Accession Number : AD0871751

Title :   Target Interference Effects on Optical Radar.

Descriptive Note : Technical rept.,

Corporate Author : ARMY MISSILE RESEARCH DEVELOPMENT AND ENGINEERING LAB REDSTONE ARSENAL AL PHY SICAL SCIENCES DIRECTORATE

Personal Author(s) : Emmons, G. A. ; Otto, W. F.

Report Date : 18 MAY 1970

Pagination or Media Count : 26

Abstract : The report presents considerations of the effects of diffusely reflected signals on the performance of optical radars. If the rotation rate of a target is determined, an approximate measurement of its length, transverse to its direction of rotation, can be made. This can be accomplished by relating either the spatial autocorrelation function of the signal or the bandwidth of the Doppler shifted signal to the geometry. Some measure of target surface character can be obtained by determining the depolarization of the reflected signal. The random phase variations in the reflected signal confuse the Doppler velocity readout and decrease the velocity resolution. Hence, target patterns impose limitations on the accuracy of velocity measurements. The effect of target patterns on the probability of detection has been considered from the view of minimizing average power requirements. It was found that for minimum average power the signal should be divided into n pulses where n is a function of the probability of detection. (author)

Descriptors :   (*OPTICAL RADAR, DETECTION), ELECTROMAGNETIC WAVE REFLECTIONS, TARGETS, DIFFRACTION, SIGNALS, DOPPLER EFFECT, STATISTICAL FUNCTIONS, POLARIZATION.

Subject Categories : Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE