基于宽巷组合模型求解整周模糊度的研究
2016-04-26徐冠楠
徐冠楠,汪 捷
(海军工程大学,湖北 武汉 430033)
基于宽巷组合模型求解整周模糊度的研究
徐冠楠,汪捷
(海军工程大学,湖北 武汉 430033)
摘要传统的最小二乘降相关法(LAMBDA)在求解模糊度时,通常会因观测历元较少而出现法方程秩亏的现象,导致无法成功求解模糊度。针对此问题,提出利用双频宽巷的线性组合观测模型解算模糊度。同时,研究了观测量误差均方差值和OVT检验历元个数对模糊度解算的影响。结果表明,整周模糊度解算成功率受伪距双差观测误差均方差值的变化影响较大,模糊度解算成功率随着检验历元个数增加而增大。
关键词LAMBDA法;整周模糊度;双频宽巷;误差均方差;OVT检验
Research on Integer Ambiguity Resolution Based on Wide Lane Combination Observation Model
XU Guan-nan,WANG Jie
(NavalUniversityofEngineering,WuhanHubei430033,China)
AbstractDue to the less number of observation epochs,traditional least-square decorrelation method(LAMBDA)always has a problem of normal equation rank-defect,which leads to unsuccessful ambiguity resolution.To solve this problem,a method of using linear combination of dual-frequency wide lane observation model is proposed for ambiguity resolution.At the same time,the impact of observation error mean square deviation value and the number of OVT inspection epochs on ambiguity resolution is studied.The results show that the success rate of ambiguity resolution is determined by the variation of pseudo range double-difference observation error mean square deviation.As a result,the success rate of ambiguity resolution increases with the increasing of inspection epoch number.
Key wordsLAMBDA;integer ambiguity;double-frequency wide lane;error mean square deviation;OVT inspection
0引言
高精度动动相对定位是GNSS定位领域的重点和难点问题[1]。以载波相位为观测量,关键就是动态整周模糊度的确定。根据动态站接收机对卫星载波相位的观测,与基准站观测数据一起通过模糊度解算技术便可以确定整周模糊度,进而求解动态载体相对于基准站的实时位置。在载体运动过程中,卫星信号一旦失锁,动态站不再需要停下来进行初始化工作,即可以完成整周模糊度的确定[2]。影响高精度相对定位的因素很多,其中最主要的是整周模糊度解的可靠性。基于传统双频的观测模型[3-4],本文提出了基于宽巷组合的分步求解模糊度的方法,在此基础上,创造性地对某些组合模型观测量对模糊度解算成功率的影响做了定量研究和分析,通过分析结果对影响因素进行改进可以有效地提高模糊度解算的成功率。……
