ADAPTIVE BEAMFORMERS IN COMMUNICATIONS AND DIRECTION FINDING SYSTEMS
Richard P. Gooch, B.J. Sublett, R. Lonski · 2005
This paper elaborates on a technique described in (l) for simultaneously receiving and estimating the directions-of-arrival of multiple cochannel signals impinging on an array of sensors. The method described therein used a combination of adaptive CM Array beamformers anid signal cancellers to sequentially lock onto and re- move emitters one-by-one from the sensor signals. Inherent to the signal cancellation process was the generation of a direction vector associated with the signal being cancelled. In this paper, results of the above method applied to digitized snapshot data are presented. Unexpected performance degradations observed in these results are explained and two remedies proposed. One remedy involves the ad- dition of a parallel arrangement of CM Arrays whose weight wectors are initialized bawd on the cascaded array weight vectors and signal canceller vector:;. The other remedy involves the modification of the error signals used to adapt the signal cancellers