A MORE FLEXIBLE OPTICAL CORRELATOR USING ELECTRO-OPTICAL DOPPLER REPLICAS.
ROME AIR DEVELOPMENT CENTER GRIFFISS AFB N Y
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The report presents the results of a theoretical investigation of optical signal processing techniques and describes a correlation technique for the processing of radar signals by means of electro-optical devices arranged in tandem. The electro-optical correlator described represents a modification to the correlators presently used in radars. The two-dimensional range and doppler correlation scheme eliminates the film processing by utilizing a second light modulator. A modification in the ultrasonic light modulator configuration is accomplished which enables it to be used as an electro-optical doppler replica. The two-dimensional optical correlator is a significant breakthrough in the field of radar signal processing because of its decided advantage over its electronic counterpart. The optical correlator is capable of simultaneously resolving multiple targets in both range and doppler, whereas its electronic counterpart requires a complexity of electronics for comparable performance in only one dimension. The modification of the electro-optical light modulator for use as a completely flexible doppler mask, adds a new dimension of flexibility to a device heretofore dependent upon photographic masks. Limitations of optical filtering and doppler mask configuration are presented, as well as the associated electronics. Author
- Electrical and Electronic Equipment