US Patent No: 6,337,657

Number of patents in Portfolio can not be more than 2000

Methods and apparatuses for reducing errors in the measurement of the coordinates and time offset in satellite positioning system receivers

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Abstract

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Disclosed are methods and apparatuses for generating the estimates of receiver's coordinates and/or time offset for a moment of time t.sub.n without large errors caused by short-term shading of a part of the observable global positioning satellites and also without large dynamic errors caused by the receiver movement. The receiver may be stationary or mobile (i.e., rovering). A set of snapshot-solution values for the position coordinates and time offset of the receiver at the time moment t.sub.n, and a set of predicted values for the position coordinates and time offset of the receiver at the time moment t.sub.n are generated. The accuracy of each of these sets are determined, and a set of refined estimates for the position and time offset of the receiver is generated based the snapshot solution values, the predicted position values, and the accuracies.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
TOPCON GPS, LLCPLEASANTON, CA39
TOPCON POSITION SYSTEMS, INC.PLEASANTON, CA8

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ashjaee, Javad Saratoga, CA 47 513
Zagnetov, Peter P Moscow, RU 1 14
Zhodzishsky, Mark I Moscow, RU 17 145

Cited Art Landscape

Patent Info (Count) # Cites Year
 
TRIMBLE NAVIGATION LIMITED (2)
5,296,861 Method and apparatus for maximum likelihood estimation direct integer search in differential carrier phase attitude determination systems 126 1992
5,590,043 Satellite positioning system filter 29 1993
 
Other [Check patent profile for assignment information] (1)
5,323,163 All DOP GPS optimization 59 1993

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
CSR TECHNOLOGY INC. (2)
6,665,612 Navigation processing for a satellite positioning system receiver 2 2001
7,751,974 Navigation processing for a satellite positioning system receiver 0 2005
 
SAMSUNG ELECTRONICS CO., LTD. (2)
6,567,712 Method for determining the co-ordinates of a satellite 9 2000
7,333,579 Robust symbol timing recovery circuit for telephone line modem 1 2003
 
AMERICAN GNC CORPORATION (1)
6,757,569 Filtering process for stable and accurate estimation 6 2001
 
DRS SIGNAL SOLUTIONS, INC. (1)
6,922,635 Method and system for determining absolute positions of mobile communications devices using remotely generated positioning information 32 2003
 
FUJITSU LIMITED (1)
7,542,532 Data transmission device and input/output interface circuit 2 2004
 
GMV AEROSPACE AND DEFENCE S.A. (1)
8,131,463 GNSS navigation solution integrity in non-controlled environments 1 2009
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (1)
8,249,371 Selective predictor and selective predictive encoding for two-dimensional geometry compression 1 2007
 
MAPVISION OY LTD. (1)
7,324,712 Quality factor 0 2002
 
NOKIA SIEMENS NETWORKS OY (1)
6,876,925 Two-stage interacting multiple models filter for use in a global positioning system 1 2003
 
TOPCON GPS, LLC (1)
7,522,099 Position determination using carrier phase measurements of satellite signals 12 2005
 
TRIMBLE NAVIGATION LIMITED (1)
8,134,497 Method and system for location-dependent time-specific correction data 0 2008
 
Other [Check patent profile for assignment information] (1)
6,510,354 Universal robust filtering process 8 2000

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