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A Review of Propagation and Scattering Factors in Remote-Sensing and Ship-Tracking by HF (High Frequency) Radar,
BIRMINGHAM UNIV (ENGLAND) DEPT OF ELECTRONIC AND ELECTRICAL ENGINEERING
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The propagation-loss, noise and scattering mechanisms involved in ground-wave radar for sea-state sensing and ship-tracking are first reviewed, taking as an example a coastal installation in the U.K. Techniques for extracting surface-current, surface-wind and directional sea-wave spectrum from first and second-order sea-echo are described, with reference to the influence of the antenna directivity and propagation factors. The special factors affecting ship-tracking in range, azimuth and Doppler are illustrated. The second part of the review concerns the use of sky-wave radar for sea-state sensing and for assessing the ionospheric layer configuration and propagation mode patterns. Sea-state sensing is shown to require real-time propagation assessment for effective frequency-management. Rapid sweep-frequency, sweep-azimuth and Doppler analysis are shown to be desirable. Author
APPROVED FOR PUBLIC RELEASE