WO2022021166A1

WO2022021166A1 - Backscatter-based detection method and detection device, and wearable device

Info

Publication number: WO2022021166A1
Application number: PCT/CN2020/105644
Authority: WO
Inventors: 邵帅
Original assignee: Oppo广东移动通信有限公司
Priority date: 2020-07-29
Filing date: 2020-07-29
Publication date: 2022-02-03
Also published as: CN115428488A

Abstract

The present application relates to a backscatter-based detection method and detection device, and a wearable device. The method is applied to the detection device; and the detection device comprises an antenna, a transmitter, a receiver, and a processor. The method comprises: the detection device receives, by the receiver, a signal transmitted by a first device, the signal received by the detection device having a first frequency, wherein the signal transmitted by the first device is a signal transmitted by a backscatter transmitter to the detection device via the antenna, and the first device switches an antenna matching state at a second frequency during the signal transmitting process; the detection device uses the transmitter to transmit a carrier CW via the antenna during the process of receiving the signal transmitted by the first device; and the processor of the detection device determines vital sign detection information on the basis of the first frequency, the second frequency, and the frequency of the carrier CW.

Description

Backscatter-based detection method, detection device and wearable device

technical field

The present application relates to the field of communications, and more particularly, to a detection method, detection device and wearable device based on backscattering.

Background technique

In electronic products, the function of vital sign recognition has become relatively common. For example, biometrics (fingerprint, iris, voiceprint, face, etc.) are used to identify specific users and realize the function of unlocking electronic products; some new smart devices can also monitor the vital signs of patients. Such as heartbeat, blood pressure, blood oxygen content and other indicators, to achieve health tracking and reminders.

However, at present, most electronic products mainly use special sensors to collect and identify vital sign information, and use communication standards and algorithms to cooperate. Not only the overall hardware and software costs are high, but also the following drawbacks may exist: Most of the common identification applications focus on the "first" opening function, such as unlocking, decrypting payment and other functions using face recognition, fingerprint recognition, iris recognition or voice recognition, aiming to achieve "one-time recognition". Since continuous identification cannot be achieved, if the user needs to be confirmed again, biometric identification 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 identification for a certain period of time, but the use of camera face recognition technology will expose user privacy and seriously affect the enthusiasm for use, and computer vision technology is affected by factors such as environment, light, and shelter. Influence, 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

In view of this, embodiments of the present application provide a backscatter-based detection method, a detection device, and a wearable device.

An embodiment of the present application provides a detection method based on backscatter, which is applied to a detection device. The detection device includes an antenna, a transmitter, a receiver, and a processor. The signal received by the detection device has a first frequency; wherein the signal transmitted by the first device is a signal transmitted by a backscatter transmitter to the detection device through an antenna. A device switches the antenna matching state at the second frequency; the detection device uses a transmitter to transmit a carrier CW through the antenna during the process of receiving the signal transmitted by the first device; the processor of the detection device is based on the first frequency, The second frequency and the frequency of the carrier CW determine vital sign detection information.

An embodiment of the present application provides a detection method based on backscatter, which is applied to a wearable device, where the wearable device includes an antenna and a backscatter transmitter, and the method includes: the wearable device uses the backscatter transmitter to pass The antenna transmits a signal to the detection device, and the wearable device switches the antenna matching state at the second frequency during the process of transmitting the signal.

The embodiment of the present application also provides a detection device, including:

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

a transmitter, configured to transmit a carrier wave CW through an antenna in the process of receiving the signal transmitted by the first device;

A detection information determination module, configured to determine vital sign detection information based on the first frequency, the second frequency and the frequency of the carrier CW.

Embodiments of the present application also provide a wearable device, including:

The backscatter transmitter is used for transmitting a signal to the detection device through the antenna, and during the process of transmitting the signal, the wearable device switches the antenna matching state at the second frequency.

