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Dilution of precision (navigation)

Propagation of error with varying topology / From Wikipedia, the free encyclopedia

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Dilution of precision (DOP), or geometric dilution of precision (GDOP), is a term used in satellite navigation and geomatics engineering to specify the error propagation as a mathematical effect of navigation satellite geometry on positional measurement precision.

Understanding the geometric dilution of precision (GDOP) with a simple example. In A someone has measured the distance to two landmarks, and plotted their point as the intersection of two circles with the measured radius. In B the measurement has some error bounds, and their true location will lie anywhere in the green area. In C the measurement error is the same, but the error on their position has grown considerably due to the arrangement of the landmarks.
Navigation satellites with poor geometry for geometric dilution of precision (GDOP).
Navigation satellites with good geometry for geometric dilution of precision (GDOP).