Dr. Todd L. Harris Profile

Dr. Todd L. Harris

Principal Scientist at Triple Ring Technologies, Inc.

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Proceedings Article | 17 June 2004 Paper

Multigigahertz range-Doppler correlative processing in crystals

Todd Harris, Wm. Babbitt, Kristian Merkel, R. Krishna Mohan, Zachary Cole, Andy Olson

Proceedings Volume 5362, (2004) https://doi.org/10.1117/12.542431

KEYWORDS: Doppler effect, Signal processing, Radar, Crystals, Modulation, Radar signal processing, Holography, Analog electronics, Digital signal processing, Signal generators

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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.

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