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

Volume

31

Issue

3

fYear

1995

fDate

7/1/1995 12:00:00 AM

Firstpage

1043

Lastpage

1053

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 e^j0 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;

fLanguage

English

Journal_Title

Aerospace and Electronic Systems, IEEE Transactions on

Publisher

ieee

ISSN

0018-9251

Type

jour

DOI

10.1109/7.395237

Filename

395237