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Fri, Mar 12, 2010

Wide Area Multilateration Improves North Sea Helicopter Traffic Safety

Air Traffic Controllers Can Now Pinpoint Location Of Flights

NATS Services is now using Sensis Corporation's Wide Area Multilateration (WAM) system in the North Sea off the coast of Scotland for helicopter flight following. Air traffic controllers are using the WAM surveillance information as a supplement to established procedural flight rules until the WAM system completes testing and regulatory approval for flight information services later this year.

There are more than 25,000 helicopter flights carrying a half million passengers each year between Aberdeen Airport and the oil and gas operations in the North Sea. Low-level radar coverage only extends 80 miles off the shore, forcing controllers to rely on pilot's positional radio updates provided every 10 minutes. In addition, established in-bound and out-bound flight paths are, in many cases, not the most efficient routes due to the lack of surveillance. To improve safety and efficiency, NATS Services required a solution that provided high accuracy surveillance that was compatible with future technologies such as Automatic Dependent Surveillance - Broadcast (ADS-B). NATS Services selected Sensis WAM to cover 25,000 square miles of the North Sea with multilateration sensors placed on 16 oil platforms. One of the platforms is floating, making the development of the solution more challenging.

"Flight safety in the North Sea is of the highest importance to NATS Services and, to enhance it further we needed a proven surveillance solution," said John Mayhew, NATS Services' General Manager at Aberdeen. "With Sensis WAM, controllers have radar-like surveillance to accurately monitor and identify helicopters, in many cases all the way to the flight deck on the oil platform."

Sensis WAM uses multiple low-maintenance, non-rotating sensors to triangulate aircraft and helicopter locations based on transponder signals to provide 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 multilateration provides effective surveillance for increased safety, capacity and efficiency of airspace. With its advanced processing techniques, a Sensis multilateration system uses the minimal number of sensors for a less complex, lower lifecycle cost solution. Additionally, each multilateration sensor deployed by Sensis supports ADS-B.

"Sensis WAM addresses NATS Services' need for a highly accurate, reliable surveillance system that has the flexibility to use ADS-B, Mode S or Mode A/C signals," said John Jarrell, vice president and general manager of Sensis Air Traffic Systems. "In addition, the robust system has the ability to process data from fixed and non-fixed sensors - which is important as one of the platforms experiences positional changes of up to 100 meters."

FMI: www.sensis.com, www.nats.co.uk

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