An Omega-K algorithm for SAR bistatic systems

Abstract

Bistatic SAR uses separate flying transmitter and receiver platforms. There are two principal configurations : spatial invariant case, in which velocity vectors are equal; and spatial variant case, in which velocity vectors are not equal. ONERA and DLR performed experimental flights on the spatial invariant case in february 2003 [1]. The experiment was conducted using the X-band front ends that are compatible in terms of frequency (on a 100 MHz-Wide band). Estimation and compensation of the phase drift between the transmitter and the receiver master oscillator was presented in [1]. Until now, data have been processed with a back projection algorithm. This article investigates an Omega-K algorithm - or Range Migration Algorithm - for bistatic SAR systems in spatial invariant cases. First results of this algorithm on real data are included.