GNSS-R星载测高的动态性误差和信号平行误差研究

基于目前GNSS-R(global navigation satellite systems reflectometry)星载测高的几何路径延迟模型,分析了模型中存在的动态性误差和信号平行误差,给出了产生误差的原因以及了误差的解析表达式。为了获得误差的量级大小,首先采用部分UK-DMC(united kingdom disaster monitor constellation)星载数据进行实验,得到了动态性误差和信号平行误差的在实验中的大小;然后以CHAMP(challenging mini-satellite payload)和COSMIC (constellation observing system for meteorology, ionosphere and climate)低轨卫星作为接收机平台,进行了大量的仿真分析。综合实例和仿真分析的结果,得出这两项误差能够达到m级的结论,这是在测高中不能被忽略的。最后给出了如何用精密的发射机和接收机轨道信息来校正这两项误差的方法。

Dynamic Error and Parallel Signal Error in GNSS-R Spaceborne Altimetry

Based on the present geometry delay models of GNSS-R (global navigation satellite systems reflectometry) spaceborne altimetry, dynamic error and parallel signal error are studied. Apart from analyzing the reasons causing these two errors, this paper gives the analytical expressions of both errors. In order to obtain the magnitudes of dynamic error and parallel signal error, this paper first utilizes a segment of actual experimental data from the satellites of UK-DMC (united kingdom disaster monitor constellation) to test the magnitudes of dynamic error and parallel error, getting both errors of this set of data. Furthermore, regarding CHAMP (challenging mini-satellite payload) and COSMIC (constellation observing system for meteorology, ionosphere and climate) satellites as the platforms of receivers, a host of simulated data are used to detect the magnitudes of both errors. The conclusion that these two errors can be as great as the meter level, which cannot be ignored in altimetry, is reached after considering the results of two kinds of experiments. Finally, a solution of using the precise orbits information of transmitter and receiver to adjust dynamic error and parallel signal error is proposed.