THÔNG TIN TÀI LIỆU
Trường Đại học Bách Khoa Hà Nội
Hanoi University of Science and Technology
© HUST 2012
Hệ thông Thông tin Hàng Không
TS. Đỗ Trọng Tuấn
Bộ môn Kỹ thuật thông tin
Trường Đại học Bách Khoa Hà Nội
Hanoi University of Science and Technology
Radar Mode-S
Chương 3
© HUST 2012
Hệ thống Thông tin Hàng Không
Teminologies
3
Radar: Radio Detection and Ranging
SSR: Secondary Surveillance Radar
Aeronautical Telecommunication (ATN)
Network Environment
ATN ROUTER
ATN ROUTER ATN ROUTER
Avionics Subnetwork
Mode S Subnetwork HF Subnetwork Satellite Subnetwork VHF Subnetwork
CAA Ground
Subnetwork
Management
Processor
ATN End System
Aeronautical
Operations
Data Base
ATN End System
Data Display
Processor
ATN End System
Data Entry
Processor
ATN End System
Management
Processor
ATN End System
Aeronautical
Operations
Control
ATN End System
Weather
Data Base
ATN End System
ATC
ATN End System
FIS
Data Base
ATN End System
Weather
Data Base
ATN End System
Service Provider
Ground Subnetwork
Airline Ground
Subnetwork
Primary Radar
Secondary Surveillance Radar
Primary radar relies on passive reflection
Secondary radar co-located with primary
SSR beam interrogates transponders
Transponder reply depends on its mode
ATC computers use SSR to tag primary echoes
with identifier and height
Secondary Surveillance Radar
interrogation
reply
Secondary Surveillance Radar
Transponders
A transponder is a receiver / transmitter device designed to
transmit a response signal when legitimately interrogated.
[NATO definition]
An automatic device that transmits a predetermined
message in response to a predefined received signal.
[Wikipedia]
SSR Principle
P1 P2
P1-P3 spacing
P3
Amplitude
(Interrogation message)
F1
Reponse mesasge
Amplitude
F2
t
P1-P3 spacing Request Modes
8 μs
21 μs
Identify 3/A
Height ?
C
0-2047
4096 codes
Step=
100 feet
Source: understanding radar systems
[...]... suppression 9 dB Radar mode S P1-P3 spacing Request Modes 8 μs Identify 21 μs Height ? 3/A C Amplitude Mode S (Source: http://web.mit.edu/6.933/www/Fall2000 /mode-s/ signal.html) Mode S Secondary Radar Secondary Radar Primary Radar Primary Radar Airport Surveillance Radar (ASR) Air Route Surveillance Radar (ARSR) Identification Friend or Foe (IFF) AWACS: Airborne Early Warning and Control System Radar mode...Secondary Surveillance Radar Mode A (simple system): Aircraft identification (Call-sign) Mode C (more advanced): Mode A + altitude Mode S (more recently): Mode C + 24 bit address identifier (unambiguous) Provides . http://web.mit.edu/6.933/www/Fall2000 /mode-s/ signal.html)
Radar mode S
Mode S
Secondary Radar
Primary Radar
Secondary Radar
Primary Radar
Airport Surveillance Radar (ASR).
Airline Ground
Subnetwork
Primary Radar
Secondary Surveillance Radar
Primary radar relies on passive reflection
Secondary radar co-located with primary
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