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3 GPS Signal Structure. [After Dana, 1994]

3 GPS Signal Structure. [After Dana, 1994]

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Figure 2.3 GPS Signal Structure. [After Dana, 1994]
Table 2 .1 GPS satellites launch overview
Table 2 .4 GPS satellite clock corrections
Table 2 .5 GPS Satellite Ephemeris
+26 Figure 3.1 GDGPS Network [after GDGPS, 2009]
GPS MISSION PLANNING USING INTERNET-BASED DATA
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  • Apr 2010
The positioning accuracy using the GPS system depends mainly on the satellites constellation, i.e. the position and number of visible satellites in the sky during the observation session. To describe this parameter a new term has been defined, Dilution Of Precision or simply DOP. The DOP value describes the effect of the satellites positions on the...
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... Where (t) is the time of measurement by the receiver (4) • Corrected mean motion. (5) • Mean anomaly at time of transmission. ...
... The main question now is what ensures the integrity of the results obtained using this software. The integrity verification procedure is very simple, just comparing the results obtained from the "GPMP 1.0" with the results obtained from certified commercial software using actual field observations for an actual GPS station [5]. ...
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Proposed methodology for GPS mission planning
Article
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The GPS mission planning is all about calculating the dilution of precision (DOP) for the observation stations. The dilution of precision can be considered one of the most important effects on the accuracy of the calculated coordinates using the GPS system. Therefore this research focuses on the dilution of precision calculation methodology using the satellites ephemerides provided by the online GPS service agencies. This is demonstrated through the following steps (a) Stating the types of satellites ephemerides available through the internet. (b) Calculating satellites coordinates. (c) Determining the visible satellites at the observation station. (d) Calculating dilution of precision. After that the calculation methodology has been verified by comparing the results obtained from international commercial software using actual field observations by the calculated results using the mentioned equations and the online satellites ephemerides. Finally a comparison study between the available satellite ephemerides was carried out to determine the best type of satellite ephemerides to be used in the process of GPS mission planning.
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