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Why is it called "Geometric Dilution of Precision" and not "covariance matrix"? In what ways is the former not the latter?
by uoaei 5y ago
Why is it called "Geometric Dilution of Precision" and not "covariance matrix"? In what ways is the former not the latter?
- jvanderbot 5y agoGDOP is sometimes taken to mean the largest eigenvalue or trace of the covariance matrix. It's a metric for the badness of the estimate. Often, GDOP is broken into components HDOP, VDOP, etc for the values corresponding to some earth-fixed coordinate frame. That starts to look more like statistics about the covariance matrix. Here's a derivation: https://en.wikipedia.org/wiki/Dilution_of_precision_(navigation) https://en.wikipedia.org/wiki/Dilution_of_precision_(navigat... Here, it ends up being (usually) the sqrt(trace(covariance))