| 基于Helmert变换的GPS动力学轨道平滑(英文) |
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| 引用本文： | 王解先.基于Helmert变换的GPS动力学轨道平滑(英文)[J].地球空间信息科学学报,2009,12(2):95-99. |
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| 作者姓名： | 王解先 |
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| 摘 要： | Orbit fitting is used in many GPS applications. For example, in Precise Point Positioning (PPP), GPS orbits (SP3 orbits) are normally retrieved either from IGS or from one of its Analysis Centers (ACs) with 15 minutes’ sampling, which is much bigger than the normal observation sampling. Therefore, algorithms should be derived to fit GPS orbits to the observation time. Many methods based on interpolation were developed. Using these methods the orbits fit well at the sampling points. However, these methods ig...
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| 关 键 词： | 平滑 动力学 轨道 变换 |
| 收稿时间： | 22 November 2008 |
Orbit fitting based on Helmert transformation |
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| Junping Chen,Jiexian Wang.Orbit fitting based on Helmert transformation[J].Geo-Spatial Information Science,2009,12(2):95-99. |
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| Authors: | Junping Chen Jiexian Wang |
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| Institution: | (1) Deutsches GeoForschungsZentrum - GFZ, 14473 Potsdam, Germany;(2) Department of Surveying and Geomatics, Tongji University, 1239 Siping Road, Shanghai, 200092, China |
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| Abstract: | Orbit fitting is used in many GPS applications. For example, in Precise Point Positioning (PPP), GPS orbits (SP3 orbits) are
normally retrieved either from IGS or from one of its Analysis Centers (ACs) with 15 minutes’ sampling, which is much bigger
than the normal observation sampling. Therefore, algorithms should be derived to fit GPS orbits to the observation time. Many
methods based on interpolation were developed. Using these methods the orbits fit well at the sampling points. However, these
methods ignore the physical motion model of GPS satellites. Therefore, the trajectories may not fit the true orbits at the
periods in between 2 sampling epochs. To solve this problem, we develop a dynamic approach, in which a model based on Helmert
transformation is developed in GPS orbit fitting. In this orbit fitting approach, GPS orbits at sampling points are treated
as pseudo-observations. Thereafter, Helmert transformation is built up between the pseudo-observations and dynamically integrated
orbits at each epoch. A set of Helmert parameters together with corrections of GPS initial orbits are then modeled as unknown
parameters. Results show that the final fit orbits have the same precision as the IGS final orbits.
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| Keywords: | precise point positioning (PPP) IGS orbits orbit fitting Helmert transformation |
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