Detection method, detection device and wearable device based on backscattering

Abstract

The present application relates to a backscatter-based detection method, detection equipment and wearable device, the method is applied to the detection equipment, the detection equipment includes an antenna, a transmitter, a receiver and a processor, the method includes: the detection equipment receives a signal transmitted by a first device through a receiver, the signal received by the detection equipment has a first frequency; wherein the signal transmitted by the first device is a signal transmitted to the detection equipment through an antenna using a backscatter transmitter, and during the signal transmission process, the first device switches the antenna matching state at a second frequency; the detection equipment transmits a carrier CW through an antenna using a transmitter during the process of receiving the signal transmitted by the first device; the processor of the detection equipment determines vital sign detection information based on the first frequency, the second frequency and the frequency of the carrier CW.

Description

Background Art

[0002] In electronic products, vital signs recognition functions have become quite common. For example, biometric features (fingerprints, irises, voiceprints, faces, etc.) are used to identify specific users and unlock electronic products. Some new smart devices can also monitor patients' vital signs such as heart rate, blood pressure, blood oxygen content and other indicators to track health and provide reminders.

[0003] However, at present, the vast majority of electronic products mainly use special sensors to collect and identify vital signs information, and adopt communication standards and algorithms to achieve this. Not only are the overall hardware and software costs high, but there may also be the following disadvantages: Common identity recognition applications mostly focus on the "first" opening function, such as using face recognition, fingerprint recognition, iris recognition or voice recognition to achieve unlocking, decryption payment and other functions, aiming to achieve "one-time recognition". Since continuous identity recognition cannot be achieved, if the user needs to be confirmed again, biometric recognition needs to be performed again, which will disrupt the smoothness of the user's ongoing work. At present, face recognition and computer vision algorithms can be used for continuous identity recognition for a certain period of time, but face recognition technology using cameras will expose user privacy and seriously affect the enthusiasm for use. In addition, computer vision technology is affected by factors such as environment, light, and obstructions. The algorithm is complex and time-consuming. The reliability and timeliness of the recognition results need to be improved, and there are limitations in privacy and technical application. Summary of the invention

[0004] In view of this, embodiments of the present application provide a detection method, a detection device, and a wearable device based on backscattering.

[0005] An embodiment of the present application provides a backscatter-based detection method, which is applied to a detection device, wherein the detection device includes an antenna, a transmitter, a receiver and a processor, and the method includes: the detection device receives a signal transmitted by a first device through a receiver, and the signal received by the detection device has a first frequency; wherein the signal transmitted by the first device is a signal transmitted to the detection device through an antenna using a backscatter transmitter, and during the signal transmission process, the first device switches the antenna matching state to a second frequency; the detection device transmits a carrier CW through an antenna using a transmitter during the process of receiving the signal transmitted by the first device; the processor of the detection device determines vital sign detection information based on the first frequency, the second frequency and the frequency of the carrier CW.

[0006] An embodiment of the present application provides a backscatter-based detection method, which is applied to a wearable device, wherein the wearable device includes an antenna and a backscatter transmitter. The method includes: the wearable device uses the backscatter transmitter to transmit a signal to the detection device through the antenna, and during the signal transmission process, the wearable device switches the antenna matching state at a second frequency.

[0007] The present application also provides a detection device, including:

[0008] A receiver, configured to receive a signal transmitted by a first device, wherein the signal received by the detection device has a first frequency; wherein the signal transmitted by the first device is a signal transmitted to the detection device via an antenna using a backscatter transmitter, and during the signal transmission process, the first device switches the antenna matching state at a second frequency;

[0009] A transmitter, configured to transmit a carrier wave CW through an antenna during the process of receiving a signal transmitted by the first device;

[0010] The detection information determination module is used to determine vital sign detection information based on the first frequency, the second frequency and the frequency of the carrier CW.

[0011] The present application also provides a wearable device, including:

[0012] The backscatter transmitter is used to transmit a signal to the detection device through an antenna, and during the signal transmission process, the wearable device switches the antenna matching state at a second frequency.

[0013] An embodiment of the present application also provides a detection device, including: an antenna, a transmitter, a receiver, a processor and a memory, wherein the memory is used to store a computer program, and the processor calls and runs the computer program stored in the memory to execute the method described above.

