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Cover of 5.9GHz Satellite Interference Study - Field Study
5.9GHz Satellite Interference Study - Field Study
  • Publication no: AP-R430-13
  • ISBN: 978-1-921991-91-2
  • Published: 29 April 2013

This report discusses an investigation undertaken to determine the level of interfering signals from 5.9 GHz uplink transmissions of fixed satellite service (FSS) antennas in order to predict the potential level of impact of these transmissions on C-ITS devices and applications utilising the 5.9 GHz band (5.9 ITS).

In doing so the investigation proposes to determine if the Australian Communications and Media Authority (ACMA) proposed one kilometre interference contour as a basis for coordination where the elevation angle of an FSS is greater than 15° is sufficient for the proposed sharing of the 5.9 GHz band by FSS and 5.9 ITS.

The study does not investigate or measure the impact of FSS interference on operating 5.9 ITS equipment. Such a study may need to be undertaken at a later stage. This study is in addition to one previously commissioned by Austroads which was largely based on modelling the potential interference.

This investigation is based on field study measurements of the signal levels in the vicinity of six FSS sites operating in or near the 5.9 GHz band and located in Perth (four sites) and Sydney (two sites). The study investigated the impact of large FSS antennas (i.e. antennas with a diameter of more than 10 m) located at major telecommunication facilities and very small aperture terminal (VSAT) FSS antennas (i.e. antennas with a diameter of less than 3 m) located in urban areas.

The key finding of the study is that the 1 km contour proposed by ACMA for scenarios where the FSS elevation angle is more than 15° may be sufficient to enable co-existence of FSS and 5.9 ITS in the 5.9 GHz spectrum.

  • 1. Introduction
  • 2. Background
    • 2.1. Cooperative Intelligent Transport Systems
    • 2.2. Dedicated Short Range Communication (DSRC) Interoperability Study
      • 2.2.1. Key Conclusion from the Dedicated Short Range Communication (DSRC) Interoperability Study
    • 2.3. Australian Communications and Media Authority Proposed Sharing Conditions
    • 2.4. FSS Operating Environment
    • 2.5. Measuring the Potential Interference to 5.9 ITS as a Result of the Operation of FSS in the Same 5.9 GHz Band
  • 3. Field Surveys
    • 3.1. Extent of the Survey
      • 3.1.1. FSS Sites Included in the Survey
      • 3.1.2. Expected Road Illumination
    • 3.2. Method
      • 3.2.1. Survey Method
      • 3.2.2. Data Collection
      • 3.2.3. Data Presentation
    • 3.3. Results
      • 3.3.1. Perth Telstra Landsdale FSS
      • 3.3.2. Perth Stratos Landsdale FSS – High Power, Low Elevation Field Test
      • 3.3.3. Perth Optus Lockridge FSS
      • 3.3.4. Perth Optus Lockridge FSS – High Power, Low Elevation Field Test
      • 3.3.5. Sydney Optus Oxford Falls FSS
      • 3.3.6. Sydney Telstra Oxford Falls FSS
      • 3.3.7. West Perth Spidersat VSAT
      • 3.3.8. Summary of Findings
  • 4. Discussion
    • 4.1. Normal Telecommunications Operations
    • 4.2. High Power, Low Elevation Launch Support Operations
    • 4.3. VSATs in Urban Areas
  • 5. Conclusions
  • References
  • Appendix A FSS Licences with Potential to Impact on 5.9 ITS
  • Appendix B Fixed Satellite Service (FSS) Operations
  • B.1 Side Lobe Performance
  • B.2 Uplink Power
  • B.3 Launch Support
  • Appendix C Interference Model Used in the Study
  • C.1 Minimum Received Signal Power
  • C.2 Minimum Carrier to Interference Ratio
  • C.3 Transmission Inhibiting of 5.9 ITS by Fixed Satellite Service
  • C.4 Summary of Interference Model
  • Appendix D Perth Field Surveys
  • D.1 Telstra Landsdale (Telecommunication Uplinks)
  • D.1.1 Transmission Details
  • D.1.2 Field Survey Findings
  • D.2 Stratos Landsdale (High Power, Low Elevation Tracking, Telemetry, Command and Monitoring Facility)
  • D.2.1 Transmission Details
  • D.2.2 Field Survey Findings
  • D.3 Optus Lockridge (Telecommunication Uplinks)
  • D.3.1 Transmission Details
  • D.3.2 Field Survey Findings
  • D.4 Optus Lockridge (High Power, Low Elevation Tracking, Telemetry, Command and Monitoring Facility)
  • D.4.1 Transmission Details
  • D.4.2 Field Survey Findings
  • D.5 Spidersat West Perth (VSAT)
  • D.5.1 Transmission Details
  • D.5.2 Field Survey Findings
  • D.6 First Quantum Minerals West Perth (VSAT)
  • D.6.1 Transmission Details
  • D.6.2 Field Survey Findings
  • Appendix E Sydney Field Surveys
  • E.1 Optus Oxford Falls
  • E.1.1 Transmission Details
  • E.1.2 Field Survey Findings
  • E.2 Telstra Oxford Falls
  • E.2.1 Transmission Details
  • E.2.2 Field Survey Findings
  • E.3 Oxford Falls Observations of the Effect of Antenna Height on Received FSS Signal
  • Appendix F Equipment used in the Study
  • F.1 Spectrum Analyser
  • F.2 Test Antennas and Cables
  • Glossary