Abstract
This paper discusses design details and field test verification results of a low-cost Radio Frequency Interference (RFI) event logger developed for monitoring the Global Navigation Satellite System (GNSS) L1 and L5 frequency bands for anomalous emissions that might disrupt or degrade Ground Based Augmentation System (GBAS) operation. On-going system evolution in support of simultaneous coverage of all present and upcoming L-band GNSS signals is also presented.