GPS驯服CPT原子钟方法研究

本文针对全球定位系统（GPS，Global Position System）接收机输出秒脉冲（1PPS，1 Pulse Per Second）信号的特点，以及相干布居囚禁（CPT，Coherent Population Trapping）原子钟输出频率信号的特性，设计并实现了GPS驯服CPT原子钟方案.我们建立了适合抑制1PPS信号抖动的卡尔曼滤波模型，通过理论推导和计算获得了相应噪声参数，并采用卡尔曼滤波器与平均滤波器相结合，对CPT原子钟输出频率实施滤波处理，并用GPS接收机输出的1PPS信号实施频率校准，所实现GPS驯服的CPT原子钟输出频率的中短期频率误差降低半个量级，天频率稳定度提高一个量级.

Study on GPS-Disciplined CPT Atomic Clock

Based on the features of the output one-pulse-per-second (1PPS) signal of the Global Positioning System (GPS) receiver,and the characteristics of the output frequency signal of the Coherent Population Trapping (CPT) atomic clock,we design and realize a GPS-disciplined CPT atomic clock device.For depressing jitter noise of the 1 PPS signal,we have established the corresponding Kalman filter mathematics model,obtained the noise parameters through theoretical calculation.We have experimentally filter processed the frequency signal of CPT atomic clock with a combination of the Averaging filter and Kalman filter,and calibrated the output frequency of CPT atomic clock with the 1PPS signal,and achieved that reducing the medium and short term frequency error by half magnitude and improving day frequency stability by one order of magnitude.