空中对地面目标群瞄准的视频图像分析方法

An Effective Method of Air-to-Ground Target Group Tracking and Aiming

采用视频图像分析与地面目标群运动特性相结合的方法 ,可以解决空中对地面目标群的跟踪和瞄准问题。为了对地面目标群运动特性进行预测 ,引入了宏观交通模型。根据飞行器质心和地面目标群中心相对位置的预测估计 ,得到了飞行器视频监视装置的下视角和方位角计算式 ,并且给出了地面目标群位置估计误差的在线修正方法。半物理仿真结果表明 。

We propose an effective method of locating the center of a ground target group always at the center of video image of airborne video monitor. Our method takes into consideration realistically that ground target moves along curved path. In a ground target group, the motion of each target is constrained by the characteristics of the motion of the whole group. Our video image analysis takes full advantage of this constraint to attain the goal of always locating the center of a ground target group at the center of video image of airborne video monitor. Fig.1 shows the location of aircraft c.g.(center of gravity),whose coordinates are X E,Y E and Z E , relative to center of ground target group ,whose coordinates are X G,Y G and Z G ; Fig.1 also defines two angles: elevation Φ and azimuth Ω of the video monitor , which can be considered to be located at aircraft c.g. Once we locate the center of ground target group at the center of video image of the airborne video monitor, we keep the center of ground target group continuously at the center of video image of the airborne video monitor by taking the steps as described in sections 3 and 4. Essentially section 3 describes how to predict the changes of elevation Φ and azimuth Ω after an elapse of time T d and eqs.(13a) and (13b) are needed for calculating these predicted changes. As time goes on, too much accumulated error causes the center of ground target group to deviate from the center of video image of the airborne video monitor. Section 4 describes how to perform on line compensation for accumulated error. Simulation results, explained in section 5 and shown in Figs.2 through 5, show preliminarily that our proposed method can locate the center of a ground target group always at the center of video image of airborne video monitor.