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

摘要

Many carrier phase combinations with good characteristics can be got in BDS triple‐frequency , w hich improves the effect of cycle slip detection and repair base on undifferenced observation .T his paper presents a model for cycle slip detection and repair base on BDS triple‐frequency undifferenced observation . Firstly ,the HM W combination is used for EWL cycle slip detection and repair , then , geometry‐free carrier phase combination with the repaired EWL and WL can be used to estimate WL cycle slip with neglecting the ionospheric delay .Finally ,ionospheric delay variation can be updated by optimal carrier phase combinations ,then ,cycle slip in NL can be estimated by new geometry‐free combination formed by the cycle‐slip‐fixed WL observation and NL observation . At last , cycle slips in original carrier phase observations can be estimated by simple transformation .Then the feasibility of the model is verified with the measured data , and the result show s that the model is feasible even in the condition of active ionospheric disturbance .%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30 s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。