High precision time benchmarks have become one of the basic guarantee platforms in fields such as communication, power, broadcasting and television, security monitoring, and industrial control. The satellite navigation and positioning system can provide high-precision, all-weather, and all-weather navigation, positioning, and timing services, with excellent timing performance; High precision and low cost; Safe and reliable; All weather; Wide coverage.

　　GPS clock is also a basic time service application product developed based on the latest high-precision GPS positioning and time service module. Capable of outputting time information formats that meet user requirements, thereby completing synchronous time service. GPS clocks are mainly divided into two types. One type is GPS timing instruments, which mainly output time scale information, including 1PPS and TOD information; Another type is GPS synchronous clocks, which output high stable frequency information obtained by taming OCXO or rubidium clocks using satellite signals, as well as more stable time scale signals recovered locally.

　　The GPS synchronous clock mainly consists of the following parts: GPS/GNSS receiver, which can be GPS/GLONASS/BD/GALILEO, high-precision OCXO or rubidium clock, local synchronous calibration unit, measurement unit, error processing and control structure, input and output, etc.

　　Its main principle is to tame the crystal oscillator through GPS or other Satellite navigation signals, so as to achieve high-precision frequency and time signal output, which is the most effective way to achieve nanosecond time service accuracy and stability at 1E12 frequency output.

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