[0014] An embodiment of the present application also provides a wearable device, including: an antenna, a receiver, a backscatter transmitter, a processor and a memory, wherein the memory is used to store a computer program, and the processor calls and runs the computer program stored in the memory to execute the method described above.

[0015] An embodiment of the present application also provides a chip, including: a processor, used to call and run a computer program from a memory, so that a device equipped with the chip executes the method described above.

[0016] An embodiment of the present application also provides a computer-readable storage medium for storing a computer program, wherein the computer program enables a computer to execute the method as described above.

[0017] An embodiment of the present application also provides a computer program product, including computer program instructions, wherein the computer program instructions enable a computer to execute the method as described above.

[0018] The embodiment of the present application also provides a computer program, which enables a computer to execute the method as described above.

[0019] In the embodiments of the present application, the wearable device is carried by a living being, such as a human body, and can transmit the vital signs information of the human body within a certain period of time to a detection device, thereby realizing continuous monitoring of important vital signs of the living being, such as heartbeat, breathing, etc., and the monitoring process will not disclose personal privacy; the wearable device transmits the vital signs information to the detection device by backscattering, does not require special sensors to collect information, and has low hardware costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram schematically shows a heart beat spectrum measured by a medical device.

[0021] Figure 2 It is a flowchart of the detection method of the detection device of the embodiment of the present application.

[0022] Figure 3 It is a flowchart of the detection method of the wearable device according to the embodiment of the present application.

[0023] Figure 4 It is a schematic structural block diagram of a wearable device according to an embodiment of the present application.

[0024] Figure 5 It is a schematic structural block diagram of a chip of a wearable device according to an embodiment of the present application.

[0025] Figure 6 It is a schematic structural block diagram of a detection device according to an embodiment of the present application.

[0026] Figure 7 It is a schematic diagram of an application scenario of an embodiment of the present application.

[0027] Figure 8 It is a schematic structural block diagram of another detection device according to an embodiment of the present application.

[0028] Fig. 9 It is a schematic structural block diagram of another wearable device according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0030] The technical scheme of the embodiment of the present application will be described below in conjunction with the accompanying drawings of the embodiment of the present application. Wherein, the various details of the embodiment of the present application are described to help understand, only as an exemplary implementation, those skilled in the art should be aware that various changes or modifications can be made to the specific implementation described, but will not violate the principle and spirit of the embodiment of the present application, so these changes and modifications all fall within the protection scope of the embodiment of the present application. In addition, for clarity and simplicity, the description of some known functions and structures is omitted in the description of the specific implementation, which does not affect the implementation of the embodiment of the present application. The various embodiments of the present application described herein, in the absence of mutual exclusion, different embodiments can be implemented in any combination to obtain basic and / or further superimposed beneficial technical effects.

[0031] The term "and / or" in this article is used to describe the association relationship between multiple associated objects, for example, to represent three possible association relationships between two associated objects. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0032] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the various processes involved does not mean the order of execution. The execution order of each process is determined by its function and internal logic. Therefore, the size of the serial number does not constitute a special limitation on the implementation process of the embodiments of the present application.

[0033] In the description of the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between two items, or an association relationship between the two items, or a relationship between indication and being indicated, configuration and being configured, and the like.

[0034] Before describing the embodiments of the present application, a brief introduction to backscattering technology is first given. Backscattering technology is based on radar technology in theory and application. Backscattering technology utilizes the concept of radar cross section (RCS) in radar principles. Simply put, when an electromagnetic wave encounters a space target, part of its energy is absorbed by the target, and the other part is scattered in all directions with different intensities. Of the scattered energy, a part is reflected back to the transmitting antenna and received by the transmitting antenna (so the transmitting antenna is also a receiving antenna). The received signal is amplified and processed to obtain relevant information about the target. In a backscattering system, the frequency of the electromagnetic wave reflected by the target is related to the radar cross section RCS of the target, and the size of the RCS of the target is related to factors such as the size, shape, material, and distance of the target from the radar.

