Future of GPS

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Future of GPS New Applications • • • • • • Intelligent Vehicle/Highway Systems (IVHS) Intelligent Transportation Systems Automated Construction Equipment Time Determination/Time Transfer Atmospheric Sensing Aircraft Navigation and Landing GPS Modernization • New Block IIF scheduled to be launched in next few years (2007?) – Ability to transmit data between satellites – Autonomous navigation • • • • • Navigation accuracy maintained for six months (????) Uplink jamming less of a concern One upload per spacecraft per month (??) Minimize ground tracking Improved navigation Augmented Signal Structure • SA is now off and likely to stay off • Additional L5 carrier frequency – Ability to correct for ionospheric effects when using carrier phase – Modulated by a new civil code (similar to P-code) – L2-L5 produces extra wide lane – L1-L5 can be used as ionosphere free • Military Y-code replaced by split M-code GPS Augmentation • Want to use GPS for aviation – Reliability needs to be extremely good – Want to augment GPS to provide additional reliability and improve results • Local Area Augmentation Systems (LAAS) will use pseudolites – Should allow precision approach and landing • Category II/III GPS Augmentation • Can also use geostationary satellites – Will have broadcast capability – Transmit DGPS corrections and integrity messages • Wide Area Augmentation System (WAAS) will use Inmarsats to augment GPS – Operational sometime GNSS • Global Navigation Satellite System (GNSS) • Integration of different satellite navigation systems – Already have capability of combining information from GPS and GLONASS – Also includes augmentation from other kinds of satellites (like Inmarsat) – Also include Galileo when launched GNSS/LORAN-C • Long Range Radio Navigation (LORAN) – Used mostly for maritime navigation – Broadcast stations organized into ‘chains’ – Very similar to GPS • cannot provide vertical component – Can be used to augment GPS Hardware • In short, hardware will continue to get better, cheaper, smaller – Cost will drop if quantities increase in a way that everyone has (at least) one GPS receiver working in his/her life – Resolution of wave will improve (<0.1%) – More channels (for increased number of observables) • More frequencies and more satellites Software • In short, software will continue to get more sophisticated and run faster – Improved modeling or solution for unknown parameters – Better algorithms for solution – Faster computers will allow more to be done in the same amount of time GPS Products • Data will continue to improve – Centimeter level orbits will be available – Centimeter level positioning will be possible in real time – Sub-centimeter positioning will be possible by post-processing

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