CN210961972U

CN210961972U - Personnel life safety wireless monitoring system

Info

Publication number: CN210961972U
Application number: CN201921049161.4U
Authority: CN
Inventors: 熊玉勇; 彭志科; 李松旭; 王冬
Original assignee: Shanghai Jiaotong University
Current assignee: Shanghai Jiaotong University
Priority date: 2019-07-03
Filing date: 2019-07-03
Publication date: 2020-07-10
Anticipated expiration: 2029-07-03

Abstract

The utility model discloses a personnel's life safety wireless monitoring system relates to personnel's life safety monitoring technology field, including microwave radar transceiver, signal conditioning module, data acquisition module, signal processing module and safe discrimination module, each module is connected gradually through the hardware. The utility model discloses can realize the monitoring to airtight space personnel life safety, have advantages such as monitoring performance is reliable and stable, non-contact, low power dissipation, small, be convenient for and current system integration.

Description

Personnel life safety wireless monitoring system

Technical Field

The utility model relates to an personnel's life safety monitoring technology field especially relates to a personnel's life safety wireless monitoring system.

Background

The monitoring of the life safety of personnel is of great importance to industrial production, life and the like, and has important practical significance and actual requirements for the life safety monitoring of workers in a closed space. At present, the technology for monitoring the life safety of people is divided into a contact type monitoring technology and a non-contact type monitoring technology. The contact monitoring mainly comprises the steps that related sensors are worn on monitored personnel, and vital signs, behaviors and the like of the personnel are distinguished by utilizing sensor information. Common touch sensors include accelerometers, respiratory belts, and wearable sensors, among others. The non-contact monitoring mainly adopts perception and monitoring based on vision, records video through a camera, and distinguishes behaviors and states of people through image processing.

However, the contact monitoring technology is used for monitoring the life safety of people by wearing sensors such as an accelerometer and a bracelet, and often requires networking sensing of a plurality of sensors, so that the normal work and comfort of people are easily affected, and risks such as forgetting to wear exist. The personnel life safety monitoring based on vision in the non-contact monitoring technology is sensitive to light, the signal processing calculated amount is large, and the personnel life safety monitoring in a closed space has large limitation and privacy protection problem.

Therefore, those skilled in the art are dedicated to develop a wireless monitoring system for personal life safety, which can realize non-contact sensing and identification of vital signs and behaviors of persons in an enclosed space, and monitor and safely identify possible behaviors such as falls and abnormal states of the vital signs.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defects of the prior art, the technical problem to be solved in the utility model is how to monitor and distinguish the life safety of personnel in the closed space.

In order to achieve the above object, the utility model provides a personnel life safety wireless monitoring system, including microwave radar transceiver, signal conditioning module, data acquisition module, signal processing module and safe discrimination module, each module is connected gradually through hardware.

Further, the microwave radar transceiver includes a radio frequency signal source, an antenna, amplification, filtering, and mixing hardware.

Further, the microwave radar transceiver is a continuous wave radar transceiver.

Further, the continuous wave radar transceiver is a frequency modulated continuous wave radar transceiver.

Further, the signal conditioning module comprises a filtering and amplifying circuit.

Further, the filter circuit is a low-pass filter circuit.

Further, the signal processing module comprises a behavior monitoring sub-module and a vital sign monitoring sub-module.

Further, the behavior monitoring sub-module is a module for performing micro-Doppler feature extraction on the range unit signal where the person is located by adopting short-time Fourier transform.

Further, the safety discrimination module is a module for safely discriminating the state of the person processed by the signal processing module.

Furthermore, the signal conditioning module function can also be integrated in the signal processing module, and the signal processing module can realize the filtering and amplifying functions of the acquired signal.

The utility model discloses can monitor personnel's action (especially tumble) and vital sign information respectively according to airtight space personnel motion and two kinds of states of quasi-static state, and then differentiate whether personnel are safe.

Compared with the prior art, the utility model discloses can realize the monitoring of non-contact's personnel actions such as tumble to and human vital sign's wireless monitoring, effectively solved airtight space personnel's life safety's monitoring, have advantages such as monitoring stable performance is reliable, non-contact, low power dissipation, small, be convenient for with current system integration.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.

Drawings

Fig. 1 is a block diagram of the logic structure of a preferred embodiment of the present invention.

Detailed Description

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings for clarity and understanding of the technical contents. The present invention may be embodied in many different forms of embodiments, and the scope of the invention is not limited to the embodiments described herein.

