TY - JOUR
T1 - GNSS <em>C/N<sub>0</sub></em> degradation model in presence of continuous wave and pulsed interference
JF - NAVIGATION: Journal of the Institute of Navigation
JO - NAVIGATION
SP - 75
LP - 91
DO - 10.1002/navi.405
VL - 68
IS - 1
AU - Garcia-Pena, Axel
AU - Julien, Olivier
AU - Macabiau, Cristophe
AU - Mabilleau,, Mikael
AU - Durel, Pierre
Y1 - 2021/03/20
UR - https://navi.ion.org/content/68/1/75.abstract
N2 - In the Global Navigation Satellite System (GNSS) L5/E5a interference environment, RTCA DO-292 proposes a model to compute the C/N0 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 C/N0 degradation is modeled as a function of the blanker duty cycle, bdc, and the equivalent noise-level contribution of the non-blanked interference, RI. 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 RI and C/N0 degradation are derived. The new formulas are verified through simulations for DME/TACAN signals.
ER -