A Robust Tracking Method for Through-Wall Radar Multi-target Image Domain

A through-the-wall radar and multi-target technology, which is applied in the direction of instruments, measuring devices, and re-radiation, can solve the problems of high computational complexity, no tracking, and unsuitability for practical applications in imaging algorithms, and achieve good real-time performance and easy handling , the effect of suppressing the influence of grating lobes

Active Publication Date: 2022-05-31
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

The idea of ​​post-imaging tracking is used in the document "A new measurement method for through-the-wall detection and tracking of moving targets.Measurement, vol.46, pp.1834-1848, 2013.", but the computational complexity of the imaging algorithm is relatively high , the tracking algorithm is relatively simple, not suitable for practical application
Judging from the published literature, there is no fast and real-time method for tracking multiple high-mobility targets behind the wall after imaging

Method used

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  • A Robust Tracking Method for Through-Wall Radar Multi-target Image Domain
  • A Robust Tracking Method for Through-Wall Radar Multi-target Image Domain
  • A Robust Tracking Method for Through-Wall Radar Multi-target Image Domain

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Embodiment Construction

[0033] Step 1: Quick Imaging Steps

[0034] Detection scenarios such as figure 2 shown, the target lies in the thickness and relative permittivity of d, respectively w and ε behind the wall, whose coordinates are T(x tar ,y tar ) using time division MIMO (multiple-input-multiple-output) antenna array, the antenna array of M transmitting antennas and N receiving antennas is placed parallel to the wall, and the distance from the front wall surface is d 3 ; for the i-th transmit antenna and the j-th receive antenna, A i , B i , C j , D j is the point of refraction during the propagation of electromagnetic waves, then is the path in the process of electromagnetic wave propagation; the transmitted signal s(t) is the step-frequency continuous wave signal. For the i-th transmitting antenna and the j-th receiving antenna, the obtained echo signals are:

[0035] y ij (t)=σ T s(t-τ ij )+ψ ij (t)

[0036] where σ T represents the reflection coefficient of the target, τ i...

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Abstract

The invention discloses a multi-target image domain robust tracking method for through-wall radar, relates to the technology of through-wall radar, in particular to the multi-target detection and tracking technology of through-wall radar. The invention provides an image domain tracking algorithm suitable for multi-target after through-wall radar imaging. Rapid imaging within a certain allowable error can obtain higher quality imaging results; the image enhancement algorithm based on PCF weighting processing can effectively suppress the influence of grating lobes and enhance the target; the target template creation algorithm based on biaxial projection can effectively extract the target Feature information to prepare for tracking; the image domain tracking algorithm based on mean shift and Kalman filter can effectively deal with the problem of target image expansion and deformation, and can easily deal with the problem of target occlusion, with high tracking accuracy. Therefore, the present invention has the advantages of good real-time performance and high tracking precision, and can be directly applied to wall-penetrating radar equipment.

Description

technical field [0001] The invention relates to a through-wall radar technology, in particular to a multi-target detection and tracking technology of the through-wall radar. Background technique [0002] Through-wall radar is a special equipment that transmits electromagnetic waves in a specific frequency band to penetrate buildings, and receives scattered echo data of targets such as human bodies behind buildings to achieve imaging detection and tracking of hidden targets. And civil aspects are more and more widely used. Because the building wall will change the propagation path and speed of the electromagnetic wave emitted by the radar, the echo delay error caused by it will cause the defocusing of the target image after imaging, the position offset and the multipath phantom. The above target image will further affect target extraction and target data association in subsequent detection and tracking algorithms. In addition, the high maneuverability of moving targets behi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/66G01S13/88
CPCG01S13/66G01S13/888
Inventor 崔国龙陈国浩曹凌霄李虎泉肖新剑郭世盛孔令讲杨晓波易伟张天贤
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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