Example 1

As shown in fig. 1, the wireless monitoring system for personnel life safety in this embodiment includes a microwave radar transceiver, a signal conditioning module, a data acquisition module, a signal processing module, and a safety discrimination module, which are connected in sequence through hardware. The microwave radar transceiver comprises a radio frequency signal source, an antenna, amplification, filtering and mixing hardware, the signal conditioning module comprises a filtering and amplifying circuit, and the signal processing module comprises a behavior monitoring submodule and a vital sign monitoring submodule.

Preferably, the microwave radar transceiver is a frequency modulation continuous wave microwave radar transceiver, is installed at a certain position in the closed space, and obtains the baseband signal by transmitting electromagnetic waves, receiving echo signals reflected by a human body, and performing hardware processing such as amplification, filtering and frequency mixing of the radar transceiver. Then, the baseband signal is processed by signal amplification and low-pass filtering through a signal conditioning module. The data acquisition module synchronously acquires baseband signals and modulation wave signals and then inputs the baseband signals and the modulation wave signals to the signal processing module.

The signal processing module processes the baseband signal output by the data acquisition module, extracts the micro Doppler characteristic, and judges whether the state of the personnel is a motion state or a quasi-static state according to the energy distribution of the micro Doppler characteristic. And if the person is in a moving state, judging whether the person has falling behavior according to a micro Doppler characteristic form generated by the movement of the person. And if the human body is in a quasi-static state, extracting fluctuation micromotion information of the human body thorax, and estimating the amplitude and the frequency of the respiration and heartbeat frequencies.

The specific signal processing process comprises the steps of firstly extracting time domain range profile information, further eliminating background static clutter interference, and then extracting micro Doppler characteristics of range unit signals where the personnel are located. The extraction method of the micro-Doppler features is preferably short-time Fourier transform. And preliminarily identifying that the person is in a motion state or a quasi-static state by judging the time-frequency energy distribution of the micro Doppler features. And if the time-frequency energy distribution of the micro Doppler features caused by the trunk of the person is concentrated at the zero frequency, judging the state as a quasi-static state, otherwise, judging the state as a motion state. If the person is in a motion state, the behavior monitoring submodule is operated, and by judging the change of the micro Doppler characteristic on a time axis, if severe Doppler frequency shift change occurs in a short time, the person is identified as falling behavior; if the person is in a quasi-static state, the vital sign monitoring submodule is operated, and the respiratory and heartbeat amplitude and frequency information of the human body is extracted by measuring the fluctuation and micromotion information of the chest wall and the back caused by the respiratory and heartbeat motion of the human body.

The safety identification module is used for carrying out safety identification on the basis of the personnel state information processed by the signal processing module, and if the falling behavior is monitored, the safety identification module is judged to be dangerous; if the respiratory amplitude and the heartbeat amplitude and the frequency of the person in the quasi-static state are monitored to be abnormal, judging the person to be dangerous; otherwise, it is determined as safe.

Example 2

Based on embodiment 1, the functions of the signal conditioning module are integrated into the signal processing module, and the signal processing module is used to implement the processing of filtering, amplifying and the like of the radar baseband signal, so that the signal conditioning module in the system can be removed, thereby simplifying the hardware structure of the system.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the teachings of this invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. A wireless monitoring system for personnel life safety is characterized by comprising a microwave radar transceiver, a signal conditioning module, a data acquisition module, a signal processing module and a safety judgment module, wherein the modules are sequentially connected through hardware.

2. The wireless personal life safety monitoring system of claim 1, wherein the microwave radar transceiver includes a radio frequency signal source, an antenna, amplification, filtering and mixing hardware.

3. Wireless personal life safety monitoring system according to claim 2, wherein said microwave radar transceiver is a continuous wave radar transceiver.

4. The wireless personal life safety monitoring system of claim 3, wherein said continuous wave radar transceiver is a frequency modulated continuous wave radar transceiver.

5. The wireless personnel life safety monitoring system of claim 1, wherein said signal conditioning module comprises filtering and amplification circuitry.

6. The wireless personal life safety monitoring system of claim 5, wherein said filter circuit is a low pass filter circuit.

7. The wireless personnel life safety monitoring system of claim 1, wherein said signal processing module comprises a behavior monitoring sub-module and a vital signs monitoring sub-module.

8. The wireless monitoring system for life safety of people as claimed in claim 7, wherein the behavior monitoring sub-module is a module for performing micro Doppler feature extraction on the distance unit signal where the people are located by using short-time Fourier transform.

9. The wireless monitoring system for human life safety according to claim 1, wherein the safety discrimination module is a module for performing safety discrimination on the human state processed by the signal processing module.

10. The wireless monitoring system for personnel life safety according to any one of claims 1-9, wherein the function of the signal conditioning module can also be integrated into the signal processing module, and the signal processing module can be used for realizing the functions of filtering and amplifying the collected signals.