[0035] Based on the above theoretical basis, the embodiment of the present application proposes a method for detecting vital signs information based on backscattering. The main idea of ​​the method is to realize the change of RCS by actively changing the antenna impedance matching of the device with backscattering function, and the frequency change of the reflected signal depends on the change of RCS. Therefore, by operating the frequency change of RCS, the carrier's transmission signal can be encoded, so that the target signal can be identified among many reflected signals; in addition, in practice, since the vital signs information of the human body, such as breathing and heartbeat, is a periodic motion, Figure 1 The heartbeat spectrum measured by the medical device is shown. The heartbeat is a periodic movement, which will cause slight changes in the overall body shape of the human body. If the human body carries a device with a backscattering function, the periodic changes in the human body's vital signs will change the distance between the devices. The greater the distance, the weaker the backscattering signal. By collecting and analyzing the strength of the target reflection signal, the target person's vital sign information can be obtained, thereby achieving the purpose of vital sign detection of the human body.

[0036] Based on the above ideas, the present application embodiment provides a detection method based on backscattering, which is applied to a detection device, wherein the detection device includes an antenna, a transmitter and a receiver, and refers to Figure 2 , the method comprising:

[0037] S101, a detection device receives a signal transmitted by a first device through a receiver, wherein the signal received by the detection device has a first frequency; wherein the signal transmitted by the first device is a signal transmitted to the detection device through an antenna using a backscatter transmitter, and during the signal transmission process, the first device switches the antenna matching state at a second frequency;

[0038] S102, the detection device uses a transmitter to transmit a carrier CW through an antenna during the process of receiving a signal transmitted by the first device;

[0039] S103: The processor of the detection device determines vital sign detection information based on the first frequency, the second frequency, and the frequency of the carrier CW.

[0040] The detected device and the first device in the embodiments of the present application can both be designed as wearable devices, such as cards that can be sewn into clothing, wearable bracelets, watches or decorations, etc. Since no special sensors are required to collect information, the hardware cost can be reduced. The wearable device is carried by a living organism such as a human body. Based on the backscattering technology, the wearable device can transmit the vital signs information of the human body within a certain period of time to the detection device, thereby realizing continuous monitoring of important vital signs of the living organism such as heartbeat, breathing, etc., and the monitoring process is not easy to leak personal privacy.

[0041] In an embodiment of the present application, optionally, before the detection device receives a signal transmitted by a first device through a receiver, the method further includes: the detection device sends a request message to at least one device under test, the request message including the identity information of the first device, and the request message is used to request the first device to send vital sign detection information.

[0042] In an embodiment of the present application, optionally, after receiving the signal transmitted by the first device, the detection device sends a reset signal to the at least one device under test, wherein the reset signal is used to instruct the at least one device under test to restore to a default state, in which the at least one device under test waits to receive the next request information.

[0043] For the next request for information, the same processing method as above can be used to obtain the detection information of the corresponding wearable device, thereby obtaining the vital signs information of different users, and realizing accurate identification of each person in a multi-person scene or environment.

[0044] In an embodiment of the present application, optionally, the signal received by the detection device includes first information, and the frequency of the first information is different from the second frequency; the detection device can confirm the identity of the first device based on the first information.

[0045] Through the above method, the detection device and the wearable device can confirm the identity multiple times through the first information. For example, the first information includes the ID of the wearable device. When receiving the reflected signal, the detection device can receive the ID of the currently communicating wearable device, and the detection device can confirm the identity of the wearable device accordingly. Sending the first information multiple times can achieve multiple identity confirmations, and identity verification can be performed without interrupting the user's current work to ensure the accuracy of the information source.

[0046] In an embodiment of the present application, optionally, the detection device determines vital sign detection information based on the first frequency, the second frequency and the frequency of the carrier CW, including: the detection device processes the first frequency, the second frequency and the frequency of the carrier CW by physical filtering and / or digital filtering to determine the vital sign detection information.

[0047] In an embodiment of the present application, optionally, the vital sign detection information includes a heart beat frequency and a respiratory frequency; the detection device determines the vital sign detection information based on the first frequency, the second frequency and the frequency of the carrier CW, including: the detection device determines the heart beat frequency f according to the following formula heart and the respiratory rate is f resp :

[0048] freceived =f c +f bs +(f heart +f resp )

[0049] Among them, f received is the first frequency, f c is the center frequency of the CW wave, f bs is the second frequency.

[0050] According to an embodiment of the present application, f c and f bs are known quantities, and they can be selected from f by frequency screening. received After filtering, the heart rate f can be obtained by processing heart and respiratory rate f resp , complete the measurement of vital signs and result analysis.

