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LMM for the Kodiak 100
Page 4-55
190-02102-00 Rev.4
4.7.3.7.5 GPS Satellite Signal Strengths
The GPS1 and GPS2 Status Panes can be helpful in troubleshooting weak (or missing)
signal levels due to poor satellite coverage or installation problems. As the GPS receiver
locks onto satellites, a signal strength bar is displayed for each satellite in view, with the
appropriate satellite PRN number (01-32 or 120-138 for WAAS) below each bar. The
progress of satellite acquisition is shown in three stages, as indicated by signal bar
appearance:
• No Bar - The receiver is looking for the indicated satellite.
• Hollow Bar - The receiver has found the satellite and is collecting data.
• Cyan Bar - The receiver has collected the necessary data and the satellite signal
can be used.
• Green Bar - The Satellite is being used for the GPS solution.
• Checkered Bar - The receiver has excluded the satellite (Fault Detection and
Exclusion)
• ‘D’ Indication - Denotes the satellite is being used as part of the differential
computations.
Each satellite has a 30-second data transmission that must be collected (signal strength
bar is hollow) before the satellite can be used for navigation (signal strength bar
becomes solid).
4.7.3.7.6 Poor Satellite Signal Strength
Possible Solutions:
1. Make sure that no cell phone or device using cell phone technology is turned on
in the cable, even in a monitoring state.
2. Check for possible external interference to the GPS receivers by selecting the
GPS status page on the Touchscreen Controller and check the GPS strength
bars on both GPS receivers. If the signal strength level is erratic, or if they
disappear and reappear rapidly, or if they switch between a solid and hollow bar
frequently, there is possibly an external device interfering with the GPS receivers.
Turn off any devices that radiate a signal in the local area or move the aircraft to
another location to see if the interference is removed.
3. Check the date and time shown on the Date/Time Setup page and enter the
correct values, if necessary (see
).
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