A study on aspect sensitivity of clear-air turbulence using coherent radar imaging of VHF atmospheric radar

J. -S. Chen; J. Furumoto

doi:10.1117/12.974988

8 November 2012 A study on aspect sensitivity of clear-air turbulence using coherent radar imaging of VHF atmospheric radar

J. -S. Chen, J. Furumoto

Author Affiliations +

Proceedings Volume 8523, Remote Sensing of the Atmosphere, Clouds, and Precipitation IV; 85231T (2012) https://doi.org/10.1117/12.974988
Event: SPIE Asia-Pacific Remote Sensing, 2012, Kyoto, Japan

Abstract

Aspect sensitivity of clear-air turbulence was examined with multiple-receiver coherent radar imaging (CRI) of VHF atmospheric radar. The study was carried out by means of aspect angle, estimated from two CRI parameters: direction of arrival of echo center from oblique radar beam and brightness distribution width from vertical radar beam. The brightness distribution was retrieved by the Capon method. Modification of brightness value has been made with a suitable radar beam-weighting function before estimating the two CRI parameters. The radar beam-weighting function used for correction is a Gaussian form, and its standard deviation (beam width) varies with off-beam direction angle and is also adaptive to signal-to-noise ratio of echoes. The use of adaptable beam width can avoid over-modifying the brightness values at the edges of the imaged map, yielding a more reliable estimate of aspect angle. The CRI-estimated aspect angle was compared with that obtained from comparison of echo powers of different oblique radar beams. The statistical features of aspect angles obtained from the two approaches are consistent.

Citation Download Citation

J. -S. Chen and J. Furumoto "A study on aspect sensitivity of clear-air turbulence using coherent radar imaging of VHF atmospheric radar", Proc. SPIE 8523, Remote Sensing of the Atmosphere, Clouds, and Precipitation IV, 85231T (8 November 2012); https://doi.org/10.1117/12.974988

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KEYWORDS

Radar

Signal to noise ratio

Atmospheric sensing

Radar imaging

Turbulence

Antennas

Beam analyzers

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