Maneuvering target signal processing algorithm based on improved S-Method for HF OTH radar

Core steps of S-method based maneuvering target signal processing for HF (high frequency) OTH(over-the-horizon) radar include the calculation of S-method distribution from signal´s STFT (short time Fourier transform) and S-method distribution based signal decomposition. However, as one of the main parameters of the whole signal processing algorithm, the window function of STFT has a great influence on the results of the signal processing, and this lead to the reducing performance of the algorithm. In this paper, we analyse theoretically the window function´s influence on the algorithm for the first time, on the basis of which we propose improved S-method that meets the principle of optimal signal processing, and consequently obtain a maneuvering multi-target signal processing algorithm based on improved S-method. Eventually, simulation and performance analysis are shown in order to verify the validity and advantage of improved algorithm.