Feedforward/feedback combined type carrier wave tracking method of cluster link
A carrier tracking and combined technology, applied in the fields of aviation data link and radio navigation
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[0110] The invention relates to a method for carrier tracking and parameter estimation of cluster link burst frequency spread signals, which can realize the whole system structure and algorithm on the digital signal processor DSP and FPGA of the circuit board.
[0111] 1. Feedforward / feedback carrier tracking control method
[0112] The present invention proposes a brand new carrier tracking method: feedforward+feedback carrier tracking control strategy. The open-loop feedforward control link of this method estimates carrier phase and Doppler frequency tracking residuals based on statistical filtering algorithm, and iteratively integrates and accumulates the current (kth step) carrier tracking residual estimation value to obtain the next step (k+1st step) ) Doppler frequency value forecast output to obtain high dynamic and global linear characteristics; the closed-loop feedback control link is a third-order Costas PLL, and the carrier phase and frequency tracking residual esti...
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