期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
单历元多频最优消电离层组合集选取研究 被引量:2
1
作者 赵祥伟 刘志平 《大地测量与地球动力学》 CSCD 北大核心 2016年第4期313-318,共6页
探讨利用双观测值的3种消电离层组合方式,并列出双频和三频模式下的所有消电离层组合观测值。在此基础上,以定位中误差和整周模糊度中误差作为评价指标,提出最优消电离层组合集的选取方法。计算表明,双频模式下16个独立组合集效果均等价... 探讨利用双观测值的3种消电离层组合方式,并列出双频和三频模式下的所有消电离层组合观测值。在此基础上,以定位中误差和整周模糊度中误差作为评价指标,提出最优消电离层组合集的选取方法。计算表明,双频模式下16个独立组合集效果均等价,且在高于0.02m伪距噪声的情况下无法获得单历元双差模糊度固定解;三频模式下2 196个独立组合集效果存在显著差异,最优组合集在不高于0.6m伪距噪声的情况下可获得单历元双差模糊度固定解。并且,所选最优组合集优于TCAR/CIR和矩阵变换法的结果。 展开更多
关键词 GNSS 模糊度降相关 评价指标 消电离层组合 最优组合集
下载PDF
Optimal choice of parameters for particle swarm optimization 被引量:14
2
作者 张丽平 俞欢军 胡上序 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2005年第6期528-534,共7页
The constriction factor method (CFM) is a new variation of the basic particle swarm optimization (PSO), which has relatively better convergent nature. The effects of the major parameters on CFM were systematically inv... The constriction factor method (CFM) is a new variation of the basic particle swarm optimization (PSO), which has relatively better convergent nature. The effects of the major parameters on CFM were systematically investigated based on some benchmark functions. The constriction factor, velocity constraint, and population size all have significant impact on the per- formance of CFM for PSO. The constriction factor and velocity constraint have optimal values in practical application, and im- proper choice of these factors will lead to bad results. Increasing population size can improve the solution quality, although the computing time will be longer. The characteristics of CFM parameters are described and guidelines for determining parameter values are given in this paper. 展开更多
关键词 Particle swarm optimization (PSO) Constriction factor method (CFM) Parameter selection
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部