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* Vertical velocity
* Horizontal dilution of precision (HDOP)
* Vertical dilution of precision (VDOP)
* Horizontal figure of merit (HFOM)
* Vertical figure of merit (VFOM)
* Date
* Time (UTC)
* Horizontal integrity limit (HIL)
* Sensor status.
Latitude and longitude (coarse and fine) information gives
airplane position for the TCF and terrain awareness functions.
Ground speed, true track, altitude, and vertical velocity are used
in the terrain awareness function.
Horizontal dilution of precision, vertical dilution of precision,
horizontal figure of merit and vertical figure of merit information
are used for airplane position accuracy calculations.
Date and time information is used in the fault monitor process,
which labels each fault with the date and time of occurrence.
The horizontal integrity limit is used to determine the current
integrity limit and GPS non-isolatable satellite failures.
Sensor status lets the GPWC monitor the status of the GPS
receiver.
IRS Master Caution Unit
The IRS master caution unit monitors data from the MMRs.
SDI Program Pins
Three program pins tell the MMR if it is number 1 or 2.
GPS - INTERFACES
EFFECTIVITY
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Purpose
The multi-mode receiver (MMR) contains the GPS receiver. The
GPS receiver receives navigation satellite signals to calculate
GPS data.
Physical Description
The MMR is a standard ARINC 600 3 MCU unit 3.6 inches wide,
7.9 inches high, and 14.6 inches long. It has passive cooling.
The MMR weighs 10 pounds and uses 115v ac, 400Hz power for
operation.
GPS - RECEIVER
EFFECTIVITY
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General
The GPS antennas receive L-band frequency signals (1575.42
MHz) and sends them to the multi mode receivers (MMR).
Each antenna contains an integrated preamplifier to increase
the signal level to the MMR. The antenna preamplifiers use 12v
dc which comes from the power supply in the MMR.
GPS - GPS ANTENNA
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GPS Segments
The GPS has these three segments:
* Satellite
* User
* Control.
Satellite Segment
The satellite segment is a group of satellites that orbit 10,900
nautical miles above the earth. Each satellite makes an orbit
once every 12 hours. There are 21 operational satellites and 3
spares.
The satellites continuously transmit radio signals with
navigation data, range code, and the exact time.
User Segment
The user segment is the GPS receiver unit on the airplane. It
receives the satellite signals. The GPS uses the satellite data to
calculate the airplane position.
Control Segment
The control segment has control and monitor stations on earth
that continuously monitor and track the satellites. The control
segment does these things:
* Monitor and correct satellite orbits and clocks
* Calculate and format a satellite navigation message. This
message has up-to-date descriptions of the satellites future
　
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