NMEA and UAV Flight Data for Multi-Constellation GNSS Evaluation: GPS, Galileo, NavIC, and BeiDou

This dataset contains raw Global Navigation Satellite System (GNSS) logs collected from both static ground-based and dynamic UAV-based experiments. Data includes measurements from GPS, Galileo, and NavIC modules under stationary conditions, as well as GPS and BeiDou modules mounted on a quadcopter platform during autonomous flight. The dataset provides NMEA 0183 sentences (GGA, GLL, GSV, GSA) along with processed CSV files containing positional accuracy metrics (HDOP, VDOP, PDOP, CEP, 2DRMS, 3DRMS), signal-to-noise ratio (SNR), and trajectory data. It is intended to support research in GNSS performance analysis, UAV navigation, and multi-constellation integration.