在卫星导航系统建设需求的推动下，POP铷钟的短期频率稳定度已取得了非常好的结果，但其长期频率稳定度在国际范围内均普遍较差，仅为1E-14水平，主要限制因素是物理系统的温度敏感性。为了推进我国新一代星载原子钟的研制进展，本项目拟设计一种基于磁控管微波腔的POP铷钟物理系统，在保证高信噪比的前提下，通过提高温度均匀性、改善系统真空适应性和优化温度系数等途径，探索降低POP铷钟物理系统温度敏感性的方法。最终目标是将温度效应对长期频率稳定度的影响降低一个量级，率先实现一种满足1E-15量级POP铷钟设计要求的物理系统。

With the promotion of global navigation satellite systems, the POP Rb clock has achieved desirable short-term frequency stability. While, the long-term frequency stability is just at 1E-14 level, which is mainly limited by the temperature sensitivity of the physics package. To promote the research on next generation spaceborne atomic clock，the project will design a physics package with magnetron cavity. On the promise of high signal to noise ratio, the temperature sensitivity will be reduced by one order of magnitude through uniforming temperature distribution，improving vacuum adaptability, optimizing temperature coefficient, etc. Finally, a physics package, which could meet the requirement of 1E-15 level POP Rb clock, will be realized.