Multisensor tracking of re-entry vehicles

The paper outlines an error analysis technique for readily computing the effects of radar location on tracking accuracy and illustrates the technique with the tracking of reentry vehicles. Three tracking radars are used as would be for multisensor tracking. The tracking goal is to track the reentry vehicle for a short time and then to accurately predict its impact point. This impact point can then be used by the rest of the system to determine the degree of threat of the reentry vehicle to the area being defended by the radars. The sensors are three monostatic radars arranged in an equilateral triangle and capable of measuring only range to an accuracy standard deviation of 1.524 m. It is shown that the multiradar system requires only range measurements for precision track.