Adaptive beam-domain processing for space-based radar
Braham Himed - Air Force Research Laboratory
Tue, 27 April 2004, 10:20 AM - 12:00 PM
This paper discusses beam-domain space-time adaptive processing (STAP) algorithms for a low-earth-orbit (LEO) space-baced radar (SBR). The performance of subarray-based joint-domain-localized (JDL) algorithm is first examined for various processor parameters. Then, a combined beam-domain STAP algorithm approach that combines JDL with difference ( beams is presented. It is shown that the combined JDL- algorithms offer less system complexity and yield performance similar to that of JDL that uses higher degrees of freedom. It is also shown that the earth?s rotation induces a crab angle to the platform, which makes the clutter range-Doppler spectrum vary with range. Illustrative examples show that this crab angle severely degrades the signal-to-interference-plus-noise ratio (SINR), thereby reducing the minimum detectable velocity (MDV) of STAP systems.