ROBUST ALGORITHM FOR COMBATING LOOK DIRECTION ERROR PROBLEMS

A simple and fast zero tracking algorithm for adaptive arrays with lar ge lock direction errors is presented and investigated. Basically, the algorithm is based on adjusting the complex zeroes of a power inversi on array in a time-multiplexed manner to track all the sources in the environment. To preserve the desired signal which is supposed to be cl osest to the look direction of 0 degrees, the algorithm removes the ze ro with the shortest distance to e(j0) so that the directional respons e consists of only nulls steered at the jammers. When compared with th e least mean square (LIMS) algorithm employing zeroth and first-order look direction constraints, the new algorithm has about the same imple mentation complexity, is considerably faster, and possesses a much bet ter signal-to-noise ratio (SNR) performance when the look direction is erroneous.