21 January 1985 Acousto-Optic Processors For Passive Surveillance
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Proceedings Volume 0519, Analog Optical Processing and Computing; (1985); doi: 10.1117/12.945196
Event: 1984 Cambridge Symposium, 1984, Cambridge, United States
Abstract
A compact acousto-optic time integrating correlator has been developed for passive surveillance applications. The correlator has a bandwidth of 100 MHz about a center frequency (IF) of 300 MHz to provide time-difference-of-arrival information with a resolution of less than 10 nsec useful in locating wideband radar jammers when signals are received at two widely separated antennas. On an airborne platform, the correlator may perform passive ranging. This correlator features the use of counterpropagating surface acoustic waves on a single lithium niobate delay line interacting with light from a laser diode. Diffracted beams are interferometrically combined on an integrating photodiode array. Integration time of 1 msec provides a time-bandwidth product of 105. A two dimensional correlator allows processing of both time-difference-of-arrival and differential Doppler, and a related processor performs both cross correlation and cross spectrum analysis.
© (1985) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Irwin J. Abramovitz, "Acousto-Optic Processors For Passive Surveillance", Proc. SPIE 0519, Analog Optical Processing and Computing, (21 January 1985); doi: 10.1117/12.945196; https://doi.org/10.1117/12.945196
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KEYWORDS
Optical correlators

Acousto-optics

Diffraction

Signal processing

Carbon monoxide

Gas lasers

Adaptive optics

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