时间频率学报

根据国际上一些实验室(USNO、TAO、CRL)和国际计量局(BIPM)在时间公报上公布的GPS时间比对数据,对其长期频率稳定度进行了计算分析,结果如下: 1.GPS时间比对的长期频率稳定度不受地域的影响,不同地区和不同卫星的结果都有明显的相似性; 2.长期频率稳定度的结果(随取样时间变化)为: 1.5×10^-13～3.0×10^-13(τ=1d) 1.0×10^-13～1.5×10^-13(τ=5d～30d) 5.0×10^-14～8.0×10^-14(τ=60d～100d) 3.长期频率稳定度的模型(随取样时间变化)为: τ=1d～3d时为白频噪声τ=3d～32d时为闪频噪声τ=32d～65d时为白频噪声或白相噪声τ=65d～100d时为闪频噪声。

According to the data of GPS time comparison published by the laboratories (USNO, TAP, CRL) and BIPM in the time bulletins the long term frequency stability in the GPS time comparison are calculated and analysed in this paper. The results are as follows: 1. The long term frequency stability is not affected by the district, the results are obviously similar to each other for different regions and different satellites. 2. The results of the long term frequency stability, which changes with the sampling time, are 1.5～3.0E-13(r=1 day), 1.0～1.5E-13[τ=(5～30)days] and 5～8E-14[τ=(60～100)days]. 3. The modles of the long term. frequency stability, which change with the sampling time, are as follows: (1). FM white noise [τ=(1～3)days]; (2). FM flicker noise [τ=(3～32)days]; (3). FM white noise or PM white noise [τ=(32～65)days]; (4). FM flicker noise [τ=(65～100)days].