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What are these dilution parameters PDOP, TDOP, and GDOP saying?

dilution parameters
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What are these dilution parameters PDOP, TDOP, and GDOP saying?

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These parameters qualify the accuracy of a GPS receiver. The following is a translation of an explanation given by Martin Burnicki: “The dilution values have no units, and they are computed from the position of the satellites relative to the position of the receiver’s antenna. Small values express high precision. The values are computed using an inversion of a 4×4 matrix containing the cosinus values of the angles between the antenna and the satellites.

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