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Solar activity could affect the reliability of the GPS and other satellite systems. Dramatic eruptions on the sun lead to storms in space which can have an adverse effect on the transmission of the GPS signal.
To understand the source of these geometric storms one must begin at the sun. While the sun is the source [...]
Archive for the ‘Navigation’ Category
SATELLITE NAVIGATION SYSTEMS SOLAR ACTIVITY ERRORS
Posted by author on August 14th, 2008
SATELLITE NAVIGATION SYSTEMS GEOMETRIC DILUTION OF PRECISION (GDOP) ERRORS
Posted by author on August 14th, 2008
The distribution of the satellite being tracked by a GPS receiver has an effect on position error and is termed Geometric Dilution of Precision. Although wider spaced satellites will result in a small position error if satellites are at low elevation they will produce a poor vertical position which can affect the determination of latitude.
If [...]
SATELLITE NAVIGATION SYSTEMS POSITIONAL OR EPHEMERIES ERRORS
Posted by author on August 12th, 2008
The exact position of very orbiting satellite within a positioning system constellation is being constantly monitored but very small positional or ephemeris errors do take place. These minute errors can occur between the specific monitoring periods and may result in small inaccuracies within the calculated position leading to errors in the order to approximately 2.5 [...]
Posted in Navigation 
Tags: ephemeris errors, exact position, inaccuracies, periods, positioning system, satellite, system constellation 
No Comments »SATELLITE NAVIGATION SYSTEMS SATELLITE CLOCK BIAS ERRORS
Posted by author on August 12th, 2008
These errors are caused by a minute discrepancies in the accuracy within the atomic clocks used within the satellite. Through these clocks are very accurate they are not perfect and through corrected for significant error very small discrepancies can translate directly into signal travel time measurement errors. These error can degrade the final calculated position [...]
SATELLITE NAVIGATION SYSTEM MULTIPATH ERRORS
Posted by author on August 12th, 2008
Multipath errors. Very similar to the ghosting effect sometimes seen on television reception are caused by reflected signal from surfaces near the receiver. The signal instead of following the straight path to the receivers antenna will bounced off various local obstructions thereby increasing the length of the signal from the satellite to the receiver. The [...]
