中长基线的BDS三频线性组合观测量优化

发布时间：2018-02-11 16:43

本文关键词： BDS TCAR RTK 模糊度解算几何无关组合电离层无关组合　出处：《武汉大学学报(信息科学版)》2017年12期 　论文类型：期刊论文

【摘要】：基于几何无关(geometry-free,GF)和电离层无关(ionosphere-free,IF)的三频原始载波线性组合观测量,由于消除了一阶电离层延迟项以及同卫星与测站间几何距离相关误差项的影响,可有效应用于中长基线模糊度解算。对适用于北斗卫星导航系统(BDS)中长基线模糊度解算的GF和IF线性组合观测量进行了研究和优化,通过对载波观测量与伪距观测量组合,得到噪声最小且基于GF和IF的宽巷组合观测量,然后将模糊度得到固定的两个载波组合观测量与原始载波观测量进行最优线性组合,得到具有最低噪声的基于GF和IF的窄巷组合观测量。该方法充分利用了所有载波及伪距观测量信息,并根据其噪声水平进行了加权优化,公式推导具有普遍性和代表性。通过三频实测基线数据进行了论证分析。结果表明,经过一段时间的平滑之后,宽巷和窄巷模糊度浮点解的偏差能收敛到0.5周以内,从而实现模糊度的快速准确固定。
[Abstract]:The linear combination of three frequency carrier based on geometric free free GF( GF) and ionospheric ionosphere-free ionization (IFF) can eliminate the influence of the first order ionospheric delay term and the geometric distance related error term between the same satellite and the observation station, the first order ionospheric delay term and the geometric distance between the same satellite and the station are eliminated. It can be used to calculate the ambiguity of medium and long baseline effectively. The GF and if linear combined observations, which are suitable for the calculation of ambiguity of medium and long baseline in Beidou Satellite Navigation system (BDS), are studied and optimized. The carrier observations and pseudo-range observations are combined. The minimum noise and the combination of GF and if are obtained. Then the ambiguity of the two carrier combination observations with the original carrier observations is optimized and linearly combined. The combined observation of narrow lane based on GF and if with the lowest noise is obtained. The method makes full use of all carrier and pseudo-range observation information, and makes weighted optimization according to its noise level. The formula derivation is universal and representative. It is proved and analyzed by the measured baseline data of three frequencies. The results show that after a period of smoothing, the deviation of the floating point solution of ambiguity in wide and narrow lanes can converge to less than 0.5 weeks. Thus the ambiguity is fixed quickly and accurately.
【作者单位】：信息工程大学导航与空天目标工程学院;
【分类号】：TN967.1

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