Abstract: A method for firing a computerized radar weapon system upon a fast target to reduce errors in aim caused by aim-biasing factors that vary in time and space includes computing a point along an extrapolated target track ahead of the target at which to stage an interception. A spotting round is fired at the point to zero-in just before the interception and then a correctly-aimed intercept round is fired at the point in time to make the interception. Additional interceptions may be staged at backup intercept points to guard against a miss, a burst of spotting rounds may be fired at an intercept point to average out perturbations in the trajectory of the projectile from each one of the rounds, and conventional monopulse radar methods of aim bias measurement may be employed to detect projectile miss information.

Abstract: A radar system with a main antenna that is rotatably supported to permit use in searching about a search axis includes an auxiliary antenna that is rotatably supported to permit use in complementing main antenna coverage. Rotational components and control circuitry are provided, both for simultaneously rotating the antennae with the auxiliary antenna poised in position relative to the main antenna to stop and face a direction just searched, and for separately stopping the auxiliary antenna in position to face a selected direction as rotation of the main antenna continues. One embodiment includes a coaxially-masted antenna support having a pair of coaxial masts mounted on a common support structure, one mast being rotatably mounted to support the main antenna and the other mast being fixed. A carriage is rotatably mounted on the coaxial masts to support the auxiliary antenna.