INS
GUI User’s Manual
Inertial Labs, Inc
TM
Address: 39959 Catoctin Ridge Street, Paeonian Springs, VA 20129 U.S.A.
Tel: +1 (703) 880-4222, Fax: +1 (703) 935-8377 Website: www.inertiallabs.com
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4.5. Magnetometers calibration options
The Inertial Labs INS software allows compensation of influence of the
carrier object hard and soft iron on the heading angle calculation accuracy.
For this purpose, calibration of the INS magnetometers is provided. It is
necessary to set group of parameters “Magnetomers field calibration”. For
this purpose select “Magnetometers calibration options…” from the
“Options” menu (Fig. 3.7) or click button (Fig. 3.1). A “Magnetomers
calibration options” dialog box (Fig. 4.27) will be opened that allow you to
set the lever of the INS mounting relative to the center of the object Swaying
(usually this is object center of gravity).
Fig. 4.27
Start with – specifies with what set of calibration parameters the INS
starts. There are three sets: “Last INS Clb”, “Factory Clb”, “2D-2T,
3D,VG3D, 2D Clb”. Usually “Start with” parameter is set automatically after
last calibration performed.
Mag Disp threshold (nT^2) specifies calibration data that should be
deleted from calibration procedure because of INS was not moved at this
procedure. Default value 1000 nT
2
is set by developers and can be changed
after agreement with them.
Inclination threshold (deg) is valid for 2D and 2D-2T calibration
types and determines acceptable pitch and roll deviation from their median
in the calibration run. INS data over this threshold are not used at calculation
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