介绍了一种用于射频识别(Radio Frequency Identification,RFID)系统读写器的数字鉴相器(DPFD)工作原理及其应用,并结合二分频率搜索方案,实现对数控振荡器频率预设字的控制和调整。采用EDA软件中的VHDL编程完成该系统的设计与仿真,仿...介绍了一种用于射频识别(Radio Frequency Identification,RFID)系统读写器的数字鉴相器(DPFD)工作原理及其应用,并结合二分频率搜索方案,实现对数控振荡器频率预设字的控制和调整。采用EDA软件中的VHDL编程完成该系统的设计与仿真,仿真结果表明,该数字鉴相器具有快速相位检测和频率采集的功能。展开更多
This article proposes a new physics package to enhance the frequency stability of the space cold atom clock with the advantages of a microgravity environment. Clock working processes, including atom cooling, atomic st...This article proposes a new physics package to enhance the frequency stability of the space cold atom clock with the advantages of a microgravity environment. Clock working processes, including atom cooling, atomic state preparation,microwave interrogation, and transition probability detection, are integrated into the cylindrical microwave cavity to achieve a high-performance and compact physics package for the space cold atom clock. We present the detailed design and ground-test results of the cold atom clock physics package in this article, which demonstrates a frequency stability of 1.2×10^(-12) τ^(-1/2) with a Ramsey linewidth of 12.5 Hz, and a better performance is predicted with a 1 Hz or a narrower Ramsey linewidth in microgravity environment. The miniaturized cold atom clock based on intracavity cooling has great potential for achieving space high-precision time-frequency reference in the future.展开更多
文摘介绍了一种用于射频识别(Radio Frequency Identification,RFID)系统读写器的数字鉴相器(DPFD)工作原理及其应用,并结合二分频率搜索方案,实现对数控振荡器频率预设字的控制和调整。采用EDA软件中的VHDL编程完成该系统的设计与仿真,仿真结果表明,该数字鉴相器具有快速相位检测和频率采集的功能。
基金Project supported by the Space Application System of China Manned Space Programthe Youth Innovation Promotion Association,CAS。
文摘This article proposes a new physics package to enhance the frequency stability of the space cold atom clock with the advantages of a microgravity environment. Clock working processes, including atom cooling, atomic state preparation,microwave interrogation, and transition probability detection, are integrated into the cylindrical microwave cavity to achieve a high-performance and compact physics package for the space cold atom clock. We present the detailed design and ground-test results of the cold atom clock physics package in this article, which demonstrates a frequency stability of 1.2×10^(-12) τ^(-1/2) with a Ramsey linewidth of 12.5 Hz, and a better performance is predicted with a 1 Hz or a narrower Ramsey linewidth in microgravity environment. The miniaturized cold atom clock based on intracavity cooling has great potential for achieving space high-precision time-frequency reference in the future.
