NAV Portugal has selected Sensis’ Multistatic Dependent Surveillance (MDS) for surface surveillance at Lisbon Airport.  The system will enhance safety on the ground and provide accurate surveillance out to five nautical miles from the airport to improve efficiency. “There are a number of important factors we weighed in making the selection for the Lisbon multilateration project, specifically technical performance, price, delivery schedule and past performance,” said Sofia Azevedo, head of communication and image, NAV Portugal. “Sensis’ solution offers the strongest combination of these factors, particularly their proven history of deploying multilateration systems for ANSPs around the world and their record of technical performance.” Sensis MDS uses multiple low-maintenance, non-rotating sensors to triangulate aircraft location based on transponder signals and provides air traffic controllers with precise aircraft position and identification information regardless of weather conditions.  With a higher update rate and greater positional accuracy than traditional radar, Sensis MDS provides consistent, accurate surveillance.  MDS’ architecture and advanced multi-path elimination algorithms means the optimal number of ground stations is used reducing cost and complexity.  Additionally, each MDS sensor supports Automatic Dependent Surveillance – Broadcast (ADS-B).