ELECTRO-OPTICAL SIGNAL PROCESSING TECHNIQUES FOR PHASED ARRAY ANTENNAS.
Quarterly progress rept., 1 Oct-31 Dec 63,
COLUMBIA UNIV NEW YORK SCHOOL OF ENGINEERING AND APPLIED SCIENCE
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The research program leading to the development of a signal processor for phased array antennas utilizing the time delay and spatial multiplexing techniques is reviewed. A summary of the basic one-dimensional spectrum analyzer theory is presented. An electro-optical spectrum analyzer which is the major component of the phased array processor is described. An experimental model containing a single channel ultrasonic light modulator and a helium-neon gas laser light source is used to determine system performance. For a 15-mc and a 20-mc signal excitation, the theoretical resolution width of 20 kc was obtained indicating a diffraction limited optical system. Experimental measurements of the scattered light level are also presented indicating that a system dynamic range of 40 db is feasible. The signal simulator, transducer drivers, and the 24-channel light modulator designed for the experimental spatially multiplexed system are also described. Author