Improvement of continuous-wave radar measurements in a partially controlled environment

A spatial filtering method is introduced for improving continuous-wave inverse synthetic aperture radar (ISAR) measurements in a partially controlled chamber. Twodimensional angle of arrival (AoA) estimation using a modified matrix pencil algorithm first identifies directions of interference sources outside the target zone. Then, each radar sweep is prefiltered to eliminate strong sources of chamber reflections without using radar absorbing materials. The system repeatabilty is also analyzed using a student T-test and results of before and after ISAR imagery are presented.