Radar measurements of aspect sensitivity of atmospheric scatterers using spaced-antenna correlation techniques

Details Radar measurements of aspect sensitivity of atmospheric scatterers using spaced-antenna correlation techniques Radar measurements of aspect sensitivity of atmospheric scatterers using spaced-antenna correlation techniques

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54..153b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, Feb. 1992, p. 153-165. Research supported by Australia

Physics

8

Atmospheric Scattering, Look Angles (Electronics), Radar Antennas, Radar Measurement, Radar Scattering, Angular Resolution, Backscattering, Correlation, Radar Echoes, Scattering Cross Sections, Synthetic Aperture Radar

Scientific paper

The theory of spaced-antenna techniques for the measurement of aspect sensitivity of radar backscatter from the atmosphere is considered. Correlation measurements made on the wave field can be used to determine the angular power spectrum of the returned energy in much the same way that aperture-synthesis techniques are used in radio astronomy. After correction for the antenna polar diagrams, this yields the aspect-sensitivity function for the refractive-index fluctuations which are responsible for the scatter. Allowance is made for the possibility that the backscattered power may vary with azimuth angle as well as zenith angle. It is shown that commonly available data from three spaced antennae can give useful information about aspect sensitivity, and can also be used to estimate the effective pointing angle of an off-vertical beam. A method is suggested which may provide increased angular resolution, based on the fact that a single antenna can observe a very long cross-section through a moving ground pattern. The method would be analogous to a synthetic-aperture radar.

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