Application of Elevation Based Multipath Correction Model in BDS Relative Positioning
-
摘要: 伪距观测值的精度对相对定位解算的收敛速度有很大影响。相关研究发现BDS伪距观测值中存在与高度角相关的多路径偏差,严重降低了伪距观测值的精度。通过EMD滤波和多项式拟合建立基于高度角的多路径改正模型对这类误差进行消除。实验结果表明,基于高度角的多路径改正模型可以有效提高伪距观测值精度,加快相对定位结果收敛速度,改正后四个时段的2 h定位结果精度分别提高了64.1%、43.9%、35.3%、66.0%。Abstract: The accuracy of pseudorange observation has a great impact on the rate of relative positioning solution convergence.Related research found the exist of multipath deviation in the BDS pseudorange observation,which is associated with evelation angle and severely reduces the pseudorange observation precision.By the EMD filter and polynomial fitting we established a multipath correction model based on elevation angle to eliminate this kind of error.Experimental results show that the multipath correction model based on elevation angle can effectively improve the accuracy of pseudorange observation, and speed up the rate of relative positioning results convergence.After correction the precision of four times 2 h positioning results increased by 64.1%, 43.9%, 35.3% and 43.9% respectively.
-
Key words:
- BDS /
- relative positioning /
- EMD filter /
- multipath deviation /
- elevation angle
-
[1] WANNINGER L,BEER S.BeiDou satellite induced code pseudorange variationsdiagnosis and therapy[J].GPS Solution, 2015,19:639-648. [2] 王敏,柴洪洲,刘鸣,等.一种顾及GEO卫星多路径效应影响的BDS长距离相对定位方法[J].测绘科学技术学报,2016, 33(2):122-126. [3] 王广兴,赵齐乐,戴志强,等.陆态网络数据的北斗观测值特性分析[J].测绘科学,2016,41(1):33-38. [4] 李昕,曾琪,管守奎,等.北斗卫星伪距多路径偏差改正研究[J].大地测量与地球动力学,2016,36(8):728-731. [5] ZHANG X H,HE X Y,LIU W K.Characteristics of systematic errors in the BDS [J].GPS Solution,2016,1: 1-13. [6] GUO F,LI X,LIU W K.Mitigating BeiDou satelliteinduced code bias:Taking into account the stochastic model of correction[J]. Sensors, 2016, 16(6):909. [7] LOU Y D,GONG X P,et al. gpssAssessment of code bias variations signals and impacts on ambiguity resolution[J].GPS Solution,2016:1-10. [8] 魏子卿,葛茂荣.GPS相对定位的数学模型[M].北京:测绘出版社,1998. [9] LEICK A.GPS Satellite Surveying[M].Hoboken:John Wiley&Sons,Inc,2004. [10] 陈明,张鹏,孙占义,等.GPS多路径误差分析及探测方法[J].测绘工程,2011,20(5):29-32. [11] GE L L,HAN S W,RIZOS C,HATANAKA Y.GPS multipath change detection in permanent GPS stations[J].Survey Review,2002,36(283):306-322. [12] HUANG S X,LI P H,YANG B C,et al.Study on the Characteristics of multipath effects in GPS dynamic deformation monitoring[J].Geomatics and Information Science of Wuhan,University,2005,30(10):877-880. [13] 刘立龙,封海洋,陈保清,等.GPS与北斗多路径效应对比研究[J].城市勘测,2016(1):5-10. [14] BENESTY P J,CHEN J,HUANG Y,et al.Noise reduction in speech processing[M]. Springer Berlin Heidelberg,2009:1-4. [15] 戴吾蛟,丁晓利,朱建军,等.基于经验模式分解的滤波去噪法及其在GPS多路径效应中的应用[J].测绘学报,2006,35(4):321-327.
点击查看大图
计量
- 文章访问数: 303
- HTML全文浏览量: 30
- PDF下载量: 70
- 被引次数: 0