Onboard avionic system for communication between an aircraft and the ground and method for managing a radio channel of such a system

A method for managing the radio channel to be used by a radio communications unit of an avionic communication system of an aircraft, comprising:

• a service unit to which are connected various equipment of said aircraft,
• at least one radio communications unit for providing communication between said avionic system and a communications system on the ground via a radio channel,
• a configuration unit provided with a control unit,
• a geolocation unit provided for supplying the control unit with data related to the present position of said aircraft and
• a database in which are recorded, for each flight zone that the aircraft has flown over during previous flights, data relative to the use of the radio channels which are available in said flight zone in question as well as data relative to the radio conditions for said available radio channels,
• said configuration unit being interfaced with said radio communications unit such that said radio communications unit supplies said configuration unit with data relative to the radio conditions of the channel currently in use,
• said configuration unit, on the basis of the geolocation data of the aircraft which are supplied to the configuration unit by the geolocation unit, of data on the radio conditions of the channel currently in use supplied by the radio communications unit and of data coming from the database, being configured to determine if the channel currently used by the radio communications unit should be changed or not and, if such is the case, being configured to determine the new channel to be used and being configured to command the change to the new channel to be used,
• wherein said method comprises:
• detecting, with said configuration unit, change in radio conditions for determining, on the basis of geolocation data of the aircraft which are supplied to it by a geolocation unit, data on radio conditions of the channel currently being used provided by the radio communications unit and of data relative to the use of the radio channels which are available in said flight zone in question, as well as data relative to the radio conditions for said radio channels, coming from the database, if the channel currently in use by the radio communications unit should be changed or not,
• filtering, with said configuration unit, available radio channels in said flight zone for determining the new channel to be used and
• controlling, with said configuration unit, the radio communications unit by commanding a change to said new channel to be used by said radio communications unit.