Optical fiber remote centralized timing system and timing method based on BD and GPS

Abstract

The present invention discloses an optical fiber remote centralized timing system and method based on BD and GPS. The system comprises at least one satellite antenna, an active timing host and at least one active timing distribution unit. The satellite antenna is connected with the active timing host. The optical fiber remote centralized timing system based on BD and GPS is composed of a BD / GPS antenna, 1+1 primary and secondary units and the distribution unit, so as to improve accuracy and safety of base station timing. A photoelectric hybrid cable is adopted for transmission, which can transmit at least one kilometer. An optical fiber can be stretched to 20 kilometers if a manner of taking nearest electricity is adopted, thereby fundamentally solving the problem of affecting a base station location due to the limited transmission distance.

Description

Technical field [0001] The invention belongs to the technical field of the mobile communication industry, and particularly relates to a BD and GPS-based optical fiber remote centralized time service system and a time service method. Background technique [0002] Timing refers to the equipment in the communication network that obtains a unified clock source signal to achieve synchronization between network devices. The current mobile communication network generally uses satellite on-board clocks as the clock source. The Global Positioning System (GPS) in the United States and the BeiDou Navigation Satellite System (BDS) in China have the ability to provide time for mobile communication networks. [0003] At present, most of the base stations operating on the network in China use a single GPS satellite clock as a clock source, and use traditional GPS time service antennas to obtain clock signals and transmit them to the baseband processing unit (hereinafter referred to as BBU) of the...

AI Technical Summary

Problems solved by technology

The antenna is connected to the receiver on the BBU side of the base station through a radio frequency feeder. The radio frequency feeder is thick and has poor flexibility and is not easy to bend. The signal attenuates quickly, and a line compensation amplifier is required for long-distance transmission.

The characteristics of RF feeders reduce the flexibility of BBU equipment room location selection, increasing construction difficulty and maintenance costs, such as figure 1 shown

In addition, GPS is an important infrastructure for the US military to realize its strategic and tactical intentions. Under exceptional circumstances, once the system is shut down or interfered with, the communication system will be paralyzed, posing a huge security risk

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