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Title: High resolution refractivity measurement and its influence on radar clutter extent
Authors: Sarkar, S K
Pasricha, P K
Ghosh, A B
Dutta, H N
Prasad, M V S N
Reddy, B M
Issue Date: Feb-1992
Publisher: NISCAIR-CSIR, India
Abstract: The tropospheric medium, especially the lowest part of it, is subjected to a continuous variation in its three-dimensional refractive index. In radar operation, particularly at very low elevation angles, the apparent range and elevation angles obtained can be considerably at variance, with actual values. The suitability of a site for locating a high power radar is to be explored by obtaining high resolution meteorological data. The results on radio refractivity collected with high height resolution of 20 m are presented. The refractivity gradients are estimated across shallower levels. The ducts and layers are found to occur quite frequently during nighttime. The occurrence of layers is also significant even during early morning hours. The refractivity gradients across surface to 100 m are more intense as compared to gradients across surface to 200 m and surface to 300 m. The ground clutter extents are found to be associated with refractivity gradients across surface to 300 m while practically no correlation exits across surface to 100 m refractivity gradient values. The correlation coefficient of clutter extent with surface to 100m gradient is poor because of the wide beam widths of the operating radar.
Page(s): 5-9
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.21(1) [February 1992]

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