Processing Technique of HF Radar Signals for the Disaster Warning and Tsunami Detection

High-frequency (HF) surface wave radars provide a unique capability to detect targets far beyond the conventional microwave radar coverage. This capability also could contribute to the development and improvement of Tsunami Early Warning Systems. This paper presents the system design and introduces the key signal processing methodologies that enable the HF radar to provide early warning of the tsunami and oceanic disasters. The monitoring system is HF radar which works on the ground propagation of the vertically polarized radio waves in the frequency band of 4MHz to 25MHz. The modern HF radars are portable and use a three-element co-located receive antenna with advanced signal processing algorithm for the bearing estimation of the target. The range Doppler analysis is done by a complex signal processing algorithm. The paper explains the signal processing method and presents some of the representative pictures to illustrate the approach Keywords—Tsunami Warning, Ground wave HF Radar, Disaster warning using HF radars, Sea state monitoring radars, Pulsed FMCW radar, Double FFT processing form FMCW radars.