[0051] In an embodiment of the present application, optionally, the detection device determines user identity information corresponding to the first device based on the vital sign detection information.

[0052] Correspondingly, the embodiment of the present application also provides a detection method based on backscattering, which is applied to a wearable device. The wearable device corresponds to Figure 2 The device under test in the embodiment, the wearable device includes an antenna and a backscatter transmitter, referring to Figure 3 , the method comprising:

[0053] S201, the wearable device transmits a signal to the detection device through an antenna using a backscatter transmitter, and during the signal transmission process, the wearable device switches the antenna matching state at a second frequency.

[0054] The hardware cost of the embodiments of the present application is low, and no special sensors are required to collect signals. The wearable device is carried by the human body, for example, and based on backscatter technology, continuous monitoring of vital signs such as heartbeat and breathing can be achieved, and the monitoring process is not easy to leak personal privacy.

[0055] In an embodiment of the present application, optionally, before the wearable device uses a backscatter transmitter to transmit a signal to the detection device through an antenna, the method also includes: the wearable device receives a request message sent by the detection device, the request message includes identity information of a first device, and the request information is used to request the first device to send vital sign detection information; if the identity of the wearable device is consistent with the identity of the first device, the wearable device determines to transmit a signal to the detection device.

[0056] In an embodiment of the present application, optionally, if the wearable device identity is inconsistent with the first device identity, the wearable device adjusts the antenna state, and the radar cross section RCS after adjustment is smaller than the RCS before adjustment. In this way, the interference of invalid signals to the detection device can be reduced as much as possible, and the signal-to-noise ratio of the reflected signal of the first device, that is, the target device, can be improved.

[0057] In an embodiment of the present application, optionally, the wearable device receives a reset signal sent by the detection device, and in response to the reset signal, the wearable device returns to a default state, in which the wearable device waits to receive the next request information.

[0058] By using the embodiments of the present application, detection information can be requested from multiple wearable devices, and when used in a multi-person scene, the vital signs of each person in the scene can be effectively identified.

[0059] In an embodiment of the present application, optionally, the wearable device sends first information during signal transmission, the frequency of the first information is different from the second frequency, and the first information is used by the detection device to confirm the identity of the wearable device.

[0060] In the embodiments of the present application, optionally, the detection device and the wearable device are both implemented in hardware. The hardware structures of the detection device and the wearable device in the embodiments of the present application are described in detail below.

[0061] In the embodiments of the present application, the "wearable device" may adopt a physical structure that is convenient for users to carry or wear, and should be small in size and light in weight, such as a card-shaped design, a pen-shaped design, etc., and does not need to be a smart device, but an ordinary hardware carrier. Figure 4 The structure of a wearable device according to an embodiment of the present application is schematically shown, which mainly includes two parts: an antenna and a chip.

[0062] Optionally, in some embodiments of the present application, the antenna may be a dipole antenna, and in some applications, a patch antenna, a loop antenna, or an antenna array composed of multiple monopoles may also be used. Optionally, the wearable device may use a radio frequency in the range of 200MHz-100GHz.

[0063] Optionally, in some implementations of the present application, the antenna may be made of an independent metal (such as copper); the metal may be attached to the antenna of a dielectric object by printing, etching or other means, and the dielectric object may be ceramic, resin or a printed circuit board (PCB), etc.

[0064] Optionally, in some implementations of the present application, the antenna can be made of conductive wearable material (conductivetextile material). The wearable device made of such material can be more conveniently sewn on knitted fabrics such as clothes, and can also be used independently.

[0065] Figure 5 The structure of a chip in a wearable device of an embodiment of the present application is schematically shown. The chip may contain: a receiver, a radio frequency energy collection device, a backscatter transmitter, an energy management module, a microprocessor for controlling a logic circuit, and a memory.

[0066] Optionally, in some implementations of the present application, the chip can be manufactured using a complementary metal oxide semiconductor (CMOS) process; the chip can be manufactured using a system in package (SiP) process; the chip can be manufactured in the form of a PCB. Optionally, in some implementations of the present application, the memory is a non-independent module, and the memory is integrated into the microprocessor.

