Several L1 and L5 capable satellites are already on orbitand many more are launching soon. The operators of thevarious Satellite Based Augmentation Systems (SBASs)are actively investigating incorporating the newconstellations and new signals. We have recentlyproposed new messages for broadcast on L5. Thesemessages are intended for use in the MinimumOperational Performance Standards (MOPS) and aredesigned to allow SBASs to communicate corrections andintegrity information to the aircraft. Specifically, theyallow the use of L1 and L5 in combination to achievebetter performance than today’s use of L1-only. Theproposed L5 messages were designed to make better useof the limited data bandwidth between the SBASgeostationary satellites and the aircraft. In particular, theyare intended to allow for the simultaneous correction of atleast four constellations of navigation satellites.This paper evaluates real satellite clock and orbitperformance data and implements both the existing andproposed MOPS message formats. It then demonstratesthe benefits of the proposed messages. It furtherdemonstrates the new message structure’s capability tohandle satellite alerts. It provides a practicaldemonstration of functionality of the new messagestructure including the improved bandwidth capability tohandle multiple constellations.
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