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为实现对卫星平台力学环境的合理约束,研究了空间相机颤振与成像调制传递函数(MTF)下降的关系。通过理论分析,建立了基于统计矩的颤振传递函数的数学模型,实现了在特定函数振动和已知振动曲线情况下对MTF下降曲线的计算。针对某空间相机,利用MATLAB软件的图形用户接口(GUI)编制了颤振成像MTF计算软件,计算了在有随机噪声的正弦型振动情况下不同振动幅值和频率对应的MTF值,得出该相机对于平台颤振的要求为:在0.04ms积分时间内其振动角幅值小于0.05″,并避免相机产生200Hz以上的振动。通过半物理仿真实验,对非函数形式的任意振动导致的传递函数下降进行深入分析,在图像的像质退化与振动传递函数之间建立了联系。用图像分析的方法计算了传递函数,结果与数学模型计算得到的传递函数趋势一致。
In order to achieve the reasonable constraint on the mechanical environment of the satellite platform, the relationship between the flutter of the space camera and the decrease of the modulation transfer function (MTF) is studied. Through the theoretical analysis, the mathematical model of the flutter transfer function based on statistical moment is established, and the MTF descent curve is calculated under the vibration of certain function and the known vibration curve. For a space camera, MATLAB software graphical user interface (GUI) compiled dither imaging MTF calculation software, with random noise sinusoidal vibration of different vibration amplitude and frequency corresponding to the MTF value, come to the The requirements of the camera for the platform chattering are: the amplitude of the vibration angle is less than 0.05 "within 0.04 ms integration time and the camera is prevented from generating the vibration of more than 200 Hz. The transfer function caused by any vibration of the non-functional form through a semi-physical simulation experiment The relationship between image quality degradation and vibration transfer function is established.Transfer function is calculated by image analysis method and the result is consistent with the trend of transfer function calculated by mathematical model.