a sixth fundamental frequency signal sent by the first device. The sixth fundamental frequency signal includes second indication information.

[0248] Optionally, the processing module 1702 is further configured to switch from the second working mode to the first working mode according to the second indication information; or switch from the second working mode to the first working mode if the indication information of the first device is not received within a preset time period after the harmonic reflection signal is sent to the first device; wherein the first working mode is used for rectification and energy storage, and the second working mode is used for object finding and positioning.

[0249] Optionally, the tag device includes a rectenna, and the rectenna includes a fifth receiving antenna and a rectification circuit.

[0250] Optionally, the processing module 1702 is further configured to receive a first fundamental frequency signal through the fifth receiving antenna; perform rectification processing on the first fundamental frequency signal through the rectification circuit to obtain a first stored power.

[0251] Optionally, the sending module 1703 is further configured to send a second fundamental frequency signal to the first device when the first stored power is greater than or equal to a preset threshold.

[0252] Optionally, the tag device includes an antenna module, and the antenna module includes a fundamental frequency antenna and a harmonic antenna. The fundamental frequency antenna is used to receive or send a fundamental frequency signal, and the harmonic antenna is used to send a harmonic signal.

[0253] Optionally, the tag device is a passive electronic tag.

[0254] It should be noted that the implementation of each module can also correspond to the corresponding description of the method embodiment shown in Figure 10 Execute the methods and functions performed by the tag device and / or the target tag device in the above embodiments.

[0255] Figure 18 This is a schematic structural diagram of another first device provided by the embodiment of the present application. This first device can be applied to a system as shown in Figure 6 Execute the functions of the first device in the above method embodiments, or implement the steps or processes executed by the first device in the above method embodiments.

[0256] As shown in Figure 18 This first device includes a processor 1801 and a transceiver 1802. Optionally, the first device further includes a memory 1803. Among them, the processor 1801, the transceiver 1802, and the memory 1803 can communicate with each other through an internal connection path to transmit control and / or data signals. The memory 1803 is used to store a computer program, and the processor 1801 is used to call and run the computer program from the memory 1803 to control the transceiver 1802 to send and receive signals. Optionally, the first device may further include an antenna for sending the uplink data or uplink control signaling output by the transceiver 1802 through a wireless signal.

[0257] The above-mentioned processor 1801 and the memory 1803 can be integrated into a processing device. The processor 1801 is used to execute the program code stored in the memory 1803 to implement the above functions. Specifically, in implementation, the memory 1803 can also be integrated into the processor 1801 or be independent of the processor 1801. The processor 1801 can correspond to Figure 16 the processing module in

[0258] The above-mentioned transceiver 1802 can correspond to Figure 16 the sending module and the receiving module in

[0259] It should be understood that Figure 18 the first device shown can implement Figure 10 each process related to the first device in the method embodiment shown. The operations and / or functions of each module in the first device are respectively for implementing the corresponding processes in the above method embodiment. For details, reference can be made to the description in the above method embodiment. To avoid repetition, the detailed description is appropriately omitted here.

[0260] The above-mentioned processor 1801 can be used to execute the actions implemented inside the first device described in the previous method embodiment, while the transceiver 1802 can be used to execute the actions of the first device sending to or receiving from the tag device described in the previous method embodiment. For details, please refer to the description in the previous method embodiment and will not be elaborated here.

[0261] Among them, the processor 1801 can be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field-programmable gate array (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute various exemplary logical blocks, modules, and circuits described in combination with the disclosure of this application. The processor 1801 can also be a combination that implements computing functions, such as a combination including one or more microprocessors, a combination of a digital signal processor and a microprocessor, and so on. The communication bus 1804 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, Figure 18It is only represented by a thick line, but it does not mean that there is only one bus or one type of bus. The communication bus 1804 is used to implement the connection and communication between these components. Among them, in the embodiment of the present application, the transceiver 1802 is used to communicate signaling or data with other node devices. The memory 1803 may include volatile memory, such as nonvolatile random access memory (NVRAM), phase change RAM (PRAM), magnetoresistive RAM (MRAM), etc., and may also include nonvolatile memory, such as at least one disk storage device, electrically erasable programmable read-only memory (EEPROM), flash memory devices, such as NOR flash memory or NAND flash memory, semiconductor devices, such as solid state disk (SSD), etc. The memory 1803 may also be at least one storage device located far from the aforementioned processor 1801. A set of computer program codes or configuration information may also be stored in the memory 1803. The processor 1801 may also execute the programs stored in the memory 1803. The processor may cooperate with the memory and the transceiver to execute any method and function of the first device in the above-mentioned embodiment of the present application.