An embodiment of the present application further provides a detection device, including: an antenna, a transmitter, a receiver, a processor, and a memory, where the memory is used to store a computer program, and the processor invokes and executes the computer program stored in the memory , execute the method described above.

Embodiments of the present application also provide a wearable device, including: an antenna, a receiver, a backscatter transmitter, a processor, and a memory, where the memory is used to store a computer program, and the processor calls and runs the memory in the memory A stored computer program that performs the method as described above.

An embodiment of the present application further provides a chip, including: a processor, configured to call and run a computer program from a memory, so that a device on which the chip is installed executes the above method.

Embodiments of the present application further provide a computer-readable storage medium for storing a computer program, wherein the computer program causes a computer to execute the above method.

Embodiments of the present application further provide a computer program product, including computer program instructions, wherein the computer program instructions cause a computer to execute the above method.

The embodiments of the present application also provide a computer program, the computer program enables a computer to execute the above method.

In the embodiment of the present application, the wearable device is carried by a living body such as a human body, and can transmit the vital sign information of the human body to the detection device within a certain period of time, so as to realize continuous monitoring of important vital signs of the living body, such as heartbeat, breathing, etc., The monitoring process will not reveal personal privacy; the wearable device transmits vital sign information to the detection device by means of backscattering, no special sensor is required to collect information, and the hardware cost is low.

Description of drawings

Figure 1 schematically shows a schematic diagram of a heart beat spectrum measured by a medical device.

FIG. 2 is a flowchart of a detection method of a detection device according to an embodiment of the present application.

FIG. 3 is a flowchart of a method for detecting a wearable device according to an embodiment of the present application.

FIG. 4 is a schematic structural block diagram of a wearable device according to an embodiment of the present application.

FIG. 5 is a schematic structural block diagram of a chip of a wearable device according to an embodiment of the present application.

FIG. 6 is a schematic structural block diagram of a detection device according to an embodiment of the present application.

FIG. 7 is a schematic diagram of an application scenario of an embodiment of the present application.

FIG. 8 is a schematic structural block diagram of another detection device according to an embodiment of the present application.

FIG. 9 is a schematic structural block diagram of another wearable device according to an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

The technical solutions of the embodiments of the present application will be described below with reference to the accompanying drawings of the embodiments of the present application. Wherein, various details of the embodiments of the present application are described to help understanding, and are only used as exemplary implementations. Those skilled in the art should recognize that various changes or modifications may be made to the described specific implementations, but not It will go against the principle and spirit of the embodiments of the present application, so all these changes and modifications fall within the protection scope of the embodiments of the present application. In addition, for the sake of clarity and conciseness, the description of some well-known functions and structures is omitted in the description of the specific implementation manner, which does not affect the implementation of the embodiments of the present application. The various embodiments of the present application described herein, if not mutually exclusive, can be implemented in any combination to achieve basic and/or further superimposed beneficial technical effects.

The term "and/or" herein is used to describe the relationship between multiple related objects, for example, it means that two related objects may exist in three possible relationships. For example, A and/or B can mean: A alone exists, A simultaneously exists There are three cases, A and B, and B alone. The character "/" in this document generally indicates that the related objects are "or".

It should be understood that, in the various embodiments of the present application, the size of the sequence numbers of the various processes involved does not mean the sequence of execution, and the execution sequence of each process is determined by its function and internal logic, so the size of the sequence numbers The implementation process of the embodiments of the present application is not particularly limited.

In the description of the embodiments of the present application, the term "corresponding" may indicate that there is a direct or indirect corresponding relationship between the two, or may indicate that there is an associated relationship between the two, or indicate and be instructed, configure and be instructed configuration, etc.

