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LMM for the Kodiak 100
190-02102-00 Rev.4
2. Touch the GPS1 button to select the GIA1 GPS receiver. The button annunciator
is green when enabled and subdued when disabled. The system displays the
GPS1 STATUS pane.
3. Touch the GPS2 button to select the GIA2 GPS receiver. The button annunciator
will be green when selected. The system displays the GPS2 STATUS pane.
4.7.3.7.2 Satellite Constellation Diagram
Satellites currently in view are shown at their respective positions on a sky view diagram.
The sky view is always in a north-up orientation, with the outer circle representing the
horizon, the inner circle representing 45° above the horizon, and the center point
showing the position directly overhead.
Each satellite is represented by an oval containing the Pseudo-random noise (PRN)
number (i.e., satellite identification number). Satellites whose signals are currently being
used are represented by solid ovals.
4.7.3.7.3 Satellite Signal Status
Accuracy of the aircraft GPS fix is calculated using Estimated Position Uncertainty
(EPU), Dilution of Precision (DOP), and horizontal and vertical figures of merit (HFOM
and VFOM). EPU is the radius of a circle centered on an estimated horizontal position in
which actual position has 95% probability of laying. EPU is a statistical error indication
and not an actual error measurement.
DOP measures satellite geometry quality (i.e., number of satellites received and where
they are relative to each other) on a range from 0.0 to 9.9, with lower numbers denoting
better accuracy. HFOM and VFOM, measures of horizontal and vertical position
uncertainty, are the current 95% confidence horizontal and vertical accuracy values
reported by the GPS receiver.
The current calculated GPS position, time, altitude, ground speed, and track for the
aircraft are displayed below the satellite signal accuracy measurements.
4.7.3.7.4 GPS Receiver Status
The GPS solution type (ACQUIRING, 2D NAV, 2D DIFF NAV, 3D NAV, 3D DIFF NAV) for
the active GPS receiver (GPS1 or GPS2) is shown in the lower right of the GPS1 and
GPS2 Status Pane. When the receiver is in the process of acquiring enough satellite
signals for navigation, the receiver uses satellite orbital data (collected continuously from
the satellites) and last known position to find the satellites that should be in view.
ACQUIRING is indicated as the solution until a sufficient number of satellites have been
acquired for computing a solution.
When the receiver is in the process of acquiring a 3D navigational GPS solution, 3D NAV
is indicated as the solution until the 3D differential fix has finished acquisition. SBAS
(Satellite-Based Augmentation System) indicates INACTIVE. When acquisition is com-
plete, the solution status indicates 3D DIFF NAV and SBAS indicates ACTIVE.
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