1. A track detection system comprising; receiving means for receiving reflected radio frequency signals from an object in a given medium, range storage means operatively coupled to said receiving means for storing range, information therein between a minimum and maximum range, position indicating means operatively coupled to said receiving means for indicating the direction from which said radio freuqency signals are received, position storage means comprising shift register means operatively coupled to said position indicating means for storing information therein corresponding to receiving means position and sequentially shifting said information through said register with respect to time, coincidizing means operatively coupled to said range storage means and said position storage information and producing outputs therefrom when data corresponding to a particular range and a particular position of the receiving means are coincident therein, said coincidence means being operative to perform a cross-correlation with a class of possible tracks; counting means operatively coupled to said coincidizing means for counting a number of outputs from said coincidizing means and performing a decision as to the presence or absence of an object for each test track.
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