基于分步无电离层组合的北斗三频长距离参考站间宽巷模糊度解算方法  

Stepwise ionosphere-free wide-lane ambiguity method for long-range base stations with BDS triple-frequency observation

作　　者：高旺[1] 高成发[1] 潘树国[2] 乔龙雷 赵庆[1] 

机构地区：[1]东南大学交通学院,南京210096 [2]东南大学仪器科学与工程学院,南京210096

出　　处：《东南大学学报（自然科学版）》2017年第1期43-49,共7页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(41574026);中央高校基本科研业务费专项资金资助项目(KYLX15_0159);东南大学优秀博士学位论文培育基金资助项目(YBJJ1635)

摘　　要：针对北斗三频长距离参考站间宽巷(含超宽巷)模糊度解算中存在的问题,分析了影响宽巷组合(WLC)法、载波伪距组合的无几何无电离层(GIF)法及分步无几何(TCAR)法的主要因素及各自的局限性.在此基础上,基于参考站间基线已知的特性,提出了一种分步解算的无电离层(SIF)方法.首先采用载波伪距组合求解(0,-1,1)超宽巷模糊度,利用模糊度已固定的(0,-1,1)载波观测值与第2个宽巷/超宽巷观测值组成载波无电离层组合,同时分析了残余几何项误差对模糊度解算的影响.最后采用了一组长度为265 km的实测北斗三频基线数据进行了实验验证.实验结果表明,所提SIF方法能够有效消除长基线情况下电离层延迟的影响,同时受观测值噪声的影响较小.Aiming at the triple-frequency wide-lane/extra-wide-lane ambiguity resolution for longrange base stations of Beidou navigation satellite system(BDS),the main factors and limitations were analyzed for wide-lane combination(W LC)method,the carrier and pseudorange combined geometry-free and ionosphere-free(GIF)method,the three-carrier ambiguity resolution(TCAR)method.Then,a new stepwise ionosphere-free(SIF)method was proposed based on the characteristics known by baseline components.First,the(0,-1,1)ambiguity could be solved reliably with single epoch.After that,in order to solve the second wide-lane ambiguity,the ambiguity-fixed(0,-1,1)observation was used to form a ionosphere-free carrier observation together with the second wide-lane combination.The effects on the residual geometry errors were analyzed.BDS triple-frequency baseline data with a real distance of265km were used to test the performance.The results indicate that the proposed SIF method can avoid the influence of ionosphere delay on long-range baselines with smaller observation noises.

关 键 词：北斗 三频 宽巷模糊度 长基线 电离层延迟 

分 类 号：P228.[天文地球—大地测量学与测量工程]