GPS time service device for providing high-precision large-step time synchronizing signals

Abstract

The invention provides a GPS time service device for providing high-precision large-step time synchronizing signals. The GPS time service device comprises a quartz crystal oscillator, a GPS receiving chip and a digital signal processor. The quartz crystal oscillator is used for providing 10MHz reference frequency. The GPS receiving chip is used for providing 1Hz standard time synchronizing signals. In the digital signal processor, a frequency divider outputs the 1Hz standard time synchronizing signals to a frequency calibration circuit; on a satellite unlocking condition, the 1Hz time synchronizing signals serve as input signals of a time difference calibration circuit, and the frequency calibration circuit outputs 10MHz calibration frequency to a frequency multiplier 1 and a frequency multiplier 2. The time difference calibration circuit outputs calibration values of the 1Hz time synchronizing signals to the frequency multiplier 1 after conducting time difference calibration on the satellite unlocking condition. The frequency multiplier 1 outputs large-step time synchronizing signals on the satellite unlocking condition. The frequency multiplier 2 outputs large-step time synchronizing signals on a satellite locking condition. The GPS time service device is reasonable in design, simple in structure, completely practical and capable of improving the time service precision.

Description

technical field [0001] The invention relates to GPS timing technology, in particular to a GPS timing device for providing high-precision large-step long-time synchronization signals. Background technique [0002] GPS is the abbreviation of Global Positioning System (Global Positioning System) in English. Due to its advantages of high precision, good stability and wide coverage, GPS timing has been widely used in navigation, geodetic survey, time synchronization, electric power and other fields. Its basic principle is Utilize the high-precision atomic clock of the GPS satellite and the ground control system to provide users with high-precision time information, which can achieve us-level time accuracy. However, a general GPS receiver can only provide a standard time synchronization signal with a step size of 1 Hz, which cannot meet the needs of users for time synchronization signals with high precision and large step size (>1 Hz). Contents of the invention [0003] The ...

AI Technical Summary

Problems solved by technology

However, the general GPS receiver can only provide a standard time synchronization signal with a step size of 1Hz, which cannot meet the user's needs for a time synchronization signal with high precision and a large step size (>1Hz).

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