Before describing the embodiments of the present application, a brief introduction to the backscattering technique is given first. Backscattering technology takes radar technology as the theoretical and application basis, and backscattering technology utilizes the concept of Radar Cross Section (RCS) in radar principle. To put it simply, when an electromagnetic wave encounters a space target, part of its energy is absorbed by the target, and the other part is scattered in various directions with different intensities. In the scattered energy, part of it is reflected back to the transmitting antenna and received by the transmitting antenna (so the transmitting antenna is also a receiving antenna), and the received signal is amplified and processed to obtain the relevant information of the target. In the 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 the size, shape, material, distance from the radar and other factors of the target.

Based on the above theoretical basis, an embodiment of the present application proposes a method for detecting vital sign information based on backscattering. The frequency change of the reflected signal depends on the change of the RCS, so by manipulating the frequency change of the RCS, the transmitted signal of the carrier can be encoded, so that the target signal can be identified among many reflected signals; in addition, in practice, due to the life of the human body Sign information such as respiration, heart beat, etc. are periodic motions. Figure 1 shows the heart beat spectrum measured by medical equipment. Heart beats are periodic motions, which will cause small changes in the overall shape of the human body. For devices with backscattering function, the periodic changes of human vital signs will change the distance between the devices. The greater the distance, the weaker the backscattered signal. By collecting and analyzing the strength of the reflected signal of the target, the vital signs of the target human body can be obtained. information to achieve the purpose of detecting vital signs of the human body.

Based on the above idea, an embodiment of the present application provides a detection method based on backscattering, which is applied to a detection device. The detection device includes an antenna, a transmitter, and a receiver. Referring to FIG. 2 , the method includes:

S101, a 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 sent to the detection device through an antenna using a backscatter transmitter The signal transmitted by the device, during the process of transmitting the signal, the first device switches the antenna matching state at the second frequency;

S102, in the process of receiving the signal transmitted by the first device, the detection device uses a transmitter to transmit a carrier wave CW through an antenna;

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.

Both the detected device and the first device in the embodiments of the present application can be designed as wearable devices, such as a card that can be sewn into clothing, a wristband that can be worn, a watch or a decoration, etc. Since no special sensor is required to collect information , so the hardware cost can be reduced. The wearable device is carried by the living body such as the human body. Based on the backscattering technology, the wearable device can transmit the vital sign information of the human body to the detection device within a certain period of time, so as to realize the importance of vital signs to the living body. Continuous monitoring of vital signs such as heartbeat, respiration, etc., the monitoring process is not easy to reveal personal privacy.

In the embodiment of the present application, optionally, before the detection device receives the signal transmitted by the first device through the receiver, the method further includes: the detection device sends request information to at least one device under test, the request The 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.

In the embodiment of the present application, optionally, after the detection device receives the signal transmitted by the first device, the detection device sends a reset signal to the at least one device under test, and the reset signal uses for instructing the at least one device under test to return to a default state, in which the at least one device under test waits to receive the next request information.

For the next request for information, the detection information of the corresponding wearable device can be obtained by the same processing method as above, so that the vital sign information of different users can be obtained, which can achieve accurate information for each person in a multi-person scene or environment. identify.

In the 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 may The first information confirms the identity of the first device.

In the above manner, the identity of the detection device and the wearable device can be confirmed multiple times through the first information. For example, the first information includes the ID of the wearable device, and the detection device can receive the current communication wearable device when receiving the reflected signal. ID, the detection device can confirm the identity of the wearable device accordingly, and multiple times of sending the first information can achieve multiple identity confirmations, and can verify the identity without interrupting the user’s current work to ensure the source of the information. precise.

In the 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 uses physical The first frequency, the second frequency and the frequency of the carrier CW are processed in a filtering and/or digital filtering manner to determine the vital sign detection information.

In the embodiment of the present application, optionally, the vital sign detection information includes a heart beat frequency and a breathing frequency; the detection device is based on the first frequency, the second frequency and the frequency of the carrier CW, Determining the vital sign detection information includes: the detection device determines the heart beat frequency f _heart and the breathing frequency as f _resp according to the following formula:

f _received =f _c +f _bs +(f _heart +f _resp )

Wherein, f _received is the first frequency, f _c is the center frequency of the CW wave, and f _bs is the second frequency.

