Time fit interval for ephemeris data subframe 4 and 5

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Unformatted text preview: odels Position information (truncated) for up to 32 satellites Health of each satellite Data relating GPS time to UTC time Ionoshpere delay model parameters Corrects for relativistic effects EECS 455 (Univ. of Michigan) Fall 2012 October 16, 2012 31 / 62 Lecture Notes 12 GPS Source of Errors Effect Troposheric effects Ionospheric effects Satellite clock errors Multipath distortion Ephemeris errors Errors ±1 m ±0.5m ±2 m ±1 m ±2.5m Total accuracy on the order of 15m (50 feet). EECS 455 (Univ. of Michigan) Fall 2012 October 16, 2012 32 / 62 Lecture Notes 12 GPS Time to Synch vs. Complexity To determine range, a correlation with each satellite must be accomplished To find the starting point for each signal many correlations must be completed We can speed up the process by doing many correlations in parallel. This requires more hardware. Tradeoff between complexity and performance. EECS 455 (Univ. of Michigan) Fall 2012 October 16, 2012 33 / 62 Lecture Notes 12 Other Global Positioning Systems GPS II GLONASS (Russian) Galileo Positioning System (Europe) COMPASS Navagation System (China) IRNSS (India) DORIS (France) EECS 455 (Univ. of Michigan) Fall 2012 October 16, 2012 34 / 62 Lecture Notes 12 GPS Receiver Front End EECS 455 (Univ. of Michigan) Fall 2012 October 16, 2012 35 / 62...
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This note was uploaded on 02/12/2014 for the course EECS 455 taught by Professor Stark during the Fall '08 term at University of Michigan.

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