Abstract
Based on an exact analytical bistatic point target spectrum, an efficient chirp-scaling algorithm is proposed to correct the range cell migration of different range gates to the one of the reference range for tandem bistatic synthetic aperture radar data processing. The length of the baseline (baseline to range ratio) does not give a direct influence to the proposed algorithm, which can be applied to the processing of tandem bistatic data with a large baseline even when the baseline is equal to the range. No interpolation is needed during the entire processing, only fast Fourier transforms and phase multiplications are needed, which result in efficiency. The validity of the proposed algorithm has been verified by simulated experiments.
Highlights
Due to the wide applications of bistatic synthetic aperture radar (SAR), much attention has been paid to it [1,2,3]
Just as the monostatic case, no interpolation operation is performed during the whole process, which improves the effectiveness of the imaging process and guarantees the focusing quality. It is capable of dealing with bistatic SAR data in tandem configuration without the influence of the length of the baseline, even in the extreme situation when the baseline is equal to the range
To compare the computational burden with the proposed frequency domain imaging algorithm, we estimate the floating point operations (FLOPs) required by each processing step, we define μDBP the number of FLOPs that is needed for each back-projection in the range direction, while μINT the number of FLOPs that is needed for the interpolation of two grids into a new one of the elliptical coordinate throughout the stages of the bistatic fast factorized backprojection (BFFBP) algorithm
Summary
Due to the wide applications of bistatic synthetic aperture radar (SAR), much attention has been paid to it [1,2,3]. 4. Simulations Table 1 (T in the brackets represents the transmitter and R represents the receiver) illustrates the parameters of bistatic SAR in tandem configuration with equal velocity vectors in two cases with different baselines (baseline to range ratio).
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