Abstract: In the proposed method of radio satellite localization of points on the surface of the earth:a pseudolite transmitter (1) is placed on a masked point (P);the antenna (3) of radio localization means (2) is placed successively in a plurality of arbitrary points (P.sub.i) where reception of the signals transmitted by the satellite is satisfactory, and the phase of the signal transmitted by the pseudolite transmitter (1) and received by the antenna at said points is measured; andthe coordinates of the masked point (P) is determined as a function of said measurements and as a function of the coordinates of the points (P.sub.i).The apparatus includes a pseudolite transmitter (1) and a radio localization mobile receiver (2) having one of its channels allocated to receiving the signal (S.sub.p) transmitted by the pseudolite transmitter (1).