Adaptive Radar Techniques. Volume II. Angle Tracking with an Adaptive Array.

摘要

The final report on an adaptive radar techniques study is contained in two volumes. The first volume contains the results of a computer study of adaptive receiving array antennas for radar. This Volume II describes a technique for angle tracking with adaptive array antennas. As in conventional monopulse systems,two receiving beams are formed: a sum beam (Sigma) and a difference beam (Delta). Each of these beams is formed with adaptively controlled weights which generate antenna patterns with nulls on sidelobe jammers. Since the array weights and antenna patterns vary with the external noise field distribution,the conventional angle estimator Sigma/Delta does not provide an accurate angle estimate. An expression for estimating target angle off boresight,based on the Sigma and Delta beam outputs and the adaptive weights,is derived in this report. Simulation results show that this angle estimation equation and the adaptive Sigma and Delta array outputs provide good angle tracking accuracy in jamming environments where conventional non-adpative monopulse tracking fails. (Author)