In less than 18 months from contract award, Sensis Corporation’s Multistatic Dependent Surveillance (MDS) multilateration is now fully operational at Stockholm-Arlanda Airport.  The system is fully integrated into Arlanda’s Advanced – Surface Movement Guidance and Control System (A-SMGCS) to provide air traffic controllers with improved situational awareness for safety and increased capacity. Sensis MDS uses multiple low-maintenance, non-rotating sensors to triangulate aircraft location based on transponder signals and supply 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 surface movement radar, Sensis MDS provides consistent, accurate surveillance performance.  MDS’ architecture and advanced multi-path elimination algorithms result in precise surveillance using the optimal number of ground stations for reduced cost and complexity.  Additionally, every MDS sensor supports Automatic Dependent Surveillance – Broadcast (ADS-B) for easy migration to future technologies. More than 50 airports worldwide rely on Sensis technology as a critical component of a complete Advanced Surface Movement Guidance and Control System solution.  Additionally, Sensis multilateration is being used for Wide Area Surveillance in the United States, Canada, Austria and Australia.