BDS小周跳的探测与修复方法

Detection and Repair of BDS Small Cycle Slips

北斗卫星导航系统(BDS)在亚洲地区的导航定位中已得到越来越多的应用。针对载波相位观测值的小周跳难于探测的问题,在北斗三频载波和MW组合的基础上,本文提出了一种基于超长波长的无电离层影响的载波相位组合探测法,并结合电离层离析方程组探测载波相位观测值中发生的各种组合小周跳,有效地减少了周跳探测的误判和漏判。针对小周跳的修复,在空间邻域搜索法的基础上,增加了双像对比法和电离层离析法,有效地提高了周跳修复的准确性和正确性。对MEO卫星、GEO卫星和IGSO卫星在采样间隔1、5和30 s下的载波相位观测数据进行检验,表明该周跳探测与修复方法可行且有效,可以实时探测出较大采样间隔下的所有周跳,并准确修复载波相位观测值。

Bei Dou Navigation Satellite System is more and more applicated in the navigation and positioning around Asian area.On the basis of BDS tri-frequency carrier and the combination of MW,a carrier-phase combination detection method based on ultra-long wave without ionospheric effect is proposed,combined with the ionospheric segregation equations to detect the various combinations of small cycle slips in the carrier phase observations,which reduce the error and misjudgment of cycle slips detection effectively.In order to repair small cycle slips,on the basis of the spatial domain search method,the double image contrast method and the ionospheric segregation method are added,which improve the accuracy and correctness of the cycle repair effectively.The carrier phase observation data of MEO satellites,GEO satellites and IGSO satellites at sampling intervals 1,5 and 30 s are tested,which show that the cycle slip detection and repair method is feasible and effective,and all cycle slips under larger sampling interval can be detected and repaired accurately.