19-10-2010, 05:07 PM
Stereoscopic Passive Millimeter-Wave Imaging and Ranging
Thomas Lüthi and Christian Mätzler, Senior Member, IEEE
Abstract—
This paper presents the first stereoscopic range measurements
at a wavelength of 3.3 mmand discusses the accuracy of
this new method. The synthesis of passive millimeter-wave imaging
and stereoscopy combines the advantages of both principles, naturally
looking high-contrast images and superior poor-weather performance
(compared to visible and infrared wavelengths), as well
as the passive ranging capability. Our setup using two antennas
with a half-power beamwidth (HPBW) of 0.9 and a stereoscopic
baseline of 1.15mallows ranging with an accuracy of 10% up to a
distance of 300 m. The range resolution improves with increasing
stereoscopic baseline, lower radiometer noise, narrower antenna
beams, and higher scene contrast. For scenes with sufficient contrast,
the directional resolution is considerably better than the antenna
HPBW. Thus, massive oversampling of the scene in the plane
of the stereoscopic baseline is required. For our setup, an oversampling
factor of 36 is optimal. Since additional ranging errors result
from nonstationary scenes, fast scanning imagers should be
applied
for more :->
http://117.55.241.6/library/ieee/2005/mi...anging.pdf