Time delay and Doppler shift joint estimation method based on generalized Sigmoid conversion cyclic fuzzy function
A technology of Doppler frequency shift and fuzzy function, which is applied in the field of joint estimation of time delay and Doppler frequency shift, which can solve the problems of algorithm performance degradation, affecting method estimation effect, noise and so on.
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[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The overall algorithm flow chart is as follows figure 1 Shown:
[0022] The first step is to calculate the generalized Sigmoid transform circular fuzzy function;
[0023] 1.1 Use the adjustable sigmoid transform cyclic autocorrelation formula to calculate the adjustable sigmoid transform cyclic autocorrelation of the reference signal x(t) in the time interval [-T / 2, T / 2] As shown in formula (1):
[0024] R x , T S ϵ ( τ ) = Δ lim T ...
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