Joint domain localized adaptive processing using nonorthogonal steering vectors

The joint domain localized (JDL) processing adaptive algorithm significantl y speeds up space-time adaptive processing by working within a localized pr ocessing region in the angle-Doppler domain. The two-dimensional data colle cted in space and time domains are transformed to the angle-Doppler domain using the spatial and temporal steering vectors. However, the algorithm dep ends on the assumption that the steering vectors form an orthogonal set. In practice, due to the mutual coupling between antenna elements, the spatial steering vectors are nonorthogonal. This paper presents a modification of the JDL algorithm to account for the nonorthogonality of the spatial steeri ng vectors. The modification is extended to allow for the use of windows in transforming from the space-time to the angle-Doppler domain. Improvements in detection capability are demonstrated using examples from the MCARM dat abase. (C) 1999 Academic Press.