Abstract

In communication countermeasure, the parameter estimation of frequency-hopping (FH) signals has been widely investigated and applied in actual equipments. In this paper we propose a variable rate FH method that with excellent low probability of intercept (LPI) performance, which could break the rules of FH signal estimation effectively. This method based on Chaotic Sequences uses the nonlinear quantitative method to obtain plenty of strong stochastic hopping rates. Because of less complexity, it can be achieved by software radio, and also can be applied in current communication equipment to improve the communication countermeasure capability. SPWVD is an advanced FH signal parameter estimation which possesses good time frequency concentration and the ability of suppressing cross-terms. We adopt this method to estimate the parameters of FH signal. The simulation results are presented to evaluate the performance of the variable rate FH system. Comparisons between systems of fixed rate FH and variable rate FH are given in terms of the signal parameter performance.

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