"北斗"陆基增强系统岸台同步技术研究

导航信号同步技术是无线电导航系统的关键技术.本文介绍了"北斗"陆基增强系统的技术方案,对该系统导航信号同步技术进行了分析.利用"北斗"单向授时技术实现导航台时钟同步;采用CPLD器件设计同步脉冲提取电路及同步调整电路;利用直接频率合成技术产生高精度、高稳定度的扩频伪码时钟.实测数据分析表明,通过"北斗"授时可以保证陆基增强系统的导航台链具有较高的时钟同步精度.

BEACON SYNCHRONIZATION TECHNOLOGY FOR "BEIDOU" TERRESTRIAL IMPROVEMENT SYSTEM

Synchronization is an essential technology in the radio navigation system. The technique for improving the "Beidou" positioning ability is presented through constituting the terrestrial improvement system, and the beacon synchronization of the improvement system with the "Beidou" one-way time transfer model is realized. The direct digital synthesis (DDS) is adopted to generate the pseudo-random code clock having high precision and stability. Meanwhile, the CPLD device is used to design the synchronization pulse picking-up module, the spread spectrum PN code generator and the spread spectrum modulator. Measurement results indicate that the beacon synchronization has the high precision and the stability.