[0067] The detection device of the embodiment of the present application may also be referred to as a monitoring device. Optionally, it may be designed as follows: Figure 6 The structure shown is placed at a fixed position in the application environment when working. The monitoring device may include: an antenna, a transmitter, a receiver, a modem module and a central processor. The detection device can obtain and process the information of the wearable device, and can also feed back the information to the server for notifying the user.

[0068] It should be understood that the above Figure 4 , Figure 5 and Figure 6 The hardware structure shown is only an exemplary structure. Under the premise of being able to realize the functions of the embodiments of the present application, the detection device and the wearable device can adopt various suitable hardware structure designs, and the embodiments of the present application are not limited to this.

[0069] The specific implementation process of the embodiment of the present application is described below through specific examples.

[0070] Figure 7A schematic diagram of an application scenario of an embodiment of the present application is shown, in which the monitoring device 100 can perform backscatter-based wireless communication with multiple wearable devices within a certain spatial range. For example, Figure 7 As shown in FIG. 1 , wearable device 1, wearable device 2, ..., wearable device n are respectively carried by life form 1, life form 2, ..., life form n. The ID information of wearable devices 1 to n can be pre-stored in the monitoring device 100. Wearable devices 1 to n are respectively carried by multiple life forms (such as users, patients), such as sewn into clothes, installed in wearable bracelets or decorations, etc. Figure 7 Shown is a wearable device sewn into clothing.

[0071] In this embodiment, the monitoring device 100 can obtain and process the information of each wearable device to achieve the purpose of identifying the vital signs of the target object. The following describes the interaction process between the monitoring device 100 and the wearable device in the embodiment of the present application.

[0072] ① First, the monitoring device 100 determines the target object. For example, according to the instruction, it is determined that the user's vital signs of wearable device 1 need to be obtained. Then, the monitoring device 100 locks the communication with wearable device 1 this time. The monitoring device 100 can obtain the ID of wearable device 1 according to the instruction, or extract the ID of wearable device 1 from the pre-stored wearable device ID information. Then, the monitoring device 100 sends a detection request information. Specifically, the monitoring device 100 transmits a signal through an antenna. The signal carries the ID information of wearable device 1, which is used to request wearable device 1 to feedback the user's vital signs detection information to the monitoring device 100.

[0073] Optionally, the ID information of the wearable device may include a unique identification (UID) of the wearable device.

[0074] ② Multiple wearable devices within the receivable signal range can receive the detection request information sent by the monitoring device 100, which contains the UID of the wearable device that is required to provide information. Each wearable device that receives the detection request information checks whether the UID carried in the detection request information matches its own UID. If the match is successful, it means that the wearable device should provide vital sign information to the monitoring device 100, and then proceed to the next step.

[0075] Optionally, if the matching fails, the wearable device may not perform other operations, or may adopt a processing method of reducing the RCS, which will be described in detail below.

[0076] ③ Taking wearable device 1 as an example, UID matching is successful. As feedback, wearable device 1 starts to transmit signals at a fixed frequency (denoted as f bs ) switches its antenna matching state, and the maintenance time of this switching antenna matching state is recorded as t detection_tag When the wearable device 1 transmits a signal, the monitoring device 100 transmits a carrier CW. Here, since the wearable device 1 is carried by the user, the signal it transmits will carry the user's vital signs information such as the heart rate f heart , respiratory rate is f resp .

[0077] Where, optionally, t detection_tag The duration of the detection may be preset, or may be carried in the detection request information sent by the monitoring device 100 in the aforementioned step ①. Optionally, the carrier CW may be a continuous wave such as a sine wave.

[0078] ④ The monitoring device 100 monitors the feedback information of the wearable device 1, and the monitoring duration is t detection_reader , monitoring time t detection_reader Should be greater than or equal to t detection_tag After the monitoring is completed (for example, t detection_reader After reaching the time point, the process of the wearable device 1 detecting the user's vital signs information ends, and the monitoring device 100 can transmit a signal S reset , used to notify each wearable device 1~n that it can return to normal state and wait for the monitoring device 100 to send the next detection request information.

[0079] ⑤100 pairs of monitoring equipment at t detection_reader The information collected in the time period is filtered to obtain heartbeat and respiration related information. The monitoring device 100 can associate this information with the UID of the wearable device 1 and send it to the server, which can feed back to the user.

