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Complete radio navigation receiver, particularly of the GPS type

  • US 6,175,725 B1
  • Filed: 10/02/1998
  • Issued: 01/16/2001
  • Est. Priority Date: 10/02/1997
  • Status: Expired due to Fees
First Claim
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1. A device for reception of radio-electrical signals comprising a modulated carrier-wave, and equipped with a repetitive time marker, of the pseudo-random code type, with particular reference to radio-navigation, where the device comprises high-frequency reception, which produces a wanted signal with several coincidence modules, each of which is allocated to a time offset in relation to a selected respective radioelectrical signal, and means for analysis of the time offset data supplied by these coincidence modules, and wherein each coincidence module comprises:

  • chronometric memory media suitable for storage in the form of time offset data of a code offset estimate and a frequency carrier-wave status and phase estimate, and the corresponding deduction, with a local clock, of a local carrier-wave image and at least one local repeat of the code for the relevant radioelectrical signal, and code and carrier-wave slaving functions operating by correlation between the wanted signal and the local code repeat, and also by means of a frequency and phase offset signal between the carrier-wave present in the wanted signal and the said carrier-wave image for purposes of bringing about coincidence between the local code repeat and the received code, wherein said device comprises Fourier transformation media receiving the carrier-wave frequency and phase offset signal and decision-making media which are capable of invalidating, at least partially, the time offset data where the Fourier transformation indicates the presence of energy outside of the vicinity of a central line corresponding to coincidence, which provides an indication of the presence of multiple paths.

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