22 August 1988 Decimated Photodetector Array Geometry In Spectrum Analysis: Experimental Results
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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.
© (1988) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David W. Graves, David W. Graves, Ed Lantz, Ed Lantz, } "Decimated Photodetector Array Geometry In Spectrum Analysis: Experimental Results", Proc. SPIE 0936, Advances in Optical Information Processing III, (22 August 1988); doi: 10.1117/12.946939; https://doi.org/10.1117/12.946939
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