Three-dimensional photorefractive signal processing for radar applications

Robert T. Weverka; Kelvin H. Wagner; Anthony W. Sarto

doi:10.1117/12.212711

30 June 1995 Three-dimensional photorefractive signal processing for radar applications

Robert T. Weverka, Kelvin H. Wagner, Anthony W. Sarto

Proceedings Volume 2481, Photonic Device Engineering for Dual-Use Applications; (1995) https://doi.org/10.1117/12.212711
Event: SPIE's 1995 Symposium on OE/Aerospace Sensing and Dual Use Photonics, 1995, Orlando, FL, United States

Abstract

A photorefractive crystal can be used as a three-dimensionally parallel array of multipliers. In writing the photorefractive gratings, the crystal performs the operation of multiplying the inputs and integrating the resulting products. In readout the photorefractive crystal multiplies the inputs with the stored gratings. The three dimensional array of multipliers is only accessible from the two-dimensional faces. This restricts us to using the photorefractive crystal for outer- products in writing to the full three dimensions of parallelism and inner products in reading out the three dimensions, when we are using a single wavelength system. We have explored issues in using the full three dimensions of parallelism in the real time volume holograph for signal processing applications. These issues are illustrated with our successful implementation of a high-bandwidth large phased-array radar processing system. This example system leads to a new algorithm for processing phased-array-radar data, which has a great advantage in hardware complexity over the classic Widrow algorithm and leads to a significant hardware savings for true-time-delay phased-array-radar control systems.

Citation Download Citation

Robert T. Weverka, Kelvin H. Wagner, and Anthony W. Sarto "Three-dimensional photorefractive signal processing for radar applications", Proc. SPIE 2481, Photonic Device Engineering for Dual-Use Applications, (30 June 1995); https://doi.org/10.1117/12.212711

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