Radio system with multiple antenna arrays and adaptive waveforms

An autonomous radio navigation system, said autonomous radio navigation system being embarked on an airborne vehicle, characterised in that it comprises at least the following elements:

• a waveform generator generating, alternately, an FMCW wave representing a linearly frequency-modulated continuous wave for a radar imaging and a CW wave representing a wave kept at a given frequency for measuring a velocity vector;
• an amplification chain switched towards a set of transmit antennas;
• the set of transmit antennas comprising at least one lateral antenna and one ventral antenna;
• a set of receive antennas comprising at least one lateral antenna and one ventral antenna;
• a set of receivers linked to the set of receive antennas;
• and
• a signal processor implementing processing operations on FMCW signals received from the one or more lateral antennas of the set of receive antennas and spectrally analysing CW signals received from the one or more lateral antennas and from the one or more ventral antennas of the set of receive antennas so as to supply SAR images of the ground and components of the velocity vector of said airborne vehicle so as to enable navigation of the airborne vehicle based on the SAR images of the ground and the components of the velocity vector of said airborne vehicle.