Bi-adaptive scan digital universal sensor target tracker

Claim 1

In a passive electro-optical bi-adaptive scan target tracker having two concentric scan boundries for tracking targets of different sizes, small objects which become large due to range closure, and small objects which have escaped the inner boundry, the combination comprising: an electro optical sensing means having four circularly scanning detectors capable of scanning an area of concern with overlapping boundries, scan control means coupled to said sensing means for controlling the pattern of scan to generate an inner tracking area only where all scans overlap and an outer area comprised of the nonoverlapping areas, logic matrix means having first and second inputs and having multiple outputs, video processing circuit means coupled to said electro-optical sensing means and to said first inputs of said logic matrix for generating an output video signal whenever an object appears in the scan area pertaining to that particular video processing circuit, a counter decoder coupled to said scan control means and to said second inputs of said logic matrix for generating scan derived timing signals, said logic matrix being responsive to said input video signals and said scan derived timing signals for generating an output error signal according to the location of the target within the area being scanned by said sensing means.