星载GPS非差运动学定轨中的观测数据加权策略研究

发布时间：2018-06-10 06:20

本文选题：星载GPS + 非差　；参考：《计算机工程与科学》2011年05期

【摘要】：星载GPS非差运动学定轨结果容易受到观测数据质量的影响,相位观测噪声远远小于伪码,如果将两种观测数据等权处理,会降低相位信息在参数解算中的作用;相位观测存在模糊,单独使用会导致参数估计结构不稳定;伪码观测噪声与接收天线高度角存在很强的相关性。本文根据星载GPS伪码和相位联合非差运动学定轨原理,结合GPS观测数据质量分析结果,提出了一种合理的加权策略,提高了星载GPS非差运动学定轨的精度和稳定性。对一个星期的CHAMP的观测数据进行处理,将非差运动学定轨结果与GFZ事后科学轨道进行对比,结果表明二者在R、T、N分量上差值的均方根为20cm、12cm、13cm,三维点位误差的均方根为27cm。通过分析多种不同加权策略的定轨精度差异,验证了本文提出的加权策略的有效性。
[Abstract]:The result of the satellite borne GPS non differential kinematics is easily affected by the quality of the observed data, and the phase observation noise is far less than the pseudo code. If the two kinds of observational data are processed, the function of the phase information in the parameter calculation will be reduced; the phase observation is blurred, and the structure of the parameter estimation is unstable by the single use, and the pseudo code observation noise is used. There is a strong correlation between the receiving antenna height angle. In this paper, based on the principle of spaceborne GPS pseudo code and phase joint non differential kinematics, combining with the results of GPS observation data quality analysis, a reasonable weighting strategy is proposed to improve the accuracy and stability of the spaceborne GPS non differential kinematic fixed orbit determination. The observation data of CHAMP for a week are carried out. The results show that the root mean square of the difference between the two R, T, and N components is 20cm, 12cm, 13cm, and the root mean square of the three-dimension point error is the difference between the fixed orbit accuracy of a variety of different weighting strategies, which verifies the validity of the weighted strategy proposed in this paper.
【作者单位】：国防科学技术大学理学院;
【基金】：国防预研基金项目(9140A22040508KG01) 航天支撑技术基金项目(2006-HT-GFKD)
【分类号】：P139

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