Abstract

A method for determining the velocity vector of coherently illuminated point retroreflectors moving with velocity ${\overline{v}}_s$ in the focal region of the collecting lens of an optical heterodyne receiver from the doppler spectrum is examined. Information relating to the magnitude and direction of ${\overline{v}}_s$ is shown to be obtainable by introducing a rotating mask in the signal or detector arm of the heterodyne receiver. The significance of the configuration examined as a model for widely dispersed multielement doppler radar systems is briefly discussed.

© 1971 Optical Society of America

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