Abstract
A focusing solution for bistatic forward-looking synthetic aperture radar (BFSAR) is presented. Forward-looking imaging is highly desirable in some potential applications, such as self-landing in bad weather, military surveillance, and navigation. Unfortunately, monostatic synthetic aperture radar reaches its limit when it is used in a forward-looking configuration. BFSAR can provide a high-resolution image in the forward-looking direction. However, due to the special forward-looking geometry, many proposed methods of deriving a bistatic point target reference spectrum (BPTRS) cannot handle the BFSAR data well. A modified Loffeld's bistatic formula (MLBF) for a forward-looking configuration is proposed first; it can get an accurate BPTRS of BFSAR. Then, a chirp scaling algorithm (CSA) based on MLBF is derived. CSA without interpolation allows high performance. Numerical simulations show that the proposed focusing solution can handle the BFSAR data well and achieve a high- resolution focused image. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI. (DOI: 10.1117/1.JRS.8.083586)
Highlights
Bistatic forward-looking synthetic aperture radar (BFSAR) has two platforms installed with a transmitter and receiver, respectively
Forwardlooking imaging is highly desirable in some applications, but it has been a blind sector for monostatic synthetic aperture radar (SAR)[1,2,3] for a long time
The first experiment is to determine whether the bistatic point target reference spectrum (BPTRS) obtained by the modified Loffeld’s bistatic formula (MLBF) is appropriate for the BFSAR case and to simultaneously compare the performance of the MLBF with those of other proposed methods
Summary
Bistatic forward-looking synthetic aperture radar (BFSAR) has two platforms installed with a transmitter and receiver, respectively. Based on the extended Loffeld’s bistatic formula (ELBF) method,[11] a range-Doppler algorithm is developed.[12] But the ELBF method has its limitations in representing the bistatic point target reference spectrum (BPTRS). Ma et al.: Focusing bistatic forward-looking synthetic aperture radar based on modified Loffeld’s bistatic. To develop new frequency-domain imaging algorithms, we have to obtain the BPTRS of BFSAR first. Due to the series form, it is not easy for MSR to be used for imaging algorithm deduction, especially for chirp scaling and Omega-k algorithms.[17] The Loffeld’s bistatic formula (LBF) was first introduced in Ref. 18. Numerical simulations were carried out to validate the focusing solution for BFSAR
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