Abstract
In this work, a 2-D subaperture polar format algorithm (PFA) based on stepped-chirp signal is proposed. Instead of traditional pulse synthesis preprocessing, the presented method integrates the pulse synthesis process into the range subaperture processing. Meanwhile, due to the multi-resolution property of subaperture processing, this algorithm is able to compensate the space-variant phase error caused by the radar motion during the period of a pulse cluster. Point target simulation has validated the presented algorithm.
Highlights
Synthetic aperture radar (SAR) becomes an important tool in modern remote sensing for its allweather, day and night capability to provide high-resolution maps of scene of interest
The new algorithm is evaluated with respect to the classical PFOSA which doesn’t compensate the error terms resulted from the use of stepped-chirp signals
Subapertures are overlapped to control the sidelobes; in particular, they are overlapped to control the amplitude to grating lobes due to data decimation
Summary
Synthetic aperture radar (SAR) becomes an important tool in modern remote sensing for its allweather, day and night capability to provide high-resolution maps of scene of interest. The demand for radar images is constantly pushing for finer resolutions. This quest for the resolving power has two major consequences [1,2]: first, their useful bandwidth should increase in proportion with the resolution in range. The length of the synthetic antenna should increase in proportion with the along-track resolution. The limited sampling rate of the analog to digital converters, synthetic bandwidth technique [3,4,5,6] is proposed to solve the hardware challenges of wideband radar. As compared to the commonly used wideband linear frequency modulated (LFM)
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