Dynamic phase-locked loop bandwidth adjusting method for carrier extraction

A technology of loop bandwidth and dynamic adjustment, applied in the direction of automatic power control, electrical components, etc., can solve problems such as temporary loss of lock, phase slip loss, loss of accuracy, etc., to avoid invalid data, respond quickly, and reduce burden Effect

Active Publication Date: 2015-01-14
ZHEJIANG UNIV
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Problems solved by technology

(1) The focus of attention is only how to determine the optimal bandwidth in various environments, and there is no corresponding constraint in the switching process between different bandwidths, and there are risks such as phase loss or temporary loss of lock
(2) Due to the complex calculations, the update period of the loop bandwidth is long, usually every few milliseconds, which makes it unable to respond to some sudden dynamic processes in time, which will also cause phase slippage
But these i

Method used

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  • Dynamic phase-locked loop bandwidth adjusting method for carrier extraction
  • Dynamic phase-locked loop bandwidth adjusting method for carrier extraction
  • Dynamic phase-locked loop bandwidth adjusting method for carrier extraction

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[0032]like figure 1 As shown in the figure, a method for dynamic adjustment of loop bandwidth is based on the third-order digital phase-locked loop, adding a carrier-to-noise ratio detector, an independent phase difference integrator, an optimal loop parameter calculation module and a switching control module. .

[0033] The carrier-to-noise ratio detector is responsible for detecting the carrier-to-noise ratio of the input signal and provides the basis for the calculation of the optimal parameters. Real-time monitoring of the input signal carrier-to-noise ratio is necessary because it varies due to changes in the ionosphere. An independent phase difference integrator provides phase difference information for bandwidth adjustment as a monitoring quantity for dynamic processes. The optimal loop parameter calculation module calculates the current optimal loop parameters in real time according to carrier-to-noise ratio, crystal oscillator characteristics, mission objectives, et...

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Abstract

The invention discloses a dynamic phase-locked loop bandwidth adjusting method for carrier extraction. The bandwidth adjusting process can be divided into two stages, namely, the respond stage of switching from static bandwidth into dynamic bandwidth when the dynamic process is started and the recovery stage of switching the dynamic bandwidth back into the static bandwidth when the dynamic process is stopped. Compared with an FAB-PLL, the method has the advantages that no phase sliding locking failure happens in the adjusting process, the dynamic process response speed is high, the response speed is high, and the method has great application potential in the tasks where movement models such as rockets, missiles and low earth orbit satellites are complex and the environment time varying is obvious.

Description

technical field [0001] The invention relates to the field of wireless communication and measurement, in particular to a method for dynamically adjusting the bandwidth of a phase-locked loop for carrier extraction and tracking. Background technique [0002] Carrier extraction is one of the important technologies in the field of wireless communication and measurement. The tracking performance of the carrier is affected by various external factors that change with time, and there are optimal loop parameters under each external condition. In order to improve the tracking performance of the loop, various adaptive bandwidth adjustment methods have been proposed and widely used. Currently, commonly used adaptive bandwidth adjustment methods include FAB-PLL, PLB-PLL, and FL-PLL. [0003] Loop dynamic performance and loop tracking accuracy are the core issues in bandwidth adjustment. When a large bandwidth is used, the dynamic process can be better dealt with but the tracking accu...

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Application Information

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IPC IPC(8): H03L7/085H03L7/099H03L7/08
Inventor 张朝杰娄延年郭攀金仲和
Owner ZHEJIANG UNIV
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