Use Location Inquiry, Prevent Saturation Range For All Aircraft Response Is Caused By The System, Object Aliasing Problem, Reduce The Interference Within The System. At The Same Time, The Device On The Basis Of The Original A / C Response Provide Data Communication Function, With Monitoring And Data Link Communication Ability, Make The System Obtain Abundant And Accurate Target Information; Access To Civil Aviation And Other Cooperative Target Identity Information (Code And Address Code, Flight Number, Etc.), Height, Distance, Orientation, Location Information And Some Special Information; Provide Various Civil Aircraft Control Intelligence And Security Of Civil Aviation Flight Safety.