实时周跳探测与修复的MGF周跳解算方法的改进  

Improvement of calculating method of MGF cycleslip detection and repair in real time

作　　者：申运炎 李克昭[1] 杨梦瑶 焦迎香 田晨冬 王凯[1] 岳哲 SHEN Yunyan;LI Kezhao;YANG Mengyao;JIAO Yingxiang;TIAN Chendong;WANG Kai;YUE Zhe(Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]河南理工大学,河南焦作454000

出　　处：《测绘工程》2024年第3期14-25,共12页Engineering of Surveying and Mapping

基　　金：国家自然科学基金资助项目(41774039)。

摘　　要：周跳的探测和修复是基于载波相位高精度定位的关键技术之一。基于改进的几何无关相位组合MGF方法具有直接分离不同频率上的周跳,对高频数据中较小的周跳实现有效探测,探测速度远快于TurboEdit法等优点。但MGF法无法探测4周以上的周跳,并对低采样率和低卫星高度角下的数据进行周跳探测时,会选取错误的周跳备选值作为周跳检验量从而造成周跳的误判。针对MGF法所存在的问题,通过联合相位减伪距法PRP法,构建新的周跳备选值判断方程,并对MGF法的周跳检验量进行二次历元间差分STMGF,组成PRP-STMGF周跳探测组合。PRP-STMGF周跳探测组合能够探测任意周的周跳,与TurboEdit法相比,修复时无需分离周跳,直接对PRP-STMGF法的周跳检验量进行四舍五入即可确定出正确的周跳值,且适用于低采样率和低卫星高度角下的实时周跳探测与修复。最后通过北斗双频实测数据进行实验验证,结果表明,PRP-STMGF周跳探测组合,避免了MGF法选取错误周跳备选值的问题,相较于TurboEdit法不仅低延时,准确率高,且适用于不同采样率和低卫星高度角下周跳探测与修复。Cycle slip detection and repair is one of the key technologies for high precision phase positioning.The modified geometry-free combination(MGF)method has the advantages of directly separating cycle slips on different frequencies,effectively detecting smaller cycle slips in high frequency data,and the detection speed is much faster than TurboEdit method.However,the MGF method cannot determine the cycle slip larger than four cycles.When the cycle slips detection is carried out on the data with low sampling rate and low satellite altitude angle,the wrong alternative cycle slip value will be selected as the cycle slip test quantity,resulting in the misjudgment of cycle slips.In this paper,aiming at the problems existing in MGF method,a new cycle slip alternative value judgment equation was constructed by combining Phase reduction pseudorange method(PRP).The PRP-STMGF cycle slip detection combination was formed by PRP method and Second-order time difference about MGF(STMGF).The PRP-STMGF cycle slip detection combination can detect large cycle slips,compared with TurboEdit method,there is no need to separate the cycle slip during repair,and the correct cycle slip value can be determined by rounding the cycle slip test quantity of PRP-STMGF method directly,and it is suitable for real-time cycle slips detection and repair under low sampling rate and low satellite altitude angle.Finally,the experimental verification was carried out through the Beidou dual-frequency measured data.The results show that the PRP-STMGF cycle slip detection combination avoids the problem of MGF method selecting the wrong cycle slip alternative value.Compared with TurboEdit method,it has low delay,high accuracy,and it is also suitable for slip detection and repair under different sampling rates and low satellite altitude angle.

关 键 词：周跳 改进的几何无关相位组合 相位减伪距法 二次历元间差分 

分 类 号：P228[天文地球—大地测量学与测量工程]