关键词: 半实物仿真, 梯度下降, 射频阵面, 飞行转台, 试验坐标系

Abstract:

Considering homing guidance test in the hardware-in-loop simulation, commands of flight simulator and antenna array are likely to exceed their ranges when the target vehicle maneuvers with a large cross range. To solve this problem, the adaptive field-of-view method is proposed to enhance simulation ability in laboratory. Inflight aircraft attitudes and missile-target line-of-sight angles are chosen as state parameters, and the optimal performance function can be established with maximum servo angle of both flight simulator and antenna array. Gradient descent algorithm is applied to acquire the optimal bias angles between the laboratory coordinate system and the launch inertial coordinate system. Considering the shifts of the optimal performance function in different flight phases, quadratic polynomial smoothing method is further employed to obtain the perfect bias angles, so that both flight simulator and antenna array can be driven properly and stably. Through fixed-state and full-trajectory simulation experiments, the effectiveness and superiority of the design method are demonstrated, maximizing the simulation capability of missile-target relative motion within limited laboratory conditions.

Key words: hardware-in-loop simulation, gradient descent, antenna array, flight simulator, laboratory coordinate system