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Proceedings of the Workshop - United Nations Office for Outer ...

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EXPANDING GLOBAL NAVIGATION SERVICESprobably would require encryption in order to limitaccess.52Universal Access to GNSSThe Chicago Convention, Art 15, states <strong>the</strong> principlethat air navigation facilities provided <strong>for</strong> public useshall be accessible under “like uni<strong>for</strong>m conditions” <strong>for</strong>aircraft <strong>of</strong> all contracting states. The treaty principle <strong>of</strong>non-discrimination has been upheld by U.S. nationalcourts.33 The principle <strong>of</strong> non-discriminatory access toair navigation assistance being well established bothinternationally and nationally, <strong>the</strong>re appears to be noobjection to non-discriminatory access to GNSS. Aprecedent exists in <strong>the</strong> UNGA Resolution on remotesensing satellites which guarantees access to data onnon-discriminatory terms. The principle <strong>of</strong>non-discriminatory access (including access toaugmented GPS services) under uni<strong>for</strong>m conditions wasadopted in <strong>the</strong> ICAO Charter on Rights and Obligations<strong>of</strong> States Relating to GNSS Services.54A right <strong>of</strong> universal access would be compatiblewith a charge <strong>for</strong> services as long as all GNSS usersare charged uni<strong>for</strong>mly. The UNGA Resolution onRemote Sensing is a precedent.55 While it provides <strong>for</strong>non-discriminatory access it does not preclude remotesensing services from charging <strong>for</strong> <strong>the</strong>ir services.Selective AvailabilitySelective Availability (SA) <strong>of</strong> <strong>the</strong> GPS service deservesmention because GPS will change in <strong>the</strong> future whenSA is eliminated. GPS currently is available at twolevels <strong>of</strong> service: <strong>the</strong> Standard Positioning Service52 Galileo, supra n. 4, at 22“ Aerolineas Venezulana v. Dade Country Airport, 196054 ICAO Doc. A32-WP/24, Appendix A. See discussion <strong>of</strong>Charter on Rights and Obligations <strong>of</strong> States Relating to GNSSServices below at VII55 Principles Relating to Remote Sensing <strong>of</strong> <strong>the</strong> Earth from<strong>Outer</strong> Space, International Instruments <strong>of</strong> <strong>the</strong> <strong>United</strong> <strong>Nations</strong>, at305163(SPS) and <strong>the</strong> Precise Positioning Service (PPS). TheSPS is available world-wide free <strong>of</strong> user charges. SPSprovides positioning accuracy <strong>of</strong> 100 metershorizontally and 156 meters vertically and time transferaccuracy to Coordinated Universal Time within 340nanoseconds. The more accurate PPS is available toU.S. government and to o<strong>the</strong>r governments (<strong>for</strong> civilianand military uses) through special agreement with <strong>the</strong>Department <strong>of</strong> Defense. It provides <strong>the</strong> most accuratedirect positioning, velocity, and timing in<strong>for</strong>mationcontinuously available from <strong>the</strong> basic GPS. It providespredictable positioning accuracy <strong>of</strong> at least 2 2 metershorizontally and 27.7 meters vertically and time transferaccuracy to Coordinated Universal Time within 200nanoseconds.56 The purpose <strong>of</strong> this difference in quality<strong>of</strong> service is to provide an advantage to <strong>the</strong> militaryusers and to deny such advantage to o<strong>the</strong>rs. SAevidences <strong>the</strong> military origin <strong>of</strong> GPS.The end <strong>of</strong> SA was announced in <strong>the</strong> 1996 U.S.Presidential Decision Document (PDD) stating that <strong>the</strong>SA will be terminated and that <strong>the</strong> more accurate GPSservice will become available to <strong>the</strong> civilians users assoon as military technology enables <strong>the</strong> military toobtain <strong>the</strong> equivalent <strong>of</strong> <strong>the</strong> SA advantage in differenttechnical ways. For that purpose, each year beginningin <strong>the</strong> year 2000, <strong>the</strong> President will evaluate whe<strong>the</strong>rSA can be eliminated. The PDD decided that SA will beturned <strong>of</strong>f at <strong>the</strong> latest in <strong>the</strong> year 2006.57 Related to <strong>the</strong>PDD, U.S. Vice President Gore announced on 30March, 1998 that a second civilian signal will beprovided by GPS. The Vice President announced that<strong>the</strong> <strong>United</strong> States will provide <strong>the</strong> second civilianfrequency by <strong>the</strong> year 2005. The new signal will bebuilt into <strong>the</strong> next generation <strong>of</strong> GPS replacementsatellites (Block IIF satellites). Vice President Gorefur<strong>the</strong>r announced: “GPS civil signals are, and willcontinue to be, provided free <strong>of</strong> charge to consumers,businesses and scientists around <strong>the</strong> world.” Yet a thirdsignal dedicated to safety-<strong>of</strong>-life will also be madeavailable by <strong>the</strong> year 2005,58 This means that “civilianssoon will have access to <strong>the</strong> same type <strong>of</strong> capability [as56 SPS accuracy is increased greatly by GNSS augmentation57 Supra n. 1258 Supra n. 36

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