地面稳相频标传输系统设计和测试

发布时间：2019-03-26 17:48

【摘要】：设计了一款1.5 GHz的稳相频标传输装置,具有实时和事后补偿能力,并且兼容了同轴电缆和光纤两种传输介质.对装置的稳相原理和性能进行了分析和评估,然后对同轴电缆稳相系统的性能进行了测试.结果表明,基于目前的测试环境,与未稳相时相比,实时补偿模式可以改善相位变化112倍以上,积分时间长于7 s时,频率稳定度明显提升,长于60s的频率稳定度有1个数量级的改善;事后补偿模式可以改善40倍相位波动,积分时间长于2.5 s频率稳定度明显提升,长于40 s的频率稳定度有1个数量级的改善.对于更长时间积分的频率稳定度,实时和事后补偿模式均可以改善1.5个数量级以上,装置能有效抑制因传输介质的温度系数等因素导致的缓慢伸缩效应.
[Abstract]:A 1.5 GHz stable phase frequency standard transmission device is designed, which has real-time and post-compensation capability, and is compatible with coaxial cable and optical fiber transmission medium. The phase stabilization principle and performance of the equipment are analyzed and evaluated, and then the performance of the coaxial cable phase stabilization system is tested. The results show that the real-time compensation mode can improve the phase change by more than 112 times, and the frequency stability can be improved obviously when the integration time is longer than 7 s, compared with the unstable phase, the real-time compensation mode can improve the phase change more than 112 times based on the current test environment. The frequency stability longer than 60 s has an order of magnitude improvement. The post-compensation mode can improve the 40-fold phase fluctuation, the integration time is longer than 2.5 s, and the frequency stability is improved by one order of magnitude when the integration time is longer than 2. 5 s. For the frequency stability of longer time integrals, both real-time and post-compensation modes can be improved by more than 1.5 orders of magnitude. The device can effectively suppress the slow stretching effect caused by the temperature coefficient of the transmission medium.
【作者单位】：中国科学院上海天文台;中国科学院射电天文重点实验室;桂林电子科技大学;
【基金】：国家自然科学基金项目(11303076)资助
【分类号】：P164

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