摘要
准确探测微小周跳历元是周跳修复的关键,精准修复周跳是高质量北斗卫星导航系统(Bei Dou Navigation Satellite System,BDS)定位的难点,为此提出一种基于多分辨奇异值分解(Multi-Resolution Singular Value decomposition,MRSVD)的敏感分量预测模型,用于周跳探测与修复。该方法对探测信号构造Hankle矩阵,并对其进行MRSVD分析,得到一组具有不同分辨率的分量信号。然后对分量信号进行敏感因子评估分析,选取包含周跳特征的分量,构成敏感特征向量,凸显信号的周跳信息,进而通过模极大值谱精准检测出信号中奇异点的位置,实现对微小周跳的准确探测。以筛选出的MRSVD敏感特征向量为基础,构建最小二乘支持向量机(Least Square Support Vector Machine,LS-SVM)预测模型,进行周跳修复。实验结果表明,该方法能够对载波相位中出现的微小周跳进行准确探测与修复,证明了该方法的可行性和有效性。
It is critical for repairing cycle slips by accurately detecting epochs of small cycle slips,while it is difficult forhigh accuracy Chinese BeiDou Navigation Satellite System(BDS)to precisely repair cycle slips.Thus,a sensitive componentprediction model based on Multi Resolution Singular Value Decomposition(MRSVD)is proposed to detect andrepair cycle slips.In using this method,Hankle matrices are constructed for detected signals,which are analyzed viaMRSVD to obtain a group of component signals.Subsequently,the component signals are evaluated and analyzed fromthe perspective of sensitive factors to select components with characteristics of cycle slips and thereby compose sensitivefeature vectors to highlight information about cycle slips of signals,in order to precisely detect singular points of signalsthrough maximum modulus and accurately detect small cycle slips.At last,sensitive feature vectors are used as trainingsamples to construct a predictive LS-SVM(Least Square Support Vector Machine)model for repairing cycle slips.Experimentalresults suggest that the method proposed in this paper can accurately detect and repair small cycle slips appearingin carrier phases,which prove that this method is feasible and effective.
作者
李越
范玉刚
黄国勇
LI Yue;FAN Yugang;HUANG Guoyong(Faculty of Information Engineering &Automation, Kunming University of Science and Technology, Kunming 650500, China;Engineering Research Center for Mineral Pipeline Transportation, Kunming 650500, China)
出处
《计算机工程与应用》
CSCD
北大核心
2017年第7期220-224,247,共6页
Computer Engineering and Applications
基金
国家自然科学基金(No.51169007)
云南省科技计划项目(No.2013CA022
No.2012DA005
No.2011DH034)
云南省中青年学术和技术带头人后备人才培养计划项目(No.2011CI017)
