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The Use of Self-contained Range and Azimuth Measuring Apparatus to Detect Collision Courses

Published online by Cambridge University Press:  18 January 2010

J. S. Morrel
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Some readers of the January issue of the Journal may have noticed rather strongly discrepant statements on the subject of self-contained detection devices in the several papers on collision avoidance. For example, on page 43 Gaudillère suggests either constant bearing or constant closing speed as an indicator of impending collision between aircraft; and on pages 82–87 Whitfield and Cade suggest that ships may determine transverse velocity (and hence may identify a collision course) by using a differentiated doppler radar return. But on pages 25–26 the author of this note states that the derivatives of range and azimuth required for this use are in fact too small for successful physical measurement.

Type
Forum
Information
The Journal of Navigation , Volume 11 , Issue 3 , July 1958 , pp. 318 - 321
Copyright
Copyright © The Royal Institute of Navigation 1958

References

REFERENCES

1Gaudillère, P. (1958). Visual and electronic methods of preventing collision. This Journal, 11, 40.Google Scholar
2Whitfield, H. R. and Cade, C. M. (1958). A doppler collision course indicator for use at sea. This Journal, 11, 81.Google Scholar
3Morrel, J. S. (1958). The mathematics of collision avoidance in the air. This Journal, 11, 18.Google Scholar