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Title
Systems for data processing, anaylsis and representation

PERFORMANCE PREDICTION OF AVNIR BY A SIMULATOR
HAJIME KOSHIISHI
Remote Sensing Technology Center
7-15-17, Roppongi, Minatoku, Tokyo, Japan
MASAO NAKA
National Aerospace Laboratoly
YOSHIYUKI KAWATA
Kanazawa Technology Institute
YOSHITAKA IWATA
Fujitu F.I.P Co.Ltd
CC ISPRS Commission II, Working Group 2
.yse
[ues ; : ;
t à KEY WORDS: Imaging spectrometer, Pushbroom scan, Simulation, ADEOS, AVNIR
de
iute
des ABSTRACT
des
les. The AVNIR(Advanced Visible Near Infrared Radiometer) is one of core sensors of japanese
next earth observation satellite ADEOS. The AVNIR has linear array for each multi-
spectral band and panchromatic band, and uses the pushbroom scheme for scanning. The
pushbroom scan has a sampling process in cross track scan as the inherent property. In
along track scan, there is no such a inherent sampling process, but there will be a image
phy degradation by the satellite motion. In such a high resolution spectrometer, the atmospher
stam has significant effect on the spatial resolution. A digital simulator for performance
-ing analysis and design of imaging spectrometer was developed. The performances of AVNIR
Pert affected by such a sampling process, degradations by satellite motion and atmosphere were
les. studied by the simulator and the results are presented.
and
the
or 1. INTRODUCTION electron charge of each sensor element co-
rresponds to radiance is scanned electro-
Recent high resolution imaging spectrometer nically. Therefore, here is a sampling
, such as HRV of SPOT, OPS of JERS-1, and process inherently. Aliasing ploblem will
MESSR of M0S-1, has a linear array on the be in such a pushbroom scan system. For
focal plane for each spectral band, and reduction the aliasing, it is necessary to
uses pushbroom scheme in the cross track increase the number of sensor element and
scan. The linear array includes a lot of to cut the higher excessive frequency res-
sensor elements, for example, 6,000 ele- ponce.
ments for HRV and 4,000 elements for OPS. In the along track scan, there is no such a
The linear array is put on the focal plane alias problem, but the imaging data is de-
of optics in cross track direction, and the graded by the motion of platform.
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