CN216052182U

CN216052182U - Life detection equipment based on beam scanning

Info

Publication number: CN216052182U
Application number: CN202121931130.9U
Authority: CN
Inventors: 陈鹏; 孟帆; 陈志敏; 朱秉诚
Original assignee: Nanjing Lekaisen Technology Co ltd; Nanjing Minzhida Technology Co ltd
Current assignee: Nanjing Lekaisen Technology Co ltd; Nanjing Minzhida Technology Co ltd
Priority date: 2021-08-18
Filing date: 2021-08-18
Publication date: 2022-03-15
Anticipated expiration: 2031-08-18

Abstract

The utility model discloses a life detection device based on beam scanning, which comprises: a support; the antenna is arranged at the upper end of the bracket; the radio frequency and signal processing unit is arranged on the bracket and used for sending radio frequency signals to the antenna or receiving echo signals received by the antenna; and the beam scanning control module is used for realizing scanning type detection of a large-area by changing the beam direction of the radio-frequency signal emitted by the antenna. According to the device, the antenna is elevated through the support, the detection range is expanded, the change of the pointing direction of the beam of the electromagnetic wave radiated by the antenna is controlled in a mechanical or electric control mode, the beam scanning function is realized, the rapid large-area beam detection is realized, and the beam detection efficiency is obviously improved.

Description

Life detection equipment based on beam scanning

Technical Field

The utility model relates to a life detection radar, and mainly relates to a radar framework, an antenna and a radio frequency design.

Background

When natural disasters such as conflagration, earthquake, debris flow take place, very easily cause personnel stranded, in time save stranded personnel, grasp gold 72 hours, can effectively promote stranded personnel's survival probability. In order to accurately detect and locate trapped persons, the prior art mainly includes the following three categories:

1) the method comprises the steps that detection equipment based on audio and video judges whether trapped people exist in a certain area or not through video and sound information;

2) the detection equipment based on the vibration sensor judges whether trapped people exist or not by detecting vibration information;

3) the radar detection equipment based on the radar Doppler frequency and imaging realizes the capture of motion information (breathing heartbeat, limb motion and the like) through electromagnetic waves, or realizes high-resolution imaging after ruins, thereby realizing the detection of trapped people.

The radar detection equipment has stronger penetrating capability, so the radar detection equipment is more effective in the detection process of trapped people. However, the existing radar life detection equipment needs to be tightly attached to the ruins, only the area with the size of the radar can be detected, generally about 1 square meter, but the actual ruins needing to be detected can be thousands of square meters, the detection efficiency is low, the best rescue time is taken, and extra casualty loss is brought.

Disclosure of Invention

The utility model aims to provide life detection equipment based on beam scanning, which can rapidly scan life characteristics in a large range so as to improve the detection efficiency of trapped people in the ruins in a large area.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

a beam scanning based life detection device, comprising:

a support;

the antenna is arranged at the upper end of the bracket;

the radio frequency and signal processing unit is arranged on the bracket and used for sending radio frequency signals to the antenna or receiving echo signals received by the antenna;

and the beam scanning control module is used for realizing scanning type detection of a large-area by changing the beam direction of the radio-frequency signal emitted by the antenna.

Different from the existing radar, the main innovation point of the utility model is that the scanning type detection of a large-area is realized by changing the beam direction of electromagnetic waves, the life detection speed is improved, the radar equipment is prevented from being moved in the detection process of the existing life detection radar, and the defects of low detection speed and complex operation are overcome.

The antenna can be realized by an antenna array consisting of a plurality of antennas, and can also be realized by a single antenna with high gain. Aiming at a single antenna or an array antenna, the antenna can be realized on a bracket by using mechanical structures such as motor rotation and the like; in addition, for the array antenna, the amplitude or the phase of the electromagnetic wave radiated by each antenna can be controlled in an electric control mode. The electronic control mode beam scanning can be realized by controlling analog devices such as a phase shifter, an attenuator and the like in the radio frequency unit, and can also be realized by adopting a digital mode such as a multiplier, a delayer and the like in the signal processing unit.

The display control engine divides the detection area into a plurality of smaller areas, can control beam scanning to detect each area, and marks the existence of the vital sign signals based on the detection result.

Drawings

FIG. 1 is a block diagram of one implementation of a fast life detection device based on beam scanning;

FIG. 2 is a block diagram of one implementation of a radar host.

Detailed Description

A fast life detection device based on beam scanning is shown in figure 1, a radar host 2 mainly comprises an antenna 1, a radio frequency and signal processing unit 3, a wireless data transmission unit 4 and the like, and the other parts comprise a support 5, a wireless data transmission unit 6, a display control machine 7 and the like.

The antenna 1 may be a high gain single antenna or an antenna array of multiple antennas for transmitting and receiving signals. The received signal is an echo signal, and the transmitted signal is a radio frequency signal.

And the radio frequency and signal processing unit 3 is used for generating radio frequency signals and processing echo signals.

