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Codeless GPS positioning method and apparatus for such codeless positioning

  • US 5,821,898 A
  • Filed: 03/13/1996
  • Issued: 10/13/1998
  • Est. Priority Date: 03/13/1995
  • Status: Expired due to Fees
First Claim
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1. A codeless GPS positioning method, in which method a unit to be positioned receives GPS signals from several satellites, BPSK modulated codes of the GPS signals are removed, and detected and measured carrier frequencies of the satellites are transmitted from the unit for the purpose of determining the position and/or velocity of said unit to be positioned, wherein the carrier signal frequencies are detected by digitizing the GPS signals before the codes are removed, and processing the digitized signals through a phase-locked loop, and the thus detected signals are transmitted in digital format from the unit for further processing, wherein the phase-locked loop includes a fourth-order phase-locked loop.

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