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A signal may not be detected and identified due to the presence of serious noise. Coherent integration is an important approach for focusing the energy of the signal in pulse-Doppler radar. For moving targets, the problem of migration through range cells (MTRC) will degrade the coherent integration result. This paper presents a new coherent integration method for multi-channel radar system to focus...
The quality of through-wall-radar building layout image is affected seriously by the grating lobes when the element spacing of array is bigger than half a wavelength. Moreover, the image defocusing caused by the unknown wall penetration makes the problem worse. Based on the opposite characteristics of the low-frequency phase change of wall image area and the high-frequency phase change of grating...
This paper mainly deal with the degradation of the cross-correlated back-projection (CBP) imaging quality in the case of through-wall low signal-to-noise ratio (SNR), and an improved CBP algorithm is proposed to implement high-quality through-wall-radar imaging. Through accumulating all the sampling points rather than one sampling point of the cross-correlated target echoes into target location, the...
For synthetic aperture imaging of through-wall-radar, the multi-path propagation between target and walls introduces the ghosts into the formed image. This paper proposes a new algorithm for suppressing these multi-path ghosts. A multi-path model in an enclosed building is first developed. By analyzing the model, we obtain an important feature of the multi-path ghosts to be defined as aspect dependence...
In the practical application of through-wall-radar imaging, the confronted wall is generally multi-layer and non-homogeneous, which defocuses the target image and displace target away from its true location. Therefore, the algorithm of image auto-focusing with the multi-layer and non-homogeneous wall is proposed in this paper. With respect to multiple array echoes, one best focusing time-delay is...
In the building environment of through-wall-radar imaging, multi-path clutter generates ghost images and defocuses target images, and the ambiguities of wall parameters lead to the defocusing of target images. These two problems reduce the signal-to-clutter ratio of image, which makes it difficult to robustly implement target detection in image domain. In this paper, multi-channel through-wall-radar...
This paper mainly deals with the degradation problem of dim target through multi-channel image fusion in image domain, and a method based on depth-first-searching (DFS) algorithm is proposed. To apply this method, firstly, the target image is formed by back-projection (BP) imaging. Secondly, DFS is used to find the target region automatically. Thirdly, the image of dim target is enhanced according...
Based on imaging through assumed wall parameters, an approach of target localization for through-the-wall radar in the presence of wall ambiguities is proposed. The target location is estimated by finding the maximum pixel point in composite image which is composed by image sequences corresponding to different assumed wall parameters. The proposed approach is available for target localization with...
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