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authorRefik Hadzialic2012-06-06 18:47:38 +0200
committerRefik Hadzialic2012-06-06 18:47:38 +0200
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tree04f0d35d9acb1854df93ce233cb550b2ac47003b /vorlagen/thesis/src/kapitel_A.tex
parentWriting appendix (diff)
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GPS Picture
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@@ -430,6 +430,22 @@ To increase the speed of measurement report, reference time can be used to provi
information for the A-GPS in the MS of target entity. This field is of boolean
type, if set to true, reference time is included in the sent packets.
+Since the sent packets are not transmitted in real time but put on a stack and
+then sent to the MS, a time delay exists. A solution to this problem is to
+add extra seconds to the reference time being sent. In order to assess
+the amount of extra seconds to add, the GSM operator is required experimentally
+to verify his/her findings. \todo{see how much the reference time can deviate from current time}.
+
+The reference time being sent to the MS is Coordinated Universal Time (UTC). The GPS device
+receives UTC time from the satellites and adjusts the computer time. To set the correct
+time, time zone offset of the BTS ought to be set correctly.
+
+Finally, the refresh time of downloading new almanac and ephemeris data has to be set.
+The variable uses the hour unit, how often the data are being downloaded. If the data are
+used from a local GNSS station, refresh time of the ephemeris data should be set to
+every 30 minutes or 0.5 hours. The almanac data are valid for up to 180 days \citep{GPS-Guide} but are updated
+usually every day\footnote{Almanac update times can be found here:
+\url{http://www.navcen.uscg.gov/?pageName=currentNanus&format=txt}} \citep{GPS-Pentagon}
\newpage
\section{Sourcecode}