Optimised array antenna nulling with phaseonly control
Abstract
The pointing direction gain of a linear phased array antenna is maximized with the constraints of phaseonly control at the N antenna elements and the imposition of J nulls at angles theta(1), theta(2),..., theta(J) from the array normal. The specification of J nulling angles requires the a priori knowledge of the directions of the emitter sources. This maximization problem with constraints is reduced to 2J + 2 nonlinear equations, which can be solved via a vector Newton algorithm to yield the N complex antenna weights in terms of the 2J + 2 unknowns. Examples are given for a 20element array with uniform and Hamming amplitude weighting and the imposition of as many as five nulling angles. Examples of mainbeam nulling are also given.
 Publication:

IEE Proceedings F: Radar and Signal Processing
 Pub Date:
 June 1991
 Bibcode:
 1991IPRSP.138..241C
 Keywords:

 Antenna Arrays;
 Nonlinear Equations;
 Phase Control;
 Phased Arrays;
 Radar Antennas;
 Jacobi Matrix Method;
 Linear Arrays;
 Sidelobes;
 Communications and Radar