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Special relativity corrections for space-based lidars.

V S Gudimetla1, M J Kavaya

  • 1Department of Electrical and Computer Engineering, Oregon Graduate Institute, PO Box 91000, Portland, Oregon 97291-1000, USA. gudimetla@comsoft.com

Applied Optics
|March 8, 2008
PubMed
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Special relativity effects on space-based Doppler lidar were analyzed. For NASA

Area of Science:

  • Physics
  • Earth Science
  • Optical Engineering

Background:

  • Space-based coherent Doppler lidars are crucial for Earth and atmospheric observation.
  • Understanding relativistic effects is important for accurate measurements from moving platforms.

Purpose of the Study:

  • To analyze physical phenomena in space-based coherent Doppler lidars using special relativity.
  • To evaluate the impact of relativistic effects on wind speed measurements.

Main Methods:

  • Applied special relativity to analyze diffuse scattering and retroreflection lidar target interactions.
  • Calculated Doppler shift, frequency shifts, and receiver aperture tip.
  • Examined errors in wind estimation due to relativistic Doppler shifts.

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Main Results:

  • For diffuse scattering, coaligned transmitter/receiver on a satellite show no angular separation.
  • Retroreflection results in misalignment between transmitted and received rays.
  • Special relativity effects were found to be small for the proposed NASA lidar system.

Conclusions:

  • Special relativity introduces specific phenomena in space-based Doppler lidar operations.
  • The analyzed relativistic effects have minimal impact on proposed NASA wind and aerosol measurement systems.