基于改进型最小二乘搜索的GNSS姿态测量方法  

Method based on improved least squares search for GNSS attitude measurement

作　　者：李世杰[1] 李治安[1] 庞春雷[1] 刘明[1] 

机构地区：[1]空军工程大学信息与导航学院,陕西西安710077

出　　处：《重庆邮电大学学报（自然科学版）》2016年第2期187-193,共7页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金资助项目(61273049)~~

摘　　要：结合全球卫星导航系统(global navigation satellite system,GNSS)用于姿态测量具有基线已知的特点,提出了一种改进型最小二乘搜索算法:将整周模糊度分为基本组和剩余组,在伪距精度和基线长度约束条件下确定出基本模糊度组的搜索空间;然后根据模糊度与基线俯仰角、航向角的关系,并以俯仰、航向角度组合作为联系基本组和剩余组的中间变量,通过搜索基本模糊度组来确定出剩余模糊度组合;最后利用最小二乘解算基线矢量,在二次残差比值检验条件下,完成整周模糊度的固定及姿态解算。实验结果表明,改进算法不仅有效减小了模糊度的搜索空间,而且缩短了模糊度初始化时间,具有较高的测姿精度,适用于GNSS姿态测量。Based on the feature that the baseline is known in the attitude measurement of Global Navigation Satellite System（ GNSS）,an improved least squares search method is proposed in the following procedures： First,the integer ambiguity group is divided into basic group and remaining group. Given the pseudo range accuracy and baseline length,the search space for basic group is deduced. Then the remaining group could be constructed from the basic group,based on the relations between ambiguity and baseline heading and elevation. In this process,the heading and elevation was regarded as the intermediate variable. Finally,the baseline vector is calculated by least squares method. By comparing two-order residuals of baseline,integer ambiguity can be defined and therefore the attitude measurement is completed. The experiment result reveals that this improved method can effectively reduce the size of search space and the initialization time. The method is with a relatively high precision,meeting the demand for GNSS attitude measurement.

关 键 词：全球卫星导航系统 最小二乘搜索 整周模糊度 姿态测量 基线约束 

分 类 号：TN967.1[电子电信—信号与信息处理]