NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Position lines, crossing
From: Dave Walden
Date: 2006 Dec 11, 17:31 -0800
From: Dave Walden
Date: 2006 Dec 11, 17:31 -0800
Doing a quick monte-carlo, taking a postion, assuming errors are normally distritubted with a stanard deviation of 0.5 min, and lines 120 deg apart, I find 250,562 of 1,000,000 inside the 'cocked hat'. Not surprising. The average distance from the fix to the true position, using the Nautical Almanac method, is 0.51 miles. The standard deviation is 0.27. So, things aren't quite so bad. (The results scale so if the SD error in altude is 5 min, the postion error average is 5.1 miles.) Will try to track 'hat size' as Frank suggests next. --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
