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• W11210842 abstract "High-frequency (HF) radars based on ground-wave propagation are used for remotely sensing ocean surface currents and gravity waves. For some 20 years a number of sytems have been developed taking advantage of improved electronics and computer techniques. However, the performance of these systems are limited by physical constraints, which are due to HF wave propagation and scattering as well as to the technical design of the measuring system. Attenuation of the HF ground-wave is strongly dependent on the radio frequency and sea-water conductivity. Experimental data conrm the predicted decrease of propagation range with decreasing conductivity. HF radar systems use dieren t methods of spatial resolution both in range and azimuth. Range resolution by means of short pulses and frequency-modulated chirps is compared, as well as azimuthal resolution by means of beam forming and direction nding (phase comparison). The emphasis is placed on recent developments." @default.
• W11210842 created "2016-06-24" @default.
• W11210842 creator A5003306093 @default.
• W11210842 creator A5045972347 @default.
• W11210842 date "2000-01-01" @default.
• W11210842 modified "2023-10-01" @default.
• W11210842 title "HF radars: Physical limitations and recent developments" @default.
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