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Proceedings Paper

Multigigahertz range-Doppler correlative processing in crystals
Author(s): Todd L. Harris; Wm. Randall Babbitt; Kristian D. Merkel; R. Krishna Mohan; Zachary Cole; Andy Olson
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Paper Abstract

Spectral-spatial holographic crystals have the unique ability to resolve fine spectral features (down to kilohertz) in an optical waveform over a broad bandwidth (over 10 gigahertz). This ability allows these crystals to record the spectral interference between spread spectrum waveforms that are temporally separated by up to several microseconds. Such crystals can be used for performing radar range-Doppler processing with fine temporal resolution. An added feature of these crystals is the long upper state lifetime of the absorbing rare earth ions, which allows the coherent integration of multiple recorded spectra, yielding integration gain and significant processing gain enhancement for selected code sets, as well as high resolution Doppler processing. Parallel processing of over 10,000 beams could be achieved with a crystal the size of a sugar cube. Spectral-spatial holographic processing and coherent integration of up to 2.5 Gigabit per second coded waveforms and of lengths up to 2047 bits has previously been reported. In this paper, we present the first demonstration of Doppler processing with these crystals. Doppler resolution down to a few hundred Hz for broadband radar signals can be achieved. The processing can be performed directly on signals modulated onto IF carriers (up to several gigahertz) without having to mix the signals down to baseband and without having to employ broadband analog to digital conversion.

Paper Details

Date Published: 17 June 2004
PDF: 12 pages
Proc. SPIE 5362, Advanced Optical and Quantum Memories and Computing, (17 June 2004); doi: 10.1117/12.542431
Show Author Affiliations
Todd L. Harris, Montana State Univ./Bozeman (United States)
Wm. Randall Babbitt, Montana State Univ./Bozeman (United States)
Kristian D. Merkel, Montana State Univ./Bozeman (United States)
R. Krishna Mohan, Montana State Univ./Bozeman (United States)
Zachary Cole, Montana State Univ./Bozeman (United States)
Andy Olson, Montana State Univ./Bozeman (United States)

Published in SPIE Proceedings Vol. 5362:
Advanced Optical and Quantum Memories and Computing
Hans J. Coufal; Zameer U. Hasan, Editor(s)

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