Research On Tactical Interval Management Of Multi-aircraft Based On 4D Trajectory

The prediction and planning of 4D trajectories of multiple aircraft in tactical phase is an important way to effectively manage airspace.Based on above,this paper proposes a research algorithm for 4D trajectory oriented multi-aircraft tactical phase interval management.This algorithm mainly focuses on the real-time calibration and extrapolation of 4D flight trajectory in the initial stage the detection and resolution of potential flight conflicts in the tactical stage,the online dynamic optimization of flight profile and the time control of the crossing point of the downstream for aircraft.Firstly,in order to improve the accuracy of real-time 4D trajectory prediction,a multi-mode interaction(IMM)algorithm is proposed to calibrate the real-time trajectory information downloaded from ADS-B and other air-ground data links.Then,the calibrated trajectory information is combined with the established state transition model to develop 4D trajectory extrapolation to predict the 4D trajectory of aircraft flying downstream.Secondly,aiming at the flight conflict between extrapolated 4D trajectories,the conflict detection strategy based on relative motion method is implemented first,and then the hybrid extrication strategy,which is used alternately in course adjustment and ground speed adjustment,is implemented to minimize the extrication time.In order to improve the accuracy of the release strategy,the wind speed vector generated in the 4D trajectory calibration phase can be considered.Thirdly,considering that the proposed decommissioning strategy is likely to deviate the aircraft from the expected arrival time(ETA)and lead to large arrival time errors,a dynamic optimization algorithm for airspeed profile is proposed.Firstly,the flight distance(S)is divided into n segments,the vacuum acceleration corresponding to each average segment is adjusted,and then the calibrated airspeed(CAS)of each average segment is optimized by using BADA model to reduce the arrival time error.Finally,the simulation and verification platform of the interval management research system of multi-aircraft tactical phase is built by using World Wind.The theories,techniques,methods and means put forward in the second,third and fourth paragraphs are summarized and displayed in stages.