Low frequency time-code timing service is an important mode in the modern timing system. Low frequency time-code timing radio station (BPC) is built by National Time Service Center in China. Based on the modern signal characteristic of BPC, a new timing method based on frequency sharing is presented, which is the additional spread spectrum modulation timing method in idle carrier wave of BPC. The rationale of the additional spread spectrum modulation timing method in BPC is researched. The performance of the method is analyzed. The research results indicate that the coverage of low frequency signal can be enlarged by the additional spread spectrum modulation timing method, and the timing precision of BPC will be enhanced. So low frequency time-code timing service can be used broadly.
Low frequency time-code timing service is an important mode in the modern timing system, and it is actively
commended by International Telecommunications Union (ITU). Low frequency time-code timing radio station (BPC) is
built by National Time Service Center in China. The BPC broadcasts are used by millions of people to synchronize
consumer electronic products like wall clocks, clock radios, and wristwatches. In addition, BPC is used for high level
applications such as network time synchronization and frequency calibrations. Based on the modern signal characteristic
of low frequency time-code of BPC, the additional spread spectrum modulation timing method in idle carrier wave is
presented. A new structure of signal modulation is expatiated. The rationale of the additional spread spectrum
modulation timing method in BPC is researched. The performance of a new system error is analyzed. The research
results indicate that the anti-jamming performance can be improved by the additional spread spectrum modulation timing
method in BPC, and low frequency time-code timing service can then be used broadly.
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