According to the embodiment of the present application, f _c and f _bs are known quantities, and they can be filtered out from f _received by means of frequency screening, and then processed to obtain the heartbeat frequency f _heart and the respiratory frequency f _resp , and the pairing is completed. Measurement of vital signs and analysis of results.

In the 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.

Correspondingly, an embodiment of the present application further provides a detection method based on backscatter, which is applied to a wearable device. The wearable device corresponds to the device under test in the embodiment of FIG. 2 , and the wearable device includes an antenna and an anti-reflection device. To the scatter transmitter, referring to FIG. 3, the method includes:

S201, the wearable device uses a backscatter transmitter to transmit a signal to the detection device through an antenna, and the wearable device switches the antenna matching state at a second frequency during the signal transmission process.

The hardware cost of the embodiments of the present application is low, and no special sensor is required to collect signals. The wearable device is carried by, for example, the human body. Based on the backscattering technology, continuous monitoring of vital signs such as heartbeat and respiration can be realized, and the monitoring process is not easy. Disclosure of personal privacy.

In the embodiment of the present application, optionally, before the wearable device transmits a signal to the detection device by using a backscatter transmitter through an antenna, the method further includes: the wearable device receives a signal sent by the detection device. Request information, the request information includes the 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 wearable device identity and the identity of the first device If the identifiers are consistent, the wearable device determines to transmit a signal to the detection device.

In the embodiment of the present application, optionally, if the wearable device identification is inconsistent with the first device identification, the wearable device adjusts the antenna state, and the adjusted radar cross section RCS is less than RCS before conditioning. In this way, the interference of invalid signals on 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.

In the 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 default state is The wearable device described below is waiting to receive the next request message.

Using the embodiments of the present application, detection information can be requested for multiple wearable devices, and when used in a multi-person scene, the vital signs of each person in the scene can be effectively identified.

In the embodiment of the present application, optionally, the wearable device sends first information in the process of transmitting a signal, the frequency of the first information is different from the second frequency, and the first information is used for all The detection device confirms the identity of the wearable device.

In the embodiments of the present application, optionally, the detection device and the wearable device are implemented by hardware, and the hardware structures of the detection device and the wearable device in the embodiments of the present application are described in detail below.

In the embodiments of the present application, regarding the "wearable device", a physical structure that is convenient for users to carry or wear can be adopted, and it should be small in size and light in weight, such as card-shaped design, pen-shaped design, etc., and does not need to be intelligent A common hardware carrier is sufficient. FIG. 4 schematically shows the structure of a wearable device according to an embodiment of the present application, which mainly includes two parts: an antenna and a chip.

Optionally, in some implementations of the present application, the antenna may be a dipole antenna, and in some applications, a patch antenna (patch antenna), a loop antenna (loop antenna), or a plurality of An antenna array composed of monopoles. Optionally, the wearable device may use radio frequencies in the frequency range of 200MHz-100GHz.

Optionally, in some implementations of the present application, the antenna can be made of independent metal (such as copper); printing, etching or other means can be used to attach the metal to the antenna of a dielectric, and the dielectric can be ceramic, resin or printing Circuit board (Printed Circuit Board, PCB), etc.

Optionally, in some implementations of the present application, the antenna can be made of a conductive wearable material (conductive textile material), and the wearable device made of this material can be easily sewn on knitted fabrics such as clothes, or can be independently use.

FIG. 5 schematically shows the structure of a chip in a wearable device according to an embodiment of the present application. The chip may contain: a receiver, a radio frequency energy collection device, a backscatter transmitter, an energy management module, a Microprocessors and memories for controlling logic circuits.

