Cramer-Rao limit of SNCK signal parameter estimation and a fast central frequency estimation method

摘要

A kind of parameter estimation method of sine non-linear chirp keying (SNCK) is researched in this paper. Using the maximum likelihood method to estimate Cramer-Rao limit of SNCK signal, and the feature of Fourier domain of modulated SNCK signal, a fast center frequency estimation method which is suitable for small time-bandwidth product of SNCK signal is given. The simulation shows that the proposed algorithm to estimate the center frequency suits for value of small D SNCK signal, and the estimation performance is gradually approaching the maximum likelihood estimation of the Cramer-Rao limit.