Broadcasting Data from an SBAS Reference Network over Low Rate Broadcast Channels

摘要

Space Based Augmentation Systems (SBAS) have been developed principally to augment GPS for aviation and other safety of life applications. An SBAS reference network generates corrections and integrity information that are broadcasted primarily using geostationary satellites. However, SBAS information may also be transmitted on other data links so that the user has an auxiliary means of receiving the data. Existing systems are potential alternate data links for information generated by an SBAS such as the Wide Area Augmentation System (WAAS). However, some of these systems have very low data rates. This paper will discuss the usage of low rate data channel, such as LORAN-C, to provide an auxiliary data link for Space based Global Navigation Satellite System (GNSS) Augmentation System integrity and correction messages. It will detail the design decisions made in creating message systems with data rate lower than the WAAS data rate. Simulated performance of these systems will also be shown.