Focusing of Spotlight Tandem-Configuration Bistatic Data with Frequency Scaling Algorithm

Shichao Chen,Ming Liu,Jun Wang,Mengdao Xing,Fugang Lu

doi:10.1155/2016/3251082

Abstract

A frequency scaling (FS) imaging algorithm is proposed for spotlight bistatic SAR data processing. Range cell migration correction (RCMC) is realized through phase multiplication. The proposed algorithm is insensitive to the length of the baseline due to the high precision of the point target (PT) spectrum that we are based on. It is capable of handling bistatic SAR data with a large baseline to range ratio. The algorithms suitable for small and high squint angles are both discussed according to whether the range dependence of the second range compression (SRC) can be neglected or not. Simulated experiments validate the effectiveness of the proposed algorithm.

Highlights

Bistatic synthetic aperture radar (SAR) imaging has been widely discussed in recent years [1,2,3,4]
Taking Case I for illustration, the profile error caused by the linear approximation of the range cell migration (RCM) (6) is shown in Figure 4, which is far less than the range resolution
An frequency scaling (FS) algorithm suitable for tandem bistatic SAR in spotlight mode is proposed, which is insensitive to the baseline to range ratio

Summary

Introduction

Bistatic synthetic aperture radar (SAR) imaging has been widely discussed in recent years [1,2,3,4]. The time domain method is the best in theory, it accomplishes optimum reconstruction with heavier computational burden than the frequency domain imaging algorithms [7,8,9]. The accurate analytical PT spectrum is the precondition of designing most fast bistatic imaging algorithms in the frequency domain, and some effective spectra in the frequency domain have been presented recently [13,14,15,16,17], and many imaging algorithms have been proposed based on them. A frequency scaling (FS) imaging algorithm is proposed in this paper for bistatic SAR imaging in spotlight mode based on the spectrum presented in [20].

Geometry Relationship and Signal Model of Spotlight Bistatic SAR

Bistatic FS Algorithm

Simulation Results

Conclusion