Patent ID: 7973706
Filing Date: 2011-07-05
Classification: G01S

Abstract:
1. An SBAS navigation data update notifying system used in GBAS, which is an SBAS satellite navigation data update notifying system loaded on a ground based augmentation system which uses a GPS satellite and an SBAS satellite as navigation satellites and utilizes information from the navigation satellites for navigation, the SBAS navigation data update notifying system comprising: a ground system which estimates errors contained in ranging signals received from the navigation satellites, and formats and transmits correction information for correcting the estimated errors; and an airborne system which performs calculation of differential GPS positioning based on information provided from the navigation satellites and the formatted correction information, and displays a displacement from a regulated route, wherein: the ground system has a notifying device which notifies update of navigation data, when SBAS satellite navigation data used for generating the correction information is updated, by adding information regarding the update of navigation data to the correction information,; and the airborne system has a detecting device which detects an update notification of the SBAS satellite navigation data that is transmitted from the ground system, and a calculating device which performs calculation of the differential GPS positioning by switching the navigation data to the updated navigation data when detecting the update of the SBAS satellite navigation data.