System for determining position from pseudorandomly modulated radio signals Grant US-5805200-A United States of America 08 Sep 1998
System for determining position from suppressed carrier radio waves Grant US-5619212-A United States of America 08 Apr 1997
System for determining position from suppressed carrier radio waves Grant US-5384574-A United States of America 24 Jan 1995
System for simultaneously deriving position information from a plurality of satellite… Grant US-5194871-A United States of America 16 Mar 1993