论文部分内容阅读
由航天器上反作用飞轮、太阳帆板等部件产生的平台在轨振动是影响高分辨率遥感器成像质量的重要因素。基于LANDSAT-4平台模拟振动谱建立了平台在轨振动环境下遥感成像模型,讨论了航天器平台振动谱中各典型振动信号成分的强度对像质的影响,并将各振动成分依照对像质的影响强烈程度进行了排序,指出均匀白噪声成分所引起的颤振对像质的影响超过低通噪声成分所引起的像移。讨论了低通噪声成分的频谱形状与像质之间的关系,给出了带宽与噪声增益之间的拟合公式。通过搭建硬件实验平台,对仿真结果进行了验证。研究结果为航天器平台与遥感器隔振设计分析提供了依据。
The on-orbit vibration of the platform generated by reactive spacecraft, solar sailboard and other components on the spacecraft is an important factor affecting the imaging quality of high-resolution remote sensors. Based on the simulation vibration spectrum of LANDSAT-4 platform, the remote sensing imaging model of platform vibration under on-orbit vibration condition is established. The influence of the intensity of each typical vibration signal component on the image quality of spacecraft platform vibration spectrum is discussed. It is pointed out that the influence of the chatter caused by the uniform white noise component on the image quality exceeds the image shift caused by the low-pass noise component. The relationship between the spectral shape and image quality of the low-pass noise components is discussed, and the fitting formula between bandwidth and noise gain is given. By building a hardware experimental platform, the simulation results were verified. The results provide the basis for vibration isolation design analysis of spacecraft platform and remote sensor.