US Patent No: 6,239,742

Number of patents in Portfolio can not be more than 2000

Method and apparatus for satellite positioning system based time measurement

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Abstract

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A method and apparatus for measuring time related to satellite data messages which are used with satellite positioning systems (SPS). In one method, a first record of at least a portion of a satellite data message is received at an entity, which is typically a basestation. The first record is compared with a second record of the satellite data message, where the first record and the second record overlap at least partially in time. Then a time is determined from this comparison, and this time indicates when the first record (or the source from which the first record was obtained) was received at a remote entity which is typically a mobile SPS receiver. Various other methods of the invention are described and various apparatuses of the invention are also described. The methods and apparatuses measure time of day using SPS signals without reading the satellite data messages which are transmitted as data within these signals. The methods and apparatuses are suitable for situations in which the received signal level is too weak to allow reading of the satellite data messages.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
SNAPTRACK, INC.SAN JOSE, CA59

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Krasner, Norman F San Carlos, CA 101 9114

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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5,510,797 Provision of SPS timing signals 100 1993
5,521,887 Time transfer system 43 1993
5,625,556 Accurate time standard for vehicle operation 23 1995
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NAVSYS CORPORATION (2)
5,225,842 Vehicle tracking system employing global positioning system (GPS) satellites 415 1991
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ALLEN TELECOM LLC (1)
5,317,323 Passive high accuracy geolocation system and method 231 1993
 
Combustion Engineering, Inc. (1)
4,449,830 Method and apparatus for measuring elapsed time between an initiating event and a dependent event 19 1981
 
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MAGNAVOX ELECTRONIC SYSTEMS COMPANY (1)
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MESC ELECTRONIC SYSTEMS, INC. (1)
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NORTHROP GRUMMAN SYSTEMS CORPORATION (1)
5,570,097 Retransmitted GPS interferometric system 21 1995
 
RADIX TECHNOLOGIES, INC. (1)
5,420,592 Separated GPS sensor and processing system for remote GPS sensing and centralized ground station processing for remote mobile position and velocity determinations 204 1993
 
RAYTHEON COMPANY (1)
5,117,232 Global system positioning receiver 40 1991
 
SNAPTRACK, INC. (1)
5,812,087 Method and apparatus for satellite positioning system based time measurement 300 1997
 
The United States of America as represented by the Administrator of the National Aeronautics and Space Administration (1)
4,445,118 Navigation system and method 510 1981

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
TELECOMMUNICATION SYSTEMS, INC. (44)
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8,150,363 Enhanced E911 network access for call centers 5 2006
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7,965,222 Cellular augmented radar/laser detector 4 2010
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CSR TECHNOLOGY INC. (34)
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7,995,683 Noise floor independent delay-locked loop discriminator 0 2007
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7,969,351 Mode determination for mobile GPS terminals 0 2007
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7,551,129 Virtual real-time clock based on time information from multiple communication systems 5 2006
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UBE INDUSTRIES, LTD. (2)
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ATC TECHNOLOGIES, LLC (1)
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CSR PLC (1)
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Other [Check patent profile for assignment information] (2)
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