[0262] Figure 19 It is a schematic structural diagram of another tag device provided by the embodiment of the present application. This tag device can be applied to a system as shown in Figure 6 to execute the functions of the tag device in the above method embodiment, or implement the steps or processes executed by the tag device in the above method embodiment.

[0263] As Figure 19 shown, this tag device includes a processor 1901 and a transceiver 1902. Optionally, this tag device further includes a memory 1903. Among them, the processor 1901, the transceiver 1902, and the memory 1903 can communicate with each other through an internal connection path to transmit control and / or data signals. The memory 1903 is used to store computer programs, and the processor 1901 is used to call and run the computer programs from the memory 1903 to control the transceiver 1902 to transmit and receive signals. Optionally, the tag device may further include an antenna for transmitting the uplink data or uplink control signaling output by the transceiver 1902 through a wireless signal.

[0264] The above-mentioned processor 1901 and the memory 1903 can be integrated into a processing device. The processor 1901 is used to execute the program code stored in the memory 1903 to implement the above functions. Specifically, in implementation, the memory 1903 can also be integrated into the processor 1901 or be independent of the processor 1901. The processor 1901 can correspond to Figure 17 the processing module in

[0265] The above-mentioned transceiver 1902 can correspond to Figure 17 the receiving module and the sending module in, and can also be referred to as a transceiver unit or a transceiver module. The transceiver 1902 can include a receiver (or a receiver, receiving circuit) and a transmitter (or a transmitter, transmitting circuit). Among them, the receiver is used to receive signals, and the transmitter is used to transmit signals.

[0266] It should be understood that Figure 19 the tag device shown can implement Figure 10 each process related to the tag device in the method embodiment shown. The operations and / or functions of each module in the tag device are respectively for implementing the corresponding processes in the above method embodiment. For details, please refer to the description in the above method embodiment. To avoid repetition, the detailed description is appropriately omitted here.

[0267] The above-mentioned processor 1901 can be used to execute the actions implemented inside the tag device described in the previous method embodiment, and the transceiver 1902 can be used to execute the actions of the tag device sending to or receiving from the first device described in the previous method embodiment. For details, please refer to the description in the previous method embodiment, and it will not be elaborated here.

[0268] Among them, the processor 1901 can be various types of processors mentioned above. The communication bus 1904 can be a PCI bus or an EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the sake of convenience of representation, Figure 19 only a thick line is shown in

[0269] The embodiments of the present application further provide a chip, which includes a processor and a communication interface. The communication interface is used to communicate with external devices or internal devices, and the processor is used to implement the methods in the above aspects.

[0270] In a possible design, the chip may further include a memory, in which computer programs or instructions are stored. The processor is used to execute the computer programs or instructions stored in the memory, or other programs or instructions. When the computer programs or instructions are executed, the processor is used to implement the methods in the above aspects.

[0271] In another possible design, the chip may be integrated on a first device or a tag device.

[0272] The embodiments of the present application further provide a processor, which is used to be coupled with a memory and execute any method and function related to the first device or the tag device in any of the above embodiments.

[0273] The embodiments of the present application further provide a computer program product containing instructions, which, when running on a computer, causes the computer to execute any method and function related to the first device or the tag device in any of the above embodiments.

[0274] The embodiments of the present application further provide a device, which is used to execute any method and function related to the first device or the tag device in any of the above embodiments.

[0275] The embodiments of the present application further provide an identification and positioning system, which includes at least one first device and at least one tag device involved in any of the above embodiments.

[0276] Those skilled in the art can clearly understand that for the convenience and conciseness of description, the specific working processes of the above-described identification and positioning device, units or modules within the device can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.

[0277] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from a website, computer, server, or data center to another website, computer, server, or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more integrated available media. The available medium can be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid state disk (SSD)), etc.

