The Performance of Adaptive Array in a Dynamic Environment

The performance of adaptive arrays for jamming cancellation isdegraded due to relative angular movements between the arrayelements and the signal sources in space. We consider small angularvariations about the steady state of a linear (power inversion) arraycaused by either 1) a discrete angular jump, or 2) a continuousangular movement with constant angular velocity. Performancedegradation is assessed in terms of the resulting increase in the totaloutput power relative to its steady-state (minimum) value. Theresults reported are independent of the algorithm used to minimizethe output mean square error (MSE) and are supported bycomputer simulations.