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it can use the GPS for navigation.
MODES OF OPERATION:
The GNSSU operational modes are as follows:
· SelfTest
Mode − The GNSSU is in the selftest
mode for approximately 5 seconds. When the
selftest
mode is complete, the GNSSU enters the initialization mode.
· Initialization Mode − The GNSSU automatically enters the initialization mode to initialize its
hardware. When the hardware is initialized, the GNSSU enters the acquisition mode.
· Acquisition Mode − The GNSSU enters the acquisition mode to acquire satellites (minimum 4),
or from other modes (NAV or Aided), when it does not have sufficient satellite and/or aiding
data to remain in either the NAV or the Aided mode. From the acquisition mode, the GNSSU
enters the NAV mode.
· Navigation (NAV) Mode − The GNSSU enters the NAV mode when it has computed a
navigation solution that provides position, velocity, and time measurements. The GNSSU
sends GPS position data to the FMS. From the NAV mode the GNSSU enters the acquisition
mode or aided mode.
· Aided Mode − The GNSSU enters the aided mode when there is insufficient satellite and/or
altitude information, but externalaided
data (inertial velocities from the FMS) is available to
continue to update the NAV filter. While in this mode, the GNSSU provides valid time outputs.
From this mode, the GNSSU enters the NAV or acquisition mode.
· Altitude Aiding Mode − The GNSSU enters the altitude aiding mode if satellite measurements
(less than 4) are not sufficient to maintain integrity or remain in the NAV mode. This mode uses
altitude data from the ADC to aid the navigation solution and integrity monitoring during
extended periods of insufficient satellite coverage and geometry. When the calibrated pressure
altitude deviation estimate is out of limits, it reverts to the aided mode. From this mode, the
GNSSU enters the NAV or aided modes.
· Fault Mode − The GNSSU enters the fault mode when any faults in the GNSSU is detected.
This mode supersedes all other modes. Any faults will be reported on the FMS CDU. The FMS
MSG indicator MSG will illuminate and GPS 1 (2) FAILED message will appear in the FMS
scratchpad.
GPS 1 FAILED
The control stations that continuously track and monitor the satellites, are located in Ascension
Island, Diego Garcia, Hawaii, Kawajalein Island and Colorado Springs. GPS has an accuracy of 100
meters in 95% of the position fixes.
NAVIGATION
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
17−10−79
MODES OF OPERATION: (CONT'D)
GPS Access
To access the GPS on the FMS CDU, proceed as follows:
GF1710_176
NAV INDEX 1/2
FPL LIST FPL SEL
WPT LIST DATA BASE
DEPARTURE ARRIVAL
POS SENSORS TUNE
NAV INDEX 1/2
FPL LIST FPL SEL
WPT LIST DATA BASE
DEPARTURE ARRIVAL
POS SENSORS TUNE
POS SENSORS 1/2
FMS POS UPDATE
IRS 1 STATUS
IRS 2 STATUS
VOR / DME POSIT INIT
N33 ° 26 . 6 W112 ° 12 . 1
N33 ° 26 . 6 W112 ° 12 . 1
N33 ° 26 . 6 W112 ° 12 . 1
POS SENSORS 1/2
FMS POS UPDATE
IRS 1 STATUS
IRS 2 STATUS
VOR / DME POSIT INIT
N33 ° 26 . 6 W112 ° 12 . 1
N33 ° 26 . 6 W112 ° 12 . 1
N33 ° 26 . 6 W112 ° 12 . 1
POS SENSORS 2/2
FMS POS UPDATE
GPS STATUS
VOR / DME POSIT INIT
N33 ° 26 . 6 W112 ° 12 . 1
N34 ° 02 . 6 W112 ° 02 . 3
GPS Status
GPS STATUS 1/2 displays the following information:
· GPS position
· Groundspeed
· Altitude
· Miles from FMS position
NAVIGATION
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
17−10−80
MODES OF OPERATION: (CONT'D)
GPS Status (Cont’d)
To view the GPS STATUS 1/2 on the FMS CDU, proceed as follows:
GF1710_177
1 Press STATUS key.
POS SENSORS 2/2
FMS POS UPDATE
GPS STATUS
VOR / DME POSIT INIT
N33 ° 26 . 6 W112 ° 12 . 1
N34 ° 02 . 6 W112 ° 02 . 3
GPS 1 STATUS 1/2
GPS POSITION
GRD SPD = 310 GPS ALT
MILES FR FMS POS
POS SENSORS PRED RAIM
N34 ° 02 . 6 W112 ° 02 . 3
N302 KT E68 KT 14999
NO . 1 W 4 . 4 TOTAL 4 . 4
GPS STATUS 2/2 displays the following information:
· Receiver Autonomous Integrity Monitor (RAIM).
· Figure of Merit (FOM).
· Horizontal Dilution of Precision (HDOP).
· Vertical Dilution of Precision (VDOP).
· Time (UTC) and Date.
　
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