[0080] By repeating the above processing steps ① to ⑤, the monitoring device 100 can use the same method to obtain detection information of other wearable devices and obtain the vital sign information of the corresponding user.

[0081] Optionally, it is assumed that the center frequency of the CW wave emitted by the monitoring device 100 is f c , the heart beat frequency is f heart , the breathing frequency is f resp In ③, the frequency at which wearable device 1 switches the antenna matching state is f bs , the frequency f received by the monitoring device 100 received It can be calculated according to the formula given above, as follows:

[0082] f received =fc +f bs +(f heart +f resp )

[0083] Among them, f c and f bs is known, and is selected from f by frequency screening. received By filtering out the heart rate, we can get the heart rate f heart and respiratory rate f resp .

[0084] Optionally, in ②, if the UID matching fails, taking wearable device 2 as an example, the following processing can be performed: wearable device 2 converts its antenna state to a state that minimizes the antenna RCS, thereby reducing the interference of wearable device 2 to monitoring device 100. Similarly, other wearable devices that fail to match can adjust their antenna states to a state with the minimum RCS, minimize interference to monitoring device 100, and improve the signal-to-noise ratio of the reflected signal of the target wearable device, i.e., wearable device 1. After receiving the S reset After receiving the signal, the wearable device 2 can be reset, that is, restored to a normal state, waiting for the next detection request.

[0085] In ③, wearable device 1 is at t detection_tag Use a fixed frequency f during the time period bs Switch the antenna matching state. Optionally, in other embodiments of the present application, the wearable device 1 can also switch the antenna matching state at t detection_tag Add information S to the transmitted signal during the time period connected , that is, the wearable device 1 does not use a fixed frequency f bs Instead of transmitting a signal, it uses a variable frequency f signal The transmitting signal can be increased by, for example, changing the frequency of the impedance matching of the wearable device 1. connected , where S connected After the information transmission is completed, it will be changed back to the fixed frequency f bs The monitoring device 100 transmits a signal through S connected It can be confirmed that the reflected signal comes from the wearable device 1. Optionally, detection_tag Increase S multiple times during the period connected , each time S connected After the information transmission is completed, it is converted to a fixed frequency f bs The purpose of this processing is that the monitoring device 100 can confirm multiple times during the monitoring process that the monitoring signal comes from the target wearable device 1, thereby improving the reliability of the detection result.

[0086] Optionally, in ⑤, the monitoring device 100 may use physical filtering and digital filtering to obtain heartbeat information and respiratory information.

[0087] (1) Physical filtering: The monitoring equipment should have the components required for physical filtering, such as a filter using the surface acoustic wave (SAW) method to obtain the heart rate frequency f heart and respiratory rate f resp .

[0088] (2) Digital filtering: The signal is processed by a filtering algorithm in the central processor of the monitoring device to restore the heartbeat frequency f heart and respiratory rate f resp .

[0089] (3) Combination of digital filtering and physical filtering: The CW frequency f can be filtered out by physical filtering. c , and then filter out f by digital filtering bs , and finally restore the heart rate f heart and respiratory rate f resp .

[0090] Optionally, in the application, user identification can be performed by analyzing vital signs information. Specifically, in reality, the heart beat conforms to a certain waveform and has individual differences similar to fingerprints. A large amount of vital signs data can be collected to establish a data archive of the user's heartbeat and breathing behavior. The monitoring device can re-determine the user identity corresponding to the vital signs information by comparing the archive. Therefore, the user identity can be determined by the UID in the wearable device, and the user identity can be re-confirmed by comparing the heartbeat and breathing behavior archives, thereby improving the reliability of the identification result.

[0091] The above describes the specific configuration and implementation of the embodiments of the present application from different perspectives through multiple embodiments. Corresponding to the processing method of at least one of the above embodiments, the embodiments of the present application also provide a detection device 200, referring to Figure 8 , which includes:

[0092] A receiver 210, configured to receive a signal transmitted by a first device, wherein the signal received by the detection device has a first frequency; wherein the signal transmitted by the first device is a signal transmitted to the detection device via an antenna using a backscatter transmitter, and during the signal transmission process, the first device switches the antenna matching state at a second frequency;

[0093] The transmitter 220 is used to transmit a carrier CW through the antenna 230 during the process of receiving the signal transmitted by the first device;

[0094] The detection information determination module 240 is used to determine vital sign detection information based on the first frequency, the second frequency and the frequency of the carrier CW.

