A Note on Some Concepts for Using the LMSC 'Barber Pole' Optical Correlator for Multichannel Sonar Signal Processing,
LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CALIF ELECTRONIC SCIENCES LAB
Pagination or Media Count:
The purpose of this note is to present a conceptual approach for using the LMSC Barber Pole optical correlator to simultaneously process multichannel signals from large acoustic arrays. The principal of operation of the LMSC Barber Pole correlator, the description of the experimental model, and the description of test results are reported in reference 1. Briefly, the LMSC optical correlator is a non-coherent-optical correlation detector of the stored reference type. This correlator performs real time correlation of received signals with the stored reference without a priori knowledge of the signal delays. The use of real time integration in the correlation operation avoids the problems of recording received signals on film prior to correlation with the reference. The first experimental model achieved a processing gain of 20 db for a reference record that was theoretically capable of providing a processing gain of 23 db. A substantial increase in processing gain can undoubtedly be obtained by using more densely recorded reference records and by further refining the correlator. Consideration is given here to the conceptual design of a sonar signal processing unit based on the principle of the LMSC correlator. The conceptual design is intended to be compatible with the requirements of both active and passive sonar signal processing.
- Electrical and Electronic Equipment
- Acoustic Detection and Detectors