基于高度控制的拖靶定高飞行分析

超低空飞行的航空拖靶需要高精度的高度控制，而作为试验和训练的消耗性装备，其低成本设计要求使得航空拖靶不能采用常规飞行器的高度控制方法。针对以拖曳力为飞行动力的航空拖靶，研究其基于非姿态控制的定高飞行的运动特性。定高飞行航空拖靶采用高稳定性的气动布局，并基于准直接力控制的升降舵面进行高度调整操纵。通过建立拖靶的纵向运动数学模型，设计非姿态控制定高飞行控制方法，详细分析拖靶气动特性，并进行定高飞行控制的仿真计算。计算结果给出拖靶的高度控制能力及飞行状态，结果表明拖靶具有一定的高度调整能力，可以实现定高飞行。

ANALYSIS OF INVARIABLENESS ALTITUDE FLIGHT OF AERIAL TOW TARGET

The altitude controlling for aerial tow target of flight at lower-altitude can not adopt orientation-control by reason of moderate cost. This paper considers the problem of invariableness altitude flight for aerial tow target by one-dimensional altitude control (non-orientation-control). The aerial tow target for invariableness altitude flight is provided with higher-stability, and it has elevators that is used to produce motion up or down by approximately derect lift. In this paper, it is described dynamically modeling and automatically controlling the motion of invariableness altitude flight. The aerodynamics characteristic of aerial tow target is analyzed, and some typical results in a digital computer simulation are provided. The results show that the aerial tow target system can control flight altitude and achieve invariableness altitude flight.