Design on time-frequency signal generation and maintenance system of digital scheme

被引：0

作者：

Feng, Lei ^{[1
,2
]}

Shuai, Tao ^{[3
]}

Li, Guotong ^{[2
]}

Shang, Lin ^{[2
]}

机构：

[1] Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Science, Shanghai

[2] Shanghai Engineering Center for Micro Satellites, Shanghai

[3] Shanghai Astrononical Observatory, Shanghai

来源：

Journal of Computational Information Systems | 2015年 / 11卷 / 20期

关键词：

DDS; DPLL; Stability;

D O I：

10.12733/jcis15678

中图分类号：

学科分类号：

摘要：

The Global Navigation Satellite System (GNSS) can be considered as a sophisticated system of time, which is maintained by the subsystem of atomic clock and Time-Frequency Signal Generation and Maintenance. A lot of analog devices are used in Galileo's Time-Frequency system, which brings bad effects on reliability, power consumption and weight. In view of the defects in Galileo, a new full-digital scheme is proposed in this paper. Based on DPLL and DDS, we realize the signal processing in FPGA, which leads to great improvement in all respects. And the most important is that, we get much better stability of output signal than Galileo scheme with the combination of Clean-Up Module and OCXO Driving Module. During tests, the digital scheme performed well. It can be used in China's BeiDou Navigation Satellite System. Copyright © 2015 Binary Information Press.

引用

页码：7461 / 7472

页数：11