1983 Volume 67 Issue 2 Pages 100-105
The optical target-coordinator is the important element in automatic infrared tracking systems for moving target. In this paper, we propose a method for optical-coordinator which is possible to determine the coordinates of the target with its surrounding background noise. This system has two kinds of optical modulating discs aligned with cascade on co-optical-axis and rotated in one direction with different velocity.
One of them is an involute reticle reported previouslly by the authors, which has excellent characteristics for suppression of background noise. And the other is used for determination of the target location, named “coordinate reticle” here.
Usually, the problem in such a double reticle system is a false signal causd by projection from the front reticle to the rear ond. This is, however, avoidable by means of separating each main path-band of spatial transfer function of two reticles. Validity of this approch is proved theoretically and experimentally. And effectiveness for the coordinator is confirmed through some experimental results.