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To improve the range resolution of stepped-frequency SAR system, frequency difference drift should be estimated using the raw data as accurately as possible. This paper proposes a new method to estimate the accurate frequency difference drift base on frequency band synthesis. In this method, the echoes of different subband signals will be compressed firstly so as to find out point targets with strong...
In the case of high range resolution and squint angle, current chirp scaling algorithm (CSA) and nonlinear CSA (NCSA) have a finite ability to achieve high-quality images. The problem stems from a range-dependent (i.e., space-variant) cubic- and higher order terms of range frequency, which require sufficient compensation or space-variant filtering, in the phase of the synthetic aperture radar transfer...
The paper describes a novel approach combining space filtering with bandwidth synthesis to achieve wide swath and high range resolution, Firstly, Low PRF is adopted to achieve unambiguous wide swath; then space filters is used to remove azimuth ambiguity; finally sub-band signals are combined into a wider band signal to achieve high range resolution. Simulation results are provided to show the validity...
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