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The GPS has a receiver autonomous integrity monitor (RAIM)
function. The RAIM monitors the status of the satellites that the
GPS uses for calculations. The output of the RAIM function is an
estimate of the GPS position error. The autonomous integrity
monitor value goes to the FMC. The FMC uses the autonomous
integrity monitor to determine if it can use GPS data for
navigation.
Values Calculated by the GPS
These are some of the values that the GPS calculates:
* Latitude
* Longitude
* Altitude
* Universal time (coordinated) (UTC)
* Date
* North/south velocity
* East/west velocity
* Vertical velocity
* Track angle
* Autonomous integrity limit
* Satellite position
* GPS status.
GPS - THEORY OF OPERATION - 3
EFFECTIVITY
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GPS - THEORY OF OPERATION - 3
GPS - THEORY OF OPERATION - 3
EFFECTIVITY
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Power
The power supply makes various dc voltages from the 115v ac
input to the multi-mode receiver (MMR).
Satellite Signal Processing
The GPS antenna first amplifies the satellite signals and then
sends them to the MMR. The low noise amplifier (LNA) in the
MMR receives and amplifies the satellite signals from the GPS
antenna. The receiver detects the satellite signal and sends it to
an analog to digital converter (A/D). The A/D sends the digitized
signal to the microprocessor. The microprocessor calculates
the airplane position and other GPS data. The GPS data goes to
these units:
* Ground proximity warning computer (GPWC)
* Clocks
* Flight management computer (FMC 1).
The IRS master caution unit receives digital fault data from GPS
systems 1 and 2.
Inputs
The ADIRU sends inertial reference data on output bus 4 for
initialization. The MMR uses this data in the aided and altitude
aided modes.
The program pins tell position to the MMR. This is used for the
source destination identifier (SDI) code in ARINC 429 data.
GPS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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GPS - FUNCTIONAL DESCRIPTION
GPS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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One GPS Failure
If there is one GPS failure, there is no annunciation until you
push the system status annunciator panel assembly (recall).
When you push the annunciator panel, these annunciations
show:
* GPS light on the IRS mode select unit
* IRS light on the system status annunciator
* Left and right master caution lights.
When you release the annunciator panel assembly, all the
annunciations stay on until you reset by a push of either the left
or right master caution light (reset).
Two GPS Failures
If both GPS systems have a failure, these annunciations show:
* GPS light on the IRS mode select unit
* IRS light on the system status annunciator
* Left and right master caution lights.
When you push and release either the left or right master
caution light, the IRS light and master caution lights go out but
the GPS light stays on.
GPS - GPS FAULT MONITORING - FUNCTIONAL DESCRIPTION
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GPS - GPS FAULT MONITORING - FUNCTIONAL DESCRIPTION
GPS - GPS FAULT MONITORING - FUNCTIONAL DESCRIPTION
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General
GPS data shows on the control display unit (CDU). The position
pages show this data. These are the three position pages:
* Position initialization (1/3)
* Position reference (2/3)
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