High-precision time-frequency reference source of navigation enhancement system

Abstract

The invention provides a high-precision time-frequency reference source of a navigation enhancement system, which comprises a reference generation unit with a frequency correction function and used for generating a common reference signal, a shunt electrically connected with the reference generation unit, a first reference phase-locked unit electrically connected with the shunt and used for generating a time-frequency reference of a transmitting unit, a second reference phase-locked unit used for generating a time-frequency reference of the receiving unit, and a power supply electrically connected with the reference generating unit, the shunt, the first reference phase-locked unit and the second reference phase-locked unit. In order to solve the problems of high precision, high stability,high reliability and the like required by engineering design of a time-frequency reference source, a scheme of digital phase locking and direct frequency synthesis is adopted, and a high-precision andhigh-accuracy common reference source is provided for a system by performing DDS adjustment in an adjustment reference generation unit on the frequency. The frequency correction parameter is updatedto the DDS in the time-frequency reference source through the control interface so as to ensure the precision index of the frequency source.

Description

technical field [0001] The invention relates to the field of telecommunication technology, in particular to a high-precision time-frequency reference source for a navigation enhancement system. Background technique [0002] In view of the time / phase synchronization accuracy requirements of the navigation augmentation system, the complex error factors, and the technical difficulty of realization, it is required that the time-frequency reference source in the navigation augmentation system realize the high precision requirements of the system frequency synchronization. As an important part of the navigation enhancement system, the frequency reference source provides a high-precision and high-stability time reference for the transmitting system and the receiving system, and it is a homologous clock and maintains a stable phase relationship. [0003] In the past, the time-frequency reference source of the navigation system mostly used the frequency accuracy of the constant tempe...

AI Technical Summary

Problems solved by technology

[0003] In the past, the time-frequency reference source of the navigation system mostly used the frequency accuracy of the constant temperature crystal oscillator as the frequency accuracy of the system. Due to the limitation of the crystal oscillator index, it was difficult to make it very high, and it could not meet the needs of high-precision systems.

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