Algorithms for mitigating terrain-scattered interference

This paper summarizes work carried out during the past few years on terrain-scattered interference (TSI) mitigation, including joint TSI mitigation and monostatic clutter nulling. We begin with an overview of TSI phenomenology to motivate the analysis. Two mitigation approaches are considered. In the first, a cascade of 2-D space-time adaptive processing (STAP) algorithms is used first to mitigate TSI in space and fast-time (or range sample) and then to null monostatic clutter using a post-Doppler algorithm in space and slow-time (or pulse number). In the second approach, a joint 3-D pre-Doppler STAP algorithm is used to null the clutter and TSI simultaneously. Performance results are shown for a representative system simulation to illustrate the tradeoffs inherent in designing a mitigation approach