Instantaneous geodetic positioning at medium distances with the Global Positioning System
Instantaneous geodetic positioning at medium distances with the Global Positioning System
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DOI：
10.1029/2000jb900268
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发表时间：
2000-12-10
影响因子：
3.9
通讯作者：
Bevis, M
中科院分区：
文献类型：
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作者：
Bock, Y;Nikolaidis, RM;Bevis, M
我们评估了一种新的全球定位系统（GPS）数据分析方法，称为瞬时定位，在空间尺度的长度典型的站间间距在现代地壳运动网络。该方法比传统的GPS多历元批量数据的静态和动态处理具有更高的精度和通用性。瞬时定位的关键是仅用双频相位和伪距数据的单个历元解决整数周期相位模糊度的能力，从而使接收器周跳无关。我们估计三维相对坐标和大气天顶延迟参数独立每30秒超过12周的时间内基线距离为50米，14公里：和37公里。单历元坐标解的水平精度约为15 mm，垂直精度约为7-8倍。去除每个时间序列中以恰好I个恒星日的周期重复的分量，从而表明信号多径，在所有分量中减少约50%的散射。高频时间序列的解平均可以使用大量的测量历元来执行，以进一步提高坐标精度。我们证明，每日坐标估计与瞬时定位更精确（由20-50%，每个坐标分量）比那些估计与24小时批处理。单历元解的频谱分析表明，在较低频段观测到的GPS时间序列的闪烁噪声特性也会影响0.01 mHz至10 mHz频段的GPS解。我们认为闪烁噪声是由对流层效应引起的。由于现代GPS接收机能够在高达10 Hz的频率下进行观测，因此我们的技术与宽带地震学的频带显著重叠和互补，并有利于其他研究领域，如地震大地测量学，火山学和GPS气象学。
We evaluate a new method of Global Positioning System (GPS) data analysis, called instantaneous positioning, at spatial scale lengths typical of interstation spacings in a modern crustal motion network. This method is more precise and versatile than traditional GPS static and kinematic processing of multi-epoch batches of data. The key to instantaneous positioning is the ability to resolve integer-cycle phase ambiguities with only a single epoch of dual-frequency phase and pseudorange data, rendering receiver cycle slips irrelevant. We estimate three-dimensional relative coordinates and atmospheric zenith delay parameters independently every 30 s over a 12-week period for baseline distances of 50 m, 14 km: and 37 km. Horizontal precision of a single-epoch coordinate solution is about 15 mm and vertical precision is about 7-8 times worse. Removing that component of each time series which repeats with a period of exactly I sidereal day, and thus manifests signal multipath, reduces the scatter by about 50% in all components. Solution averaging of the high frequency time series can be performed using: ally number of measurement epochs to further improve coordinate precision. We demonstrate that the daily coordinates estimated with instantaneous positioning are more precise (by 20-50% per coordinate component) than those estimated with 24-hour batch processing. Spectral analysis of the single-epoch solutions indicates that the flicker noise characteristic of GPS time series observed in lower-frequency bands also affects GPS solutions in the frequency band 0.01 mHz to 10 mHz. We argue that the flicker noise is induced by tropospheric effects. Since modern GPS receivers are capable of observing at frequencies as high as 10 Hz, our technique significantly overlaps and complements the frequency band of broadband seismology and benefits other research areas such as earthquake geodesy, volcanology, and GPS meteorology.