摘要
时频基准驱动的系统要求提供频率相位连续的时频信号,这对时频信号产生系统的可靠性提出要求,目前,冗余备份是提高设备可靠性的主要手段,可靠的时频信号产生系统通常由主备多台原子钟、在线监测设备、钟组合算法和控制设备组成,以原子钟的性能监测结果为基础,通过实施组合算法计算频率或相位调整量,驾驭各钟输出的时频信号。如何获得最优性能的时频信号,在线监测设备准确、实时评估原子钟性能是关键。在分析原子钟关键指标的基础上,提出了多台原子钟频率、相位性能并行比较的数字测量方法,研究了使用比对结果获得相位连续、频率稳定信号的方法。最后根据该方法研制了原理样机,样机的测试结果验证该方法满足铯或氢原子钟等高性能原子钟组在线实时监测需求,其中测试10 MHz信号源阿伦方差表征的设备本底噪声为3.4E-14/s,达到了世界先进水平。
In order to obtain continuous phase and frequency signals, building atomic clock ensemble is considered to be an important solution, and the system reliability is required. The system usually consists of multiple atomic clocks, on-line monitoring instrument, atomic time algorithm and control equipment. Based on the monitoring results of atomic clock performance, the combined atomic time algorithm is used to acquire the adjustment values of frequency or phase, and then steer the output time and frequency signals of the clocks. How to acquire the best performance fre- quency signal is a hot issue. The key is to acquire the time and frequency signals with optimum performance and eval- uate the performance of the atomic clocks accurately and in real-time with on-line monitoring instrument. On the basis of analyzing the key indexes of atomic clocks, the author proposes a digital performance monitoring method, which synchronously compares and analyzes the phase and frequency differences of multiple atomic clocks ; then, studies the methods of acquiring continuous phase and stabilized frequency signals using the measurement results. A prototype was developed according to proposed method. The prototype test results show that the method can meet the require- ment of on-line real-time monitoring high performance atomic clock group, such as cesium atomic clocks and active hydrogen masers. The test result of 10 MHz sources shows that the Allan deviation noise floor is about 3.4E - 14/s, which reaches the world advanced level.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2013年第10期2177-2183,共7页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金(61001076
11033004)资助项目
关键词
原子钟
在线监测
相位比对
atomic clock
on-line monitoring
phase comparison
