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UNITED STATES DEPARTMENT OF TRANSPORTATION GLOBAL POSITIONING SYSTEM (GPS) ADJACENT BAND COMPATIBILITY ASSESSMENT
  • Published Date:
    2018-04-01
  • Language:
    English
Filetype[PDF-27.81 MB]


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UNITED STATES DEPARTMENT OF TRANSPORTATION GLOBAL POSITIONING SYSTEM (GPS) ADJACENT BAND COMPATIBILITY ASSESSMENT
Details:
  • Resource Type:
  • Geographical Coverage:
  • Edition:
    Final Report
  • Format:
  • Description:
    The goal of the U.S. Department of Transportation (DOT) Global Positioning System (GPS) Adjacent Band Compatibility Assessment is to evaluate the maximum transmitted power levels of adjacent band radiofrequency (RF) systems that can be tolerated by GPS and Global Navigation Satellite System (GNSS) receivers. The results of this effort advance the Department’s understanding of the extent to which such adjacent band transmitters impact GPS/GNSS devices used for transportation safety purposes, among numerous other civil applications. The assessment described in this report addresses transmitters in bands adjacent to the 1559-1610 MHz radionavigation satellite service (RNSS) band used for GPS Link 1 (L1) signals that are centered at 1575.42 MHz. The DOT GPS Adjacent Band Study is the product of an extensive process to gather stakeholder views and input. OST-R and FAA benefited significantly from feedback received via governmental and public outreach on equipment use cases, interaction scenarios, propagation models, and transmitter characteristics. Certified GPS avionics meet their performance requirements when operating within the RF interference (RFI) environment defined in appropriate FAA Technical Standard Orders (TSOs). For civil GPS/GNSS receivers other than certified avionics, receiver testing needed to be conducted to determine the Interference Tolerance Masks (ITMs) for various categories of receivers. ITM defines, for a particular receiver, the maximum received aggregate interference power that can be tolerated by the corresponding tested GPS/GNSS receiver. To accomplish this testing, OST-R sought to include a broad range of devices used in rail, aviation, motor vehicle, maritime, and space applications, among a number of other civil uses of GPS/GNSS including timing, surveying, precision agriculture, weather forecasting, earthquake monitoring, and emergency response. The GPS/GNSS receivers for this test effort were provided by U.S. Government and industry partners and represented the diverse nature of GPS/GNSS applications and services. The U.S. Department of Transportation would like to thank all of the Federal departments and agencies for their participation in this effort, including the National Telecommunications and Information Administration (NTIA) and Federal Communications Commission (FCC), as well the GPS/GNSS receiver manufacturers who participated in the testing, and all of the stakeholders who attended the public workshops and RTCA meetings and provided valuable feedback during this effort.

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