采用公式推导和仿真优化相结合的方式, 设计了一种测量水深的LiDAR光机系统。该系统光源采用532 nm和1 064 nm双频激光器, 设计532、647、1 064 nm三个接收通道, 拟定飞行高度140~500 m, 可变扫描角9°~15°, 发散角小于0.5 mrad, 水面点密度范围约为0.687~4.170点/m2。设计拉曼波段作为水深测量波段, 提高浅水区测量效果, 利用可变扫描角实现了不同高度下幅宽可固定、兼顾高分辨率和大视场角, 以适应不同应用场景。

A combination of formula derivation and simulation optimization was used to design a LiDAR optical-mechanical system for measuring water depth. The light source of this system used 532 nm and 1 064 nm dual-frequency lasers. Three receiving channels of 532, 647 and 1 064 nm were designed. The planned flight height was 140-500 m, the variable scanning angle is 9°-15°, the divergence angle was less than 0.5 mrad, and the surface point density range was about 0.687-4.170 points/m2. In this paper, Raman band was designed as a water depth measurement band to improve the measurement effect in shallow water. The variable scanning angle was used to realize the functions of variable resolution under a fixable width and the consideration of high precision and large field of view to adapt to different application scenarios.=