TRACKING WITH RADAR A tracking-radar systems measures the coordinates of a target and provides data which may be used to determine the target path and to predict its future position. All or only part of the available radar data-rang, elevation angle, azimuth angle, and doppler frequency shift may be used in predicting future position: that is, a radar might track in range, in angle,in doppler,or with any combination.Almost any radar can be considered a tracking radar provided its output information is processed properly. But in general, it is the method by which angle tracking is accomplished that distinguishes what is normally considered a tracking radar from any other radar. It is also necessary to distinguish between a continuous tracking radar and a track-while-scan(T W S) radar. The former supplies continuous tracking data on a particular target, while the track-while-scan supplies sampled data one or more target.In general,the continuous tracking radar and the T W S radar employ different types of equipment.The antenna beam in the continuous tracking radar is positioned in angle by a servomechanism actuated by an error signal.The various methods for generating the error signal may be classified as sequential lobing conical scan,and simultaneous lobing or monopulse. The range and doppler frequency shift can also be continuously tracked,if desired,by a servo-control look actuated by an error signal generated in the radar receiver.The information available from a tracking radar may be presented on a cathode-ray-tube (C R T )display for action by an operator,or may be supplied to an automatic computer which determines the target path and calculates its probable future course.
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