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Global positioning system receiver

  • US 7,026,985 B2
  • Filed: 01/15/2002
  • Issued: 04/11/2006
  • Est. Priority Date: 01/15/2002
  • Status: Expired due to Fees
First Claim
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1. A global positioning system receiver for performing both navigation and correlation functions, comprising:

  • (a) a radio frequency down converter;

    (b) a programmable digital signal processor;

    (c) a signal processing unit in communication with and residing within said programmable digital signal processor for performing signal correlation, wherein said signal processing unit further comprises;

    (1) a correlator for generating correlation values by simultaneously performing signal acquisition and tracking;

    (2) a correlator manager connected to said correlator for generating pseudorange and doppler measurements and extracting navigation messages;

    (3) a channel manager connected to the correlator for assigning channels in the correlator;

    (4) a measurement data processor connected to said correlator manager for validating the measurement data through the filtering of pseudorange and doppler measurements;

    (d) a navigation processing unit in communication with and residing within said programmable digital signal processor for performing navigation functions, wherein said navigation processing unit further comprises;

    (1) a user position computation module for obtaining the position, velocity and time by receiving the measurements from said measurement data processor;

    (2) a satellite position compute module connected to user position estimation module for computing the position and velocity of the satellites; and

    (3) visibility computation and satellite selection module connected to said channel manager for generating the list of visible satellites required by said channel manager, based on the position estimates;

    whereby the integration of the navigation and correlation functions in the programmable digital signal processor obviates the need for a separate hardware correlator, the power consumption is reduced as a result of a fewer number of hardware components, and the ability to change the sampling frequency by programming the digital signal processor chip enables the programmable digital signal processor to interface with any type of the radio frequency down converter.

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