摘要
面向地形轮廓匹配(TERCOM)高程辅助导航,定义了地形独立因子和地形信息熵,详细阐述了地形信息熵的统计特性,提出了不同尺寸地形分块的熵值关系;提供了多项地形参数的数学模型,并运用地形的信噪比、粗糙度、坡度、相关长度以及地形信息熵,对数字高程模型(DEM)地形的导航性能和适配性进行了定性和定量的分析,给出了关系曲线图;通过在模拟地形上统计分析、设定阈值,运用地形信息熵进行了适配区域的选择,并得到了较好的导航性能指标;本文的分析结果可作为建立可导航地形数据库、局部适配区域评估、航线规划的重要依据.
Terrain unaided factor and terrain information entropy are defined for the terrain contour matching （TERCOM） elevation-aided navigation system. Statistical characteristics of terrain information entropy are described, and the entropy relation between terrains of different sizes introduced. Mathematical models of various terrain parameters are presented, including SNR, roughness, slope, correlative length and terrain information entropy, etc. Based on a digital elevation model （DEM）, qualitative and quantitative analyses are given with graphs of terrain navigation performance and suitability. By means of statistical analyses and threshold value settings, a suitable terrain is selected with better navigation performance. From the results a terrain database can be established for navigation, terrain suitability evaluation and flight course planning.
出处
《应用科学学报》
CAS
CSCD
北大核心
2006年第6期608-612,共5页
Journal of Applied Sciences
关键词
地形轮廓匹配
地形参数
信息熵
相关适配性
TERCOM
terrain parameter
information entropy
correlation suitability
