http://ttraz.wordpress.com Postings regarding the Tucson Trail Run series and related topics. The photo was taken at Palisades trailhead during the Mt. Bigelow run... Sat, 17 May 2008 05:47:42 +0000 http://wordpress.org/?v=MU http://ttraz.wordpress.com/gps-measuring-and-mapping/gps-accuracy-wheres-your-gps-been/#comment-54 jltheobald Thu, 17 Apr 2008 14:13:34 +0000 http://ttraz.wordpress.com/?page_id=174#comment-54 I will add one point here. First, it's not clear that the distribution would be Gaussian (I don't like the word "normal" since I don't think much of the world actually fits that distribution) since you're dealing with bit toggle amongst other processes. I think it might be closer to a mixture of binomial (classic drunken sailor, random walk distribution) and uniform. Well, two points. Second, remember that GPS is a precision position measuring system not a distance measuring system. Third (weak humor). If I remember correctly, you have some trees in your back yard or at least nearby. You might want to try the experiment by placing the unit in the middle of a football field. I would recommend during the night to avoid temperature driven propagation issues. Also, the specific distribution of the satellites will matter and the history of recent correction table updates. I will add one point here. First, it’s not clear that the distribution would be Gaussian (I don’t like the word “normal” since I don’t think much of the world actually fits that distribution) since you’re dealing with bit toggle amongst other processes. I think it might be closer to a mixture of binomial (classic drunken sailor, random walk distribution) and uniform.
Well, two points.
Second, remember that GPS is a precision position measuring system not a distance measuring system.
Third (weak humor).
If I remember correctly, you have some trees in your back yard or at least nearby. You might want to try the experiment by placing the unit in the middle of a football field. I would recommend during the night to avoid temperature driven propagation issues. Also, the specific distribution of the satellites will matter and the history of recent correction table updates.

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