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...
View
Full Document
 Fall '08
 Stark
 Global Positioning System, Univ. of Michigan

Click to edit the document details