Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Reexamination Certificate
2006-06-20
2006-06-20
Phan, Dao L. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
C342S357490
Reexamination Certificate
active
07064709
ABSTRACT:
A system and method are provided for determining a position of a Global Positioning System (GPS) receiver prior to bit and frame synchronization. As such, the time-to-first-fix is substantially reduced. More specifically, pseudoranges to five GPS satellites are measured by correlating locally generated Pseudo-Random Number (PRN) codes with signals received from the GPS satellites. After correlation, the pseudorange measurements are correct with an unknown integer number of milliseconds error, which is different for each of the pseudorange measurements. Using the measurements of the pseudoranges and a mathematical model where each of the pseudorange measurements is forced to have a common channel time error, the user position and the common channel time error are determined prior to bit and frame synchronization.
REFERENCES:
patent: 5786790 (1998-07-01), Abbott
patent: 6516021 (2003-02-01), Abbott et al.
patent: 6618670 (2003-09-01), Chansarkar
patent: 6734821 (2004-05-01), van Diggelen
patent: 2005/0225483 (2005-10-01), Abraham et al.
Norman Charles
Weisenburger Shawn
Phan Dao L.
RF Micro Devices, Inc.
Withrow & Terranova , PLLC
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