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Article Dans Une Revue Navigation Année : 2021

GNSS C/N0 Degradation Model in Presence of Continuous Wave and Pulsed Interference

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Olivier Julien
  • Fonction : Auteur
  • PersonId : 961779
Axel Garcia‐pena
Cristophe Macabiau
  • Fonction : Auteur

Résumé

In the Global Navigation Satellite System (GNSS) L5/E5a interference environment, RTCA DO-292 proposes a model to compute the ∕ 0 degradation due to the presence of interference signals, such as Distance Measuring Equipment/TACtical Air Navigation (DME/TACAN), Joint Tactical Information Distribution System/Multifunctional Information Distribution System (JTIDS/MIDS), etc., and due to the application of a temporal blanker to mitigate their impact. The ∕ 0 degradation is modeled as a function of the blanker duty cycle, , and the equivalent noise-level contribution of the non-blanked interference,. However, in RTCA DO-292, the computation of these two terms has a reduced accuracy since a general statistical model of signal pulse collisions and an overbounded flat post-blanker pulsed interference signal Power Spectrum Density (PSD) are assumed. In this paper, the limitations of the applied pulse collisions mathematical model are commented, and the use of true post-blanker pulsed interference signal PSD is introduced through the application of the spectral separation coefficient. As a result, more accurate new formulas for and ∕ 0 degradation are derived. The new formulas are verified through simulations for DME/TACAN signals.
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Axel Javier Garcia Peña, Olivier Julien, Christophe Macabiau, Mikaël Mabilleau, Pierre Durel, et al.. GNSS C/N0 Degradation Model in Presence of Continuous Wave and Pulsed Interference. Navigation, 2021, Navigation, 68 (1), pp.75-91. ⟨10.1002/navi.405⟩. ⟨hal-02987439⟩
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