[0278] It should be understood that the "and / or" appearing in the embodiments of the present application is merely a relationship describing associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone.

[0279] It should be understood that in the embodiments of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information.

[0280] It should be understood that the symbol " / " appearing in the embodiments of the present application can represent an "or" relationship between the associated objects before and after. In addition, the symbol " / " can also represent a division sign, that is, perform a division operation. For example, A / B can represent A divided by B.

[0281] It can be understood that in the embodiments of the present application, the first device and / or the tag device can execute some or all of the steps in the embodiments of the present application. These steps or operations are only examples. In the embodiments of the present application, other operations or various modifications of the operations can also be executed. In addition, the various steps can be executed in different orders presented in the embodiments of the present application, and it is possible not to execute all the operations in the embodiments of the present application.

[0282] The specific embodiments described above further elaborate in detail the objective, technical solution and beneficial effects of the present application. Any modifications, equivalent replacements, improvements, etc. made within the principle of the present application shall be included within the protection scope of the present application.

Claims

1. A recognition and positioning method, characterized in that, Including: Sending a first fundamental frequency signal to M electronic tag devices, where the M tag devices include a target tag device, and M is an integer greater than 0; Receiving a second fundamental frequency signal sent by each of N tag devices among the M tag devices, where the second fundamental frequency signal includes the identification information of each tag device, and N is an integer greater than 0 and less than or equal to M; Based on the identification information, sending a third fundamental frequency signal to the target tag device, where the third fundamental frequency signal is used for positioning detection; Receiving the harmonic reflection signal returned by the target tag device; Determining the position information of the target tag device according to the third fundamental frequency signal and the harmonic reflection signal.

2. The method according to claim 1, wherein Before sending the third fundamental frequency signal to the target tag device based on the identification information, it further includes: Based on the identification information of the target tag device, sending a fourth fundamental frequency signal to the target tag device, where the fourth fundamental frequency signal includes a first indication information for indicating the target tag device to switch from a first working mode to a second working mode, the first working mode is for rectifying and storing energy, and the second working mode is for item finding and positioning.

3. The method according to claim 2, wherein After sending the fourth fundamental frequency signal to the target tag device, it further includes: Receiving a fifth fundamental frequency signal sent by the target tag device, where the fifth fundamental frequency signal includes a confirmation information for indicating that the target tag device is communicatively connected to the first device.

4. The method according to claim 2 or 3, characterized in that, The fourth fundamental frequency signal further includes the identification information of the target tag device.

5. The method according to any one of claims 1 to 4, characterized in that, The method further includes: Sending a sixth fundamental frequency signal to the target tag device, where the sixth fundamental frequency signal includes a second indication information for indicating the target tag device to switch from the second working mode to the first working mode, the first working mode is for rectifying and storing energy, and the second working mode is for item finding and positioning.

6. The method according to any one of claims 1-5, characterized in that The position information includes distance information; determining the position information of the target tag device according to the third fundamental frequency signal and the harmonic reflection signal includes: Processing the third fundamental frequency signal and the harmonic reflection signal to obtain an intermediate frequency signal, and determining the distance information according to the frequency of the intermediate frequency signal; or Determining the time delay information between the third fundamental frequency signal and the harmonic reflection signal, and determining the distance information according to the time delay information.

7. The method according to any one of claims 1 to 6, characterized in that, The first device includes an antenna module, and the antenna module includes a fundamental frequency antenna and a harmonic antenna. The fundamental frequency antenna is used for receiving or sending fundamental frequency signals, and the harmonic antenna is used for receiving harmonic signals.

8. The method according to claim 7, wherein The harmonic antenna includes a first receiving antenna and a second receiving antenna. The first receiving antenna is used for receiving harmonic signals in a first horizontal direction, and the second receiving antenna is used for receiving harmonic signals in a second horizontal direction.

9. The method according to claim 8, wherein The position information further includes horizontal determination information; the method further includes: Receiving the harmonic reflection signal through the first receiving antenna; Receiving the harmonic reflection signal through the second receiving antenna; Determine the horizontal measurement information based on the amplitude-phase difference between the harmonic reflection signals received by the first receiving antenna and the harmonic reflection signals received by the second receiving antenna.

