DocumentCode :
738452
Title :
Reduced Image Aliasing With Microwave Radiometers and Weather Radar Through Windowed Spatial Averaging
Author :
McLinden, Matthew L. ; Wollack, Edward J. ; Heymsfield, Gerald M. ; Li, Lihua
Volume :
53
Issue :
12
fYear :
2015
Firstpage :
6639
Lastpage :
6649
Abstract :
Microwave remote sensing instruments detect and image physical phenomena such as brightness temperature and volume reflectivity. The spatial resolution of these measurements is limited by the physical properties of the instrument such as the antenna size, the spatial scan pattern, and temporal sampling. Analysis shows that common sampling schemes undersample the spatial information present at the antenna. Here, we address methods to better capture the spatial information available by applying the Nyquist–Shannon sampling theory to the spatial averaging and sampling of remote sensing data. The use of overlapping windows for spatial averaging rather than treating pixels independently improves the image fidelity while maintaining the system sensitivity. Additionally, the sensitivity to spatially small targets can be maximized by matching the window shape to the antenna pattern. The spatial imaging of scanning radiometers, radars, and phased-array systems is addressed. These principles are demonstrated with the theory and data from the National Aeronautics and Space Administration Goddard Space Flight Center´s High-Altitude Imaging Wind and Rain Airborne Profiler (HIWRAP) radar.
Keywords :
Microwave radiometry; Radar antennas; Radar imaging; Radiometers; Meteorological radar; radar; radar imaging; radar remote sensing; radiometry; remote sensing;
fLanguage :
English
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
Publisher :
ieee
ISSN :
0196-2892
Type :
jour
DOI :
10.1109/TGRS.2015.2445100
Filename :
7159053
Link To Document :
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