Analysis Of Complex Electromagnetic Environment Around Airport And Research On Characteristics Of Typical Interference Sources

The electromagnetic environment around the airport is the key point to ensure the safety of air traffic.During the process of urbanization,potential interference sources such as high voltage power lines,buildings as well as electrified trains entered the airport protected area,resulting in the gradual deterioration of electromagnetic environment around the airport and posing threat to the flight safety of civil aviation.This paper researches on the complex electromagnetic environment around the airport.It respectively completes electromagnetic environment analysis of the airport communication equipment including the main communication system(VHF communication system),navigation system(instrument landing system,omnidirectional beacon,and non-directional beacon),and monitoring system(primary surveillance radar,secondary surveillance radar,and automatic dependent surveillance-broadcast.In this paper,the electromagnetic interference around the airport is divided into active and passive ones,and the interference characteristics of common interference sources are briefly studied.Based on the typical case of airport electromagnetic environment assessment,the paper completes the electromagnetic compatibility study of interference sources.This paper focuses on the influence of ambient broadband interference sources on the electromagnetic interference of the airport equipment.Aging street lights and electrified train arcs are selected as typical interference sources,receiver and spectrum analyzer are selected to receive data and the peak detection is chosen as the detection method.The spectrum data collection of typical interference sources is accomplished by electromagnetic test,which provides data support for the identification of interference source.Taking the aging street light as the target to be identified,original test data is subjected to the removal of strong background signal and test signal denoising process,peak features and envelope features are extracted after pre-procesiing original data,separately propose feature similarity matching index.When multiple peak features are consistent with those of interference source in the template database and the envelope similarity is above 0.85,it is considered as the same type of interference source.Identification of aging street light is accomplished and compare with other interference sources characteristic parameters to verify the effectiveness of identification method.Based on My SQL database management system,the My SQL Workbench visualization platform is used to build a template database of interference sources around the airport,which is beneficial to the systematic management and sharing of interference sources spectrum data,it provides data support for quickly identifying the type of interference sources around the airport.