某型号卫星微振动试验研究及验证

某型号卫星地面像元分辨率优于1 m,对成像质量要求很高。微振动成为制约该型号成像质量提升的关键因素之一。在完成微振动对成像质量影响的仿真分析后,对仿真分析的有效性和正确性进行了试验验证。该卫星微振动试验按照单机、分系统、系统和大系统4个层次展开:单机级试验主要通过六分量力测量微振动源的动态特性;分系统级试验主要通过结构加速度响应测量解决微振动传递特性是否正确的问题;系统级试验主要通过成像质量来验证微振动对光学系统影响的分析方法;大系统级试验主要通过在轨图像分析验证相关结论。上述试验对微振动从产生、传递到影响的各个环节进行了测试和验证。最终试验结果表明微振动相关工作达到预期目的,图像质量得到保证。

Study and verification of micro-vibration test for a satellite

The resolution of the image taken by the satellite is better than 1 meter, and other requirements of the image quality are also stringent. So the micro-vibration is a key problem which affects the optical system. The image quality influenced by micro-vibration is simulated, the model and the analysis method are then verified by test. The micro-vibration test is conducted on four levels, including the instrument, the subsystem, the system and the total system. The dynamic characteristics of the micro-vibration source are determined by 6-DOF force measurements in the instrument test. The transmission characteristics are obtained by acceleration measurements for the satellite structure in the subsystem level test. And the method for analyzing the influence of the micro-vibration on the image quality is verified by the image from the optical system in the system level test. The image quality is verified by the on-orbit image analyses. All the links of the micro-vibration, including the source, the transmission and the influence, can be measured and confirmed by those tests. It is indicated that the image quality is ensured and the main goal of work concerning the micro-vibration is achieved according to the test results.