| 摘要: |
| 差分卫导实时动态定位(RTK)的定位精度取决于载波相位整周模糊度固定算法的成功率。LAMBDA(Least-Squares Ambiguity Decorrelation Adjustment)算法作为最有效的模糊度在航固定算法，其效能易受卫星故障、多径效应等因素的影响。为提高LAMBDA算法的成功率，引入部分模糊度固定技术。改进后的RTK定位算法以模糊度方差值为序，逐步剔除具有相对最大方差的模糊度并利用LAMBDA算法固定剩余的模糊度，直至模糊度固定成功。双动运动平台实测结果表明，改进后的RTK定位的模糊度固定成功率达到100%，其中首次固定成功率达到98.3%。与导航领域公认的事后处理软件定位结果相比，改进后的RTK定位精度达到厘米级。 |
| 关键词: 差分卫导 实时动态定位 部分模糊度固定 模糊度固定率 首次固定率 |
| DOI： |
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| 基金项目: |
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| An improved RTK positioning algorithm based on partial ambiguity fixing |
| XIONG Jie,MA Yong |
| (Southwest China Institute of Electronic Technology,Chengdu 610036,China;Chengdu Spaceon Observation and Control Technology Co.,Ltd.,Chengdu 611731,China) |
| Abstract: |
| The positioning accuracy of Differential Global Navigation Satellite System(DGNSS) Real Time Kinematic(RTK) technology depends on the success rate of the carrier phase integer ambiguity resolution algorithm.The Least-Squares Ambiguity Decorrelation Adjustment(LAMBDA) algorithm is regarded as the most effective algorithm for realizing ambiguity resolution on the fly,whereas its efficiency is extremely affected by satellite faults,multipath effects,etc.To improve the success rate of the LAMBDA algorithm,the partial ambiguity fixing technology is introduced into the RTK technology.The improved RTK positioning algorithm ranks ambiguities by their covariances,then removes the ambiguity with the relatively maximum covariance and fixes the ambiguity subset by using the LAMBDA algorithm,until the ambiguity subset is successfully resolved.The results of double motion platforms test show that the improved RTK positioning algorithm enhances the success rate up to 100%,in which the first fixed rate is 98.3%.Compared with the positioning results computed by the acknowledged post-processing software,the accuracy of the improved RTK positioning algorithm achieves centimeter level. |
| Key words: differential global navigation satellite system(DGNSS) real time kinematic(RTK)positioning partial ambiguity fixing ambiguity fix rate first fixed rate |
《电讯技术》编辑部 