The Journal of Navigation: Volume 48 -

Long Time-Horizons for Air Traffic Flow Planning in Europe
S. Ratcliffe
Published online by Cambridge University Press:

21 October 2009, pp. 279-288
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In an earlier paper, the writer attempted a quantitative study of a flow-planning system for aircraft intending to fly across Europe. This paper aims to offer each aircraft a clearance giving a reasonable expectation that, throughout cruising flight at least, there will be no conflict with other traffic. Such a clearance is sometimes termed a ‘tube of flight’. Reference i assumed a pattern of traffic flying along rhumb lines, each flight having a starting position chosen at random in a region roughly the size of Europe. Flight was in a random direction and the flight path length was chosen at random from a plausible distribution.

Clarification of the Steering and Sailing Rules of the COLREGS
Hanno Weber
Published online by Cambridge University Press:

21 October 2009, pp. 289-292
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Traffic regulations have to be clear and strict. Only then can navigators ran their vessels safely. As a complete set of simple rules cannot be developed and introduced within the next decade, suggestions are made to improve the existing rules.

A Kalman Filter Model for an Integrated Land Vehicle Navigation System
Allison N. Ramjattan, Paul A. Cross
Published online by Cambridge University Press:

21 October 2009, pp. 293-302
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Unlike in the case of airborne and offshore applications, GPS cannot be used continuously for land vehicle navigation due to the loss of satellite signals by obstructions from buildings, trees, etc. With the increasing trend in various sectors of the economy towards efficient fleet management, the challenges of providing a system capable of providing high-accuracy vehicle position and location anywhere, continuously, has led to renewed interest in the area of integrated navigation systems. In order to satisfy these conditions, an integrated system comprising GPS and gyro/odometer dead reckoning has been developed. This paper gives a description of the implemented system and shows some of the practical results that can be obtained using Kalman filtering algorithms.

Navigation for Masters. By David J. House. 426 pages, 24 × 16 cm, Witherby & Co. Ltd., London, 1995. £35.00.
Alan Bole
Published online by Cambridge University Press:

21 October 2009, pp. 448-449
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Interpretation of S-Curve and Tracking Error in a Delay-Lock-Loop
E. S. Warner, J. D. Last
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21 October 2009, pp. 303-306
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The delay-lock-loop is a device used in direct-sequence spread-spectrum receivers to track the delay difference between two binary correlated waveforms. This short paper aims to clarify both the interpretation of the S-curve and the sign of the tracking error for such devices, especially those for navigation systems such as GPS.

The Journal of Navigation