Since landing a rover on Mars is difficult at best, NASA is developing an advanced form of Doppler lidar that would send three continuous laser beams down to the surface.

由于在火星上登陆漫游车充其量是困难的，因此美国宇航局正在开发一种先进的多普勒激光雷达， 可以将三束连续的激光束发射到火星表面。