高频GNSS数据MGF周跳解算方法的质量控制

Quality Control for MGF Cycle Slip Determination of High-Sampling-Rate GNSS Data

针对全球导航卫星系统(global navigation satellite system,GNSS)高频数据周跳的高可靠性快速探测与修复,基于改进的相位几何无关(modified geometry-free,MGF)组合量,提出了MGF周跳解算的质量控制方法,以进一步提高周跳修复的成功率。根据MGF组合观测量及误差特征,推导了其周跳修复的边界条件,并分析了不同导航卫星系统MGF方法的适用性,及观测噪声对周跳解算结果的影响。在此基础上,构建了MGF组合的质量控制检验量,经多系统GNSS实测数据试验分析,结果表明:MGF方法能够对小周跳(如小于5周的周跳)实现快速探测,修复成功率可达到99.90%以上;利用MGF组合的质量控制检验量能够分别识别出GPS、BDS和GLONASS中100%、87.57%和77.42%的错误周跳解算结果,使得MGF周跳解算错误率降低至0.01%。MGF方法受相位噪声影响显著,MGF组合的质量控制检验量能够有效识别错误的周跳解算结果,从而提高周跳修复成功率,但随着相位几何无关组合量噪声水平的增加,MGF质量控制检验量对于周跳修复错误和观测噪声的区分性降低。

Objectives:For the high-reliability and fast cycle slip detection and correction of high-sampling-rate global navigation satellite system(GNSS)data,the quality control method for modified geometry-free(MGF)combination is proposed to improve the success rate of phase cycle slip correction.Methods:According to the MGF combination and its error characteristics,the error limits of the MGF method are derived,and the applicability in different navigation satellite systems and the influence of measurement noise on the detecting results are analyzed.Based on the above research,the quality control test of the MGF combination is constructed and multi-GNSS experiments are carried out.Results:The experimental results show that the MGF method can be used to detect and correct small cycle slips(such as cycles below 5)rapidly with an accuracy rate of 99.90%.Besides,the quality control test of the MGF combination can identify 100%,87.57%and 77.42%of the wrong correcting results of GPS,BDS and GLONASS respectively,which reduces the error rate of cycle slip correction to 0.01%.Conclusions:The MGF method is significantly influenced by the noise of phase observation,and the quality control test can identify wrong correcting results effectively,thereby improving the success rate of cycle slip correction.The ability of the quality control test to distinguish wrong detecting results and noise decreases with the increase of noise level.