| During the entire operation of the air traffic system,the terminal area is one of the most representative components.Deducing and analyzing the evolution of related parameters of the air traffic flow operating in this part can achieve a comprehensive,detailed or in-depth research and exploration of air traffic flow.In the process of air traffic flow related research,how to accurately and realistically combine different parameters and then analyze the characteristics of air traffic flow,it is essential to have a correct grasp of the entire air traffic system.First,the paper introduces the basic environment of air traffic flow operation in the terminal area,and conducts the necessary deduction and preliminary theoretical analysis of the evolution trend of the three parameters of speed,density and flow in the air traffic flow.The basic argument relationship and formula deduction results provide theoretical and formula support for the later model establishment.At the same time,the work flow of cleaning and previously processed of radar data was introduced briefly,and the results of visual processing of radar data and the exploration of related parameters were obtained.The preliminary statistical analysis and exploration of parameters such as radar control operation separation,flow and speed were conducted.Later simulation analysis provides data and simulation results support.Then,the paper transformed the Green Shields model into a basic model of air traffic flow parameters suitable for this paper.At the same time,the aircraft guidance model based on the concept of Equivalent Downwind leg is analyzed and introduced,and it is combined with the classic cell transmission theory,and the basic model of the approach air traffic flow parameters is analyzed to complete the regulation of related constraints and establish improved the approach air traffic flow parameter model focuses on analyzing the speed-density evolution trend.Then,in response to the "jump point" problem of the sudden decrease in speed in the speed-density evolution trend,the traffic wave phenomenon in ground transportation theory was innovative improved and theoretically formulated,and the separation wave model suitable for the air traffic field was established.It is used to analyze the local speed drop characteristics of the incoming air traffic flow in the terminal area,and then to achieve the purpose of analyzing the characteristics of the entireincoming air traffic flow.Finally,the simulation analysis of the model built in this paper is carried out,and the track clustering is performed to extract the three turning points.The radar data is used to analyze the speed-density evolution trend.It is expected that the main model constructed is suitable to be applied to the analysis of the actual approach air traffic flow.Subsequently,a simulation environment was established for preliminary verification of the separation wave model.The simulation results showed that the separation wave was real.The separation wave model was in line with the expected preliminary results.Based on the first two steps of the simulation analysis,the parameters of the parking wave and the dissipating wave are simulated and solved to obtain the length and number of the blocked aircraft queue.The model built in this paper is in line with the actual deduction conclusions and is applicable to analyze the phenomena and problems in the actual operation of the arrival air traffic flow. |
