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Proceedings Paper

Ionospheric distortion mitigation techniques for over-the-horizon radar
Author(s): Benjamin Root
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Paper Abstract

High-Frequency radar detects targets at thousands of kilometers over the horizon by refracting its beam from the ionosphere. A disturbed ionosphere may distort the signal severely, especially in auroral and equatorial regions. The powerful ground clutter spreads in doppler and masks targets. This distortion is sometimes assumed to take the form of a random complex time-varying distortion function multiplying the time-domain signal. Simple and effective techniques have been developed to mitigate this distortion provided that either the amplitude or the phase of the distortion predominates. The general case of severe amplitude and phase distortion is much more difficult. The techniques are highly model- dependent but are sometimes reasonable for HF radar signals. An emphasis is placed on making the algorithms efficient, so that they can run in real time and keep up with the flood of radar data. The distortion model is first analyzed by phase-screen concepts that model the physics of the electromagnetic propagation through the turbulent ionosphere. To date the techniques have been tested on simulations, since the I/Q data collected thus far do not exhibit the kind of distortions for which these techniques are applicable.

Paper Details

Date Published: 13 November 2000
PDF: 10 pages
Proc. SPIE 4116, Advanced Signal Processing Algorithms, Architectures, and Implementations X, (13 November 2000); doi: 10.1117/12.406511
Show Author Affiliations
Benjamin Root, Naval Research Lab. (United States)


Published in SPIE Proceedings Vol. 4116:
Advanced Signal Processing Algorithms, Architectures, and Implementations X
Franklin T. Luk, Editor(s)

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