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.