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for example in the case of RVSM implementation. In this case
a modelling of the variation of atmospheric pressure with
altitude must be established
ADS-B provides barometic and geometric Altitude
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Thales ATM Do not reproduce without permission
3 - Conclusion
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Thales ATM Do not reproduce without permission
Airport Multilateration Summary
Strengths
High performance
For airports, it exceeds present
SMR performance
No additional aircraft equipage
required
Aircraft widely equipped with SSR
transponders
More and more aircraft are
equipped with Mode S
Transponders
Lifecycle cost lower than Radar
no rotating machinery,
essentially maintenance-free
Weaknesses
Performance affected by
ground effects (multipath,
shadowing, etc)
Change in installations and
procedures may be required
So transponder is not disabled
on the ground
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Thales ATM Do not reproduce without permission
Key Features
Automatic aircraft labelling/
Identification
Passive aircraft location
Growth potential to receive and
forward ADS-B reporting
Easily adaptable to airport layout
Integration into STREAMS (Thales
ATM’s SMGCS)
Co-operative Multilateration System
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Thales ATM Do not reproduce without permission
MAGS Target Location Methods
Passive multilateration
Using all Mode S downlink formats
received
Active multilateration
Includes a low power interrogator
(100 W) for less covered areas and
approach
Capable of growth towards reception
and processing of ADS-B / extended
squitter
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Thales ATM Do not reproduce without permission
MAGS Adaptability
Scaleable number of Ground Stations
Adjustable antenna coverage
Processing algorithms individually
adaptable for each airport area
Full local and remote control
Easy integration into STREAMS
Wide range of Commercial Off The Shelf
(COTS) network equipment
Industry standard interfaces and protocols
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Thales ATM Do not reproduce without permission
Coping with Multipath
Antenna patterns and special MAGS signal processing design allow
to reduce multipath influence
It is essential to optimise ground stations placement
A trade-off must be carried out between station geometry ,
multipath avoidance, and operational constraints
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Thales ATM Do not reproduce without permission
MAGS Technical Data
TOA resolution: 128 MHz (7 ns / 2.4 m)
Mean accuracy: < 7 m
Detection probability: >95%
>99% in restricted areas
(e.g. runways)
Mean update rate: 1/s
Localisation capacity: 300 plots/s max.
Interrogation capacity: 200/s
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Thales ATM Do not reproduce without permission
MAGS-GSR (outdoor Version)
Off-the-Shelf Cabinet
Heat Exchanger between Twin Walls
300 W Heater
To be mounted to a wall, to a mast or
standing on Ground (together with
plinth as shown)
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MAGS at Köln/Bonn Airport
• Focus on one area
(Apron, TWY A/B/E, RWY14L)
• Five Ground Stations
(1 GST 4 GSR)
• Uses all valid Mode S
downlink formats
• Raw data shown,
i.e. no tracking or filtering
• Remote control, diagnosis
and configuration
over ISDN/SNMP
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Thales ATM Do not reproduce without permission
ACRONYMS
ADS-B : Automatic Dependence
Surveillance Broadcast
COTS : Commercial Off The
Shelf
CS : Central Station
DPX : Duplexer
GSR : Receive only Ground
Station
GST : Transmit only Ground
Station
HDOP : Horizontal Dilution of
Precision
ISDN : Integrated Service Digital Network
MAGS : Mode S Airport Ground Sensor
NTA : Network Terminal Adapter
RWY : Runways
RXU : Receiver Unit
SNMP : Simple Network Management
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