Some errors are introduced into existing sensor radiance models due to ignoring the anisotropy of the earth surface. Aiming at thia problem, a novel calculation model for sensor irradiance contribution, including effects of earth surface and atmosphere reflected light is proposed. This model takes three factors into account : earth surface reflection , atmospheric acattering and radiative transfer effect. Based on the model, a heuristic Monte Carlo predominant light sampling method is presented. Given parameters of sensor and spatial geometry, the influence of earth surfaee and atmosphere reflected light on space optical sensor can be calculated efficiently.%现有辐射计算模型不考虑地表的各向异性特征,导致计算结果存在较大误差.针对这一问题,提出一种新的地球与大气反射光对传感器照度贡献的计算模型.考虑了地表反射、大气散射和辐射传输三方面的影响因素;在此基础上提出一种启发式蒙特卡罗重点光线采样方法,该方法根据给定的传感器参数和空间几何参数高效解算地球与大气反射光对空间光学传感器探测能力的影响程度.
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