Electromagnetic Environment Of The Airport Navigation Station Based On The Interference Of Electrified Railway Analysis And Research

With the development of science and technology,modern airport navigation landing system is more and more complicated.With available space decreasing gradually,electric railways enter an airport holding headroom area become inevitable tendency.In order to guarantees aircraft landing safely,body of the book analyses airport electromagnetic environment with electric railway distraction.Airport navigation station headroom area cannot have floor obstruction to hinder navigation and flying.In electric railway and the airport intersection environment,the fact that airport headroom zone time may carry out repeated radiation and the navigation station who reflects affects an airport thereby on the electromagnetic wave that the airport navigation station launches since the locomotive dimension is bigger.Secondly,our country railway traction techniques is also conversions from dc drive to communicate drive,high-power semiconductor device in these devices changes with switch higher frequency go along high voltage heavy current,voltage and voltaic rate of change are in general all comparatively big,which may produce a harmonic in dragging electric current from this definitely. It is capable to do the job producing electromagnetic radiation contaminating, affecting the airport navigation station thereby externally.Thirdly,Long conductor in contacting the net cable line is also effective radiation source,radiation frequency is in 150 kHz～20 MHz range mainly,and it may be influence medium frequency wave guidance station。Finally,when the locomotive speeds past electric railway and the airport intersection environment,the discharging coming into being between pantograph and contacting the net cable system,the safety of the airport aircraft lands may be affected.Adopt regulation amounts to follow moments method and physical optics,the body of the book proceed theoretical analysis to the intersect environment of electric railway and airport.Moment method is the numerical value base on electromagnetic field integral equation.Major merit of integral equation lies in,on one hand because of analytical inclusion of boundless distance radiation condition of electromagnetic field is already in integral equation,the relational between unknown quantity can be accurate numerical value dispersion.On the other hand,unknown number that it produce is in general much fewer than differential Equation.moments method have an overall situation,the matrix coming into being is dense matrix.Adopt physics optics to follow the contribution calculating its dispersion,is tied in wedlock basic target model-based expression,adopt discrete integral form that it simplify surfacing electric current accumulate to line integral so that it simplify calculation complicated degree;Edge diffraction calculates field of target edge diffraction adopt incremental length diffraction coefficients theory ILDC.Body of the book held analysis of aerodrome locating beacon electromagnetic waves's reflect,electric railway cable conductor's radiation,arcing distraction because locomotive engine drive approach area and most disturbed condition of electric railway to airport each navigation station,compared with actual measurement empirical result.In the end,the book gives a conclusion for the airport putting up,being the days to come construction to provide the theory basis and comparing with measuring experience result go along really.