relation: http://miis.maths.ox.ac.uk/miis/35/ title: National Air Traffic Services creator: Budd, Chris creator: Hill, Andrew creator: Andre Leger, Andre subject: Transport and Automotive subject: Aerospace and defence subject: Information and communication technology description: National Air Traffic Services (NATS) are concerned with ensuring low probabilities of errors in determining aircraft positions. In general, error probabilities depend on the tails of some probability distributions for which there has been no theoretical model. Analysis of radar performance is regularly undertaken by NATS to ensure radar performance is within safety limits, with the maximum range being dependent on the declared separation between aircraft. NATS brought two questions to the Study Group, involving the horizontal (azimuthal) errors in radar data and the vertical errors in altimetry system data. In both cases, NATS asked the Study Group to analyse the data and assess whether the probability distributions that are currently used are good models for the errors. date: 2004-11-23 type: Study Group Report type: NonPeerReviewed format: application/pdf language: en identifier: http://miis.maths.ox.ac.uk/miis/35/1/NATS.pdf identifier: Budd, Chris and Hill, Andrew and Andre Leger, Andre (2004) National Air Traffic Services. [Study Group Report] relation: http://www.smithinst.ac.uk/Projects/ESGI49/ESGI49-NATS/Report/NATS.pdf