摘要
研究了通过电学补偿且基于FPGA(field programmable gate array)设计实现的频率远距离稳定传输问题。根据共轭相位补偿法原理,设计了基于FPGA的数字锁相环频率远距离稳定传输方案。该方案通过4次变频及滤波来提取远端信号和本地信号的相位差,利用锁相环使远端的信号相位变化与本地点的基准信号相位变化相同,从而实现频率远距离稳定传输。在基于FPGA的数字信号处理板上对该方案进行了实现,并给出了具体的实现方案和FPGA实现结果。由于变频、滤波及锁相环均在FPGA内部通过编程实现,该实现方案具有很强的参数选择灵活性及工程易实现性。最后,设计了链路时延测量回路,对不同条件下频率传输的稳定性进行测量,测量结果表明,设计的频率传输方案有效地减小了环境温度变化对信号在光纤中传输时延的影响。
This paper studies a long-distance stable radio frequency transfer based on FPGA. Firstly,a long-distance stable radio frequency transfer scheme was designed based on phase locking loop（ PLL） according to the conjugating phase compensations. The phase difference between the outlying signal and local signal was acquired through four frequency conversions and filters,and PLL was used to make the phase conversion consistently which ensure long-distance stable radio frequency transfer. Secondly,the scheme was implemented on the FPGA,and the FPGA implementation result was given also. Lastly,a test bench was designed to test the stability of frequency transition,and the result indicated that the scheme was effective on decrease the frequency transfer variation affected by environment temperature.
出处
《重庆邮电大学学报（自然科学版）》
CSCD
北大核心
2015年第5期614-619,共6页
Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)
基金
航天飞行动力学技术重点实验室开放基金(2013afdl009)~~
关键词
频率传输
数字锁相环
相位抖动
电学补偿
frequency transfer
digital phase-locking loop
phase fluctuations electrical compensations