Optionally, in some implementations of the present application, the chip may be fabricated by a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) process; the chip may be fabricated by a system in package (system in package, SiP) process; The chip can be made in the form of a PCB. Optionally, in some implementations of the present application, the memory is a dependent module, and the memory is integrated in the microprocessor.

Regarding the detection device of the embodiment of the present application, it may also be called a monitoring device. Optionally, it may be designed as a structure as shown in FIG. 6 . During operation, it is placed at a fixed position in the application environment. The monitoring device may include : Antenna, transmitter, receiver, modem module and 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 to notify the user.

It should be understood that the hardware structure shown in FIG. 4 , FIG. 5 , and FIG. 6 is only an exemplary structure. Under the premise that the functions of the embodiments of the present application can be realized, the detection device and the wearable device can adopt various A suitable hardware structure design is not limited in this embodiment of the present application.

The specific implementation process of the embodiments of the present application will be described below through specific examples.

FIG. 7 shows a schematic diagram of an application scenario of an embodiment of the present application, in which the monitoring device 100 can perform backscatter-based wireless communication with multiple wearable devices within a certain spatial range. Shown as wearable device 1, wearable device 2, ..., wearable device n carried by living body 1, living body 2, ..., living body n, respectively. Among them, the identification ID information of the wearable devices 1 to n may be pre-stored in the monitoring device 100, and the wearable devices 1 to n are carried by a plurality of living bodies (such as users, patients), for example, sewn into clothing, installed In worn bracelets or decorations, etc., Figure 7 shows the wearable device sewn into clothing.

In this embodiment, the monitoring device 100 can acquire and process the information of each wearable device, so as to achieve the purpose of identifying the vital sign detection information of the target object. The following describes an interaction process between the monitoring device 100 and the wearable device in the embodiment of the present application.

① First, the monitoring device 100 determines the target object. For example, according to the instruction, it is determined that the user's life characteristics of the wearable device 1 need to be obtained. Then the monitoring device 100 locks the communication with the wearable device 1 this time, and the monitoring device 100 can obtain the wearable device according to the instruction. The ID of the wearable device 1 can also be extracted from the pre-stored wearable device ID information, and then the monitoring device 100 sends the detection request information. Specifically, the monitoring device 100 transmits a signal through the antenna, and the signal carries The ID information of the wearable device 1 is used to request the wearable device 1 to feed back the detection information of the user's vital signs to the monitoring device 100 .

Wherein, optionally, the ID information of the wearable device may include an independent identification code (unique identification, UID) of the wearable device.

② Multiple wearable devices within the range of the receivable signal can receive the detection request information sent by the monitoring device 100, and the detection request information contains the UID of the wearable device that is required to provide information. Each wearable device that has received the detection request information checks whether the UID carried in the detection request information matches its own UID. If the matching is successful, it means that the wearable device should provide vital sign information to the monitoring device 100, and the next step is entered.

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.

③ Take wearable device 1 as an example, UID matching is successful, as feedback, wearable device 1 starts to transmit signals, and switches its antenna matching state at a fixed frequency (denoted as f _bs ), the maintenance time of this switching antenna matching state Denote it as t _{detection_tag} . During the process of the wearable device 1 transmitting the signal, the monitoring device 100 transmits the carrier wave CW. Here, since the wearable device 1 is carried on the user, the signal transmitted by the wearable device 1 will carry the user's vital sign information, such as the heartbeat frequency f _heart and the breathing frequency f _resp .

Wherein, optionally, the duration of t _{detection_tag} may be preset, or may be carried in the detection request information sent by the monitoring device 100 in the aforementioned step ①. Wherein, optionally, the carrier CW may be a continuous wave such as a sine wave.

④ The monitoring device 100 monitors the feedback information of the wearable device 1 , the monitoring duration is t _{detection_reader} , and the monitoring time t _{detection_reader} should be greater than or equal to t _{detection_tag} . After the monitoring is completed (for example, after t _{detection_reader} arrives), the process of detecting the user's vital sign information by the wearable device 1 ends, and the monitoring device 100 can transmit a signal S _reset to notify each wearable device 1-n that the normal state can be restored, and wait for The monitoring device 100 sends out next detection request information.

