High-precision pilot frequency digital phase-locked loop system based on fuzzy region pulse detection

Abstract

The invention provides a high-precision pilot frequency digital phase-locked loop system based on fuzzy region pulse detection. The high-precision pilot frequency digital phase-locked loop system comprises a frequency scale module, a DDS module, a signal pulse conversion module, a pilot frequency group phase coincidence point pulse module, a phase difference measuring and processing module, a voltage-controlled crystal oscillator module, a display module and a power supply module. Compared with an existing high-precision phase-locked loop, a phase discriminator is not needed, a fuzzy region pulse detection method is adopted, the resolution of phase difference measurement is greatly improved, the resolution of phase difference measurement at any moment is better than 1 ps, the synchronization precision of the phase-locked loop is greatly improved, the system structure is integrated through the FPGA technology, the development cost is reduced, the phase noise is suppressed, and the stability and reliability of the system are enhanced.

Description

technical field [0001] The invention relates to the technical field of phase-locked loops, in particular to a high-precision inter-frequency digital phase-locked loop system based on fuzzy area pulse detection. Background technique [0002] Phase-locked loop is a phase-synchronized control system, which is widely used in electronic communication, automatic control and automatic measurement and detection. The traditional phase-locked loop is built on the basis of the same frequency and phase detection. The locked signal must undergo frequency normalization processing to complete the phase comparison with the frequency standard signal. The frequency normalization processing requires complex frequency processing. During the transformation process, it is easy to introduce additional noise of the transformation circuit, which makes it difficult to guarantee the synchronization accuracy of the phase-locked loop. The phase-locked loop based on inter-frequency phase discrimination ...

AI Technical Summary

Problems solved by technology

The traditional phase-locked loop is based on the same-frequency phase detection. The locked signal must undergo frequency normalization processing to complete the phase comparison with the frequency standard signal. The frequency normalization processing requires complex frequency During the conversion process, it is easy to introduce additional noise from the conversion circuit, which ultimately makes it difficult to guarantee the synchronization accuracy of the phase-locked loop.

The phase-locked loop based on different frequency phase detection is based on the stable frequency relationship between the frequency standard signal and the locked signal. When there is a deviation, the phase difference signal output by the pulse phase detection does not show regular changes, which eventually makes the stability and reliability of the phase-locked system worse

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