Target coordinates are measured with a continuously scanning eiectro-optical system. Azimuth and elevation angles are measured passively using the 0.5-to-1.1-11 portion of the spectrum, and range is measured actively with a pulsed array of gallium arsenide laser diodes. Coordinates of several targets can be measured simultaneously 0 0 if they are in the 360 x 30 field of view.
Herman E. Brown,
James D. Cope,
R. A. Bond,
A. C. Cobb,
"Description of a Range, Azimuth and Elevation Detector of Optical Targets," Optical Engineering 6(4), 604117 (1 May 1968). https://doi.org/10.1117/12.7971385