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Method and system for detecting weak vital sign signal of airborne radar

An airborne radar and vital sign technology, which is applied in radio wave measurement systems, measurement devices, radio wave reflection/reradiation, etc., can solve problems such as poor output results and many false targets, and reduce side lobes and avoid static False alarm, good real-time effect

Inactive Publication Date: 2020-04-17
HUNAN NOVASKY ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method and system for detecting weak vital sign signals of airborne radar, which is used to solve the problem of many false targets and poor output results due to the influence of weather and the fluctuation of the drone itself during the hovering detection of the drone. technical problem

Method used

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  • Method and system for detecting weak vital sign signal of airborne radar
  • Method and system for detecting weak vital sign signal of airborne radar
  • Method and system for detecting weak vital sign signal of airborne radar

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Embodiment 1

[0059] see figure 1 , the detection method of the weak vital sign signal of airborne radar of the present invention, comprises the following steps:

[0060] S1: Control the airborne radar to scan the target area to obtain multi-channel echo signals of the target area;

[0061] S2: Preprocessing the echo signal (such as: pulse compression, clutter suppression and channel correction, etc.), (multi-channel coherent BP imaging can be performed) to obtain multi-channel coherent superimposed image domain data.

[0062] S3: Process any one or several items of motion compensation, iterative sidelobe suppression, and strong reflection detection on the image domain data to obtain a corrected target.

[0063] In this embodiment, the motion compensation is to perform motion compensation on the echo data of each channel, including:

[0064] (1) Find independent strong scattering points in the echo data of each channel, take the motion trajectory of strong scattering points as the referen...

Embodiment 2

[0079] This embodiment is an application example of Embodiment 1, and this embodiment is Figure 5 In the experimental scene shown, the airborne radar hovers 10m to detect the actual measurement data example of the human body micro-moving target 9m away from the radar center. In this embodiment, the airborne radar uses an antenna array with 2 transmissions and 4 receptions.

[0080] Through the detection method of the weak vital sign signal of the airborne radar of embodiment 1, the data acquired in the process are as follows:

[0081] Figure 6 is a schematic diagram of the two-dimensional results of the echo signal preprocessed by pulse compression correction in step S2;

[0082] Figure 7 It is a schematic diagram of the SAR imaging result after iterative sidelobe suppression in step S3;

[0083] Figure 8 It is a display effect diagram of the radar interface that outputs the number of targets and their real-time positions in step S4.

[0084] As can be seen from the a...

Embodiment 3

[0086] The present invention also provides a computer system, including a memory, a processor, and a computer program stored in the memory and operable on the processor. When the processor executes the computer program, the steps in any of the above embodiments are realized.

[0087] In summary, the present invention integrates the UAV platform and radar by performing motion compensation, iterative sidelobe suppression, and strong reflection detection on the image domain data, and can accurately detect and locate micro-moving human targets in the target area, and radar detection The speed is fast and the efficiency is high. It can invert the position of wall corners, ground and large obstacles, and can filter out static false alarms caused by walls and ground. The invention performs multiple noise reduction filtering processes, and has short time consumption, good real-time performance, stable and perfect algorithm.

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Abstract

The invention discloses a method and system for detecting a weak vital sign signal of an airborne radar. The method comprises steps controlling the airborne radar to scan a target region, and obtaining a multichannel echo signal of the target region; preprocessing the echo signal to obtain multi-channel coherently superimposed image domain data; making image domain data be subjected to processingof any one or more of motion compensation, iterative side lobe suppression and strong reflection detection to obtain a corrected target; and detecting and tracking the positions of targets, and outputting the number and real-time positions of the targets. The method is advantaged in that an unmanned aerial vehicle platform and the radar are integrated, a micro human body target in the target areacan be accurately detected and positioned, static false alarms caused by the wall and the ground can be filtered out, the radar detection speed is high, and radar detection efficiency is high.

Description

technical field [0001] The invention relates to the field of radar signal processing, in particular to a method and system for detecting weak vital sign signals of airborne radar. Background technique [0002] Airborne radar is penetrative, all-day and all-weather. It can detect target areas through non-metallic media such as walls, and can go to dangerous areas that rescuers cannot reach without terrain restrictions. Through a series of signal processing on the echo signal in the target area, it can detect and track multiple micro-moving human targets, so it is widely used in the fields of earthquake and landslide post-disaster rescue. [0003] However, during the hovering detection process of the UAV, due to the influence of meteorological interference and the turbulence of the UAV itself, yaw, pitch angle changes and roll, etc. will often occur, and these changes will generate phase errors and greatly affect the signal processing output. result quality. The existing air...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S13/90
CPCG01S7/411
Inventor 杨博王生水唐良勇
Owner HUNAN NOVASKY ELECTRONICS TECH
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