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首页> 外文会议>Frequency Control Symposium and PDA Exhibition Jointly with the 17th European Frequency and Time Forum, 2003. Proceedings of the 2003 IEEE International >Estimating empirical station timing biases using IGS clock products
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Estimating empirical station timing biases using IGS clock products

机译：使用IGS时钟产品估算经验站定时偏差

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We demonstrate a method to determine empirical station timing biases for geodetic receivers located at timing laboratories. Mutual observations of GPS time, as reported by the Bureau International des Poids et Mesures (BIPM) in its circular T and as observed by the International GPS service (IGS), are used together with the Circular T offsets of the lab timescales (UTC-UTC/sub i/). This method effectively extends the previously determined calibration bias of a lab's main time transfer system differentially to a colocated geodetic receiver system, without need of any additional local measurements. The empirical biases include both the internal delays within the geodetic GPS receiver/antenna hardware as well as the intra-laboratory offset to the source of UTC/sub i/. When applied to the subset of IGS stations located at timing labs, we find that useful results can be obtained provided that the geodetic system uses a frequency standard closely related to the local UTC/sub i/ realization and that the GPS receiver does not reset its internal clock too frequently. We find daily RMS repeatabilities in some cases of about 1 to 2 ns over periods up to about a year. Given sufficient available data, the mean station bias can be estimated from a single monthly circular T update to the 1 ns level, which is smaller than the uncertainty in current absolute calibrations. This method can be used to validate laboratory calibration measurements for the geodetic systems and to continuously monitor intra-laboratory calibration stability without disrupting normal operations, It can also be exploited to improve the near real-time steering of the IGS timescale to track UTC more closely.
机译：我们演示了一种确定位于定时实验室的大地测量接收机经验站定时偏差的方法。根据国际勃艮第国际局（BIPM）在圆T中报告的和国际GPS服务（IGS）观测到的GPS时间的相互观察，与实验室时标（UTC- UTC / sub i /）。这种方法有效地将先前确定的实验室主要时间传输系统的校准偏差有差别地扩展到了共置的大地测量接收器系统，而无需任何其他本地测量。经验偏差既包括大地测量GPS接收器/天线硬件中的内部延迟，也包括实验室内部相对于UTC / sub i /的偏移量。当将其应用于位于时序实验室的IGS站子集时，我们发现，只要大地测量系统使用与本地UTC / sub i /实现紧密相关的频率标准，并且GPS接收器不会重置其频率，就可以获得有用的结果。内部时钟太频繁。我们发现在某些情况下（长达一年左右）每天的RMS重复性约为1到2 ns。如果有足够的可用数据，则可以从单个月度循环T更新到1 ns的水平来估计平均站偏差，该偏差小于当前绝对校准中的不确定性。此方法可用于验证大地测量系统的实验室校准测量结果，并在不中断正常操作的情况下连续监控实验室内部校准的稳定性，还可以利用该方法来改进IGS时标的近实时控制，以更紧密地跟踪UTC 。

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