| BDS／GPS中长基线宽巷准厘米级RTK算法 |
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| 引用本文： | 高春伟,赵利江,刘海红.BDS／GPS中长基线宽巷准厘米级RTK算法[J].全球定位系统,2019,44(2):54-58. |
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| 作者姓名： | 高春伟 赵利江 刘海红 |
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| 作者单位： | 1.青海省基础测绘院,青海 西宁 810000 |
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| 摘 要： | 针对常规实时动态（RTK）定位技术中长基线初始化时间较长、定位结果不稳定的问题，提出了一种基于部分模糊度固定策略的BDS/GPS宽巷卡尔曼滤波RTK定位方法，从充分发挥宽巷观测值波长较长和宽巷模糊度易于固定的优势，避免低高度角卫星对模糊度解算的影响，从而提高中长基线情况下的模糊度固定率. 同时采用附加宽巷模糊度参数的卡尔曼滤波方法计算浮点解，以固定高于设置模糊度解算截止高度角的卫星进行定位，并解算电离层活动较剧烈的25~76 km的中长基线. 通过3组试验，结果表明，BDS/GPS双系统联合定位宽巷模糊度固定率均接近100%，76 km基线模糊度固定率达到99.9%，定位精度达到厘米级或准厘米级.
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| 关 键 词： | 中长基线 宽巷 部分模糊度固定 卡尔曼滤波 |
BDS／GPS medium-long baseline quasi-centimeter RTK algorithm |
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| Affiliation: | 1.Qinghai Institute of Basic Surveying and Mapping, Xining 810000,China2.Qinghai Institute of Geography and National Conditions, Xining 810000,China. |
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| Abstract: | Aiming at the problem of long baseline initialization time and unstable positioning results in conventional real-time dynamic (RTK) positioning technology, a BDS/GPS wide lane Kalman filter RTK positioning method based on partial ambiguity fixing strategy is proposed, which can make full use of the advantages of long observation wavelength and easy fixing ambiguity of wide lane, and avoid the influence of low altitude angle satellite on ambiguity resolution. At the same time, Kalman filter method with additional wide lane ambiguity parameters is used to calculate floating-point solution to fix the position of satellites higher than the cut-off altitude angle of ambiguity solution, and to calculate the mid-long baseline of 25-76 km with intense ionospheric activity. Through three groups of experiments, the results show that: BDS/GPS dual system locates wide lane ambiguity jointly. The degree fixing rate is close to 100%, the baseline ambiguity fixing rate of 76 km is 99.9%, and the positioning accuracy is centimeter or quasi-centimeter. |
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