Measurement of High and Low Waves Using Dual-Frequency Broad-Beam HF Radar

Waveheight measurements with high-frequency radar have been troubled by the limitation dependent upon radio frequency for decades. It is suggested that high frequencies are needed for measuring low waves, whereas low frequencies are suitable for high waves. In this letter, a new waveheight inversion method using dual frequency is presented. Measurements of the two frequencies are fused together, according to their Doppler spectrum properties, to improve the range and accuracy of waveheight estimation. Experimental results collected on the coast of the Taiwan Strait over 18 days are shown to prove the validity of the method.