Abstract:

Displaced phase centers multiple azimuth beam (DPC-MAB) synthetic aperture radar (SAR) effectively improves the high resolution wide swath (HRWS) observation capability of space-borne SAR systems, but signal reconstruction performance will deteriorate with the departure of real pulse repetition frequency (PRF) from the optimal one required by uniform sampling. On the benefit of flexible beam forming capability of active phased array antennas, the uniform sampling could be achieved for arbitrary PRF by adaptively adjusting the distance between receiving antennas, thus system performances on signal reconstruction,azimuth ambiguity to signal ratio and signal to noise ratio etc. could be optimized. Depending on this kind of array configuration, a multiple-input multiple-output (MIMO) system is available as well to further expand system functions without any additional transmitting antenna.