Author : Inchan Paek
Affiliation : PGM Image Sensor Centre, Hanwha Thales,
Kyunggi-do
Country :
Korea
Category : Computer Science & Information Technology
Volume, Issue,
Month, Year
: 6, 1, November, 2016
ABSTRACT
Conventional
terrain-aided navigation (TAN) technique uses an altimeter to locate the
position of an aerial vehicle. However, a major problem with a radar altimeter
is that its beam (or pulse) footprint on the ground could be large, and
therefore the nadir altitude cannot be estimated accurately. To overcome this
difficulty, one may use the nadir-looking synthetic aperture radar (SAR)
technique to reduce the along-track beam width, while the cross-track ambiguity
is resolved with the interferometry technique. However, the cross-track
resolution is still far from satisfactory, because of the limited aperture size
of antennas. Therefore, the usual three-antenna array cannot resolve multiple
terrain points in a same range bin, effectively. In this paper, we propose a
technique that can increase the cross-track resolution using a large number of
antennas, but in a switched fashion, not raising hardware cost.
Keyword :
TAN, SAR, Altimeter, Switched Array
For More Details : https://airccj.org/CSCP/vol6/csit64814.pdf
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