Talk:Dilution of precision (navigation)

message: Do you mean American or Soccer? Do you mean width or length?
American: 110m x 49m, Soccer 45m-90m x 90m-120m.
* All of these linear measurements are within the same order of magnitudes (approx >10m and < 1000m) and as a cultural reference to rough size of "bigness" any would do. (However the offending reference to "Football field" appears to have been removed.) --BrianFennell (talk) 20:21, 19 April 2009 (UTC)
thread_title:  "Football field" ? 

message: If (x - xi)/Ri is meant to be a component of a unit vector (with length of 1 unit) it would seem then the time difference has already been converted to spacial distance for Ri.  If so, why does c (speed of light) appear in the matrix math?  I could see if Ri/c was meant to be meters/(meters/second) giving seconds in the final column (making it a time component), but having c standing out there all on it's own seems inconsistent. (Or am I missing something more basic or more esoteric here?)
Also it would be helpful is a more authortative document was referenced - GPS is a standard, and there must be a standard document for it defining (among other things) GDOP, HDOP, VDOP and PDOP as defined for use in GPS calculations.  --BrianFennell (talk) 20:21, 19 April 2009 (UTC)
thread_title:  c in matrix calculation 

message: GPS GDOP metric - 2000 IEE Proceedings -
:http://www.utdallas.edu/~nxa028000/GDOP.pdf
Dilution of Precision-Based Lunar Navigation Assessment for Dynamic Position Fixing
:http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/38716/1/06-0023.pdf
B.W. Parkinson (Ed) Global Positioning System: Theory and Applications, Vols I and II 1996, AIAA Press.
:  
Matrix Inversion - Ask Dr Math
:http://mathforum.org/library/drmath/view/51680.html -- BrianFennell (talk) 21:23, 19 April 2009 (UTC)
thread_title:  Possible Articles to cite 

message: In section "Computation of DOP values", the first math expression is underlined. Does this have some meaning, that I am not aware of, or is it there by mistake?
Velle (talk) 01:11, 25 March 2010 (UTC)
thread_title:  Underlining of math expression 

message: Have you noticed that the z letters (that are written in math style, and rendered) have lost their diagonal line? Now they look like the approximation symbol. I don't know if this could be fixed somehow, but it sure will confuse some people. 
Velle (talk) 01:23, 25 March 2010 (UTC)
thread_title:  Rendering of italic math style z 

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thread_title:  External links modified 

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thread_title:  External links modified (January 2018) 

message: There's significant overlap between the present article and section Error analysis for the Global Positioning System#Dillution of precision. fgnievinski (talk) 20:54, 13 April 2021 (UTC)
replies: text: I agree. Perhaps we could merge the content into this page, and replace that section with a summary and link to this page? TimSmit (talk) 01:13, 30 April 2021 (UTC)
replies: text: Redirected that section; no unique, relevant, referenced content to merge. Klbrain (talk) 10:07, 22 October 2022 (UTC)
thread_title:  Duplication