Patent Document ID: 5406290
Application ID: 08236337
Patent Flag: 1

Claim One:
1. Apparatus for assessing the effectiveness of an interception of a targeted incoming missile by a launched intercepting anti-missile, comprising: a dual mode radar system for detecting and tracking moving craft, said radar system having a tracking mode and an intercept mode for transmitting RF pulses at a high pulse repetition frequency during said intercept mode and a lesser pulse repetition frequency during said tracking mode; said radar system further including: antenna means for radiating said radar pulses into space, whereby said radar pulses may be incident upon one or more craft moving through such space; broad band receiver means for receiving radar echo pulses reflected from any such moving craft, said broad band receiver means having a band width at least as large as the bandwith of said RF pulses being transmitted during said intercept mode; controller means, said controller means including: range determining means, responsive to radar echo pulses received by said receiver, for determining the distance between the site of said radar transmitter and each craft detected; and collision prediction means, responsive to radar echo pulses received by said receiver, for determining the intercraft distance between any two such craft that are simultaneously detected and whether said intercraft distance is decreasing; and mode switching means for switching said transmitting means from said tracking mode into said intercept mode, responsive to said collision predicting means detecting an inter craft distance of less than a predetermined minimum distance; display means, coupled to said receiver means and said controller means, for displaying a sequence of A-scope presentation traces of the amplitude of radar echo signals reflected from two crafts while in close proximity and closing upon one another to a collision there between or avoidance of collision, during the period in which said transmitting means is in said intercept mode, to provide a trace representative of the length of at least one of said craft representing the targeted incoming missile and whereby an amplitude variation occuring in such trace represents the location on craft at which collision occured.