http://www.cmtinc.com/gpsbook/chap7.html
http://en.wikipedia.org/wiki/Helical_antenna
http://www.doylesdartden.com/gis/Improve_GPS_Accuracy.html
http://en.wikipedia.org/wiki/Kalman_filter
http://www.hindawi.com/getarticle.aspx?doi=10.1155/2008/261384
https://www.courses.psu.edu/aersp/aersp055_r81/satellites/gps_details.html
http://pubs.caes.uga.edu/caespubs/pubcd/B1269.htm
http://www.palowireless.com/gps/tutorial2.asp
http://www.hartrao.ac.za/geodesy/gps.html
http://en.wikipedia.org/wiki/Global_Positioning_System
http://www.directionsmag.com/article.php?article_id=228&trv=1
http://www.cmtinc.com/gpsbook/index.htm#chap9
http://www.cmtinc.com/gpsbook/index.htm#chap5
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