Study Of Aircraft Conflict Detection Based On Continuous Descent Operation

With the development of the global economy,the industry of air transportation has been continuously developing and progressing.At the same time,the development of the aviation industry has also encountered some problems.The contradiction between people’s increasingly high living environment requirements and the increasingly high impact of aircraft on resource and environment have become more prominent.Therefore,the aviation industry’s pollution to the environment should not be careless.Resource consumption and urban noise pollution are unavoidable problems in the development of the aviation industry.In this context,ICAO has vigorously promoted Continuous Descent Operation(CDO)technology,which allows aircraft to use its own weight to achieve idling descent.The vertical profile of descent is basically linear,which not only can reduce fuel consumption,but also can be used by aircraft at the terminal.The higher altitude flight in the district reduces the impact of noise on the lives of urban residents.In the continuous descent operation state,the controller performs less intervention on the aircraft or only monitors the aircraft without conducting command on its operational status.This leads to an inevitable increase in the conflict between aircraft.Therefore,it is necessary to study the collision detection problem between the aircraft based on the continuous descentoperation.Based on the above situation,firstly,this paper studied the aircraft flight characteristics of continuous descent operation.Under continuous descent operation,the aircraft can achieve an optimal descent based on its own performance.Then,the design principles and requirements of the CDO program were analyzed.According to the EURO CONTROL’s aircraft performance database(BADA),the aircraft’s descent profile was analyzed.With the interpolation,the continuous descent operation model of the aircraft was obtained.As an example,the Incheon Airport in Korea was used to analyze the actual operation of the CDO program.Then,the design principles and requirements of the CDO program are analyzed.Based on the operating characteristics of the CDO program,an accurate prediction model of the aircraft’s short-term flight path for continuous descent operation is established.For conflict detection,the concepts of flight interval and conflict are first introduced.The aircraft protection area model is studied.Based on the analysis of geometric deterministic algorithms and probability-based algorithms,the traditional conflict detection algorithm is improved by studying the conflict types of continuous descending operations.A continuous falling conflict detection algorithm was established and the conflict detection process was summarized.Then,taking the terminal area of Chongqing as an example,on the basis of analyzing the airspace structure and flight operations of the terminal area of Chongqing,the Air TOp simulation operation was used to adjust the aircraft’s operation trajectory several times,and aircraft conflict and continuous descent operation were implemented during the continuous descent operation.There are many scenarios such as aircraft collisions with traditional cascade descending aircrafts,collisions with departing aircrafts,and low altitude warnings.Finally,a MATLAB operating program was written,combined with VBA program to solve,and the aircraft data was used as the initial value.The conflict in different scenarios was respectively substituted into the conflict detection model to calculate the conflict situation and the results of the conflict with the simulation run.Compared with verification,the results are consistent,verifying that conflict detection models and algorithms for continuous descent operation are feasible.