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A Radar Computer for the Closest Point of Approach

Published online by Cambridge University Press:  18 January 2010

P. G. Tarnowski
P. G. Tarnowski
Affiliation:
(Admiralty Surface Weapons Establishment)
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Extract

The paper describes an experimental analogue computer used with a civil marine radar set for determining the closest point of approach of selected ship's echoes and the time to closest approach. The equipment was installed on shore and measurements made of shipping passing to and from Portsmouth and Southampton harbours. The projected track of a ship echo was displayed on a 5-in. diameter cathode ray tube and the closest point of approach read as the distance of this track from the centre of the tube. The results show a high probability that under these conditions errors in C.P.A. will not exceed ±0·5 n.m. for targets between 10 and 6 n.m. range, and ±0·3 n.m. for targets nearer than 6 n.m.

Type
Research Article
Information
The Journal of Navigation , Volume 18 , Issue 3 , July 1965 , pp. 355 - 365
Copyright
Copyright © The Royal Institute of Navigation 1965

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