⑤ The monitoring device 100 performs filtering processing on the information collected in the t _{detection_reader} time period, so as 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, and the server can feed it back to the user.

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

Optionally, assuming that the center frequency of the CW wave transmitted by the monitoring device 100 is f _c , the heart beat frequency is f _heart , and the breathing frequency is f _resp , in ③, the frequency at which the wearable device 1 switches the antenna matching state is f _bs , The frequency f _{received received} by the monitoring device 100 can be calculated according to the formula given above, as follows:

f _received =f _c +f _bs +(f _heart +f _resp )

Wherein, f _c and f _bs are known, and they are filtered out from f _received by means of frequency screening, and the heartbeat frequency f _heart and the breathing frequency f _resp can be obtained.

Optionally, in (2), if the UID matching fails, taking the wearable device 2 as an example, the following processing can also be performed: the wearable device 2 converts its antenna state to a state that minimizes the antenna RCS, thereby reducing the wearable device state. 2. Interference to the monitoring device 100. In the same way, other wearable devices that fail to match can adjust their antenna state to the state with the smallest RCS, reduce the interference to the monitoring device 100 as much as possible, and improve the signal-to-noise of the reflected signal of the target wearable device, that is, the wearable device 1. Compare. After receiving the S _reset signal from the monitoring device 100, the wearable device 2 can be reset, that is, return to a normal state, and wait for the next detection request.

In ③, the wearable device 1 uses the fixed frequency f _bs to switch the antenna matching state during the t _{detection_tag} period. Optionally, in other embodiments of the present application, the wearable device 1 may also increase the amount of the transmitted signal during the t _{detection_tag} period. Information S _connected , that is to say, the wearable device 1 does not use a fixed frequency f _bs to transmit signals, but uses a variable frequency f _signal to transmit signals, for example, S _connected can be increased by changing the frequency of the impedance matching of the wearable device 1 , where , after the S _connected information transmission is completed, it is changed back to transmitting the signal at the fixed frequency f _bs , and the monitoring device 100 can confirm that the reflected signal comes from the wearable device 1 through S _connected . Optionally, S _connected may be increased multiple times within the t _{detection_tag} period, and each time the transmission of the S _connected information is completed, the signal will be transmitted at a fixed frequency f _bs . The purpose of this processing is that the monitoring device 100 can confirm that the monitoring signal comes from the target wearable device 1 multiple times during the monitoring process, thereby improving the reliability of the detection result.

Optionally, in (5), the monitoring device 100 may acquire heartbeat information and respiration information by using two methods of physical filtering and digital filtering.

(1) Physical filtering: The monitoring device should have the elements required for physical filtering, such as a filter using a surface acoustic wave (SAW) method to obtain the heartbeat frequency f _heart and the respiratory frequency f _resp .

(2) Digital filtering: In the central processor of the monitoring device, the signal is processed by a filtering algorithm to restore the heartbeat frequency f _heart and the respiratory frequency f _resp .

(3) The method of combining digital filtering and physical filtering: the CW frequency f _c can be filtered out first by means of physical filtering, and then f _bs can be filtered out by means of digital filtering, and finally the heartbeat frequency f _heart and the respiratory frequency f _resp can be restored.

