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Collision Threat Parameters

Published online by Cambridge University Press:  23 November 2009

S. Ratcliffe
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Extract

Lenart derives boundaries of a Collision Threat Parameters Area (CTPA), which defines the range of velocity and heading which own vessels must not adopt if it wishes to maintain a specified minimum spacing from a given threat. Lenart's treatment of the problem is algebraic, and a geometric demonstration of the validity of the CTPA boundaries may be of interest.

In Fig. 1, O is the position of own vessel. OX and OY are Cartesian axes, fixed in direction as own vessel manoeuvres. T is the position of a threat, whose velocity is represented on the diagram by a line TT´ whose length gives the distance the threat will travel, relative to own vessel's present position, in some time τ, 0·2 hours, say.

Type
Forum
Information
The Journal of Navigation , Volume 37 , Issue 1 , January 1984 , pp. 139 - 140
Copyright
Copyright © The Royal Institute of Navigation 1984

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References

REFERENCES

1Lenart, A. S. (1983). Collision Threat Parameters for a radar display and plot technique. This Journal, 36, 404.Google Scholar