Satellite time serving all-in-one machine and time serving method thereof

Abstract

The invention discloses a satellite time serving all-in-one machine and time serving method thereof. The remote end and the close end of a satellite for serving time are integrated into a whole body and interact a differential signal with time-served devices through cables; as the reliable transmission distance of the differential signal is larger than that of a single-end electric characteristicsignal, the effective transmission of a timing mark signal and time information can be guaranteed even if the transmission distance of the cables between the time-served devices is more than 10m; meanwhile, the timing mark signal error caused by the expansion of the transmission distance can be reduced through measuring time delay of the cables and correcting the time delay of the timing mark signal according to the measuring result, therefore, the timing mark signal can be guaranteed to be transmitted accurately; and moreover, as the remote end and the close end are integrated into a whole body, various problems caused by that the length of radio frequency cables between the remote end and the close end exceeds 100m are solved. Therefore, the invention can simultaneously guarantee the convenience for engineering installation and the time serving reliability.

Description

technical field [0001] The invention relates to satellite timing technology, in particular to a satellite timing integrated machine and a timing method of the satellite timing integrated machine. Background technique [0002] In modern communication and measurement and control systems, it is necessary for multiple devices to maintain mutual synchronization between the time systems for a long time, and the synchronization accuracy needs to reach the sub-microsecond (us) level or even nanosecond (ns) level. At present, the timing schemes that can achieve sub-us level or ns level synchronization accuracy include ground wired timing system and satellite timing. Among them, the ground wired time service network is generally a local time service private network, but it cannot be widely used due to the limitations of the network deployment area and network privateness; while the satellite time service has the characteristics of openness, wide coverage, high precision, and low cost....

AI Technical Summary

Problems solved by technology

[0004] However, since the near-end GPS star card 120 and the time-serving device adopt a single-ended electrical characteristic signal 140, that is, a signal that only takes the ground as a reference, in order to avoid the transmitted signal from being interfered, only the near-end GPS star card 120 The transmission distance with the timing device is limited within 10 meters

[0005] In addition, the length of the RF cable between the far end and the near end cannot exceed 100 meters due to the losses caused by the RF cable

Therefore, when it is necessary to ensure that the transmission distance between the near-end star card and the timed device does not exceed 10 meters, and the length of the radio frequency cable between the far-end and the near-end does not exceed 100 meters, it will make the far-end and the near-end The near-end engineering installation is more difficult; on the contrary, if the above-mentioned distance limit cannot be ensured during the engineering installation, the timing reliability of the split satellite timing equipment to the timing equipment will be greatly reduced due to the failure to meet the ideal working conditions

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