基于伪距的北斗双星/SINS组合导航系统可观测度分析  

Observable degree analysis of Beidou double-star/SINS integrated navigation system based on pseudo-range

作　　者：李建文[1] 张宗麟[1] 

机构地区：[1]空军工程大学工程学院,西安710038

出　　处：《中国惯性技术学报》2008年第1期73-77,共5页Journal of Chinese Inertial Technology

基　　金：国防科技预先研究项目(51309060302)

摘　　要：在连续的分段式定常系统模型基础上,证明了通过简化分段式定常系统的可观测矩阵来分析其离散化模型可观测性能的可行性;介绍了一种基于奇异值分解的系统状态可观测度分析方法。通过对一个分段间隔的条带化可观测矩阵进行奇异值分解来判断每一个奇异值对应的系统状态及每一个系统状态对应的可观测度;根据北斗双星定位系统的双伪距、高精度原子钟及气压高度信息,建立了北斗双星/SINS伪距组合滤波模型,并将可观测度分析方法应用于该模型中。仿真结果表明:在伪距组合模式下对简化的分段式定常系统可观测矩阵进行奇异值分解的方法能有效反映北斗双星/SINS组合导航系统的可观测程度。On the basis of continuous Piece-Wise Constant System （PWCS） model, the way of simplifying PWCS observable matrix was proved to be feasible in analyzing dispersed PWCS model＇s observable capability. A method of analyzing system states＇ observable degree was introduced based on singular value decomposition. The observability of each state and the correspondences between singular values and state components were judged by decomposing on one subsection of the stripped observable matrix. According to the information of two pseudo-ranges, precise atomic clock and air pressure altitude, the filtering model of Beidou Double-star/SINS pseudo-range integrated navigation system was built, and the observable degree analysis method was used in this model. Simulation results show that the Beidou Double-star/SINS integrated navigation system＇s observable degree can be effectively represented by means of decomposing simplified PWCS observable matrix.

关 键 词：分段式定常系统 伪距 组合导航 可观测度 

分 类 号：U666.1[交通运输工程—船舶及航道工程]