机载成像仿真系统的误差建模

ERROR MODELING OF SIMULATION SYSTEM FOR AIRBORNE IMAGING

实际一些精密设备的误差项较多 ,很难方便地加以描述并建立误差模型以实现科学合理的精度设计和误差补偿。虽然目前已有了一些误差建模方法 ,但都各有其适用范围 ,很难去理解和掌握。本文在多体系统理论的基础上 ,提出了杆、副坐标变换矩阵、杆、副误差变换矩阵的概念 ,并阐述了误差建模的方法。由于目前绝大多数设备的机械结构原理上都采用杆和副的组成形式 ,使得此误差建模方法更为形象 ,更易理解 ,在原理上更具普遍意义。同时以机载成像仿真系统为例 ,系统地描述了各误差 ,建立了该仿真系统的误差模型。

Many sources of error exist in precision equipments. It is difficult to describe them and build error models in order to realize resonable precision design and error compensation. There exist some error modeling methods, but each has its range of application, and is often inconvenient to apply in practice. In this paper, error modeling method was studied, based on multi-body system theory, concepts of bar and pair coordinate transformation matrix and the pole and pair error transformation matrix were proposed. The method is more visual and understandable compared with existing methods because par and pair remain the bases of mechanical structure of equipments. Finally, errors were analyzed, and error model was built up in the simulation system of airborne imaging as an example.