量子电压的发展及应用

本文通过对直流电压国家副基准、可编程约瑟夫森直流电压标准、可编程量子低频电压标准、宽量程量子化电压标准、脉冲驱动型量子电压标准及便携式免液氦量子电压标准的描述，主要介绍了我国量子电压副基准的历史、现状、今后的发展及应用前景。

Development and Application of Quantum Voltage

Because of the fragility of the GNSS system,The Loran-C/BPL system has been paid more and more attention at home and abroad,as the backup of the GNSS system. How to get the precise propagation delay is always the bottleneck restricting the realization of high precision timing service in the long wave system. In this paper,the temporal variations and spatial variations of propagation delay are analyzed and the temporal variation is analyzed in detail with the actual measurement data. The result show that the received signal propagation delay temporal variations is basically the same，under the condition that the signal propagation path is similar and the weather condition in the transmission path is similar，hundreds of kilometers away from the users，which provides evidence for the BPL long wave differential timing.