US Patent No: 4,457,006

Number of patents in Portfolio can not be more than 2000

Global positioning system receiver

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Importance

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Abstract

In a Global Positioning System type of navigation system, a biphase modulated radio frequency input signal is applied to the "front end" of a double heterodyne receiver having a second intermediate frequency stage which operates in the audio frequency range. The audio output signal is phase locked to a 1 KHz reference signal and is applied to a microprocessor for processing via an interface circuit which includes a relatively simple amplitude detector and a novel biphase detector. The microprocessor also controls the phase shifting of a pseudorandom noise code generator whose output is modulated with the output of the first intermediate frequency stage of the receiver.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
SP-MARINE, INC.DETROIT, MI30

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Maine, Reuben E Charlottesville, VA 6 78

Cited Art

Patent Info (Count) # Cites Year
 
HEWLETT-PACKARD COMPANY (1)
4,198,604 Heterodyne phase lock system 24 1977
 
NEC CORPORATION (1)
2002/0114,513 Color image processing device and color image processing method 1 2002

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
SNAPTRACK, INC. (13)
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5,831,574 Method and apparatus for determining the location of an object which may have an obstructed view of the sky 183 1996
5,841,396 GPS receiver utilizing a communication link 347 1996
6,208,290 GPS receiver utilizing a communication link 136 1997
5,781,156 GPS receiver and method for processing GPS signals 264 1997
6,061,018 Method and system for using altitude information in a satellite positioning system 209 1998
6,064,336 GPS receiver utilizing a communication link 251 1998
6,272,430 GPS receiver and method for processing GPS signals 70 1998
6,016,119 Method and apparatus for determining the location of an object which may have an obstructed view of the sky 170 1998
6,307,504 Method and system for using altitude information in a satellite positioning system 87 2000
6,421,002 GPS receiver utilizing a communication link 107 2001
6,542,821 GPS receiver and method for processing GPS signals 61 2001
6,725,159 GPS receiver and method for processing GPS signals 60 2003
 
SONY ERICSSON MOBILE COMMUNICATIONS AB (4)
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7,453,956 Apparatus, methods and computer program products for signal acquisition using common demodulation templates 0 2004
7,358,897 Apparatus, methods and computer program products for GPS signal acquisition using an adaptive search engine 0 2004
 
TRIMBLE NAVIGATION LIMITED (4)
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5,650,785 Low power GPS receiver 132 1994
5,825,887 Transmitting and receiving apparatus for full code correlation operation under encryption for satellite positioning system 44 1995
5,815,539 Signal timing synchronizer 19 1996
 
NOVATEL INC. (3)
5,101,416 Multi-channel digital receiver for global positioning system 119 1990
5,414,729 Pseudorandom noise ranging receiver which compensates for multipath distortion by making use of multiple correlator time delay spacing 191 1993
5,390,207 Pseudorandom noise ranging receiver which compensates for multipath distortion by dynamically adjusting the time delay spacing between early and late correlators 133 1994
 
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MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (2)
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CAPETRONIC (BSR) LTD. (1)
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5,706,307 Method and arrangement for the determination of the ratio for common-channel or adjacent-channel interferers in digital mobile communication networks 1 1995
 
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6,968,737 Position determining system using transmitted position information 2 1997
 
MITAC INTERNATIONAL CORP. (1)
5,347,546 Method and apparatus for prefiltering a global positioning system receiver 40 1992
 
MOTOROLA MOBILITY LLC (1)
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MOTOROLA, INC. (1)
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NOVATEL COMMUNICATIONS LTD. (1)
5,495,499 Pseudorandom noise ranging receiver which compensates for multipath distortion by dynamically adjusting the time delay spacing between early and late correlators 73 1995
 
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QUALCOMM INCORPORATED (1)
6,400,314 GPS receiver utilizing a communication link 99 2000
 
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7,590,196 Chiral mixture detection system using double reference lock-in detector 2 2005
 
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OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (1)
H2155 Downconvert and average identification of biphase coded signal carrier 1 2002