Coverage and performance predictions for the North-West European Loran-C system
Article Abstract:
In 1991 six European nations, Denmark, France, Germany, Ireland, the Netherlands and Norway, agreed to co-operate in deploying a Loran-C system to cover North-West Europe and the North Atlantic Ocean. The system will comprise 9 stations arranged in 4 chains. In estimating the coverage which will be provided, the effects of signal attenuation, atmospheric noise, carrier-wave interference, skywave propagation, the change of envelope-to-cycle difference with range and transmitter timing uncertainty, have all been taken into account. Contours of repeatable accuracy have been predicted for both conventional hyperbolic receivers, which employ the signals of a master and two secondary stations of a single Loran-C chain, and receivers which work in the semi-circular, cross-chain and master-independent modes. A standard receiver with specified bandpass, notch filter and tracking loop characteristics has been adopted as the basis for coverage and performance assessment. Further, a rigorous search was carried out for group repetition interval (GRI) values which minimised the numbers of synchronous and near-synchronous interferers in the area covered by each chain. The very substantial variations of coverage with choice of GRI were explored and optimal GRI values selected. (Reprinted by permission of the publisher.)
Publication Name: SIMULATION
Subject: Engineering and manufacturing industries
ISSN: 0037-5497
Year: 1993
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How swifts control their glide performance with morphing wings
Article Abstract:
The aerodynamic and structural performance of actual swift wings, as measured in a wind tunnel is described and on this basis a semi-empirical glide model is built. By measuring inside and outside swifts behavioural envelop, it is also presented that choosing the most suitable sweep halve sink speed or triple turning rate.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2007
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GERMANY: SAAR-BANDSTAHL GETS QS 9000 CERTIFICATE
Article Abstract:
In addition to the DIN ISO 9002 certificate, German Saar-Bandstahl GmbH of Volklingen, a producer of cold-rolled steel strips, also obtained the QS 9000quality management certificate on 08 Mar 1999.
Publication Name: Stahl & Eisen
Subject: Metals, metalworking and machinery industries
ISSN: 0340-4803
Year: 1999
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