INSTRUMENT SCIENCE REPORT #023
	
Mode 2 Target Aquisition: Binary Search Parameters, Oct 1985
	A.L. Kinney and H.0. Ford 
        DATE: October 1985

ABSTRACT


Introduction:



The idea of binary search target aquisition is to identify a given
target in the 43 x 43 aperture, calculate a centroid in the direction
using the diode array (z), and place it on the edge of the diode
array to uccurately determine its y position. The target is
identified by specifying the range of counts that stars in the field
are expected to bave, and then specifying which star, in order of
brightness, is the target. The target is driven to the edge of the
diode array, the position of the star is found, and a slew request to
place the target in the center of the aperture is made to the
telescope.