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

The specific settings and implementations of the embodiments of the present application have been described above through multiple embodiments from different perspectives. Corresponding to the processing method of the above at least one embodiment, an embodiment of the present application further provides a detection device 200, referring to FIG. 8, which includes:

The receiver 210 is configured to receive a signal transmitted by a first device, and the signal received by the detection device has a first frequency; wherein the signal transmitted by the first device is a backscatter transmitter to the detection device through an antenna The transmitted signal, during the process of transmitting the signal, the first device switches the antenna matching state at the second frequency;

a transmitter 220, configured to transmit the carrier wave CW through the antenna 230 in the process of receiving the signal transmitted by the first device;

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

Corresponding to the processing method of at least one of the foregoing embodiments, an embodiment of the present application further provides a wearable device 300, referring to FIG. 9, which includes:

The backscatter transmitter 310 is configured to transmit a signal to the detection device through the antenna 320 under the condition that the wearable device identification is consistent with the identification of the first device, and in the process of transmitting the signal, use the first Two frequency values switch the antenna matching state.

In the embodiment of the present application, the wearable device is carried by a living body such as a human body, and can transmit the vital sign information of the human body within a predetermined time period to the detection device, thereby realizing continuous monitoring of important vital signs of the living body, such as heartbeat, breathing, etc., The monitoring process will not reveal personal privacy; the wearable device transmits vital sign information to the detection device by means of backscattering, no special sensor is required to collect information, and the hardware cost is low.

It should be understood that, in various embodiments of the present application, the size of the sequence numbers of the above-mentioned processes does not mean the sequence of execution, and the execution sequence of each process should be determined by its functions and internal logic, and should not be dealt with in the embodiments of the present application. implementation constitutes any limitation.

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

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art who is familiar with the technical scope disclosed in the present application can easily think of changes or substitutions. Covered within the scope of protection of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A detection method based on backscattering is applied to detection equipment, the detection equipment includes an antenna, a transmitter, a receiver and a processor, and the method includes:

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 transmitted to the detection device through an antenna using a backscatter transmitter signal, the first device switches the antenna matching state at the second frequency during the signal transmission process;

The detection device uses a transmitter to transmit a carrier wave CW through an antenna in 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.
The method according to claim 1, before the detection device receives the signal transmitted by the first device through the receiver, the method further comprises:

The detection device sends request information to at least one device under test, where the request information includes identification information of the first device, and the request information is used to request the first device to send vital sign detection information.
The method according to claim 1 or 2, further comprising:

After the detection device receives the signal transmitted by the first device, the detection device sends a reset signal to the at least one device under test, where the reset signal is used to instruct the at least one device under test to return to default state, in the default state, the at least one device under test waits to receive the next request information.
The method according to any one of claims 1-3, wherein,

Including first information in the signal received by the detection device, the frequency of the first information is different from the second frequency;

The method further includes: the detection device confirming the identity of the first device according to the first information.
The method according to any one of claims 1-4, 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 through physical filtering and/or digital filtering to determine the vital sign detection information.
The method according to any one of claims 1-5, wherein,

The vital sign detection information includes heart beat frequency and respiratory 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 heart and the respiration frequency f resp according to the following formulas:

f received =f c +f bs +(f heart +f resp )

Wherein, f received is the first frequency, f c is the center frequency of the CW wave, and f bs is the second frequency.
The method of any one of claims 1-6, further comprising:

The detection device determines user identity information corresponding to the first device based on the vital sign detection information.
A detection method based on backscatter, applied to a wearable device, the wearable device comprising an antenna and a backscatter transmitter, the method comprising:

The wearable device uses a backscatter transmitter to transmit a signal to the detection device through an antenna, and the wearable device switches the antenna matching state at the second frequency during the process of transmitting the signal.
The method according to claim 8, before the wearable device transmits a signal to the detection device through an antenna using a backscatter transmitter, the method further comprises:

The wearable device receives request information sent by the detection device, where the request information includes identification information of the first device, and the request information is used to request the first device to send vital sign detection information;

If the wearable device identification is consistent with the identification of the first device, the wearable device determines to transmit a signal to the detection device.
The method of claim 8 or 9, further comprising:

