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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >BeiDou Geostationary Satellite Code Bias Modeling Using Fengyun-3C Onboard Measurements
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BeiDou Geostationary Satellite Code Bias Modeling Using Fengyun-3C Onboard Measurements

机译：利用Funyun-3C机载测量对北斗地球同步卫星代码偏差建模

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摘要

This study validated and investigated elevation- and frequency-dependent systematic biases observed in ground-based code measurements of the Chinese BeiDou navigation satellite system, using the onboard BeiDou code measurement data from the Chinese meteorological satellite Fengyun-3C. Particularly for geostationary earth orbit satellites, sky-view coverage can be achieved over the entire elevation and azimuth angle ranges with the available onboard tracking data, which is more favorable to modeling code biases. Apart from the BeiDou-satellite-induced biases, the onboard BeiDou code multipath effects also indicate pronounced near-field systematic biases that depend only on signal frequency and the line-of-sight directions. To correct these biases, we developed a proposed code correction model by estimating the BeiDou-satellite-induced biases as linear piece-wise functions in different satellite groups and the near-field systematic biases in a grid approach. To validate the code bias model, we carried out orbit determination using single-frequency BeiDou data with and without code bias corrections applied. Orbit precision statistics indicate that those code biases can seriously degrade single-frequency orbit determination. After the correction model was applied, the orbit position errors, 3D root mean square, were reduced from 150.6 to 56.3 cm.
机译：这项研究使用来自中国气象卫星风云3C的机载北斗码测量数据，验证并研究了在中国北斗导航卫星系统地基测量中观测到的与仰角和频率有关的系统偏差。特别是对于地球静止地球轨道卫星，利用机载跟踪数据，可以在整个仰角和方位角范围内实现天空视野的覆盖，这更有利于对代码偏差进行建模。除了北斗卫星引起的偏差外，板载北斗码多径效应还表明明显的近场系统偏差，其仅取决于信号频率和视线方向。为了纠正这些偏差，我们通过将北斗卫星引起的偏差估计为不同卫星组中的线性分段函数以及网格方法中的近场系统偏差，从而开发了建议的代码校正模型。为了验证代码偏差模型，我们使用单频北斗数据在有无代码偏差校正的情况下进行了轨道确定。轨道精度统计数据表明，这些代码偏差会严重降低单频轨道确定能力。应用校正模型后，轨道位置误差（3D均方根）从150.6厘米减少到56.3厘米。

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