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星载光学遥感相机信噪比是仪器的一个非常重要的性能指标,信噪比的大小对测绘高程定位精度有很大影响。文章通过计算机仿真实验定量研究了光学遥感相机信噪比与测绘卫星高程定位精度之间的关系,包括三维地物模型建立与模拟成像、特征点提取与匹配、高程值计算等。实验结果表明在计算机仿真得到的理想图像中,当图像调制传递函数值为0.15时,信噪比应大于35dB才能满足测绘高程定位精度的要求。考虑到遥感相机在轨运行时大气和真实场景的影响,光学遥感相机信噪比应大于40dB。
The signal-to-noise ratio of satellite-borne optical remote sensing camera is a very important performance index of the instrument. The size of the signal-to-noise ratio has a great influence on the positioning accuracy of the mapping elevation. The article quantitatively studied the relationship between signal-to-noise ratio of optical remote sensing camera and elevation positioning precision of satellite by computer simulation experiment, including the establishment of three-dimensional object model and simulation imaging, feature point extraction and matching, elevation value calculation and so on. Experimental results show that when the image modulation transfer function is 0.15, the signal-to-noise ratio should be greater than 35dB in the ideal image obtained by computer simulation to meet the requirements of positioning accuracy of surveying and mapping elevation. Considering the influence of atmospheric and real scene when the remote sensing camera is in orbit, the optical remote sensing camera SNR should be greater than 40dB.