| 基于GPS的新型二级频标锁定系统 |
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| 引用本文： | 杜保强,周渭.基于GPS的新型二级频标锁定系统[J].宇航学报,2010,31(11). |
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| 作者姓名： | 杜保强 周渭 |
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| 作者单位： | 西安电子科技大学信息处理研究所,西安,710071 |
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| 基金项目： | 国家自然科学基金(10978017,60772135); CAST创新基金(20080403) |
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| 摘 要： | 提出了一种基于GPS的新型二级频标锁定系统的设计方案。利用信号的时延稳定性和群相位差变化的规律性,产生一种基于长度游标的高精度时间间隔测量方法。将该方法应用于二级频标锁定系统中,通过对被测时间间隔进行多尺度卡尔曼滤波,在MCU控制下算出GPS与二级频标分频信号之间的相对频差;根据二级频标的频-压控制特性得到补偿电压,将该电压进行D/A转换后送到二级频标的压控端,调整输出频率,形成二级频标锁定系统。实验结果表明其锁定精度可达10-12/s量级,与传统频标锁定系统相比具有电路简单,成本低廉,附加噪声小,锁定精度高等特点。
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| 关 键 词： | 频标锁定系统 异频鉴相 群周期 长度游标 多尺度卡尔曼滤波 |
A GPS Based New Second-Class Frequency Standard Locked System |
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| DU Bao-qiang,ZHOU Wei.A GPS Based New Second-Class Frequency Standard Locked System[J].Journal of Astronautics,2010,31(11). |
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| Authors: | DU Bao-qiang ZHOU Wei |
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| Institution: | DU Bao-qiang,ZHOU Wei(Research Institute of Signal and Data Processing,Xidian University,Xi'an 710071,China) |
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| Abstract: | A GPS based new design scheme for second-class frequency standard locked system is proposed in this paper.Using the delay stability of signal and the regular changes of group phase difference,a high-accuracy time interval measurement method is generated based on length vernier.If the method is used in the second-class frequency standard locked system,and the relative frequency difference between GPS and divided frequency signal of second-class frequency standard can be calculated by using multi-scale Kalman... |
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| Keywords: | Frequency standard locked system Different frequency phase detection Group periods Length vernier Multi-scale Kalman filter |
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