TéSA’s GNSS day took place on July 10th 2019. Pau Closas, a visiting researcher from Northeastern University (Boston, USA), presented a one-day seminar on robust GNSS receivers, with a contribution from DLR’s Daniel Medina. There were about thirty attendees to this event, during which were presented a range of interference types met in GNSS, as well as the various recent algorithms allowing to fight these threats.