芯片级原子钟数字温控系统设计

Design of Digital Temperature Control System for Chip-scale Atomic Clock

随着美国国防部先进项目研究局(Defence Advanced Research Projects Agency,DARPA)对微型定位导航授时技术的提出以及无人驾驶技术的发展,芯片级原子钟的市场越来越受到重视。稳定度是衡量芯片级原子钟性能的关键指标,而温度又是影响芯片级原子钟稳定度指标的重要因素,因此高精度的温控系统是芯片级原子钟稳定度的保障。设计了一种高精度的数字温度控制系统,控温精度为2m K。经过对比测试,使用该系统的芯片级原子钟稳定度较以前有了较大的改善,千秒稳定度从7.57×10^(-12)提高到4.99×10^(-12),处于世界先进水平。

With the proposal of the Micro-PNT（ Micro-Technology for Positioning,Navigation and Timing） by United States Department of Defense Advanced Projects Research Agency（ DARPA） and the development of unmanned technology,the market of chip-scale atomic clock has attracted much attention. Stability is a key parameter of the performance of chip-scale atomic clock,which is affected by the accuracy of temperature control,so a high accuracy temperature-control system is very essential to the stability of chip-scale atomic clock. A digital temperature-control system with high accuracy is designed,and its precision is 2m K. The test results show,the stability of chip-scale atomic clock is greatly improved from 7. 57 × 10^-12 to 4. 99 × 10^-12,which is in a world level.