Multichannel optical time-integrating correlator for adaptive jamming cancellation

Michael C. Zari; Robert J. Berinato; Michael J. Ward; Harold Gregory Andrews II

doi:10.1117/12.139881

24 August 1992 Multichannel optical time-integrating correlator for adaptive jamming cancellation

Michael C. Zari, Robert J. Berinato, Michael J. Ward, Harold Gregory Andrews II

Proceedings Volume 1704, Advances in Optical Information Processing V; (1992) https://doi.org/10.1117/12.139881
Event: Aerospace Sensing, 1992, Orlando, FL, United States

Abstract

Hardware implementation of the steepest descent algorithm, as applied to multichannel adaptive jamming cancellation, requires the realtime correlation of wide bandwidth signals from multiple input channels. The described optical system uses a single-channel acousto-optic (AO) deflector as an input device for the adapted main antenna signal, where multiple jamming sources mask the target return, and a multichannel AO deflector as the input device for an array of auxiliary antennas, each receiving jamming energy. A time-integrating correlation between the main and auxiliary channels is calculated optically and produces an update to each weight function (stored in computer memory) in accordance with a steepest descent algorithm. The updated weight functions are optically reconstructed and used to tap a multichannel AO delay line, which carries the information from the array of auxiliary channels. A spatial sum of the output from the weighted delay line yields an estimate of the noise in the main channel. The multichannel optical time-integrating correlator has demonstrated realtime parallel computation of the correlation between two wide bandwidth auxiliary channels and the adapted main channel.

Citation Download Citation

Michael C. Zari, Robert J. Berinato, Michael J. Ward, and Harold Gregory Andrews II "Multichannel optical time-integrating correlator for adaptive jamming cancellation", Proc. SPIE 1704, Advances in Optical Information Processing V, (24 August 1992); https://doi.org/10.1117/12.139881

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