摘要
研究设计了一套多通道的频率测量系统,主要设计了数字相关处理算法,解决差拍技术电路工艺对频率测量能力提高的限制问题;另外为进一步提高系统测量准确度设计了系统误差校准通道,误差校准是通过测量频率值已知的源反推系统误差实现的。系统包括3个测量通道和1个校准通道,能同时测量3个独立的10MHz频率源。经过实验验证该测量系统的本底噪声Allan方差优于4E-14/s,可用于实时高精度的测量、监控高稳频率源。
A multi-channel frequency measurement system using digital signal processing method has been developed and operated in NTSC. The design of the digital correlation algorithm can reduce the effect of beat-frequency device noise floor in this system on measurement accuracy. To improve measurement error, the system has a special calibration channel that is designed to remove the systematic error. The calibration function could be realized by using the system to measure a known frequency signal. The system consists of three independent measuring channels that can be operated simultaneously and one calibrating channel. Test experiments carried out in NTSC certify that the system can analyze and monitor high-stability frequency sources with high-precision. The Allan deviation of the measured noise floor is better than 4E-14/s.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2009年第9期1963-1968,共6页
Chinese Journal of Scientific Instrument
基金
中国科学院知识创新工程重要方向项目(KJCX2-YW-T12)
中国科学院"西部之光"人才培养计划(2007YB03)资助项目
关键词
多通道
差拍
频率测量
数字相关
校准
multi-channel
beat-frequency
frequency measurement
digital correlation
calibration
