RT Journal Article
SR Electronic
T1 Multi-Parameter Adaptive Notch Filter (MPANF) for Enhanced Interference Mitigation
JF NAVIGATION: Journal of the Institute of Navigation
JO NAVIGATION
FD Institute of Navigation
SP navi.570
DO 10.33012/navi.570
VO 70
IS 2
A1 Johannes Rossouw van der Merwe
A1 Iñigo Cortés
A1 Fabio Garzia
A1 Alexander Rügamer,
A1 Wolfgang Felber
YR 2023
UL https://navi.ion.org/content/70/2/navi.570.abstract
AB Interference signals degrade global navigation satellite system (GNSS) performance and must be mitigated. Chirp signals can be mitigated with an adaptive notch filter (ANF), but the dynamic behavior limits performance. An ANF determines the instantaneous frequency and removes interference with a notch filter. However, there are several limitations. In this article, we propose a multi-parameter adaptive notch filter (MPANF) approach that significantly enhances conventional ANFs. First, it uses an loop-bandwidth control algorithm (LBCA) to alter the loop bandwidth of an frequency-locked loop (FLL)-based adaptation algorithm to facilitate superior tracking agility-to-precision trade-off. Second, it dynamically adjusts the notch depth to switch on interference mitigation or pass the signal through. Third, it modifies the notch width to accommodate tracking stability and optimize interference signal suppression to GNSS signal removal. The presented MPANF exhibits superior performance against chirp signals, including faster response to jump discontinuities.