Abstract
This paper analyzes the instantaneous frequency (IF) estimation properties of S-Transform (ST) and proposes the reason of the poor estimation performance for ST at low frequencies. A Generalized S-Transform (GST) which has better performance than the ST at low frequencies is therefore introduced in the IF estimation. It is the first time applied in the phase contamination correction of Over-the-horizon-radar (OTHR) in this paper. The effectiveness of the GST has been studied by using the data of high frequency surface wave radar (HFSWR) with artificially added phase perturbations. Through the comparisons on the calculation complex and the effectiveness of contamination correction with the Pseudo Wigner-Ville Distribution (PWVD) method and the Modified Adaptive Short Time Fourier Transform (MASTFT) method in the referred literatures, the GST method used in this paper has much better performance.
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