E.F.C.LaBerge Senior Fellow, Honeywell CNS RTC June 18, 2008
[email protected] Updated Analysis of Inmarsat and Iridium Aeronautical Services in the Same Oceanic Airspace. 1 IEEE/AIAA 26th DASC, October 2007, Paper 213 EFC LaBerge & D. Zeng Purpose and Scope of the Analysis • Investigate Iridium AMSS/AMS(R)S and Inmarsat AMSS/AMS(R)S on separate aircraft in the same oceanic airspace • Analysis is limited to Oceanic Airspace structured following DO-306 guidelines, since FANS-1/A datalink Air Traffic Service (ATS) has widespread approval for operations in oceanic airspace • Conclusions are not applicable to other operational scenarios or airspace, including: - Polar, continental enroute, terminal, approach, and airport surface airspace as defined in Eurocontrol/FAA COCR document; - Simultaneous independent operation of Iridium and Inmarsat AESes on the same aircraft; and - All non-aeronautical terminals and non-aeronautical services 2 Released to ICAO ACP WGM June 18, 2008 Conclusions • The probability of Inmarsat AMSS/AMS(R)S causing a service interruption that would affect the availability of Iridium AMSS/AMS(R)S operating on separate aircraft in oceanic airspace is very small • In oceanic airspace, Inmarsat AMSS/AMS(R)S out of band emissions from one aircraft do not cause harmful interference to Iridium AMSS/AMS(R)S on another aircraft: - The functioning of Iridium AMSS/AMS(R)S is not endangered; - No serious degradation, obstruction or repeated interruption of the operation of Iridium AMSS/AMS(R)S 3 Released to ICAO ACP WGM June 18, 2008 Full disclosure, etc. • This work was based on the volumetric interference approach briefed to AMCP WGA in 1998-2000… • …and supported by Iridium, LLC (the old Iridium).