Radar imaging and high-resolution array processing applied to a classical VHF-ST profiler

Details Radar imaging and high-resolution array processing applied to a classical VHF-ST profiler Radar imaging and high-resolution array processing applied to a classical VHF-ST profiler

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jastp..63..263h&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 63, Issue 2-3, p. 263-274.

Physics

9

Scientific paper

Among the spaced antenna methods used in the field of atmospheric studies, radar interferometry has been of great interest for many authors. A first approach is to use the phase information contained in the cross-spectra between antenna output signals and to retrieve direction of arrival (DOA) of discrete scatterers. The second one introduces a phase shift between the antenna signals in order to steer the main beam of the antenna towards a desired direction. This paper deals with the later technique and presents a variant of postset beam steering (PBS) which does not require a multi-receiver system. Indeed, the data samples are taken alternately on each antenna by means of high-commutation-rate switches inserted before a unique receiver. This low-cost technique is called ``sequential PBS'' (SPBS) and has been implemented on two classical VHF-ST radars. The present paper shows that high flexibility of SPBS in angular scanning allows to perform radar imaging. Despite a limited maximum range due to the antennas' scanning, the collected data give a view of the boundary layer and the lower troposphere over a wide horizontal extent, with characteristic horizontally stratified structures in the lower troposphere. These structures are also detected by application of high-resolution imaging processing such as Capon's beamforming or Multiple Signal Classification algorithm. The proposed method can be a simple way to enhance the versatility of classical DBS radars in order to extend them for multi-sensor applications and local meteorology.

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