The Analyses for Discretization behaviour of Line Segment Target in SAR Image

Under the assumption of the point scattering model, traditional SAR imaging processing can depict the scattering features of the illuminated scene with a series of strong point scatterers. In the traditional SAR images, when the illuminated scene contains various line segment targets, only some line segment targets show line-segment-scattering features, whereas others are discretized into strong point scatterers. This discretization behaviour of line segment targets makes it difficult to interpret the factual geometrical structure of the line segment targets through SAR images. Unfortunately, neither the traditional point scattering model and imaging processing can provide a detailed analysis for the discretization behaviour of line segment targets. Hence, in this paper, we propose some detailed and comprehensible analyses for this problem from three aspects. First, by introducing the spatial spectrum analysis of SAR imaging, we provide an azimuth analysis for this problem from the perspective of the imaging system. Then, we analyse this problem from the range direction based on the high resolution range profile of received echo. Furthermore, through establishing a parametric model for the line segment targets, a comprehensive analysis for the problem is given based on the scattering features. Numerical simulation experiments demonstrate the effectiveness of our proposed analyses.