瑞利散射计算精度在海洋水色遥感大气校正中起关键作用,该文研究卫星姿态对瑞利散射计算精度的影响。卫星姿态直接影响太阳、卫星几何角度的计算精度,进而影响瑞利散射计算精度。计算结果表明,卫星滚动角对瑞利散射计算影响最大,当滚动角为2.5°时,瑞利散射计算误差达10%,且冬季比夏季误差略大。俯仰角和偏航角的影响很小,当俯仰角和偏航角小于2.5°,瑞利散射计算误差小于1%。对宽视场水色遥感卫星,若在资料预处理过程中不进行卫星姿态的修正,则要求卫星滚动角小于0.3°,才能满足瑞利散射计算精度1%的目标。

The accuracy of rayleigh scattering calculation affects the quality of atmospheric correction of the ocean color\nremote sensing significantly·This paper studies howsatellite attitude affectthe accuracyof the rayleigh scattering calcula-\ntion·Satellite attitude directly affects the calculation of the relative geometries of sun and sensor, which determine the\nrayleigh scattering radiance·The results showthat roll angle affects rayleigh scattering calculation markedly, and the cal-\nculation error can reach 10% as the roll angle is 2·5°·However, the effects of the pitch angle and yawangle are small,\nand the calculation error is only 1% as the pitch angle or yaw angle is 2·5°·The result also shows that in order to\nachieve the 1% accuracygoal of the rayleigh scattering calculation, the satellite roll angle should be less than 0·3°if the\nsatellite attitude isn’t corrected in the ocean color remote sensing data preprocessing stage·