Signatures of Moving Target in Polar Format Spotlight Sar Image

Abstract

Abstract-The synthetic aperture radar (SAR) signatures of moving target are the basis of ground moving target detection and imaging (GMTI&Im). However, previous studies are mainly based on the 2-D separable SAR processing, and little work has been done to investigate the signatures of moving target after the application of a particular fine resolution SAR image formation algorithm. In this paper, the spectrum of moving target after polar format algorithm (PFA) processing is derived. Based on this spectrum, detailed analysis on the SAR signatures of moving target, including the geometric displacement, residual range migration, and the defocusing effect in both range and azimuth dimensions are performed. Simulation results validate the theoretical analysis.

Smear signature morphology of surface targets with arbitrary motion in spotlight synthetic aperture radar imagery

“…To enable the power series expansion of the phase function of (28), first note that the mean subaperture time t s has the form…”

“…This result applies for any target that moves with constant velocity [24]. An analytic explanation follows from a power series expansion analysis of the various phase error contributions, as has been presented in numerous works [7,24,[27][28][29][30]]. There appears to be a common perception that all moving target signatures are defocused with shapes of approximate parabolas, or more specifically, elliptic or hyperbolic curves.…”

Bandwidth Segmentation Method for Ultra-High Resolution SAR Imaging

“…As the phase error in approximate frequency algorithms [8]- [11] increases in ultra-high resolution cases, the focal quality of SAR image suffer significant degradation. The compensation for high order phase error terms [12]- [13] can be applied to improve the accuracy of these algorithms to some extent but can not resolve this problem in nature.…”

Interferometric Properties and Processing for Spaceborne Spotlight Sar

“…Spotlight SAR offers the possibility of a very high geometric resolution in the azimuth direction by sweeping the azimuth beam from forward to backward during imaging [2][3][4]. On the other hand, interferometric SAR is a powerful technique used to obtain Digital Elevation Models (DEM) in remote sensing applications [5][6][7][8][9].…”