一种改进的基于BDS三频非差观测的周跳实时探测与修复模型

发布时间：2018-11-23 16:13

【摘要】：BDS三频观测条件下可以组合得到具有优良特性的虚拟载波观测量,有利于改善非差观测数据的周跳实时探测与修复。文中提出一种基于BDS三频非差数据的周跳实时探测与修复模型:首先,采用消电离层无几何HMW组合观测量探测和修复EWL周跳;然后,将经过修复的EWL观测量与WL组合消除几何相关项,忽略电离层延迟残差进而确定WL周跳;最后采用经过修复的WL观测量与NL组合形成无几何观测量,并通过优化载波相位组合确定电离层延迟的变化量以探测和计算NL周跳,并通过简单变换得到原始载波观测量的周跳值。通过实测BDS三频数据对模型可行性进行验证分析,结果表明,即使在30s的采样率以及电离层活动活跃条件下,该模型都可有效实时探测和修复各类周跳。
[Abstract]:Under the condition of BDS three-frequency observation, the virtual carrier observations with excellent characteristics can be obtained, which is helpful to improve the real-time detection and repair of cycle slips of non-differential observation data. In this paper, a real-time cycle slip detection and repair model based on BDS three-frequency non-difference data is proposed. Firstly, the EWL cycle slip is detected and repaired by using the ionospheric non-geometric HMW combined observations. Then, the repaired EWL observations and WL are combined to eliminate the geometric correlation terms, and the ionospheric delay residuals are ignored to determine the WL cycle slip. Finally, the repaired WL observations are combined with the NL to form a non-geometric observation, and the variation of ionospheric delay is determined by optimizing the carrier phase combination to detect and calculate the NL cycle slip. The cycle hops of the original carrier observations are obtained by simple transformation. The feasibility of the model is verified and analyzed by the measured BDS three-frequency data. The results show that the model can effectively detect and repair all kinds of cycle slips in real time even under the sampling rate of 30s and the active condition of ionospheric activity.
【作者单位】：信息工程大学地理空间信息学院;西安测绘总站;信息工程大学导航与空天目标工程学院;
【基金】：国家自然科学基金资助项目(41574010)
【分类号】：P228

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