Target locating method for through-the-wall life detection radar

A target positioning and life detection technology, which is applied in the field of life detection radar system through walls, can solve the problems of large equipment size, large array size, and limited quality of carrying imaging, achieve high operating speed and accuracy, and reduce false targets Effect

Inactive Publication Date: 2018-11-06
INST OF ELECTRONICS CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

Most of the current methods for locating the target use the form of a linear array to display the position of the target through imaging. However, the size of the device is too large and it is not easy to carry, and the quality of imaging is limited by the number of array elements and the length of the baseline. Good imaging results tend to be larger array sizes

Method used

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  • Target locating method for through-the-wall life detection radar
  • Target locating method for through-the-wall life detection radar
  • Target locating method for through-the-wall life detection radar

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specific Embodiment approach

[0058] As a specific implementation, step E includes the following sub-steps:

[0059] Sub-step E1: The propagation speed of electromagnetic waves in a homogeneous medium and the law of refraction from air incident to the wall can be expressed as:

[0060]

[0061] Since the conductivity is generally small and the dispersion term can be ignored, the magnetic permeability is close to 1, and the approximate formula of the propagation velocity and the law of refraction can be obtained:

[0062]

[0063] Sub-step E2: According to the wall-penetrating positioning model of the wall-penetrating life detection radar, the quadratic equation about the refraction angle can be obtained:

[0064]

[0065] Sub-step E3: solving the refraction angle in step E2 is equivalent to solving the refraction point, and setting the coordinates of the refraction point, target, receiving antenna and transmitting antenna as:

[0066] m 0 (x 0 ,0), M 1 (x 1 ,0), M 2 (x 2 ,0), A(x,y), R 1 (...

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Abstract

The invention provides a target locating method for through-the-wall life detection radar. The target locating method comprises the following steps that step A: original signals are inputted and the original signals are arranged into a B-SCAN chart according to the channel number; step B: the static clutter and the linear trend term are removed for each path of original signal; step C: energy accumulation is performed on the life micro signal in the time domain and the peak in the energy spectrum is detected so as to determine the distance estimation value between the target and two receivingantennas; step D: FFT is performed on all the data of the slow time direction in the distance according to the distance estimation value given in the step C so as to obtain the echo frequency information of the distance and determine the distance between the target and the receiving antennas; step E: the time delay curve after wall delay correction is obtained according to the distance from the target to the two receiving antennas given in the step D; and step F: the intersection points of the time delay curve are solved to act as location estimation of the target.

Description

technical field [0001] The invention relates to the technical field of a wall-penetrating life detection radar system, in particular to a target positioning method for a wall-penetrating life detection radar. Background technique [0002] In the current process of anti-terrorism, stability maintenance, criminal investigation, etc., the life detection radar through the wall has played a lot of roles, providing first-hand information for law enforcement officers to determine whether there is a living body behind the wall and the location of the living body. Through-wall life detection radar can detect terrorists hidden in abandoned buildings or rooms and can detect and monitor the activities of suspects, grasp their activity rules, and provide accurate information for arrest operations, which has important practical significance for anti-terrorism and stability maintenance . Current life detection radars are generally single-station, which can only help rescuers determine whe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/88
CPCG01S13/888
Inventor 叶盛波陈忠诚纪奕才刘新吕晓华
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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