Abstract:

In non-cooperative condition, it is of significance to estimate the parameters of frequency hopping signals accurately and rapidly for capturing the communication parameters of hostile part and generating track jamming. An intrinsic time-scale decomposition based algorithm for rapidly estimating a frequency hopping hop rate is proposed. In this algorithm the frequency hopping signal is iteratively decomposed into a series of proper rotation components and a new sequence is derived which is composed by the maxima from the instant amplitude envelop of each layer proper rotation component. The Fourier transform based analysis of the obtained sequence provides the estimation of the hop rate for a frequency hopping signal. This algorithm is low in computation complexity, unaffected by time-frequency uncertainty principle, high accuracy in time frequency plan. Simulation results show that this algorithm can estimate the frequency hop rate effectively.