地形辅助导航系统中的数字地图误差模型辨识

Identification of DEM-Related Error Models in Terrain Aided Navigation

地形辅助导航系统在引入量测时便引入了与数字地图有关的误差，含数字地图制作误差及地形随机线性化误差两类．本文在建立系统误差模型的基础上研究了两类误差产生的机理、影响误差的因素、样本获取的手段及误差模型辨识等问题，并采用扩维系统仿真的方法研究了误差的平稳特性、白度、模型参数等特性及其对系统精度的影响，获得了对数字地图误差模型的基本估计．

When the measurement is introduced into terrain aided navigation system. the DENI (Digital Elevation Map )-Related errors, including DEM-making error and stochastic linearlzation error. are introduced too. In this paper,based on the system modelling,following issues are discussed: 1 the production mechanism of DEM-related errors;2 the factors influencing these errors: 3 the acquirements of the error samples; 4 the identification of error models; etc.. By means of the augmented system simulations the smooth performance, whiteness, model parameter estimation, and their influences to system accuracy for these errors are explored. Therefore,the basic evaluation of DEM-related error model has been developed.