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GPS/Galileo组合导航的模糊度搜索空间 被引量:3
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作者 赵毅 龚诚 邓宁 《中国空间科学技术》 EI CSCD 北大核心 2011年第2期9-15,共7页
为了组合导航的载波相位模糊度固定,将目前在GPS中常用的模糊度固定方法——最小二乘降相关平差(LAMBDA)法直接应用于GPS/Galileo组合模糊度固定,发现其搜索空间的确定方法并不能很好地适应GPS/Galileo组合中模糊度维数较高的情况。通... 为了组合导航的载波相位模糊度固定,将目前在GPS中常用的模糊度固定方法——最小二乘降相关平差(LAMBDA)法直接应用于GPS/Galileo组合模糊度固定,发现其搜索空间的确定方法并不能很好地适应GPS/Galileo组合中模糊度维数较高的情况。通过对常规LAMBDA搜索空间确定方法的分析比较,在传统方法的基础上提出了一种专门针对高维模糊度固定的搜索空间确定方法——修正法确定模糊度搜索空间。通过对修正法进行仿真试验,证明该方法能保证在GPS/Galileo组合定位模式下实际备选模糊度个数基本与预先设定的备选模糊度个数一致,进而能在不降低模糊度固定成功率的基础上有效提高LAMBDA模糊度固定的搜索效率,其性能优于传统的模糊度搜索空间确定方法。 展开更多
关键词 组合导航 模糊度空间确定 最小二乘降相关平差法 仿真 全球定位系统 伽利略卫星系统
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双频组合观测值解算北斗模糊度的探讨
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作者 陈海岳 汪捷 徐冠楠 《舰船电子工程》 2015年第6期44-46,共3页
针对北斗双频组合方式,基于矩阵变化和迭代过程,以两种不同线性组合的扩波方法,采用一种新的迭代过程,在满足波长较长以及降低模糊度解相关性的条件下,减小了模糊度搜索空间大小,提高了模糊度解算效率和速度。
关键词 北斗双频 线性组合 模糊 模糊度空间
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A Common Fixed Point Theorem for Compatible Mappings of Type (K) in Intuitionistic Fuzzy Metric space
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作者 K.B. Manandhar K. Jha 《Journal of Mathematics and System Science》 2015年第11期474-479,共6页
The purpose of our paper is to obtain a common fixed point theorem for two pairs of self-mappings of compatible of type (K) in a complete intuitionistic fuzzy Metric space with example. Our result generalized and im... The purpose of our paper is to obtain a common fixed point theorem for two pairs of self-mappings of compatible of type (K) in a complete intuitionistic fuzzy Metric space with example. Our result generalized and improves similar other results in literature. 展开更多
关键词 Compatible mappings Compatible mappings of type (K) and common fixed point.
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Determination of the Sets of Sequences with the Standard Fuzzy Metric
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作者 Ugur Kadak 《Journal of Mathematics and System Science》 2013年第5期217-224,共8页
Following George and Veeramani et. al. [On some results in Fuzzy Metric Spaces, Fuzzy Sets Syst. 64 (1994) 395-399], we essentially deal with the classical sequence spaces using of the standard fuzzy metric with t-n... Following George and Veeramani et. al. [On some results in Fuzzy Metric Spaces, Fuzzy Sets Syst. 64 (1994) 395-399], we essentially deal with the classical sequence spaces using of the standard fuzzy metric with t-norm. We consider well-known classical sequence spaces such as l∞ , C, C0 and l p, and we have construct it with standard fuzzy metric. Finally, the completeness of these spaces was given by using the same metric. 展开更多
关键词 Sequence space metric space fuzzy metric space complete metric space.
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Metrics on Noncompact Fuzzy Number Space E^n
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作者 冯玉瑚 《Journal of Donghua University(English Edition)》 EI CAS 2004年第2期83-87,共5页
The theory of metric spaces of fuzzy numbers has been established and found very convenient in many research fields on fuzzy analysis such as fuzzy integrals and differentials, fuzzy differential equations, fuzzy rand... The theory of metric spaces of fuzzy numbers has been established and found very convenient in many research fields on fuzzy analysis such as fuzzy integrals and differentials, fuzzy differential equations, fuzzy random variables and fuzzy stochastic processes etc.. But, a large part of this theory heavily depends on the condition that fuzzy number has to have compact support set and so fails to analyze and apply noncompact fuzzy numbers. The purpose of this paper is to introduce three classes of metrics on noncompact fuzzy number space and to discuss their basic properties, completeness and separability in detail. 展开更多
关键词 Noncompact fuzzy number METRIC COMPLETENESS SEPARABILITY ANALYSIS
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