Geolocation system for calculating current coordinates at least in longitude and latitude of a current position of an aircraft (10, 11), said location system comprising: • at least two earth stations (2, 3) which are distinct from each other and are capable of transmitting radio signals at predetermined frequencies (f1, f2), said at least two earth stations (2, 3) comprising a first earth station transmitting said radio signals according to at least a first predetermined frequency and a second earth station transmitting said radio signals in at least a second predetermined frequency, • at least two receiving antennas (4, 4', 14, 14') comprising a first receiving antenna (4, 14) and a second receiving antenna (4', 14') respectively capable of receiving said radio signals, the receiving antennas having a degree of rotational mobility relative to a fixed frame of the aircraft, • an analysis unit of said radio signals, said analysis unit being connected to said at least two receiving antennas (4, 4', 14, 14') and making it possible to determine at least two directions of transmission (d1, d2) of said radio signals, said at least two transmission directions (d1, d2) comprising on the one hand a first transmission direction corresponding to a first line passing through said current position of the aircraft (10, 11) as well as through said first ground station and secondly a second transmission direction corresponding to a second straight line passing through said current position of the aircraft (10, 11) as well as through said second ground station, • a memory intended to contain all or part of a database comprising at least position data associating with said first and second predetermined frequencies (f1 and f2) of said radio signals respectively first coordinates in latitude and longitude of said first ground station and second coordinates in latitude and longitude of said second ground station, and • a calculator for calculating said current coordinates in latitude and longitude corresponding to said current position of said aircraft (10, 11) from a part of said first and second coordinates in latitude and longitude of said first and second ground stations (2 and 3) and on the other hand said first and second transmission directions (d1 and d2) of said radio signals, said analysing unit of said radio signals performing a first phase shift of 90° of said radio signals received by said first receiving antenna (4, 14) and then a second phase shift of 90° of said radio signals received by said second receiving antenna (4', 14'), characterised in that a rotation of said first and second receiving antennas (4, 14 and 4', 14') generates a diagram illustrating two cardioids (41 and 42) representative of a maximum amplitude of said radio signals respectively received by each of said first and second antennas (4, 14 and 4', 14'), a direction of transmission of said at least two transmission directions (d1 and d2) of said radio signals being identified when said two cardioids (41 and 42) are symmetrical with respect to a Y axis of the ordinates of said diagram. • at least two earth stations (2, 3) which are distinct from each other and are capable of transmitting radio signals at predetermined frequencies (f1, f2), said at least two earth stations (2, 3) comprising a first earth station transmitting said radio signals according to at least a first predetermined frequency and a second earth station transmitting said radio signals in at least a second predetermined frequency, • at least two receiving antennas (4, 4', 14, 14') comprising a first receiving antenna (4, 14) and a second receiving antenna (4', 14') respectively capable of receiving said radio signals, the receiving antennas having a degree of rotational mobility relative to a fixed frame of the aircraft, • an analysis unit of said radio signals, said analysis unit being connected to said at least two receiving antennas (4, 4', 14, 14') and making it possible to determine at least two directions of transmission (d1, d2) of said radio signals, said at least two transmission directions (d1, d2) comprising on the one hand a first transmission direction corresponding to a first line passing through said current position of the aircraft (10, 11) as well as through said first ground station and secondly a second transmission direction corresponding to a second straight line passing through said current position of the aircraft (10, 11) as well as through said second ground station, • a memory intended to contain all or part of a database comprising at least position data associating with said first and second predetermined frequencies (f1 and f2) of said radio signals respectively first coordinates in latitude and longitude of said first ground station and second coordinates in latitude and longitude of said second ground station, and • a calculator for calculating said current coordinates in latitude and longitude corresponding to said current position of said aircraft (10, 11) from a part of said first and second coordinates in latitude and longitude of said first and second ground stations (2 and 3) and on the other hand said first and second transmission directions (d1 and d2) of said radio signals,