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 Phân mạng HF Chương 3 © HUST 2012 Hệ thống Thông tin Hàng Không Teminologies 3 AM(R)S: Aeronautical Mobile (Route) Service AM(OR)S: Aeronautical Mobile (Off-Route) Service DSB-AM: Double Side Band - Amplitude Modulation WRC: World Radio Conference SARP: Standard And Recommended Practices Introduction 4 Introduction 5 Aviation Communication Services Airline Host System FAA/CAA Tower Systems ARINC Ground Network (AviNet ® ) ARINC Central Processing System (CPS) VHF Satcom HFDL ACARS/AOA ATN Air Traffic Service Provider Air/Ground Router GLOBALink SM by ARINC http://www.arinc.com/products/globalink/index.html GLOBALink/HF Flight Tracks (9/00) 6 GLOBALink/HF Flight Tracks (2003) 7 HF Range 8 GLOBALink/HFDL Global Coverage @2000 9 HF Ground Stations (12) Alaska Bolivia California + Guam (12/5) Hawaii Iceland Ireland New York New Zealand Russia South Africa Thailand Legend HFDL ground station Areas of Primary coverage Areas of Secondary coverage GLOBALink/HFDL Global Coverage @2001 10 Legend HF Ground Stations (14) Alaska + Bahrain Bolivia California + Canary Islands Guam Hawaii Iceland Ireland New York New Zealand Russia South Africa Thailand HFDL ground station Areas of Primary coverage Areas of Secondary coverage [...]...GLOBALink/HFDL Global Coverage @20 03 HFDL Ground Stations Alaska Bahrain Bolivia California Canary Islands Guam Hawaii Iceland Ireland New York New Zealand Russia South Africa Thailand Legend HFDL ground station Areas of Primary coverage Areas of Secondary coverage 11 ARINC GLOBALink World Wide VHF Coverage 12 GLOBALink/HFDL Global Coverage 13 High Frequency Data Link: HFDL  High Frequency Data Link, or HFDL,... When passing traffic, dedicated TDM time slots are used This prevents two aircraft transmitting at the same time causing data collisions 32 A simple SSB transmitter/receiver 33 HF radio equipment Aircraft HF radio specifications HF radio control unit HF antenna location 34 Trường Đại học Bách Khoa Hà Nội Hanoi University of Science and Technology ... typical daytime frequency for aircraft communication might be 8 MHz whilst this might be as low as 3 MHz during the night 21 HF Propagation HF bands are allocated to the aeronautical service 22 HF Propagation  Each HGS operates on 2 -3 channels and is equipped with a family of HF frequencies ranging from 2 -30 MHz  Adaptive Frequency Management techniques are employed to obtain weekly Active Frequency... and AD hex in the case of the fourth message)  Each aircraft also transmits its current location data (longitude and latitude) 31 HF data link  The system used for HFDL data exchange is specified in ARINC 635  Each Ground Station transmits a frame called a ‘squitter’ every 32 seconds  The squitter frame informs aircraft of the system status, provides a timing reference and provides protocol control... communication system  The HFDL system is a segment of the Aircraft Communications Addressing and Reporting System (ACARS) used to exchange Airline Operational Control (AOC) and Air Traffic Control (ATS) messagesbetween aircraft end systems and corresponding ground-based stations  GLOBALink /HF provides HF- based, air-to-ground digital communications with aircraft using ARINC 635 protocol  The HFDL system uses... (ATC) 27 Selective calling (SELCAL) 28 HF data link Aircraft operational control at various ‘out-off-on-in’ (OOOI) stages 29 HF data link HFDL messages sent from the four aircraft shown to the Shannon HFDL ground station using the same communications channel 30 HF data link The radio path from one of the aircraft (LH8409) - Shannon HGS  Log-on requests and the maximum bit rate is specified in the... solar and geomagnetic observational data and HF propagation models  Each week, an updated AFT is uploaded to each HGS from the ARINC Operations Center (AOC) in Annapolis, Maryland, USA  The AFT instructs the ground station on which frequencies to operate over the course of each 24-hour period 23 HF Modulation: SSB modulation 24 KNOWLEDGE CHECK 1 Explain why HF radio is used on trans-oceanic routes 2... HF aircraft communications during the day and at night 1 State TWO advantages of using SSB modulation for aircraft HF communications 25 Selective calling (SELCAL) 26 Selective calling (SELCAL) SELCAL codes are uniquely allocated to particular aircraft by Air Traffic Control (ATC) 27 Selective calling (SELCAL) 28 HF data link Aircraft operational control at various ‘out-off-on-in’ (OOOI) stages 29 HF. .. HF- based, air-to-ground digital communications with aircraft using ARINC 635 protocol  The HFDL system uses the principles of geographic diversity and frequency diversity to optimize HF propagation 14 High Frequency Data Link: HFDL  HFDL is currently the only truly global aeronautical data link capability, and the only data link for flight routes over the North Pole  Inmarsat satellite SATCOM coverage becomes... Earth when the sun is active with 50 or more sunspots, During the night cosmic rays produce a residual amount of ionization as a result high-frequency (HF) radio waves aren't reflected by the D layer The D layer is mainly responsible for absorption of HF radio waves, particularly at 10 MHz and below, with progressively smaller absorption as the frequency gets higher The absorption is small at night and . University of Science and Technology Phân mạng HF Chương 3 © HUST 2012 Hệ thống Thông tin Hàng Không Teminologies 3 AM(R)S: Aeronautical Mobile (Route). http://www.arinc.com/products/globalink/index.html GLOBALink /HF Flight Tracks (9/00) 6 GLOBALink /HF Flight Tracks (20 03) 7 HF Range 8 GLOBALink/HFDL Global Coverage @2000 9 HF Ground Stations