Costas ring using pilot frequency self-adaptive sensitivity

By introducing a complex mixer and a signal-to-noise ratio adaptive phase detector into the Costas ring and eliminating the low-pass filter, effective carrier synchronization under high dynamic frequency offset and low signal-to-noise ratio conditions is achieved, improving the system's real-time performance and noise immunity.

CN121261701APending Publication Date: 2026-01-02XIDIAN UNIV
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Patent Information

Application Number
CN202511365353.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-23
Publication Date
2026-01-02

AI Technical Summary

Technical Problem

Existing Costas rings struggle to achieve effective carrier synchronization under conditions of high dynamic frequency offset and low signal-to-noise ratio, failing to simultaneously meet the synchronization performance requirements under these conditions.

Method used

By introducing a complex mixer, designing a phase detector and a loop filter, adopting signal-to-noise ratio adaptive sensitivity, eliminating two low-pass filters, and utilizing pilot adaptive adjustment of loop bandwidth and output error jitter, the signal-to-noise ratio sensing capability is enhanced.

Benefits of technology

This improves the dynamic characteristics and noise immunity of the Costas ring for carrier tracking, reduces signal processing delay, and enhances system real-time performance and tracking accuracy at low signal-to-noise ratios.

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Abstract

A Costas ring utilizing pilot frequency self-adaptive sensitivity comprises a frequency mixer which carries out frequency mixing processing on an input base band to obtain an in-phase component and an orthogonal component; the phase discriminator is used for calculating the in-phase component and the quadrature component, generating a phase error and providing the phase error to the loop filter; the loop filter is used for carrying out filtering and frequency phase calculation on the phase error so as to control the phase increment of the numerical control oscillator; the numerically-controlled oscillator generates local carriers according to the phase increment and sends the local carriers to the mixer; the combiner is used for combining the in-phase component and the orthogonal component into an output base band, and the output base band is the final output of the Costas ring; the correlator is used for calculating the cross-correlation between the output baseband and the local pilot frequency, and sending the calculated cross-correlation to the power estimator; the delayer is used for providing delay of a pilot symbol length and carrying out symbol alignment before an output baseband and a local pilot are input into the power estimator; a power estimator that estimates and outputs a signal-to-noise ratio based on the cross-correlation; according to the method, the dynamic characteristic and the anti-noise capability of the Costas ring on carrier tracking are improved.
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