Fig.7 shows the degradation of spatial re- graded by this motion. The amount of the 
solution by atmosphere. (a) is a black and degradation depends on start point of the 
white sine input scene. (b) is the output integration. Fig.8 shows the motion degra- 
for 50m black and white input and (c) is dation. (a) is the white and black input 
the output for 16m black and white input scene. (b) is the best case and (c) is the 
scene. The atmosphere has serious effect worst case. The difference of best and 
on high resolution imaging. Worst is determined by the start point of 
integration. AVNIR can change the integra- 
5.4 Motion degradation in along track tion time. Resolution in along track be 
able to improve by this change of integra- 
i tion time. 
RA a 
Some performance predictions of AVNIR based 
on simulation studies using a digital simu- 
: 0 380 
latior are given. Followings are concluded. 
METER 1140 1520 (1) AVNIR will have some aliasing effect by 
the inherent sampling process as like 
(a) White and black input pattern as a usual pushbroom IS. 
(2) Resolution degradation by cross talk 
will be negligible because of its spec- 
tral sensitibity and stagger arrange- 
ment of sensor elements 
(3) Atmosphere will have considerable 
effect on spatial resolution 
(4) Spatial resolution in along track will 
LEVEL 
0.571429 
LEVEL 
8.57143 
  
orm 
Q0 380 760 1140 1520 be affected by the platform motion. It 
HETER depends on the start point of the in- 
tegration. Capability of integration 
(b) Output of best case time is usefull for improvement of the 
resolution in along track. 
More detailed simulation using the real 
characteristics of AVNIR is now in the 
planning stage. 
LEVEL 
  
REFERENCES 
0 380 760 1140 1520 H.Koshiishi,et al.: Simulator of pushbroom 
METER scan spectrometer, Proceedings of IGARS 
S'93, Aug.18-21, 1993, Tokyo, Japan, pp 
(c) Output of worst case 882-884 
H.Koshiishi : Why the pushbroom scan, and 
what the limitation ?, Proceedings of 
18th ISTS, 1992, Kagoshima, Japan. pP 
Fig.8 Motion degradation in along track 1925-1930 
In along track imaging, the signal from 
the ground is integrated during flight. 
Therefore, spatial resolution will be de- 
112