this invention relates to a structure of an active antenna system of a mobile and a satellite navigation method using the system . the present invention provides a structure of an active antenna system of a mobile and a satellite tracking method using the system , in which beams are formed and then directed by using sub - array concept , the tracking accuracy becomes to high by using double beam satellite tracking mode for tracking the satellite , tracking loss is reduced and positions are more accurately tracked during movement using an absolute steering sensing mode .