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Subject: Re: [Nml] Mathematical Advancement of a celestial COP
WSMurdoch@XXX.XXX
Date: Sun Oct 25 1998 - 17:32:33 EST
I would take a look at four different references.
M.F. A'Hearn and G.S. Rossano, "Two Body Fixes by Calculator", Navigation 9810:
Journal of the Institute of Navigation, Vol 24, No. 1, Spring 1977, p 59-66.
This is a good easy conversion from two sights to a lat/long fix.
J.A. Van Allen, "An Analytical Solution fo rthe Two Star Sight Problem of
Celestial Navigation", Navigation 9810: Journal of the Institute of Navigation, vol
28, No 1 Spring 1981, p 40-43. Much like the paper above, but a little
different.
B.D. Yallop and C.Y. Hohenkerk, "Compact Data for Navigation and Astronomy for
the years 1991-1995" (and I think there is a newer edition), Cambridge
University Press, p x-xxiv. This is the real explaination for the almost un-
understandable instrucitions in the Nautical Almanac. It handles three or
more sights, calculates the lat/long fix inside the cocked hat by a least
squares method, and estimates the errors in the fix. It is the method I used
in my TI-82 program.
George H. Kaplin, "Determining the Position and Motion of a Vessel from
Celestial Observations", Navigation 9810:Journal of the Insititute of Navigation,
Vol 42, No 4, Winter 1995, p 631-648. This is the state of the art. Blow
away. Knowing everything you know; knowing where you are and where you are
going.
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