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ILS-OAS 3

07.05.2015

Submission:

Yes, looking for the mathematical algorithms is indeed what I am looking for. Would be nice to have the document, I guess one can reverse engineer the surface equations given that you have the constants but that can induce error. Will check with NLS on the mentioned document maybe I have some luck p.s. nothing against buying PHX seems a nice piece of software.

Antonio Locandro - COCESNA - GIS Specialist - Honduras

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The 'green pages' OAS constants were derived from an NLR document entitled 'MEMORANDUM IN-81-007 U DESCRIPTION OF PROGRAM BOOKLET FOR THE CALCULATION OF ICAO-OAS DATA" It was dated 1981, and contained a Fortran implementation of the program [BOOKLET], which created the tables. It is quite simple, although the original was severely limited by computer memory and the programming style had some subtle tricks. I am happy to discuss the contents and the mathematics if you want to drop me a line at email: rayrr4-ali at yahoo.com

Ray Romano - Australia

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Answer or Commentary:

I.W.

I think that this information should be open source which would ensure standardisation of the OAS calculation routines used and avoid a situation where versions of the OAS constants are developed locally for internal use.


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