空间参考模型软件性能分析

Performance Analysis of Spatial Reference Model Software

空间参考模型是虚拟环境数据表示与交换的关键技术之一,也是精确描述和快速处理空间信息的基础。空间参考模型的数学基础是抽象坐标系的张成函数、参考基准和影射、坐标变换算法。数学分析表明,坐标变换的误差主要来源于算法中对张成函数的近似或者逼近处理。通过引入误差球的概念,可以定量分析各种坐标变换的最大误差。测试数据表明,在6000公里的高度范围内,坐标变换的最大计算误差不超过1.2毫米,平均计算时间不超过6微秒。对于大多数的仿真应用,空间参考模型软件的计算精度可以保证足够的空间一致性。

Spatial Reference Model（SRM） is not only one of the key technologies of synthetic environment data represent and interchange,but also the basis of accurate description and rapid procession of spatial information.The mathematical foundation of SRM includes the generating function of abstract coordinate system,the reference datum and mapping,the algorithm of coordinate transform.Mathematical analysis reveals that the main source of the error during coordinate transformation is due to the approximation of the generating function in algorithm.The maximum error of coordinate transformation can be analyzed quantitatively through the introduction of error ball.The test result proves that the maximum error of coordinate transformations does not exceed 1.2mm below the height of 6000 km and the average computational time does not exceed 6 us.For most simulation applications,the precision of the SRM software is accurate enough to ensure spatial consistency.