Steered response control of the generalized sidelobe canceller
Gerald L. Fudge, Darel A. Linebarger · 2002
This paper presents a new set of derivative constraints for the generalized sidelobe canceller (GSC) that can be used to reduce sensitivity to steering error. These constraints are designed to flatten the spatial null of the GSC blocking matrix so that for a small steering error, the desired signal is still blocked and the GSC does not experience signal cancellation. With this approach, the steered response of the GSC can be forced to locally approximate any realizable fixed-weight beampattern. A related set of constraints can be used with the eigenvector constraint calibrated GSC to control the steered response for use in the presence of array errors.