摘要
采用时间数字转换技术,设计了基于嵌入式计算机、高精度DA转换器、时间数字转换芯片和计算机测控软件的GPS驯服铷钟结构方案。对GPS定时信号进行测量和统计分析,根据其短期抖动量较大和长期平均无漂移的特点,对驯服铷钟的噪声滤波算法、频率偏差的解算方法、铷钟控制算法策略进行研究,提出了一种结合算术平均、滑动平均值滤波和最小二乘法拟合的数据处理方法和分部控制策略,克服了GPS定时信号脉冲抖动对驯服效果的影响,提高了驯服速度。用摩托罗拉M12TGPS接收机进行了实验,结果表明,系统具有较好的短期稳定性,在有效跟踪GPS9小时后,铷钟的平均频率准确度达到3×10-12量级。
Basing on time-to-digit-converter technology,the construction of the GPS disciplined Rubidium frequency standard is introduced,the algorithm based on embedded micro-computer,high precise DA converter,time-to-digit-converter and the control software is invented.The GPS timing signal is measured and analyzed,it can beassumed that the timing signal has a large jitter,but it has no bias over a long haul.The noise filter method,the frequency difference calculaton method and the control method are studied,the method combined with mathematic average,shift average numeric filter,least square fitting method and the two step control method are used to overcome thetime jitter,the disciplined speed is rapid.In this paper,a Motorola M12T receiver is used to discipline the Rubidium,theresult shows that the rubidium can be disciplined rapidly and has a good short term stability.The GPS is traced in 9hours,its accuracy can reach 3×10？12average between 14 hours.
出处
《电子测量与仪器学报》
CSCD
2010年第9期808-813,共6页
Journal of Electronic Measurement and Instrumentation
关键词
滑动平均值滤波
GPS
驯服
铷钟
shift average numeric filter
GPS
discipline
rubidium
