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34 - NAVIGATION
34-36-00 MMR SYSTEM PRESENTATION
CONTENTS:
General
ILS Principle
GPS Principle
Components
ILS Indicating
GPS Indicating
Self Examination
TMUMMRA01 LEVEL 1
EFFECTIVITY 34-36-00 Page 1
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
EFFECTIVITY Page 159
ALL
MMR SYSTEM PRESENTATION
GENERAL
The Multi Mode Receiver (MMR) system is a Navigation
Sensor with 2 internal receivers.
MMR = ILS + GPS
ILS PRINCIPLE
The function of the Instrument Landing System (ILS)
is to provide the crew and airborne system users with
signals transmitted by a ground station.
A descent axis is determined by the intersection of a
Localizer beam (LOC) and a Glide Slope beam (G/S)
created by this ground station at known frequencies.
The ILS allows measurement and display of angular
deviations and receives the Morse audio signal which
identifies the ILS ground station.
ILS operational frequency range:
- LOC: between 108.1 and 111.95 MHz,
- G/S: between 329.15 and 335 MHz.
TMUMMRA01-T01 LEVEL 1
EFFECTIVITY 34-36-00 Page 2
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
EFFECTIVITY Page 160
ALL
MMR SYSTEM PRESENTATION - ILS PRINCIPLE
TMUMMRA01-P01 LEVEL 1
EFFECTIVITY 34-36-00 Page 3
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
EFFECTIVITY Page 161
ALL
MMR SYSTEM PRESENTATION
GPS PRINCIPLE
The NAVigation System Time And Ranging Global
Positioning System ( NAV.S.T.A.R. GPS ) is a worldwide
navigation radio aid which uses satellite signals to
provide accurate navigation information.
The architecture of the system is composed of 3 parts
called segments:
- Spatial Segment
- Control Segment
- User Segment
SPATIAL SEGMENT
The spatial segment is composed of a constellation of
24 satellites.
These satellites are arranged in six separate orbital
planes of four satellites each on a circular orbit and
have the following characteristics:
- 55° inclination to the Equator,
- an altitude of approx 20200 km with an orbital
period of 12 sideral hours.
These satellites give:
- the satellite position (Ephemeris of the
constellation),
- the constellation data (Almanach).
- the atmospheric corrections.
TMUMMRA01-T02 LEVEL 1
EFFECTIVITY 34-36-00 Page 4
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
EFFECTIVITY Page 162
ALL
MMR SYSTEM PRESENTATION - GPS PRINCIPLE - SPATIAL SEGMENT
TMUMMRA01-P02 LEVEL 1
EFFECTIVITY 34-36-00 Page 5
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
EFFECTIVITY Page 163
ALL
MMR SYSTEM PRESENTATION
GPS PRINCIPLE (Continued)
CONTROL SEGMENT
The control segment is composed of four monitor
stations and one master control station which track
the satellites, compute the ephemeris, clock
corrections and control the navigation parameters and
transmit them to the GPS users.
The four monitor stations are located at:
- KWAJALEIN
- HAWAII
- ASCENCION ISLAND
- DIEGO GARCIA
The master control station is located at:
- COLORADO SPRINGS.
TMUMMRA01-T03 LEVEL 1
EFFECTIVITY 34-36-00 Page 6
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
EFFECTIVITY Page 164
ALL
MMR SYSTEM PRESENTATION - GPS PRINCIPLE - CONTROL SEGMENT
TMUMMRA01-P03 LEVEL 1
EFFECTIVITY 34-36-00 Page 7
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
EFFECTIVITY Page 165
ALL
MMR SYSTEM PRESENTATION
GPS PRINCIPLE (Continued)
USER SEGMENT
The principle of GPS position computation is based on
the measurement of transmission time of the GPS signals
broadcast by at least 4 satellites.
This segment is constitued by the GPS receiver and
defined as follows:
- signal acquisition,
- distance calculation,
- navigation computation (Satellite choice,
positioning, propagation corrections),
- detection and isolation of failed satellites
(GPS PRIMARY).
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