阅读说明：本技术 基于无线信号的运动状态检测装置、方法及系统 (Motion state detection device, method and system based on wireless signals ) 是由 赵倩 田军 李红春 丁根明 谢莉莉 于 2019-03-29 设计创作，主要内容包括：本发明实施例提供一种基于无线信号的运动状态检测装置、方法及系统,通过根据来自检测对象所在空间的无线反射信号计算反射点的能量的分布随时间的变化情况,并且根据该变化情况确定该检测对象的运动状态。这样,无需训练识别模型,检测过程简单且检测结果可靠,并且,能够适用于各种不同的应用场景。(The embodiment of the invention provides a motion state detection device, method and system based on wireless signals. Therefore, the recognition model does not need to be trained, the detection process is simple, the detection result is reliable, and the method can be applied to various different application scenes.)

1. A wireless signal based motion state detection apparatus, the apparatus comprising:

the calculation unit is used for calculating the change condition of the distribution of the energy of the reflection point along with the time according to the wireless reflection signal from the space where the detection object is located; and

and the determining unit is used for determining the motion state of the detection object according to the change situation of the distribution of the energy of the reflecting point along with the time.

2. The apparatus of claim 1, wherein the computing unit comprises:

the first calculation unit is used for calculating the distribution of at least one of the position information of reflection point energy relative to the detection object and the moving speed of the detection object at two moments according to a wireless reflection signal from a space where the detection object is located; and

a second calculation unit for calculating a similarity of the distributions at the two time instants.

3. The apparatus of claim 2, wherein,

the position information of the detection object includes: the distance between the detection object and the wireless signal emission source, or the coordinates of the position of the detection object after a coordinate system is established by taking the wireless signal emission source as the center.

4. The apparatus of claim 2, wherein the first computing unit comprises:

a third calculating unit, configured to perform one-dimensional fourier transform, two-dimensional fourier transform, and arrival angle estimation on the wireless reflection signal, so as to obtain energy and speed of a reflection point at the two moments and a distance between the detection object and a wireless signal emission source; and

and a fourth calculating unit, configured to calculate, from the energy and the velocity of the reflection point at the two time instants and the distance between the detection object and a wireless signal emission source, a distribution of the energy of the reflection point at the two time instants with respect to the distance between the detection object and the wireless signal emission source and the moving velocity of the detection object.

5. The apparatus of claim 2, wherein,

the two moments respectively contain a preset number of frames.

6. The apparatus of claim 1, wherein,

when the change condition of the distribution of the energy of the reflection point along with the time meets a preset condition, the determining unit determines that the detection object is in a static state.

7. The apparatus of claim 6, wherein,

the variation over time of the distribution of the energies of the reflection points is represented by the similarity of the distributions at the two moments measured by the KL divergence or the JS divergence of the distributions at the two moments,

when the KL divergence or the JS divergence is smaller than a first threshold value, the determining unit determines that the detection object is in a stationary state.

8. The apparatus of claim 1, wherein,

the calculation unit calculates the change of the distribution of the energy of all the reflection points or the reflection points with the energy larger than the second threshold value along with the time.

9. A motion state detection system, the detection system comprising:

a signal transmitting unit that transmits a wireless signal to a space in which a detection object is located;

a signal receiving unit that receives a wireless reflected signal; and

the wireless signal based motion state detection apparatus according to claim 1, which detects a motion state of the detection object from the received wireless reflection signal.

10. A method of motion state detection based on wireless signals, the method comprising:

calculating the change condition of the distribution of the energy of the reflecting points along with time according to the wireless reflecting signals from the space where the detection object is located; and

and determining the motion state of the detection object according to the change condition of the distribution of the energy of the reflection point along with the time.

Technical Field

The present invention relates to the field of information technologies, and in particular, to a device, a method, and a system for detecting a motion state based on a wireless signal.

Background

In recent years, motion state detection has been widely used in various fields. For example, human motion state detection has wide application in the fields of medical health, intelligent care, motion capture, and the like. The current society aging trend aggravates, and solitary old man's quantity sharply increases, provides dangerous motion state detection service for the old man and can in time report an emergency and ask for help when dangerous emergence, therefore has important meaning.

