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为使航空器安全地应对突发天气,快速脱离危险区域,通过探讨改变高度的改航方式,提出基于椭圆的改进威胁概率模型。根据改航规则,考虑安全、舒适、经济、梯度等因素,建立以航程最短为目标的改进飞行模型,分3种情况分别分析改航最短路径的规划方法,设计相关的启发式算法流程,并采用Matlab进行算例仿真模拟,以验证改航方式的有效性。结果表明:利用威胁概率模型可以确定突发天气的威胁区域;根据改航模型和算法,搜索威胁区域前后报告点连接形成的多条路径,选择最优改航路径,从而确定在何时何地以多大梯度爬升/下降,且改航后总航程增量较小。
In order to make the aircraft deal with the sudden weather safely and quickly out of the dangerous area, an improved ellipse-based threat probability model is proposed by exploring the method of changing altitude. According to the rules of diversion, considering the factors of safety, comfort, economy, gradient and so on, an improved flight model with the shortest flight range is established. The planning method of the shortest route of flight diversion is analyzed separately and the heuristic algorithm flow is designed. Using Matlab to simulate the example to verify the effectiveness of the modified approach. The results show that the threat probability model can be used to determine the threat area of sudden weather. According to the diversion model and algorithm, multiple paths formed by the connection of report points before and after the threat area are searched, and the optimal route change is selected to determine when and where Climb up / down at how much gradient, and the total increment after the change of navigation is smaller.