A method capable of effectively tracking Doppler rate-of-change signals with extremely low signal-to-noise ratio
A technology of frequency change rate and signal-to-noise ratio, applied in the direction of automatic power control, electrical components, etc., can solve problems such as inability to track effectively, low signal-to-noise ratio, etc.
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[0014] refer to figure 1 . In the mathematical model of the digital phase-locked loop, the ultra-narrowband carrier loop filter transformation function is: F(z)=G 1 +G 2 / (1-z -1 )+G 3 / (1-z -1 ) 2 , where G 1 =rd / T,G 2 =rd 2 / T,G 3 =krd 3 / T; and d=4BT(r-k) / r(r-k+1), r=4ξ; where B is the loop bandwidth, T is the loop filter operation cycle, ξ is the loop damping coefficient, and k is the third order Loop gain coefficient, the typical value of the third-order loop gain coefficient k is 1 / 4~1 / 2. to G 1 , G 2 , G 3 Subtract the phase detector gain k d and digitally controlled oscillator DCO to adjust the sensitivity k c After that, the actual factor g of the loop filter can be obtained 1 , g 2 , g 3 . Phase detector gain k d Equal to the digital amplitude of the input signal, the adjustment sensitivity of the DCO k c =2πf s / 2 n , n is the output digit of DDS phase accumulator, f s is the sampling frequency of the system.
[0015] refer to figure 2 . ...
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