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from the monitor stations to estimate satellite orbit and clock data. This information is
transmitted to the satellites and down to the users as a navigation message.
User Segment
The FMS uses the signal from the GPS satellites as a navigation sensor to upgrade its own
position. A minimum of three satellites is required for two-dimensional calculations, and four
satellites are required for three-dimensional calculations.
Components and Operation
GPS Receivers
Dual GPS receivers are installed in the Challenger 605 (GPS 1 and GPS 2). The GPS receivers
process signals from the orbiting constellation of GPS satellites to determine geographic
position. Each of the GPS receivers is capable of receiving up to 12 satellites. Tuning is fully
automatic, and does not require any pilot input/action.
GPS 1 is powered by the battery bus, and GPS 2 is powered by DC bus 2.
GPS Sensors and Navigation
The flight management system (FMS) is the interface between the GPS receivers and the
aircraft navigation systems. GPS position information is supplied to each FMS by the on-side
GPS receiver (GPS 1 supplies FMS 1, and GPS 2 supplies FMS 2). The FMS then calculates
the integrated navigation solution (FMS position) using a combination of GPS, DME/DME,
VOR/DME, and IRS sensor information.
In the event that on-side GPS information is not available, the FMS will automatically use
cross-side information, and display the GPS REVERTED message on the FMS CDU.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−73
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
GLOBAL POSITIONING SYSTEM (GPS) (CONT'D)
GPS RAIM
GPS Receiver Autonomous Integrity Monitoring (RAIM) is used to assure that the GPS position
information meet the required accuracy:
• 4 NM oceanic/remote;
• 2 NM en route;
• 1 NM terminal; and
• 0.3 NM final approach.
The current RAIM accuracy limit and measured accuracy limit are displayed on the MFD LRN
STATUS page 2/2. The measured accuracy limit indicates the maximum estimated error based
on measurement inconsistency. Unless an error is detected by RAIM, this value is always less
than the RAIM accuracy limit.
When an error is detected, it is annunciated on the MFD LRN STATUS page 2/2. If the detected
error cannot be predicted to be less than the required integrity threshold, GPS is removed from
the navigation solution.
If no error is detected by RAIM, the probable GPS error is shown. This is a statistical number
based on normal satellite error characteristics.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−74
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
GLOBAL POSITIONING SYSTEM (GPS) (CONT'D)
MFD LRN STATUS
Figure 17−10−70
In the terminal environment (30NM from airport reference point), RAIM accuracy is indicated by
the white TERM message above the NAV SOURCE display of the PFD.
On final approach, RAIM accuracy is indicated by the white GPS APPR message above the
NAV SOURCE display of the PFD.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−75
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
GLOBAL POSITIONING SYSTEM (GPS) (CONT'D)
If RAIM accuracy does not reach final approach tolerances, the yellow NO APPR message is
displayed above the NAV SOURCE display of the PFD.
PFD RAIM Indications
Figure 17−10−71
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−76
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
GLOBAL POSITIONING SYSTEM (GPS) (CONT'D)
For a complete listing of GPS and RAIM messages, see the “Collins FMS-6000 for the
Challenger 605” Pilot’s Guide.
FMS CDU RAIM Message
Figure 17−10−72
Controls and Indicators
FMS-GPS Control Page
The GPS control page allows the pilot to monitor the FMS aircraft position in relation to the
GPS. The position differential (POS DIFF) is shown in direction and magnitude from the FMS
position.
To alternately enable or disable use of a specific GPS sensor, push the left side line-select key
of that sensor. Enabled sensors show in large green font, and disabled sensors show in small
white font.
The DEST and ETA entries are those of the active flight plan. The flight crew can manually enter
changes to see if RAIM is available for other destinations and/or arrival times.
Satellite Deselect
Individual satellites can be deselected from use by entering the identifier for the satellite in the
FMS. This function would be used if the satellite is NOTAMed under test. When deselected, the
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