Research On Diversion Path Planning Under Thunderstorm Weather

Dangerous weather threatens flight safety and affects airspace capacity and flight operation efficiency.The current implementation of ground waiting,circling in the air and other measures will lead to a large number of flight delays and other problems.Implementing dangerous weather diversion is meaningful for ensuring aircraft flight safety and improving flight punctuality.Therefore,this thesis studies the static diversion and dynamic diversion path planning and simulation optimization technology under thunderstorm weather.Firstly,the flight-restricted zoning and dangerous weather diversion path planning techniques are reviewed.The influence of thunderstorms on flight,the basic theory of diversion,the detection and detour regulations of thunderstorm weather are summarized,and the necessity of diversion path planning based on thunderstorm weather is proposed.Secondly,it analyzes different flight-restricted area setting methods,and selects the Graham algorithm suitable for the design of flight-restricted areas in thunderstorm weather.Aiming at the inadequacy of setting up a thunderstorm flight-restricted area for diversion path planning,the grey prediction model is used to predict the flight-restricted area,and the flight-restricted area is re-designated.Then,taking the re-routing path planning of a single aircraft as the research object,fully considering the performance and safety of the aircraft,the objective function with the shortest re-routing path is established.The static re-routing path planning of the A*algorithm is used,and the improved algorithm is applied to the calculation example.The results show that the path planned by the improved A* algorithm is better than the traditional A* algorithm in length.Considering that the aircraft needs to minimize maneuvering turns when flying around dangerous weather,the quadratic Bezier curve is used to smooth the solved diversion path.Comparing the length of the smoothed path,it is better than the unsmoothed path.Finally,considering the limitations of static diversion,in order to meet the needs of dynamic dangerous weather for aircraft to fly around,a dynamic diversion path planning based on improved artificial potential field method is proposed.According to the dynamic changes of dangerous weather,the dynamic diversion constraints are adjusted,and the shortest diversion path is used as the objective function.The applicability of the improved algorithm is verified by numerical example simulation.The quadratic Bezier curve is used to smooth the dynamic diversion path.After processing,the optimized diversion path is obtained,which provides a certain reference for dynamic diversion path planning.