[0095] Corresponding to the processing method of at least one of the above embodiments, the present application embodiment further provides a wearable device 300, referring to Fig. 9 , which includes:

[0096] The backscatter transmitter 310 is used to transmit a signal to the detection device through the antenna 320 when the identity of the wearable device is consistent with the identity of the first device, and switch the antenna matching state at a second frequency value during the signal transmission process.

[0097] In the embodiments of the present application, the wearable device is carried by a living being, such as a human body, and can transmit the vital signs information of the human body within an agreed time period to a detection device, thereby realizing continuous monitoring of important vital signs of the living being, such as heartbeat, breathing, etc., and the monitoring process will not disclose personal privacy; the wearable device transmits the vital signs information to the detection device by backscattering, does not require special sensors to collect information, and has low hardware costs.

[0098] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0099] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0100] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A detection method based on backscattering, applied to a detection device, the detection device comprising an antenna, a transmitter, a receiver and a processor, the method comprising: The detection device sends request information to at least one device under test, the request information including identity information of a first device, the request information being used to request the first device to send vital sign detection information, wherein if the identity of the device under test is consistent with the identity of the first device, the device under test determines to transmit a signal to the detection device, and if the identity of the device under test is inconsistent with the identity of the first device, the device under test adjusts the antenna state, and the radar cross section RCS after adjustment is less than the RCS before adjustment; The detection device receives a signal transmitted by the first device through a receiver, and the signal received by the detection device has a first frequency; wherein the signal transmitted by the first device is a signal transmitted to the detection device through an antenna using a backscatter transmitter, and during the signal transmission process, the first device switches the antenna matching state at a second frequency; The detection device transmits a carrier CW through an antenna using a transmitter in the process of receiving a signal transmitted by the first device; After receiving the signal transmitted by the first device, the detection device sends a reset signal to the at least one device under test, wherein the reset signal is used to instruct the at least one device under test to restore to a default state, in which the at least one device under test waits to receive the next request information; The processor of the detection device determines vital sign detection information based on the first frequency, the second frequency, and the frequency of the carrier CW.

2. The method according to claim 1, wherein: The signal received by the detection device includes first information, and the frequency of the first information is different from the second frequency; The method also includes: the detection device confirming the identity of the first device according to the first information.

3. The method according to claim 1, wherein the detection device determines vital sign detection information based on the first frequency, the second frequency and the frequency of the carrier CW, comprising: The detection device processes the first frequency, the second frequency and the frequency of the carrier CW by physical filtering and / or digital filtering to determine the vital sign detection information.

4. The method according to any one of claims 1 to 3, wherein: The vital sign detection information includes heart rate and breathing rate, The detection device determines vital sign detection information based on the first frequency, the second frequency, and the frequency of the carrier CW, including: The detection device determines the heart beat frequency f according to the following formula heart and respiratory rate f resp : f received =f c +f bs +(f hear +f resp ) Among them, f received is the first frequency, f c is the center frequency of the CW wave, f bs is the second frequency.

5. The method according to any one of claims 1 to 3, further comprising: The detection device determines user identity information corresponding to the first device based on the vital sign detection information.

6. A backscatter-based detection method, applied to a wearable device, the wearable device comprising an antenna and a backscatter transmitter, the method comprising: The wearable device receives request information sent by the detection device, where the request information includes identity information of the first device, and the request information is used to request the first device to send vital sign detection information; If the identity of the wearable device is consistent with the identity of the first device, the wearable device transmits a signal to the detection device through an antenna using a backscatter transmitter, and during the signal transmission process, the wearable device switches the antenna matching state at a second frequency; If the identity identifier of the wearable device is inconsistent with the identity identifier of the first device, the wearable device adjusts the antenna state, and the radar scattering cross section RCS after adjustment is smaller than the RCS before adjustment; The wearable device receives a reset signal sent by the detection device; In response to the reset signal, the wearable device returns to a default state, in which the wearable device waits to receive next request information.

