Ashtech ProMark 200 Especificaciones descargar pdf (Pagina 42)

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kind of project, the calibration step should then be performed

in the first place.

Using the Calibration function is a two-step procedure:

1. First you visit each of the known points with your rover,

and when you are there, you enter the known coordinates

in the unknown local system. In the background, the rover

will associate the “fixed” RTK position computed in real

time with the coordinates you enter.

2. Then, when enough points have been logged and the post-

fit residuals are all zero or close to zero (meaning the local

system has been determined successfully), make the local

system the new coordinate system used in the job. The

properties of the job will show that a “fitted” system,

instead of the original one, is now used in the job.

Follow the instructions below to determine the local

coordinate system:

• Create a new job.

• Choose a coordinate system (ENH axis system) that is

suitable for your working area, with a projection that will

stay unchanged in the local coordinate system, once

determined (XYZ axis system). The calibration function is

inaccessible if the selected coordinate system does not

use a projection.

• Take the necessary steps to get a “fixed” position solution

from your rover.

• Go to the first known point and stay static on that point.

• Select Menu > Calibration and tap on the Add button.

• Enter the point ID and its coordinates, as known in the

local system.

You may either select the point from the list of points

stored in the job (using the on-screen Select Point button)

or directly type in the point ID and its coordinates in the

corresponding fields if this point is not available from the

list of points.

Tell ProMark Field if that point provides reference

coordinates either horizontally or vertically, or both (both

by default).

The coordinates of your current location, as computed by

the rover (a fixed solution) can be read on the GNSS

Coordinates tab.

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Ashtech ProMark 200 Especificaciones Pagina 42

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