Using information on tangential target motion in space-time signal processing

The description of a space-time signal scattered by a moving point target was considered. An idea of the potential for resolving moving targets, as well as the limits for improving the accuracy of measuring coordinates and velocities in active ranging against a background of set noise was given. Previous research has shown that the tangential (angular) displacement of a target relative to the reception antenna rotates the phase front and produces linear frequency modulation of the wave scattered by the target. The contribution of each of these factors to the potential capabilities of target resolution with respect to tangential (angular) velocity for various ratios between reception antenna size and target range was considered. An estimate is made of the limiting accuracy of measuring tangential (angular) velocity of a target in active ranging against a background of equipment noise. Based on the earlier space-time description of signals in radar systems with synthesized apertures, the contribution of the physical aperture to angular resolution and to the potential capabilities of measuring the angular coordinate of a target against interference were determined.