Spectra-precision Survey Pro v4.5 Recon and Nomad Reference Manual Manuel d'utilisateur télécharger pdf (Page 177)

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101

Survey Menu – GPS Module

R-169

• Code: the receiver is calculating a code differential solution

(precision is about 1 to 10 meters).

• Float: the receiver is calculating a carrier phase differential

solution with float ambiguities (precision is typically within

0.1 m to 0.5 m).

• Fixed: the receiver is calculating a carrier phase differential

solution with fixed ambiguities (precision is typically within

15 mm).

H Precision: displays the root mean squared (RMS) error of the

horizontal solution reported by the receiver. It is displayed in project

units.

V Precision: displays the RMS error of the vertical solution reported

by the receiver. It is displayed in project units.

Note: This value is supplied by the receiver, and Survey Pro displays

the receiver’s value without modification. Most manufactures report

this value at the 2 or 3 sigma level. However, since different

manufacturers use different statistical methodology, it is not

necessarily valid to compare the RMS values between brands, or even

between models with different firmware.

HDOP: displays the Horizontal Dilution of Precision. It is a measure

of the geometrical quality of the solution. DOP has no units and

lower numbers indicate better solution geometry.

VDOP: displays the Vertical Dilution of Precision. It is a measure of

the geometrical quality of the solution.

PDOP: displays the Position Dilution of Precision. It is a combination

of HDOP, VDOP and Time Dilution of Precision. It will always be

larger than HDOP and VDOP.

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Spectra-precision Survey Pro v4.5 Recon and Nomad Reference Manual Manuel d'utilisateur Page 177

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