Title :
Robust algorithm for combating look direction error problems
Author :
Ko, C.C. ; Liu, H.
Author_Institution :
Dept. of Electr. Eng., Nat. Univ. of Singapore, Singapore
fDate :
7/1/1995 12:00:00 AM
Abstract :
A simple and fast zero tracking algorithm for adaptive arrays with large look direction errors is presented and investigated. Basically, the algorithm is based on adjusting the complex zeroes of a power inversion array in a time-multiplexed manner to track all the sources in the environment. To preserve the desired signal which is supposed to be closest to the look direction of 0°, the algorithm removes the zero with the shortest distance to ej0 so that the directional response consists of only nulls steered at the jammers. When compared with the least mean square (LMS) algorithm employing zeroth and first-order look direction constraints, the new algorithm has about the same implementation complexity, is considerably faster, and possesses a much better signal-to-noise ratio (SNR) performance when the look direction is erroneous
Keywords :
array signal processing; computational complexity; interference suppression; least mean squares methods; time division multiplexing; adaptive arrays; complex zeroes; directional response; fast zero tracking algorithm; first-order look direction constraint; implementation complexity; large look direction errors; least mean square algorithm; look direction error problems; power inversion array; robust algorithm; signal-to-noise ratio performance; time-multiplex; zeroth order look direction constraint; Adaptive arrays; Convergence; Data preprocessing; Interference constraints; Jamming; Least squares approximation; Power generation; Robustness; Signal to noise ratio; Working environment noise;
Journal_Title :
Aerospace and Electronic Systems, IEEE Transactions on
