Vienna International Airport Operational with Sensis Airport Surveillance System, MDS

Multistatic Dependent Surveillance Aids in Managing
Record Traffic Increase

DEWITT, NY - September 20, 2004 - Sensis Corporation today announced that Vienna International Airport, Austria, is using Sensis' airport surveillance system, Multistatic Dependent Surveillance (MDS), for operational surface surveillance. By providing high accuracy, high reliability surveillance data regardless of weather conditions, the robust system has aided the airport in safely increasing throughput. In the first six months of 2004, the airport achieved an increase of 14.3 % in flight movements - one million more passengers over the same time in 2003 - setting Vienna on course to break its 2003 record of exceeding 12 million passengers.

"We needed a high-performance product that could address the safety and efficiency challenges associated with Vienna's increasing capacity," said Johann Zemsky, Chief Operating Officer of Austro Control, Austrian Air Navigation Service Provider. "Austro Control anticipates an additional 4% average traffic growth in the next few years, and 8% this year. Further, we are undertaking a major terminal expansion project within the next four years and anticipate a near doubling of the number of passengers served when the project is complete. Not only does MDS enable us to meet our current surveillance needs, it has the flexibility to grow with our airport."

At Vienna International Airport, MDS, a multilateration-based surveillance system, augments existing primary, secondary and surface movement radar. Austro Control selected MDS as a result of the product's "collaborative" surveillance that actively interrogates an aircraft or airport vehicle's transponder and determines position and identity. Additionally, MDS provides surveillance in low visibility conditions where radar often experiences coverage gaps as a result of precipitation; additionally, through multilateration, the system provides controllers with surveillance of areas of the airport surface that are not visible due to building and stand arrangements.

"With its one-second update rate, and active surveillance, MDS provides precision comparable to global positioning systems without any additional aircraft equippage," said Marc Viggiano, president of Sensis' Air Traffic Systems Division. "Further, through its compatibility with developing standards such as Automatic Dependent Surveillance - Broadcast, multilateration provides a bridge to future technologies."

Sensis' multilateration technology is also in operational use for ground surveillance at London Heathrow Airport (England). Further, Sensis MDS is being installed for ground surveillance at six additional European airports - Brussels Airport (Belgium); Frankfurt Airport (Germany); Geneva International Airport (Switzerland); Amsterdam Airport Schiphol (The Netherlands); Charles de Gaulle Airport (France); and Zurich Airport (Switzerland). For enhanced terminal surveillance, Sensis' multilateration technology is being installed at Innsbruck (Austria) and Frankfurt (Germany) Airports. Also, the U.S. Federal Aviation Administration is deploying the Sensis multilateration system to 34 airports as part of the Airport Surface Detection Equipment, Model X (ASDE-X) program.