Regenerative UTC (Universal Time Coordinated) atomic time ultrahigh precision time frequency synchronization network

Abstract

The invention discloses a regenerative UTC (Universal Time Coordinated) atomic time ultrahigh precision time frequency synchronization network. The regenerative UTC atomic time ultrahigh precision time frequency synchronization network is connected with a time synchronization master station and a time synchronization slave station through optical fibers. An interprovincial and interurban primary communication network is established and borne on an optical-cable optical transport network. HTF-BITS equipment is respectively arranged on the time synchronization master station and the time synchronization slave station. A caesium clock Cs, a rubidium clock Rb, a DCXO (Digital Control X-tal Crystal Oscillator) or a VCXO (Voltage Control X-tal Crystal Oscillator) is arranged on each piece of HTF-BITS equipment. The ultrahigh precision time frequency synchronization or mutual synchronization between the caesium clocks is completed; or the master-slave synchronization between the caesium clocks and the rubidium clocks is completed; the mutual synchronization between the caesium clocks is completed; the master-slave synchronization between the rubidium clocks and the DCXOs is completed; the mutual synchronization between the DCXOs is completed; the master-slave synchronization between the DCXOs and the VCXOs is completed; and as long as the synchronization network normally operates, any node can be a regenerative UTC atomic time frequency standard. The invention provides the novel all-round underground high-precision time frequency synchronization network which is used for transmitting the high-precision time reference by an underground optical-cable optical transmission system without depending on sky time established by navigation systems such as a GPS (Global Positioning System), the Beidou and the like.

Description

technical field [0001] The invention belongs to the technical field of UTC synchronization, and relates to a time-frequency synchronization network, in particular to an ultra-high-precision time-frequency synchronization network when regenerating UTC atoms. Background technique [0002] The sky time and frequency synchronization reference synchronization network established by satellite navigation systems such as Beidou, GPS, GLONASS, etc. has the advantage that any person or sensor can obtain a time reference with a difference of 300ns or less from UTC at any place on the earth at any time , providing services such as frequency reference <1E-11 / day. [0003] However, there are inevitably problems with the safety and reliability of the air time-frequency synchronization network. First, the harsh natural and climatic factors in space / air affect the accuracy of satellite positioning and navigation timing; another important safety factor is that the availability of the satel...

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Problems solved by technology

[0003] However, there are inevitably problems with the safety and reliability of the air time-frequency synchronization network. First, the harsh natural and climatic factors in space / air affect the accuracy of satellite positioning and navigation timing; another important safety factor is that the availability of the satellite navigation system is completely restricted by the country that owns the system and is easily under attack to render the ground receiving system unable to receive the air time-frequency reference signal

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