Ionospheric distortion mitigation techniques for over-the-horizon radar

Benjamin Root

doi:10.1117/12.406511

13 November 2000 Ionospheric distortion mitigation techniques for over-the-horizon radar

Benjamin Root

Proceedings Volume 4116, Advanced Signal Processing Algorithms, Architectures, and Implementations X; (2000) https://doi.org/10.1117/12.406511
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

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.

Citation Download Citation

Benjamin Root "Ionospheric distortion mitigation techniques for over-the-horizon radar", Proc. SPIE 4116, Advanced Signal Processing Algorithms, Architectures, and Implementations X, (13 November 2000); https://doi.org/10.1117/12.406511

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