The human motion state detection can be performed based on video images or information collected by a wearable device integrated with an inertial sensing unit (IMU), but the human motion state detection based on video images easily violates the privacy of a detection object, and the human motion state detection based on the wearable device requires that the detection object always wears the device, which is inconvenient to use and has low recognition accuracy. For example, in an environment such as a bathroom or a toilet, it is necessary to monitor the motion state of a human body, but it is obvious that the identification method based on video images invades the privacy of a person, and the identification method based on wearable devices is inconvenient to use because the devices need to be worn.

In order to solve the above problems, there has been a human motion state detection method based on a wireless signal, which recognizes an operation by collecting a wireless signal reflected by a detection object, for example.

It should be noted that the above background description is only for the sake of clarity and complete description of the technical solutions of the present invention and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the invention.

Disclosure of Invention

The inventor finds that the existing human motion state detection method based on wireless signals is usually based on a supervised learning method, a large number of sampling samples are needed to train the recognition model, and the applicability under different scenes is not strong, so that the training process of the recognition model required by the method is complex, and the method has no universality for different scenes.

The embodiment of the invention provides a motion state detection device, a motion state detection method and a motion state detection system based on wireless signals. Therefore, the recognition model does not need to be trained, the detection process is simple, the detection result is reliable, and the method can be applied to various different application scenes.

According to a first aspect of embodiments of the present invention, there is provided a wireless signal-based motion state detection apparatus, the apparatus including: the calculation unit is used for calculating the change condition of the distribution of the energy of the reflection point along with the time according to the wireless reflection signal from the space where the detection object is located; and a determination unit for determining a motion state of the detection object according to a change over time of the distribution of the energy of the reflection point.

According to a second aspect of embodiments of the present invention, there is provided a motion state detection system, the detection system including: a signal transmitting unit that transmits a wireless signal to a space in which a detection object is located; a signal receiving unit that receives a wireless reflected signal; and the wireless signal-based motion state detection apparatus according to the first aspect of the embodiment of the present invention detects the motion state of the detection object based on the received wireless reflection signal.

According to a third aspect of the embodiments of the present invention, there is provided a motion state detection method based on a wireless signal, the method including: calculating the change condition of the distribution of the energy of the reflecting points along with time according to the wireless reflecting signals from the space where the detection object is located; and determining the motion state of the detection object according to the change condition of the distribution of the energy of the reflection point along with the time.

The invention has the beneficial effects that: the change situation of the distribution of the energy of the reflecting points along with the time is calculated according to the wireless reflection signals from the space where the detection object is located, and the motion state of the detection object is determined according to the change situation. Therefore, the recognition model does not need to be trained, the detection process is simple, the detection result is reliable, and the method can be applied to various different application scenes.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

fig. 1 is a schematic diagram of a motion state detection apparatus based on wireless signals according to embodiment 1 of the present invention;

FIG. 2 is a schematic diagram of a computing unit according to embodiment 1 of the present invention;

FIG. 3 is a diagram of a first computing unit according to embodiment 1 of the present invention;

fig. 4 is a schematic diagram of the calculated range-doppler spectrum of embodiment 1 of the present invention;

FIG. 5 is a schematic diagram of the energy distribution of the reflection point in embodiment 1 of the present invention;

fig. 6 is a schematic view of an electronic device according to embodiment 2 of the present invention;

fig. 7 is a schematic block diagram of a system configuration of an electronic apparatus according to embodiment 2 of the present invention;

fig. 8 is a schematic view of a motion state detection system according to embodiment 3 of the present invention;

fig. 9 is a schematic diagram of a motion state detection method based on wireless signals according to embodiment 4 of the present invention.

Detailed Description

The foregoing and other features of the invention will become apparent from the following description taken in conjunction with the accompanying drawings. In the description and drawings, particular embodiments of the invention have been disclosed in detail as being indicative of some of the embodiments in which the principles of the invention may be employed, it being understood that the invention is not limited to the embodiments described, but, on the contrary, is intended to cover all modifications, variations, and equivalents falling within the scope of the appended claims.