Lecture10

Lecture10 - Geography 12 Maps and Spatial Reasoning We can...

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1 Geography 12: Maps and Spatial Reasoning Lecture 10: Position Determination Professor Keith Clarke We can measure direction in the real world! Resection Back azimuth Forward bearing + or - 180 Resection Example: Isola, Slovenia
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2 Best way to determine position: Use GPS • GPS is a Satellite-based Navigation System (GNSS) • Funded by and controlled by the U. S. Department of Defense (DOD) • Designed for military tasks: Dual Use • Operational since August 30 th , 1991 One of five such GNSSs • GPS Blocks I and II • GLONASS – Russian positioning system • Galileo – Proposed EU system, in design • Compass – Chinese system, under development – Regional/Global • Indian IRNSS – Regional • GPS 2.0 Block IIR Space Segment I • Space vehicles (SVs) send radio signals from space • The signals contain the time from on-board atomic clocks • The nominal GPS Operational Constellation consists of 24 satellites that orbit the earth in 12 hours • Often more than 24 operational satellites as new ones are launched to replace older satellites The Space Segment II The orbits repeat the same track and configuration over any point
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Lecture10 - Geography 12 Maps and Spatial Reasoning We can...

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