And the radio frequency and signal processing unit 3 comprises a transmitting channel and a receiving channel. The transmitting channel comprises a circulator 301, an amplifier 302, a phase shifter 303, a controllable attenuator 304 and a signal source 305, wherein the signal source 305 generates a broadband signal and finally enters the antenna 1 after passing through the circulator 301; the receiving channel includes a circulator 301, an amplifier 302, a phase shifter 303, a controllable attenuator 304, a mixer 306, a filter 307, an analog-to-digital converter 308, and a signal processing board 309, and the echo signal received by the antenna 1 sequentially passes through the circulator 301, the amplifier 302, the phase shifter 303, the controllable attenuator 304, the mixer 306, the filter 307, and the analog-to-digital converter 308, and then enters the signal processing board 309. The circulator 301 realizes the antenna sharing function during the radar detection, the amplifier 302 is used for developed weak electromagnetic wave signals, the phase shifter 303 and the controllable attenuator 304 respectively realize the control of the phase and the amplitude of the electromagnetic wave, the mixer 306 realizes the conversion of radio frequency electromagnetic wave signals into low frequency signals, the filter 307 is used for filtering out-of-band noise and interference, the analog-digital converter 308 realizes the conversion of analog signals into digital signals, and the digital signal processing in the signal processing board 309 is convenient to realize the digital signal processing subsequently. A broadband signal is generated by signal source 305 for vital sign detection and the depth of the trapped person can be detected.

The controllable attenuator 304 and the phase shifter 303 are included in both the transmit and receive channels, so that beam scanning for both transmission and reception can be achieved. The beam scanning process is achieved by controlling the phase shifter 303 and the controllable attenuator 30.

Aiming at a single antenna or an array antenna, the beam direction can be changed on the bracket by using mechanical structures such as motor rotation and the like, so that the scanning type detection process is realized. In addition, for the array antenna, the amplitude or the phase of the electromagnetic wave radiated by each antenna can be controlled in an electric control mode.

And the display controller 7 is used for carrying out two-dimensional Fourier transform on the received signal to obtain a Doppler frequency spectrum graph and displaying the Doppler frequency spectrum graph.

The detection area is divided into a plurality of small areas, and the electromagnetic wave beams are controlled to scan on each small area so as to realize the process of rapid life detection.

The antenna 1 may be a single high-gain antenna or an antenna array formed by multiple antennas. When a single antenna is adopted, only mechanical structures such as a motor and the like can be arranged on the bracket 5 to realize the control of beam pointing; when the antenna array is adopted, the beam pointing can be controlled through a mechanical structure, and the beam pointing can also be controlled in an electric control mode, namely, the electromagnetic wave radiation pointing is changed by controlling the amplitude and the phase of the electromagnetic wave on each antenna.

After receiving the echo signal, the radar host sends the echo signal to the wireless data transmission module 4 after signal processing, transmits the data to the wireless data transmission module 6, and further transmits the data to the display controller 7 for processing and displaying. In addition, the control process is the reverse process, and the control command is transmitted from the display controller 7 to the radar main body 2 through wireless data.

Claims

1. A beam scanning based life detection device, comprising:

a support;

the antenna is arranged at the upper end of the bracket;

the beam scanning control module is used for realizing scanning type detection of a large-area by changing the beam direction of a radio frequency signal sent by the antenna;

the radio frequency and signal processing unit comprises a transmitting channel and a receiving channel, wherein the transmitting channel comprises a circulator, a first amplifier, a first phase shifter, a first controllable attenuator and a signal source, and the signal source generates a broadband signal and finally enters the antenna after passing through the circulator; the receiving channel comprises a circulator, a second amplifier, a second phase shifter, a second controllable attenuator, a frequency mixer, a filter, an analog-digital converter and a PCB (printed Circuit Board), wherein echo signals received by the antenna sequentially pass through the circulator, the second amplifier, the second phase shifter, the second controllable attenuator, the frequency mixer, the filter and the analog-digital converter and then enter the PCB; further comprising:

the display control machine receives the signals of the radio frequency and signal processing unit;

a data transmission module; the display controller is used for data transmission between the radio frequency and signal processing unit and the display controller.

2. The beam scanning based life detection device of claim 1, wherein said antenna is a single antenna or an antenna array of multiple antennas.

3. The life detection device of claim 2, wherein the beam scanning control module is a mechanical structure for driving the antenna to rotate.

4. The beam scanning based life detection apparatus of claim 1, wherein the display control engine is configured to divide the detection area into a plurality of areas and control the beam scanning to detect each area.

5. The life detection device based on beam scanning of claim 1, wherein the beam scanning control module is an electronic control module, and the electronic control module controls the amplitude and the phase by controlling an attenuator and a phase shifter of electromagnetic waves radiated by each antenna.

6. The life detection device based on beam scanning of claim 1, wherein a multiplier and a delayer are further arranged in the radio frequency and signal processing unit, and the multiplier and the delayer are used for realizing beam scanning control through multiplication operation of the multiplier and delay operation of the delayer.