An Efficient Backprojection Algorithm Based on Wavenumber-Domain Spectral Splicing for Monostatic and Bistatic SAR Configurations

Abstract

This paper introduces a fast backprojection synthetic aperture radar (SAR) imaging algorithm based on wavenumber-domain spectral splicing. The traditional fast backprojection (FBP) algorithm establishes the polar coordinate system with the center of the sub-aperture as the origin. Therefore, the coordinates of the image obtained from each sub-aperture are different. Sub-aperture images must be projected to a uniform coordinate system before they can be coherently superimposed to form the final image, which requires a large amount of calculation. In order to deal with this problem, this paper proposes a novel imaging method, which uses the same polar coordinate system for each sub-aperture. The sub-aperture images are then spliced in the wavenumber-domain, and directly added after upsampling. This method avoids the projection from each sub-aperture to the uniform coordinate system, thus improving the imaging accuracy and efficiency. At the same time, the algorithm is suitable for various configurations, and can achieve good imaging results for bistatic forward-looking SAR and high-speed mobile platform. Finally, simulations are presented to demonstrate the effectiveness of the algorithm.

An Estimation and Compensation Method for Motion Trajectory Error in Bistatic SAR

“…By correcting the bistatic SAR 3D trajectories of the transmitter and the receiver with the estimated trajectory error, a well-focused BiSAR image could be achieved by performing imaging algorithms which are suitable for arbitrary motion, such as time-domain imaging algorithms [48,49] or generalized wavenumber-domain imaging algorithms [50,51].…”

MuA-SAR Fast Imaging Based on UCFFBP Algorithm with Multi-Level Regional Attention Strategy

“…L Zhang et al, established a unified polar coordinate (UPC) system to complete the projection of sub-apertures, and proposed accelerated fast back projection (AFBP) [37]. Based on UPC, H Sun et al proposed a wavenumber domain fast back projection (WFBP) method to achieve fast imaging of monostatic and bistatic SAR systems [38]. They improved imaging efficiency and performance by fusing wavenumber spectra (WS).…”