EGNOS and GALILEO receivers : CW interference effect analysis

From: Pole Star (info_at_polestar-corporate.com)
Date: 07/22/04 

Date: Thu, 22 Jul 2004 14:16:38 +0200

The electromagnetic compatibility between Ultra Wide Band (UWB) devices and
Radio Navigation Satellite Services is an ITU working item to elaborate new
recommendations for the Spectrum Management. UWB appears generally as a
noise floor increase factor, degrading RNSS accuracy. But GNSS receivers can
also experience CW-like interference effects due to power concentrations in
UWB frequency spectrums. Indeed, some UWB devices, foreseen for localisation
or Radar applications, transmit periodic signal.

The signal loss of lock, the interferer tracking, and the large position
error are rather known effects of CW interferers on a GPS receiver. However,
all the parameters which enter in conjunction to cause one effect or the
others have not, up to now, been clearly characterized.

This paper proposed an adapted methodology for electromagnetic compatibility
study, based on a case by case safety analysis, which appears essential to
protect safety of life applications usually involved in Radio Navigation
Satellite Services. A CW interference effect analysis is finally proposed,
investigating the potential susceptibility of EGNOS and Galileo receivers.
.../...

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