Sensis Selected to Install Multilateration/MDS System at Vienna International Airport

DEWITT, NY - May 20, 2002 - Austro Control has selected Sensis Corporation to provide a Multilateration/Multistatic Dependent Surveillance (MDS) system at Vienna International Airport. The Sensis MDS system utilizes transponder multilateration and automatic dependent surveillance - broadcast (ADS-B) to provide advanced air and surface surveillance. It is designed to help increase the safety, capacity, and efficiency of all airport surface operations.

The Sensis MDS system locates and identifies targets by utilizing small sensors on the ground that listen for transponder signals and triangulate them to determine the position of the signal's source. The transponder signals are also encoded with aircraft data which the sensors decode and provide to air traffic controllers. Traditional transponders typically provide aircraft identification and altitude information. Advanced Automatic Dependent Surveillance Broadcast (ADS-B) transponders also broadcast latitude, longitude, velocity and heading information - as determined by the on-board avionics and the Global Navigation Satellite System. Reduced power requirements, lack of rotating parts, scalability, and redundancy all make the MDS multilateration system a cost effective alternative, or addition to, traditional radar systems.

Vienna International Airport is the “gateway” to Eastern Europe, with 207,000 movements in 2000. This will be the seventh European airport to select the Sensis MDS system for surface surveillance. The other six are Frankfurt International in Germany, London Heathrow in England, Charles de Gaulle in France, Zurich and Geneva in Switzerland, and Schiphol International in the Netherlands.

Sensis Corporation provides sensors and information technology to the world's militaries, civil aviation authorities, airports and airlines. The company designs, manufactures and installs multilateration/ADS-B ground stations for air and surface surveillance, and sensor data interface equipment for integrating new and legacy, surveillance and automation systems. Sensis equipment is deployed around the world, including more than 100 multilateration/ADS-B sensors and 800 data interface devices in 25 countries on five continents.