TY - JOUR T1 - Multi-Parameter Adaptive Notch Filter (MPANF) for Enhanced Interference Mitigation JF - NAVIGATION: Journal of the Institute of Navigation JO - NAVIGATION DO - 10.33012/navi.570 VL - 70 IS - 2 SP - navi.570 AU - Johannes Rossouw van der Merwe AU - Iñigo Cortés AU - Fabio Garzia AU - Alexander Rügamer, AU - Wolfgang Felber Y1 - 2023/06/20 UR - https://navi.ion.org/content/70/2/navi.570.abstract N2 - 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. ER -