Signal-delay phase measurements have been performed with Ku-band Earth station and VSAT (very-small-aperture terminal) facilities in various loop-around schemes using both a satellite simulator and geostationary satellites. Stability plots show that the standard deviation of pair differences ( sigma /sub y/) is 4*10/sup -10/ /sub tau //sup -1/ for a C/No (carrier-to-noise density) ratio of 65 dB-Hz. This white-noise behavior continues for several days, when satellite simulator data shows sigma /sub y/ to be 3*10/sup -15/. Absolute phase-delay measurements show reproducibility to better than 1 ns over a 16-day sample time. This suggests the potential for accuracy to this level, given an appropriate calibration. A measurement method is described which determines the principal time-delay constant affecting the accuracy of time synchronization using a two-way satellite communications technique.
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机译：已使用卫星模拟器和对地静止卫星，以各种环回方案在Ku波段地球站和VSAT（超小孔径终端）设施中进行了信号延迟相位测量。稳定性图表明，对于C / No（载噪比）的C / No（载噪比）比，对差分（sigma / sub y /）的标准偏差为4 * 10 / sup -10 / / sub tau // sup -1 / 65 dB-赫兹。当卫星模拟器数据显示sigma / sub y /为3 * 10 / sup -15 /时，这种白噪声行为会持续几天。绝对相位延迟测量显示出在16天的采样时间内重现性优于1 ns。如果进行了适当的校准，这表明精度有可能达到该水平。描述了一种测量方法，该方法使用双向卫星通信技术确定影响时间同步精度的主要时间延迟常数。
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