A method for real-time tracking of multi-moving targets by through-wall radar in complex environment

A multi-moving target and complex environment technology, applied in the field of real-time tracking of multi-moving targets by through-wall radar in a complex environment, can solve the problems of difficult to identify real targets, confusion, etc.

Inactive Publication Date: 2019-12-10
WUHAN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

The main reason for this technical difficulty is that in the scene of multiple moving targets, the real echo signals of each ta

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  • A method for real-time tracking of multi-moving targets by through-wall radar in complex environment
  • A method for real-time tracking of multi-moving targets by through-wall radar in complex environment

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Embodiment Construction

[0037] 1. Theoretical basis

[0038] In a complex environment, the echo signal of the through-wall radar is very complicated. First of all, due to the multipath effect, the echo signals of false targets under multipath propagation in multi-target scenarios are mixed with the echo signals of other real targets, and it is difficult to distinguish them. Therefore, the echo signals of radar multipath propagation Features are very complex. Secondly, in the actual scene, due to the interference of uncontrollable factors such as the surrounding environment and electromagnetic interference, the situation that the echo signal of the real target is mixed with the echo signal of the false target and other noises is more complicated. In order to make the through-wall radar practical, the echo signal collected by the through-wall radar must go through a series of processing to extract and track the shadowed target. The block diagram of the signal processing is shown in the attached figur...

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Abstract

The invention provides a method of a through-the-wall radar for multi-moving target real-time tracking in complex environment. First a Kalman filter is utilized to predict the positions and energy ofall trajectories at a current moment, two neighborhood domains with position and energy predicted values as centers are built respectively, and all targets in the two neighborhoods at the same time are associated with the corresponding trajectory; an improved nearest neighborhood domain method based on position and energy information and a bipartite graph maximum weight matching algorithm are thenutilized to find out a target realizing optimal matching with each motion trail among the associated targets; then current states of the trajectories are judge according to trajectory quality based on a log-likelyhood ratio, thereby determining trajectory maintenance, new trajectory generation or trajectory deletion; and finally, the Kalman filter is utilized to perform smooth processing on an existing trajectory. The method provided by the invention is simple and is high in execution efficiency, is suitable for tracking of multiple moving human body targets by a portable through-the-wall radar through partition walls, and can effectively improve work efficiency of the wall-penetrating radar.

Description

technical field [0001] The invention belongs to the technical field of through-wall radar, in particular to a method for real-time tracking of multi-moving targets by through-wall radar in complex environments. Background technique [0002] Through the Wall Radar (TWR) is an important device capable of penetrating obstacles to detect targets, because of its strong penetrating characteristics, high resolution and long detection distance. Widely used in military, anti-terrorism, disaster relief, medical, security, security and other fields. The basic principle is: the electromagnetic wave is transmitted through the radar transmitting antenna. When the electromagnetic wave penetrates the wall and encounters an object such as a human body with a different dielectric constant from the air, it will be reflected and scattered to form a radar echo. The echo is received by the receiving device and processed by the relevant signal and then imaged, which can well realize the detection...

Claims

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Application Information

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IPC IPC(8): G01S13/88G01S7/41
CPCG01S7/41G01S13/888
Inventor 陈小莉田茂李永辉
Owner WUHAN UNIV
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