Abstract: A vehicle mounted radar tracking system monitors vehicle heading rate, vehicle heading acceleration, vehicle roll rate and vehicle pitch rate, and provides a turn detect signal in response to heading rate, heading acceleration, roll rate or pitch rate being in excess of corresponding enable threshold magnitudes. In response to the turn detect signal, the tracking system dead reckons the positions of targets being tacked, and tracking system parameters are varied to make it more responsive to target motion. The turn detect signal is removed in response to heading rate, heading acceleration, roll rate and pitch rate being less than corresponding disable threshold magnitudes, and the tracking system is returned to normal operation.

Abstract: A vehicle mounted radar system has an antenna (12) which rotates about a reference axis (19). During angular movement of the antenna with respect to the reference axis, a radar indicated target azimuth (.phi.') is modified to provide a corrected target azimuth (.phi.) which is substantially indicative of the actual or true target azimuth. A tracking system (25) uses a predicted radar indicated target position (P.sub.n+1 (x,y)) for target tracking and correlation. The tracking system uses a smoothed target position (STP(x,y)), indicative of actual target position, for providing a visual display (39) of target track.