Dme an adaptation to the air system operating frequency communication method and system

The present invention discloses a method and an air-ground communication system adapted in DME system operating frequency, relates to the field of space communication, the method comprising: in a Communications System, the onboard terminal position of each base station stored in the route of flight and operating frequency information; on-board terminal according to its current location and the pre-stored location information of the base stations, the base station currently belongs is determined, and the operating frequency of the base station in accordance with the pre-stored information, determining the operating frequency of the onboard terminal; using the onboard terminal operating frequency for the air communicating with the base station currently belongs. The present invention achieves the air-ground communication between a terminal adapted in DME airborne system operating frequency and the base station to which it belongs, and airborne during communication terminal and the base station to which it belongs, without interference to the DME system.