If the wearable device identification is inconsistent with the first device identification, the wearable device adjusts the antenna state, and the adjusted radar cross section RCS is smaller than the RCS before adjustment.
The method of any one of claims 8-10, further comprising:

the wearable device receives the reset signal sent by the detection device,

The wearable device is restored to a default state in which the wearable device waits to receive the next request information.
The method of any one of claims 8-11, wherein,

The wearable device sends first information in the process of transmitting a signal, 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.
The method of any one of claims 8-12, wherein,

The vital sign detection information includes the heart beat frequency and/or the breathing frequency of the user corresponding to the wearable device.
A detection device comprising:

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

a transmitter, configured to transmit a carrier wave CW through an antenna in the process of receiving the signal transmitted by the first device;

A detection information determination module, configured to determine vital sign detection information based on the first frequency, the second frequency and the frequency of the carrier CW.
The detection device of claim 14, wherein,

The transmitter is further configured to send request information to at least one device under test, where the request information includes identification information of the first device, and the request information is used to request the first device to send vital sign detection information.
The detection device according to claim 14 or 15, wherein,

The transmitter is further configured to send a reset signal to the at least one device under test after receiving the signal transmitted by the first device, where the reset signal is used to instruct the at least one device under test to return to a default state, In the default state, the at least one device under test waits to receive the next request information.
The detection device according to any one of claims 14-16, 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, configured to confirm the identity of the first device according to the first information.
The detection device according to any one of claims 14-17, further comprising:

a first filtering processing module, configured to process the first frequency, the second frequency and the frequency of the carrier CW through physical filtering, to determine the vital sign detection information; and/or,

The second filtering processing module is configured to process the first frequency, the second frequency and the frequency of the carrier CW by means of digital filtering to determine the vital sign detection information.
The detection device according to any one of claims 14-18, 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 heartbeat frequency f heart and the respiratory frequency f resp according to the following formula:

f received =f c +f bs +(f heart +f resp )

Wherein, f received is the first frequency, f c is the center frequency of the CW wave, and f bs is the second frequency.
The detection device according to any one of claims 14-19, further comprising:

A user identity determination module, configured to determine user identity information corresponding to the first device based on the vital sign detection information.
A wearable device comprising:

The backscatter transmitter is used for transmitting a signal to the detection device through the antenna, and during the process of transmitting the signal, the wearable device switches the antenna matching state at the second frequency.
The wearable device of claim 21, further comprising:

a receiver, configured to receive 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;

A determination module, configured to determine to transmit a signal to the detection device under the condition that the wearable device identification is consistent with the identification of the first device.
The wearable device of claim 22, further comprising:

The adjustment module is configured to adjust the antenna state when the wearable device identification is inconsistent with the identification of the first device, and the adjusted radar cross section RCS is smaller than the RCS before adjustment.
The wearable device of any of claims 21-23, wherein,

The receiver is further configured to receive a reset signal sent by the detection device,

The adjustment module is further configured to restore the wearable device to a default state after the receiver receives the reset signal, and in the default state, the wearable device waits to receive the next request information.
The wearable device of any one of claims 21-24, wherein,

The backscatter transmitter is further configured to send first information in the process of transmitting a signal, the frequency of the first information is different from the second frequency, and the first information is used for the detection device to confirm that the available The identity of the wearable device.
The wearable device of any one of claims 21-25, wherein,

The vital sign detection information includes the heart beat frequency and/or the breathing frequency of the user corresponding to the wearable device.
A detection device, comprising: an antenna, a transmitter, a receiver, a processor and a memory, the memory is used to store a computer program, the processor calls and runs the computer program stored in the memory, and executes the program as claimed in claim 1 The method of any one of to 7.
A wearable device, comprising: an antenna, a receiver, a backscatter transmitter, a processor and a memory, the memory is used to store a computer program, the processor calls and runs the computer program stored in the memory, executes A method as claimed in any one of claims 8 to 13.
A computer-readable storage medium for storing a computer program, wherein,

The computer program causes a computer to perform the method of any one of claims 1 to 13.