A GNSS-Based Time Division Multiple Access Data Link

Abstract

This article describes a concept for the broadcast of satellite-based position data. This data has the potential for use for air traffic control applications such as situational awareness or collision avoidance. The concept, called Global Navigation Satellite System (GNSS) time synchronized time division multiple access, uses a method of allocating time slots for broadcast of position data by aircraft on an absolute satellite-derived time line. An on-board unit called the GNSS transponder utilizes a satellite receiver, a data link transmitter and receiver, and a processor. Included in the article are descriptions of the GNSS transponder, message formats, and possible extensions of the concept for operational use. © 1994 John Wiley & Sons, Inc.