高分辨率敏捷卫星颤振对成像的影响分析方法

Analysis Method on Effect of Jitter on High Resolution Agile Satellite Imaging

高分辨率敏捷卫星在轨姿态机动成像过程中,姿态控制执行机构的控制力矩陀螺(Control Moment Gyro,CMG)在正常工作时会产生附加的扰动力和扰动力矩,经振动传递,造成相机内部敏感光学元件之间的相对运动,从而对图像品质造成影响。为了研究CMG颤振对高分辨率敏捷卫星成像的影响,文章采用集成建模分析方法,构建包括扰动、结构、控制、光学在内的颤振集成模型。以某型号空间相机为研究对象,对此相机的动力学特性和光学系统敏感度进行了分析,得到相机敏感光学元件的振动响应,以及颤振在相机焦面产生的像移,研究了CMG颤振对高分辨率敏捷卫星成像的影响分析方法,可为其他类型颤振的影响分析提供参考。

Attitude control actuator such as control-moment-gyro（CMG）produces additional disturbance when it outputs major driving moment with a jitter during attitude maneuverable imaging, resulting in degraded images. In order to study the effect of CMG jitter on high resolution agile satellite imaging, based on integrated modeling method, a disturbances-structure-control-optics integrated model of a space camera is carried out in this paper. Based on this model, the response displacement of each optical component and image motion is cal-culated and analyzed by using dynamics and optical analysis of space camera structural FEM, so the influence analysis method of jitter on high resolution agile satellite imaging is accomplished. The method proposed by this paper can be reference for other influence analysis of jitter.