Zenith Beamforming with Antenna Array for GNSS Interference Mitigation: the Winning Solution of the EUSIPCO 2025 Phased Array Signal Processing Student Challenge

• Jammertest’s dataset Norway 2024 compaign, data collected through an antenna array • PRN-noise like jammer with increasing power over time • Detection, localization and mitigation granted during the processing • Beamforming techniques such as MUSIC, MPDR are used for DoA estimation and mitigation • Winning solution of the 2025 EUSIPCO student challenge Global Navigation Satellite Systems rely on estimating the signal propagation delay and Doppler shift to a set of visible satellites, which in turn allows to determine the receiver position, velocity and timing. However, the presence of interfering signals degrades the estimation of such synchronization parameters, reason why robust solutions must be accounted for. One specific kind of interference is jamming, where a powerful signal is emitted in the same bandwidth as the signal of interest. One possible way to mitigate jamming is to resort to an antenna array. Doing so, spatial diversity can help to estimate the most powerful signal, allegedly the interference, and perform detection, localization and mitigation. In our solution, we propose two methods: the first is an offline processing, which uses snapshots where the interference is the most powerful to allow precise detection and localization of the interferer. The second is an online processing, allowing to perform detection, localization and mitigation in real time of the interfering signal.