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Simplified Methods of Position Fixing Using Earth Satellites

Published online by Cambridge University Press:  18 January 2010

Extract

The possibilities of using the measurement of the ranges to a pair of satellites to give an observer his position have been extensively studied, and expressions giving latitude and longitude have been derived. These since they involve powers of the fourth order are somewhat cumbersome, but given the appropriate computer on his craft an observer at a known distance from the centre of the Earth can obtain track data by measuring the ranges and continuously calculating his position. Alternatively, he may measure the incremental changes in these quantities from their value at the starting point which avoids (if a synchronous time or frequency technique is used) the necessity for continual two-way exchange of signals between the craft and the satellite, but the real-time solution of relatively complicated equations still has to be done.

Type
Research Article
Copyright
Copyright © The Royal Institute of Navigation 1971

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References

REFERENCES

1Wright, T. M. B., U.S. Patent No. 3430234; U.K. Patent 1084110. Navigation by means of Earth Satellites.Google Scholar
2Navigation Systems: a review of Modern Electronic Aids. Chapter 12. Satellite Aided Navigation (Ed. Beck, G. E.). Van Nostrand Co.Google Scholar
3Flight International (Avionics column), July 1971.Google Scholar
4Flight International (Area navigation: Is there a simple answer?), 3 December 1970.Google Scholar