Patent ID: 8244416

Claim:
A process for evaluating an error ( 16 ) in an aircraft positioning ( 13 ) generated by an on-board positioning system ( 3 ), comprising automatically: recording the aircraft positioning ( 13 ) generated by the positioning system ( 3 ); detecting, through radar means ( 2 ), a presence of at least one group of targets ( 17 , 18 ) arranged on the ground; measuring, through said radar means ( 2 ), the position ( 15 ) of said at least one group of targets ( 17 , 18 ) with respect to the aircraft positioning ( 13 ); and evaluating the error ( 16 ) in the aircraft positioning ( 13 ), comparing with at least one threshold value, a value of at least one reference magnitude being characteristic of a difference existing between the measured position ( 15 ) and a known position ( 14 ) of the group of targets with respect to the aircraft positioning ( 13 ), wherein said group of targets ( 17 , 18 ) is arranged according to a particular geometrical shape being adapted for a detection by the radar means ( 2 ), and in that, for detecting the presence of the group of targets ( 17 , 18 ), vectors are determined with respect to the aircraft from intensity maxima ( 23 , 24 , 25 ) of return signals, received and measured by the radar means ( 2 ), and a check is performed to determine whether a geometrical shape achieved by such vectors corresponds to the particular geometrical shape of said group of targets ( 17 , 18 ).