PHASED-ARRAY IMAGING OF MOVING TARGETS WITH RANDOMIZED BEAM-STEERING AND AREA SPOTLIGHTING

This paper presents a system model and inversion for imaging moving ta rgets using phased arrays. The system model provides a mathematical fr amework to represent the motion of a moving target in the beam-steerin g domain which is identified as the slow-time domain. The inversion pr ovides a reconstruction of the moving targets in the spatial and veloc ity domains. It is shown that a randomized beam steering strategy in t he slow-time domain can improve the resolution in the velocity domain. The imaging problem is also formulated for a phased array system that spotlights a target area with its transmitted beam to improve the tar get to clutter power ratio, and obtains beam-steered data in the recei ve mode for high-resolution imaging.