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Fast acquisition of GPS signal

  • US 6,778,136 B2
  • Filed: 12/13/2001
  • Issued: 08/17/2004
  • Est. Priority Date: 12/13/2001
  • Status: Expired due to Term
First Claim
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1. An apparatus, comprising:

  • a receiver in receipt of a signal having a plurality of pseudo noise codes which each of the pseudo noise codes of the plurality of pseudo noise codes originates from a GPS transmitter;

    a local clock with an error of less than 0.5 ms relative to a GPS time; and

    a decoder connected to the receiver and the local clock which is synchronized to the signal, identifies at least four pseudo range equations for at least four GPS transmitters from the plurality of GPS transmitters, and determines a location of the receiver by simultaneously solving the four pseudo range equations where the at least four pseudo range equations have terms associated with propagation delay of chips and when the at least four pseudo range equations are solved for position and time, and the at least four pseudo range equations are within 0.5 ms of a prior solution.

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