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Method of reducing the glare of a receiver within a system, in particular a geolocation system

  • US 8,929,489 B2
  • Filed: 07/01/2011
  • Issued: 01/06/2015
  • Est. Priority Date: 07/01/2010
  • Status: Active Grant
First Claim
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1. A method for reducing a glare of at least one receiver within a geolocation system, the system comprising:

  • at least one first emitter emitting at least one first signal modulated by a first code,at least one second emitter emitting at least one second signal modulated by a repetitive and potentially variable second code and a third signal phase-shifted with respect to the second signal, the third signal being modulated by the second code delayed by a first delay, andthe receiver being configured to detect the signals emitted by the first and second emitters and implementing, for a tracking of the first signal, a local signal, wherein the method comprises;

    a first correlation quantity is calculated for a correlation between the local signal of the receiver modulated by the first code and a signal resulting from a combination of at least the first, second, and third signals,a second correlation quantity is calculated for a correlation between the local signal of the receiver, modulated by the first code delayed by the first delay and the signal resulting from the combination of at least the first, second and third signals, andthe first and second correlation quantities are combined to improve a signal/noise ratio of the first signal received by the receiver while reducing the glare of the receiver by the second signal,wherein the first delay is equal to half a duration of the second code, with a precision of within 1% of a value of half of the duration of the second code and in which a phase shift between the second and the third signal is equal to 180°

    with a precision of within 18°

    .

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