Abstract
A new method of estimating doppler spectra from HF ocean radar backscatter has been developed to obtain higher signal-to-noise ratio in doppler spectra. This method uses a linear filter technique to remove a noise in ocean radar data and multivariate auto-regression model to estimate highly accurate spectra using the minimum AIC method. The Doppler spectrum estimated using the linear filter technique includes the squared coherency of real and imaginary parts of the complex Fourier coefficients of ocean radar backscatter. This method is applied to in-situ observation data and compared with the doppler spectra estimated by existing method using the FFT spectral amalysis.The method can produce highly accurate estimates with higher SN ratio in Doppler spectra than those by other method.
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