根据机载激光测深系统扫描部分结构,针对圆镜偏轴卵形扫描方式, 从光束发射方向出发, 基于扫描结构轴向关系利用光线反射定律推导出激光出射方向向量, 结合激光出射位置到海表点距离获得海面激光点坐标; 依据光线折射定律, 利用变折射率光线追踪算法推导出海底测深点坐标计算公式, 建立海面激光入射点及海底测深点坐标严密计算模型。根据模型定位公式, 分析扫描系统视准轴误差影响, 通过数值模拟, 分析扫描系统视准轴误差对定位精度影响, 为扫描系统单体设备加工、装调、集成检校提供依据, 为机载雷达测深系统提供海底测点精确计算、改正提供参考。

Consistent with the scanning structure of airborne laser bathymetry system, aiming at the oval scanning mode of circular mirror skew axis, starting from the beam emission direction and on basis of the axial relation of scanning structure, the laser output direction vector was derived by the law of light reflection. The coordinates of laser points on the sea surface were obtained by combining the distance from the laser output location to the sea surface point. According to the law of light refraction, the coordinate calculation formula of submarine bathymetric point was derived by using the variable refractive index ray tracing algorithm, and the precise calculation model of laser incident point and submarine bathymetry point coordinate was established. According to the model positioning formula, the influence of scanning system boresight error was analyzed. Through numerical simulation, the influence of scanning boresight misalignment calibration on positioning accuracy was analyzed, which provided the basis for the processing, installation, adjustment and the integrated checking of unit device in the scanning system. The positioning formula can provide reference for accurate calculation and correction of submarine points for airborne lidar bathymetry system.