Abstract
The present paper investigates the influence of the real aperture radar (RAR) modulation on the imaging of range travelling waves by synthetic aperture radar (SAR). The study is based on a data set of range travelling wave events that consists of Envisat-ASAR single-look complex imagettes collocated with directional wave spectra from the WAM model. SAR image cross-spectra are simulated from the WAM data using various SAR imaging models and then compared to the crossspectra computed from the actual SAR data. We consider RAR modulation transfer functions (MTF) derived from both Bragg theory and the CMOD5 empirical radar cross-section model. In addition, both linear and nonlinear RAR modulations are applied.
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