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Proceedings Paper

Decimated Photodetector Array Geometry In Spectrum Analysis: Experimental Results
Author(s): David W. Graves; Ed Lantz
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Paper Abstract

Acousto-optic interferometric spectrum analysis performs coherent channelization and downconversion of a large number of channels within a wide frequency band. Each IF output requires a photodetector which is typically followed by a pre-amplifier, bandpass filter, and video logarithmic amplifier. Systems with 1000-2000 channels are exceedingly complex. This paper presents experimental results of an architecture which employs an additional Bragg cell to scan the spatial frequency plane across a decimated photodetector array, reducing the number of post detection circuits by effectively timesharing detector channels. The architecture is tested both as an interferometric-and cross-spectrum analyzer which facilitates angle of arrival measurement by preserving the phase difference between the two input signals.

Paper Details

Date Published: 22 August 1988
PDF: 8 pages
Proc. SPIE 0936, Advances in Optical Information Processing III, (22 August 1988); doi: 10.1117/12.946939
Show Author Affiliations
David W. Graves, Harris Corporation (United States)
Ed Lantz, Harris Corporation (United States)

Published in SPIE Proceedings Vol. 0936:
Advances in Optical Information Processing III
Dennis R. Pape, Editor(s)

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