A Gnss Anti-Interference System Based on Array Antenna Directional Mismatch

The Global Navigation Satellite System (GNSS), radar and sonar face increasingly severe interference issues in complex environments. In environmental observation, remote sensing and communication, array antennas are gradually replacing traditional single antennas due to their higher gain, narrower beamwidth, and excellent anti-interference. However, the impact of the antenna direction on interference mitigation has been neglected by researchers. This paper presents a novel anti interference system based on the directional mismatch of array antennas. The system incorporates a numerical model of the antenna's non-uniform pattern and frequency deviation, enabling researchers to investigate the impact of these characteristics on anti-interference performance. The system supports various array antenna models and anti-interference algorithms, facilitating comparative analysis and algorithm development. Currently, it has been integrated into the RF front-end of the GNSS receiver, and in the future, it will be combined with radar and sonar systems to form a multi-source fusion sensor. Simulation and experimental results demonstrate the system's effectiveness, which the PI algorithm outperforms other criterions with anti-interference exceeding 80 dB, offering robust support for the advancement of multi-domain fusion of sensors.