导航系统中广泛采用激光测距确定星地间距离,双向反射分布函数可精确描述实际物体反射光的情况,是研究激光测距方程的有效手段。结合目标反射几何模型,计算得到透镜各点接收目标反射光强的表达式。对目标光斑和接收透镜进行网格划分,仿真得到透镜面元接收目标反射的光强分布和透镜接收的瞬时光强,并讨论了平面目标的网格步长选取和计算次数。当光束从不同空间位置入射至平面目标表面时,根据探测器-反射棱镜之间距离与接收光强的对应关系得到激光测距方程的待定参数。实测数据验证了理论计算的正确性。 Laser ranging widely used in the navigation system to determine the distance between the stars, bivariate reflection distribution function can accurately describe the actual object reflected light is an effective means of laser ranging equation. Combined with the target reflection geometry model, the expression of the target reflected light intensity at each point of the lens is calculated. The target spot and the receiving lens are meshed, the intensity distribution of the reflected light received by the lens element and the instantaneous light intensity received by the lens are simulated, and the selection and calculation of the grid step size of the plane target are discussed. When the beam incident from different spatial positions to the plane target surface, according to the distance between the detector - reflecting prism and receive the corresponding relationship between the light intensity to obtain laser ranging equation to be determined parameters. The measured data verify the correctness of the theoretical calculation.