卫星双向时间频率比对软件接收技术研究

研究了一种基于软件无线电接收机(SDR)的卫星双向时间频率传递技术(TWSTFT),该技术能明显降低卫星双向比对中的测量噪声,与基于卫星时间调制解调器(SATRE)的TWSTFT相比,SDR TWSTFT表现出更优良的性能。在基于AM22通信卫星的亚洲-欧洲卫星双向比对链路中,NIM与俄罗斯计量院(SU)之间的SDR TWSTFT结果相对于SATRE TWSTFT得到明显改善,增益因子的平均值为2.0;同时,NIM-SU SDR链路也是全球第一条周日变化误差得到明显改善的长基线洲际SDR TWSTFT链路。分析了基于ABS-2A通信卫星的SDR TWSTFT和SATRE TWSTFT时间稳定度计算结果,结果表明SDR TWSTFT对短期链路噪声的抑制效果更为显著。

Research of Software Designed Receiver on Two Way Satellite Time and Frequency Transfer

A research on two-way satellite time and frequency transfer (TWSTFT) based on software-defined radio (SDR) receivers is proposed, it could reduce the diurnals and also the measurement noise considerably. SDR TWSTFT shows superior performance to that of SATRE TWSTFT for all links. NIM has participated the pilot study in Aisa-Europre link via satellite AM22, the SU-NIM SATRE TWSTFT is a long-distance baseline between SU in Russia and NIM in Beijing (China). As shown in the results, the gain of SDR TWSTFT over SATRE TWSTFT is obviously significant for the SU-NIM baseline, the mean gain factor in TDev is 2.0. The SU-NIM link is the only one long-distance baseline which get a obviously significant gain. Then, the time stability of ABS-2A link is analyzed, it is shown that SDR TWSTFT has a better gain on short-term link noise suppression.