An adaptive interference canceling array utilizing hybrid techniques
Abstract
A description is given of the steady state properties of an adaptive array that makes use of prior knowledge of both the approximate signal arrival direction and the signal characteristics. The features of a directionally constrained array are combined with an array with a self-generated reference signal in the method. Explicit results for output signal, interference, and noise powers are obtained on the assumption that a single interferer is present. It is shown that the inclusion of a self-generated reference circuit reduces the sensitivity to pointing error that is typical of arrays using a zero order directional constraint; the improvement, it is noted, is a consequence of the reduction of the desired signal component fed back to the sidelobe canceling circuit. In addition, a relationship between the degree of sensitivity reduction and the quality of the reference signal is developed. Computational results are presented of signal to interference plus noise ratios for a 7-element 10-wavelength nonuniformly spaced array as a function of pointing error.
- Publication:
-
IEEE Transactions on Aerospace Electronic Systems
- Pub Date:
- November 1983
- DOI:
- 10.1109/TAES.1983.309391
- Bibcode:
- 1983ITAES..19..795H
- Keywords:
-
- Adaptive Control;
- Antenna Arrays;
- Antenna Design;
- Electromagnetic Interference;
- Noise Reduction;
- Sidelobe Reduction;
- Error Analysis;
- Hybrid Circuits;
- Sensitivity;
- Signal To Noise Ratios;
- Steady State;
- Communications and Radar