Sensis to Provide Multilateration at Schiphol International Airport

DEWITT, NY - May 22, 2002 - Sensis Corporation has signed a contract with Air Traffic Control the Netherlands (LVNL) for the supply of its Multilateration / Multistatic Dependent Surveillance (MDS) System as part of Schiphol International Airport’s Advanced Surface Movement Guidance and Control (A-SMGCS) program. 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.

Schiphol is the 4th busiest airport in Europe with 433,000 movements in 2001, closely following Frankfurt and Heathrow Airports. The Sensis MDS system will provide coverage of the entire airport -- runways, taxiways, ramp and gate areas. Sensis is also providing a test system, which can be used to evaluate any and all parameter changes without interruption of the operational system.. Sensis will also supply two Mode-S vehicle location units, called Veelos, that enable trials through tracking and positive identification of equipped vehicles on the airport’s surface.

Sensis Vice President Ken Tollstam, speaking on the importance of this contract, said "LVNL runs a world-class operation. Their selection of the Sensis MDS system boosts our position as the world's leading supplier of next-generation surveillance system for air traffic control." Tollstam further commented, "Sensis is delighted to add Schiphol to our growing list of MDS sites which includes the top four European airports."

The Sensis MDS system locates and identifies targets by utilizing small sensors on the airport surface that listen for transponder signals and triangulate them to determine the position of the signal's source. The transponder signals include encoded 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.

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.