Space‐variant RCMC method for squint beam‐steering SAR imaging on high‐speed manoeuvring platforms

The focusing of squint beam‐steering synthetic aperture radar (SAR) data is a challenging task for the technical difficulty of space‐variant range cell migration correction (RCMC). It is more complicated when considering the manoeuver of high‐speed platforms. The conventional Doppler domain RCMC method is with low performance and requires a large amount of zero‐padding. This Letter proposes a modified RCMC method which removes the space‐variant range cell migration (RCM) components by deramp‐keystone transform and then compensates the unified RCM terms in the time domain. Compared with the conventional method, the proposed one is with high performance and can avoid zero‐padding. This method is validated by the simulated SAR data