关键词: 光船;光束扩展;飞行仿真

Abstract: Laser beam spreading,lightcraft pitching and lateral offset are some main factors which restrict the altitude that lightcraft can reach during free flight test.Analytical investigation shows that the expansion of laser beam spreading results in the reduction of the laser power received by lightcraft dramatically,and lightcraft pitching changes the direction of thrust but lightcraft pitching moment is not accumulative during flight.Lightcraft lateral offset changes the thrust and side force of lightcraft.A numerical method for lightcraft flight simulation is developed and the simulation results show that lightcraft may lose thrust before the arrival of possible altitude because of lightcraft lateral offset.Reducing lateral offset and laser beam spreading can dramatically improve the lightcraft flight height in free flight.

Key words: Lightcraft;Beam spreading;Flight simulation