| In order to meet the growing demand for air transport,the number of civil navigation equipment stations is constantly increasing,which leads to the electromagnetic environment of the airport area becoming more and more complex.The signal coverage of navigation equipment is an important factor in ensuring flight safety and affecting the site selection,planning and layout of navigation stations,and providing a necessary basis for flight procedure design.Therefore,this paper starts with the modeling and simulation of the antenna signal of navigation equipment,and then considers the influence of terrain shielding,antenna performance and wireless channel attenuation,and carries out the simulation research on the electromagnetic signal coverage range of navigation equipment.It is of great significance to provide theoretical basis for future navigation equipment location planning and flight program design.Firstly,this paper established the mathematical model of the electromagnetic signals of the corresponding antennas by analyzing and studying the antenna types and the radiation characteristics of the antenna signals of the VHF omnidirectional beacon VOR,the rangefinder DME and the instrument landing system ILS ground equipment.Secondly,according to the antenna related theory and combined with the antenna specific parameters of each navigation station,the simulation of the antenna signal of different navigation equipment is realized based on MATLAB.Then,this paper presented a method to calculate the signal coverage range of navigation ground station by studying the factors affecting the signal coverage of navigation equipment,and the simulations validate the effectiveness of the method.Finally,this paper taking ILS/DEM equipment of Mianyang Nanjiao Airport and VOR/DME equipment of Chengdu Shuangliu Airport as examples to calculate the signal coverage of the navigation ground station at the specified altitude level,which displayed visually on a map.The simulation results show that the signal coverage meets the operational requirements of the instrument approach section. |
