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Characteristics and Applications of Precise GPS Clock Solutions Every 30 Seconds

机译:每30秒精确GPS时钟解决方案的特性和应用

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摘要

Using carrier phase and pseudorange data from a small network of globally distributed GPS receivers with precise time references, we are able to estimate GPS clock parameters every 30 s, with subdecimeter accuracy, in a computationally efficient manner. The accuracy obtained is a factor of 100 to 1000 times better than that of clocks in the broadcast navigation message, and allows post- processing of high-rate single-receiver kinematic GPS data with few-centimeter-level precision when used in conjunction with precise GPS orbits. The amplitude of the daily clock variability is typically 24 m for satellites affected by Selective Availability (SA). Temporal variations are well modeled by an autocorrelation function ρ=exp(-d~2/2τ~2) with τ≈106 s.
机译:通过使用来自小型全球分布GPS接收器网络的载波相位和伪距数据以及精确的时间基准,我们能够以计算有效的方式每30 s估算亚米精度的GPS时钟参数。所获得的精度比广播导航消息中的时钟精度高100到1000倍,并且当与精确度结合使用时,可以以几厘米的精度对高速单接收机运动GPS数据进行后处理。 GPS轨道。对于受选择性可用性(SA)影响的卫星,每日时钟可变性的幅度通常为24 m。时间变化可以通过自相关函数ρ= exp(-d〜2 /2τ〜2)与τ≈106s很好地建模。

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