10. The method according to claim 7, wherein The harmonic antenna includes a third receiving antenna and a fourth receiving antenna. The third receiving antenna is used to receive harmonic signals in a first vertical direction, and the fourth receiving antenna is used to receive harmonic signals in a second vertical direction.

11. The method according to claim 10, wherein The position information further includes vertical measurement information; the method further includes: Receive the harmonic reflection signal through the third receiving antenna; Receive the harmonic reflection signal through the fourth receiving antenna; Determine the vertical measurement information based on the amplitude-phase difference between the harmonic reflection signals received by the third receiving antenna and the harmonic reflection signals received by the fourth receiving antenna.

12. A recognition and positioning method, characterized in that, Includes: Receive a first fundamental frequency signal sent by a first device; Based on the first fundamental frequency signal, send a second fundamental frequency signal to the first device. The second fundamental frequency signal includes identification information of an electronic tag (tag) device; Receive a third fundamental frequency signal sent by the first device. The third fundamental frequency signal is used for positioning detection; Based on the third fundamental frequency signal, return a harmonic reflection signal to the first device. The harmonic reflection signal is used to determine the position information of the tag device.

13. The method according to claim 12, characterized in that, Before receiving the third fundamental frequency signal sent by the first device, it further includes: Receive a fourth fundamental frequency signal sent by the first device. The fourth fundamental frequency signal includes first indication information; According to the first indication information, switch from a first working mode to a second working mode. The first working mode is used for rectifying and energy storage, and the second working mode is used for item search and positioning.

14. The method according to claim 13, wherein After receiving the fourth fundamental frequency signal sent by the first device, it further includes: Send a fifth fundamental frequency signal to the first device. The fifth fundamental frequency signal includes confirmation information. The confirmation information is used to indicate that the tag device is communicatively connected to the first device.

15. The method according to claim 13 or 14, characterized in that, The fourth fundamental frequency signal further includes the identification information of the tag device.

16. The method according to any one of claims 12-15, characterized in that, The method further includes: Receive a sixth fundamental frequency signal sent by the first device. The sixth fundamental frequency signal includes second indication information. According to the second indication information, switch from the second working mode to the first working mode; or If no indication information from the first device is received within a preset time period after sending the harmonic reflection signal to the first device, then switch from the second working mode to the first working mode; Wherein, the first working mode is used for rectifying and energy storage, and the second working mode is used for item search and positioning.

17. The method according to any one of claims 12-16, characterized in that, The tag device includes a rectifying antenna. The rectifying antenna includes a fifth receiving antenna and a rectifying circuit; the method further includes: Receive the first fundamental frequency signal through the fifth receiving antenna; Rectify the first fundamental frequency signal through the rectifying circuit to obtain a first stored charge.

18. The method according to claim 17, wherein The sending the second fundamental frequency signal to the first device based on the first fundamental frequency signal includes: When the first stored charge is greater than or equal to a preset threshold, send the second fundamental frequency signal to the first device.

19. The method according to any one of claims 12-18, characterized in that, The tag device includes an antenna module, and the antenna module includes a fundamental frequency antenna and a harmonic antenna. The fundamental frequency antenna is used to receive or transmit fundamental frequency signals, and the harmonic antenna is used to transmit harmonic signals.

20. The method according to any one of claims 12-19, characterized in that, The tag device is a passive electronic tag.

21. An identification and positioning system, characterized in that, The identification and positioning system includes a first device and a tag device. The first device is used to execute the method described in any one of claims 1-11, and the tag device is used to execute the method described in any one of claims 12-20.

22. An identification and positioning device, characterized in that, The identification and positioning device includes a processor and a memory. The memory is used to store a computer program, and the processor is used to call the computer program to execute the method described in any one of claims 1-11.

23. An identification and positioning device, characterized in that, The identification and positioning device includes a processor and a memory. The memory is used to store a computer program, and the processor is used to call the computer program to execute the method described in any one of claims 12-20.

24. A computer-readable storage medium, characterized in that, For storing a computer program, when the computer program runs on a computer, it causes the computer to execute the method described in any one of claims 1-11 or any one of claims 12-20.

25. A chip, characterized in that, The chip includes a processor and a communication interface. The communication interface is used to communicate with external or internal devices, and the processor is used to implement the method described in any one of claims 1-11 or any one of claims 12-20.

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