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Views of the U.S. NAS and NAE on Agenda Items at the World Radiocommunication Conference 2015 (2013) / Chapter Skim
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3 Concluding Remarks
Pages 31-36

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From page 31...
... Strategies to minimize RFI for RAS and EESS include cooperative agreements, respecting primary and secondary spectrum allo 1  OTE: Portions of this text are adapted from National Research Council, Views of N the NAS and NAE on Agenda Items at Issue at the World Radiocommunication Conference 2012, The National Academies Press, Washington, D.C., 2013. 1National Research Council, Spectrum Management for Science in the 21st Century, The National Academies Press, Washington, D.C., 2010.
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From page 32...
... It is likely that spurious and out-of-band emissions will be an even greater problem in the future as the active services continue to proliferate and scientific advances drive radio astronomers to observe weaker and weaker sources. Recommendation ITU-R RA.769 discusses interference protection criteria for the RAS and defines threshold levels of
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From page 33...
... Radio spectroscopic observations require observations at frequencies determined by the physical and chemical properties of individual atoms and molecules. In particular, our knowledge of the chemical makeup of the universe comes through measurement of spectral lines arising from quantum mechanical transitions, so it is important to protect the frequencies characteristic of the most important atomic and molecular cosmic constituents.
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From page 34...
... Examples are parameters such as ocean temperature and salinity, needed to understand ocean circulation and the associated global distribution of heat. Passive remote sensing is also important for monitoring soil moisture, a parameter needed for monitoring and predicting agricultural productivity for food security; land use; for the assessment, adaptation and risk management of hydrological extremes such as drought and floods; for weather prediction (heat exchange with the atmosphere)
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From page 35...
... The high radiometric accuracy and sensitivity needed to accomplish the measurements of modern EESS systems results in commensurately high sensitivity to RFI that can cause errors in the retrieval of geophysical parameters. A description of the impact of such emissions on a specific EESS geophysical measurement is discussed in §2.2 of Spectrum Management for Science in the 21st Century.2 The maximum signal-power contamination that can exist without impacting the information contained in the EESS measurement has been derived by scientists for each of the EESS allocated bands and is documented in Recommendations RS.1029 and RS.2017.
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Key Terms

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  • remote locations
  • astronomy service
  • world radiocommunication
  • spectral lines

  • spectrum management
  • require observations
  • radiocommunication conference
  • radio frequency
  • passive remote

  • passive services
  • frequency interference
  • local shielding
  • agenda items
  • allocated specifically

  • broad bandwidths
  • distant sources
  • rfi mitigation
  • astronomy observations
  • radio emission

  • astronomy antenna
  • satellite remote
  • passive sensors
  • scientific advances
  • frequency bands

  • scientific return
  • major radio
  • drive radio
  • spectral bands
  • radio astronomers


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