多站精密定位技术研究
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摘要
精密单点定位(PPP)及其模糊度固定技术是当今GNSS领域的研究热点。该技术能够在全球范围内快速获取高精度框架坐标,但存在单点作业的局限性、非差模糊度难以固定及严重依赖高精度卫星轨道和钟差产品等问题。针对模糊度固定问题,研究多个测站情况下的非差精密定位算法及其模糊度固定技术,根据非差模糊度与双差模糊度之间的映射关系,将非差模糊度映射为双差模糊度,并基于LAMBDA算法固定双差模糊度,然后将固定后的双差模糊度作为强约束条件方程,并给其无限权,从而解决多站非差条件下的模糊度固定问题。选取全球35个IGS测站进行多站非差精密定位实验,结果表明算法能够提高定位精度,定位误差约0.01m,最大不超过0.02m。
PPP and its ambiguity fixing technology is a hotspot on GNSS research field. With this technology,highly precise ITRF position coordinates can be attained all over the world.However,there are some disadvantages in PPP such as the problems of the single point limiting factors,undifferenced ambiguity fixing and the depending on high-precision satellite orbit and clock correction products.Aiming at the problem of ambiguity fixing,in this text undifferenced PPP and ambiguity fixing technology have been studied on multi-station conditions.According to the mapping relations between the undifferenced ambiguities and double difference ambiguities,the undifferenced ambiguities are mapped to double difference ambiguities which are fixed by LAMBDA algorithm,and then the constrained condition equations are attained from the fixed double difference ambiguities with infinite weights.Thirty five IGS stations all over the world are selected for precise undifferenced positioning experiment and the results indicate that the positioning precision has been improved to a certain extent on this method.High-precision coordinates of stations can be attained with the positioning error about 0.01 mand the maximum less than 0.02 m.
PPP and its ambiguity fixing technology is a hotspot on GNSS research field. With this technology,highly precise ITRF position coordinates can be attained all over the world.However,there are some disadvantages in PPP such as the problems of the single point limiting factors,undifferenced ambiguity fixing and the depending on high-precision satellite orbit and clock correction products.Aiming at the problem of ambiguity fixing,in this text undifferenced PPP and ambiguity fixing technology have been studied on multi-station conditions.According to the mapping relations between the undifferenced ambiguities and double difference ambiguities,the undifferenced ambiguities are mapped to double difference ambiguities which are fixed by LAMBDA algorithm,and then the constrained condition equations are attained from the fixed double difference ambiguities with infinite weights.Thirty five IGS stations all over the world are selected for precise undifferenced positioning experiment and the results indicate that the positioning precision has been improved to a certain extent on this method.High-precision coordinates of stations can be attained with the positioning error about 0.01 mand the maximum less than 0.02 m.
引文
[1]章红平,高周正,牛小骥,等.GPS非差非组合精密单点定位算法研究[J].武汉大学学报(信息科学版),2013,38(12):1396-1399.
[2]韩保民,欧吉坤.基于GPS非差观测值进行精密单点定位研究[J].武汉大学学报(信息科学版),2003,28(4):409-412.
[3]吴江飞,黄珹.GPS精密单点定位模型及其应用分析[J].大地测量与地球动力学,2008(1):96-100.
[4]周星.精密单点定位技术应用在矿区控制测量的精度分析[J].测绘技术装备,2013,15(4):14-16.
[5]娄俊萍,李文文,陈克杰.不同IGS产品对精密单点定位的影响[J].测绘地理信息,2013,38(4):21-23.
[6]刘精攀,朱亚光.GPS非差相位精密单点定位方法与实现[J].测绘与空间地理信息,2012,35(6):103-107.
[7]邱中军,陈景平,房颖,等.精密单点定位及其精度分析[J].测绘工程,2011,20(6):35-37.
[8]孙洪瑞,沈云中,周泽波.GPS/GLONASS组合点定位模型及其精度分析[J].测绘工程,2009,18(1):8-10.
[9] ZUMBERGEJ F,HEFLIN M B,JEFFERSON D C,et al.Precise Point Positioning for the Efficient and Robust Analysis of GPS Data from Large Networks.Journal of Geophysical Research,1997,102(B3):5005-5017.
[10]HATCH R.Satellite Navigation Accuracy:Past,Present and Future.Proceeding of the 8th GNSS Workshop,Korea,2001.
[11]BLEWITT G.An Automatic Editing Algorithm for GPS Data.Geophysical Research Letters,1990,17(3):199-202.
[2]韩保民,欧吉坤.基于GPS非差观测值进行精密单点定位研究[J].武汉大学学报(信息科学版),2003,28(4):409-412.
[3]吴江飞,黄珹.GPS精密单点定位模型及其应用分析[J].大地测量与地球动力学,2008(1):96-100.
[4]周星.精密单点定位技术应用在矿区控制测量的精度分析[J].测绘技术装备,2013,15(4):14-16.
[5]娄俊萍,李文文,陈克杰.不同IGS产品对精密单点定位的影响[J].测绘地理信息,2013,38(4):21-23.
[6]刘精攀,朱亚光.GPS非差相位精密单点定位方法与实现[J].测绘与空间地理信息,2012,35(6):103-107.
[7]邱中军,陈景平,房颖,等.精密单点定位及其精度分析[J].测绘工程,2011,20(6):35-37.
[8]孙洪瑞,沈云中,周泽波.GPS/GLONASS组合点定位模型及其精度分析[J].测绘工程,2009,18(1):8-10.
[9] ZUMBERGEJ F,HEFLIN M B,JEFFERSON D C,et al.Precise Point Positioning for the Efficient and Robust Analysis of GPS Data from Large Networks.Journal of Geophysical Research,1997,102(B3):5005-5017.
[10]HATCH R.Satellite Navigation Accuracy:Past,Present and Future.Proceeding of the 8th GNSS Workshop,Korea,2001.
[11]BLEWITT G.An Automatic Editing Algorithm for GPS Data.Geophysical Research Letters,1990,17(3):199-202.