GPS/GLONASS周跳探测与修复方法

GPS/GLONASS Cycle Slip Detection and Repair Method

为了准确地探测和确定GPS/GLONASS周跳并且提高小周跳探测和修复的能力,综合电离层残差法和相位减伪距法,提出了一种新的GPS/GLONASS周跳探测和确定方案:采用电离层残差法探测出周跳;由相位减伪距法确定周跳数的搜索范围;根据搜索范围组合出所有周跳数的候选值;最后,由电离层残差法检验量与其观测噪声最为接近的候选值为最佳的周跳值。采用该方案对江苏CORS和青岛CORS部分基准站观测数据进行处理分析。结果表明:该方法具备探测和确定小周跳的能力,其搜索的成功率在95%,探测分辨率可以达到0.03周,且修复精度可以达到±0.031周。

In order to accurately detect and determine the GPS/GLONASS cycle slip, especially small cycle slip, a new GPS/GLONASS cycle slip detection and identification program was proposed based on ionosphere residual method combined with phase minus pseudo range method. Firstly, the GPS/GLONASS cycle slip was detected by ionosphere residual method. Secondly, the search scope of cycle slip was fixed by phase minus pseudo range. Then, all candidate values were searched according the scope of cycle slip. At last, the optimal value of cycle slip was determined by the ionosphere residual value closet to observation noise. The GPS/GLONASS observations of parts of Jiangsu CORS and Qingdao CORS were processed by the method. It was showed that the method had the a- bility of detecting and fixing small cycle slip, and that the search success ratio, detecting resolution and repairing accuracy were 95%, 0.03 cycle and ±0.031 cycle respectively.