7. The method according to claim 6, wherein: The wearable device sends first information during the signal transmission process, the frequency of the first information is different from the second frequency, and the first information is used by the detection device to confirm the identity of the wearable device.

8. The method according to claim 6 or 7, wherein: The vital sign detection information includes the heart rate and / or breathing rate of the user corresponding to the wearable device.

9. A detection device comprising: A transmitter, configured to send request information to at least one device under test, the request information including identity information of a first device, the request information being used to request the first device to send vital sign detection information, wherein if the identity of the device under test is consistent with the identity of the first device, the device under test determines to transmit a signal to the detection device, and if the identity of the device under test is inconsistent with the identity of the first device, the device under test adjusts an antenna state, and the radar cross section RCS after adjustment is less than the RCS before adjustment; A receiver, configured to receive a signal transmitted by a first device, wherein the signal received by the detection device has a first frequency; wherein the signal transmitted by the first device is a signal transmitted to the detection device via an antenna using a backscatter transmitter, and during the signal transmission process, the first device switches the antenna matching state at a second frequency; The transmitter is further used to transmit a carrier CW through an antenna during the process of receiving a signal transmitted by the first device; The transmitter is further used to send a reset signal to the at least one device under test after receiving the signal transmitted by the first device, wherein the reset signal is used to instruct the at least one device under test to restore to a default state, in which the at least one device under test waits to receive the next request information. The detection information determination module is used to determine vital sign detection information based on the first frequency, the second frequency and the frequency of the carrier CW.

10. The detection device according to claim 9, wherein: The signal received by the receiver includes first information, and the frequency of the first information is different from the second frequency; A device identity confirmation module is used to confirm the identity of the first device according to the first information.

11. The detection device according to claim 9, further comprising: A first filtering processing module, configured to process the first frequency, the second frequency and the frequency of the carrier CW by physical filtering to determine the vital sign detection information; and / or, The second filtering processing module is used to process the first frequency, the second frequency and the frequency of the carrier CW by digital filtering to determine the vital sign detection information.

12. The detection device according to any one of claims 9 to 11, wherein: The vital sign detection information includes heart rate information and respiratory rate information, The detection information determination module is also used to determine the heart rate f according to the following formula heart and respiratory rate f resp : f received =f c +f bs +(f heart +f resp ) Among them, f received is the first frequency, f c is the center frequency of the CW wave, f bs is the second frequency.

13. The detection device according to any one of claims 9 to 11, further comprising: A user identity determination module is used to determine user identity information corresponding to the first device based on the vital sign detection information.

14. A wearable device comprising: A receiver, configured to receive a request message sent by a detection device, wherein the request message includes identity information of a first device, and the request message is used to request the first device to send vital sign detection information; a determination module, configured to determine, when the identity identifier of the wearable device is consistent with the identity identifier of the first device, to transmit a signal to the detection device; an adjustment module, configured to adjust the antenna state when the identity identifier of the wearable device is inconsistent with the identity identifier of the first device, and the radar cross section RCS after adjustment is smaller than the RCS before adjustment; A backscatter transmitter is used to transmit a signal to the detection device through an antenna, and during the signal transmission process, the wearable device switches the antenna matching state at a second frequency, in, The receiver is also used to receive a reset signal sent by the detection device, The adjustment module is also used to restore the wearable device to a default state after the receiver receives the reset signal, and the wearable device waits to receive the next request information in the default state.

15. The wearable device according to claim 14, wherein: The backscatter transmitter is also used to send first information during the signal transmission process, the frequency of the first information is different from the second frequency, and the first information is used by the detection device to confirm the identity of the wearable device.

16. The wearable device according to claim 14 or 15, wherein: The vital sign detection information includes the heart rate and / or breathing rate of the user corresponding to the wearable device.

17. A detection device comprising: An antenna, a transmitter, a receiver, a processor and a memory, wherein the memory is used to store a computer program, and the processor calls and runs the computer program stored in the memory to execute the method according to any one of claims 1 to 5.

18. A wearable device comprising: An antenna, a receiver, a backscatter transmitter, a processor and a memory, wherein the memory is used to store a computer program, and the processor calls and runs the computer program stored in the memory to execute the method according to any one of claims 6 to 8.

19. A computer-readable storage medium for storing a computer program, wherein: The computer program causes a computer to execute the method according to any one of claims 1 to 8.

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