Opportunistic RSS-based localisation using SDR and ADS-B system

Nowadays, a growing increase in air traffic and regulatory directions are leading to using transponders compatible with ADS-B Mode S technology. This scenario means an increase in signal availability that provides helpful information for the location process. Like GNSS, aircraft send their position through Top and Bottom interfaces. This work proposes an SDR receiver and an opportunistic localisation method based on RSSI measurements combined with communication channel estimation. The results demonstrate an improvement in distance estimation through a set of techniques based on statistical analysis, outlier filtering and classification of received messages. The performance analysis of the proposed solution includes an analysis of the impact of Sampling Frequency and yields an error lower than 0.8 Km using a 2-minute processing window.