飞行器无动力返场着陆过程中,由于初始速度、高度和位置不确定,会导致飞行器相对能量过高,不能在预定的机场着陆,并且可能造成危险。针对上述问题,本文借鉴了航天飞机的策略,采用S转弯的方式来消耗飞行器多余的能量,使飞行器无动力下滑过程中具有合适的能量,保证飞行器的安全着陆。本文首先详细讲述了能量消耗的基本思想,采用S转弯增加待飞距离的方案来消耗能量。接着,对S转弯的方向以及S转弯半径的大小进行了深入研究。最后,通过非线性三自由度制导仿真环境,对S转弯策略进行了仿真验证。结果表明,该能量消耗方案具有工程实用性和鲁棒性。 Aircraft unpowered During landing, uncertainties in the initial velocity, altitude and position can result in the aircraft being over-energized, unable to land at the intended airport, and potentially dangerous. In response to the above problems, this paper draws on the tactics of the space shuttle, using the S-turn method to consume the excess energy of the aircraft, so that the craft has the appropriate energy in the process of sliding without power to ensure the safe landing of the aircraft. This paper first describes in detail the basic idea of ​​energy consumption, using S turn to increase the distance to fly away from the program to consume energy. Then, the direction of the S turn and the size of the S turn radius have been studied in depth. Finally, the S-turn strategy is verified by nonlinear three-degree-of-freedom guidance simulation environment. The results show that the energy consumption scheme has engineering practicability and robustness.