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庞巴迪环球5000公务机机组操作手册 Bombardier Global-导航(29)

时间:2011-11-11 09:40来源:蓝天飞行翻译 作者:公务机
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Initialization Mode . The GNSSU automatically enters the initialization mode to initialize its hardware. When the hardware is initialized, the GNSSU enters the acquisition mode.

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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.

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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.

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Aided Mode . The GNSSU enters the aided mode when there is insufficient satellite and/or altitude information, but external-aided 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.

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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.

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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

will illuminate and GPS 1 (2) FAILED message will appear in the FMS scratchpad.

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.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual  Volume 2

NAVIGATION
 
MODES OF OPERATION: (CONT'D)
GPS Access
To access the GPS on the FMS CDU, proceed as follows:

GPS Status
GPS STATUS 1/2 displays the following information:
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GPS position

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Groundspeed

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Altitude

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Miles from FMS position


Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
MODES OF OPERATION: (CONT'D)
GPS Status (Cont’d)
To view the GPS STATUS 1/2 on the FMS CDU, proceed as follows: Press STATUS key.


GPS STATUS 2/2 displays the following information:
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Receiver Autonomous Integrity Monitor (RAIM).


 
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