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This paper considers the imaging problem of a target hiding behind multiple walls with known thicknesses and dielectric constants using time-division multiple-input multiple-output (MIMO) through-the-wall radar (TWR). We propose a novel back-projection-based algorithm. Specifically, we develop the signal model of one target hiding behind two parameters known walls for time-division MIMO TWR at first;...
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...
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...
This paper mainly deals with target detection under heavy clutters in through-the-wall-radar imaging, and based on random sparse array, proposes an approach of multi-channel target cooperative detection with modified N-K detector applied to multiple single-channel images.
Three-dimensional imaging can provide more detail information of the target than two-dimensional image, which can be used to identify the target. Thus, it is very useful for detecting in enclosed structures or behind the obstacle. This paper mainly research on the three-dimensional through-the-wall human imaging and introduce an approximate method to calculate the propagation delay when electromagnetic...
Regarding the liquid crystal phased array component (LCPAC) of lidar, how to select a certain amount scanning angles and make the light-beams of all scanning angles meet the scanning indexes is a brand-new problem. This paper presents a method of scanning angles screening based on a beamsteering model of binary grating, which is used to control the light-beam steering of LCPAC. According to the method,...
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