Also SWIR radiometer will have a - Stereo matching error:S = 0.5 pixel 
calibration capability. These VNIR and 7 Timing error:T:s 0.1 ms x 7.51 km/s = 
SWIR radiometers are array sensors, 0.751 m 
push-broom type of sensors. 
Meanwhile . TIR radiometer is a (2)Error analysis 
mechanical scanning type of a whisk- — The errors of concern are in the X- 
broom sensor. Major characteristics of direction, which is represented by the 
TIR radiometer is shown in Table 3. base. 
TIR radiometer will have an active B= 0.6H (1) 
cooling subsystem to realize a dH = dB/0. 6 (2) 
reasonable noise equivalent temperature dB = SQRT(SS + TT + PP) (3) 
and will also have a calibration 
capability with an internal blackbody of where P is error cased by attitude 
which the temperature will be changed change in pitch angle. 
from 270 — 340 K. 
P = H*d(a)/cos(a)cos (a) 
705+d (a) /0. 72544 (a=831. 6deg. ) (4) 
15m for 4.4 arcsec/9sec 
3. Parameters related to DEM generation 
Il 
  
  
  
  
  
  
  
the Major parameters regarding with (travel time/scene) 
then stereoscopic view is shown in Table 4. = 7.5m for 2:2-atcsec/9set 
STER dH = 27.98 m for 4.4 arcsec/9sec (5) 
pect 4. Theoretical error analysis . with 9:17. 72 m for 2:7 arcsec/9sec 
ters orientation to a reference datum 
able 5. Effect of attitude jitter in DEM 
or a (1) Assumpt ions estimation 
- Stereo model is assumed to have proper Comparativel i 
T ; x y high 
52. orientation with all Y-parallax removed component of attitud is Wel ius 
racy with appropriate GCP i ii ® thangs is referred 
of pprop S. to attitude jitter. If we assume the 
tude : 
tude Table 2 Major Characteristics of SWIR radiometer 
Band Center (um) Width(um) NEdR  IFOV : 30 m, 42.6 urad 
Swath width : 60 km 
4 1.655 0. 100 <0. 5% Quantization : 8 bit 
hreo 5 2. 165 0. 040 <1. 3% Pointing : +/-8. 55 deg. 
TIR 6 2.205 0. 040 «1. 39 
of 7 2. 260 0. 050 «1.39 
8 2.330 0. 070 «1. 096 
9 2. 395 0. 070 «1. 3X 
opic 
ight 
2 a 
rack Table 3 Major characteristics of TIR radiometer 
tion 
able Band Center(um) Width(um) NEdT  IFOV : 90 m, 127.8 urad 
led. 
been 10 8. 30 0.350 «0. 3K Swath width : 60 km 
sach 11 8. 65 0. 350 «0. 3K Quantization : 12 bit 
a 12 9. 10 0. 350 «0. 3K Dynamic range : 200 — 370 K 
as 13 10. 60 0. 700 <0. 3K Pointing : 4/—8. 55 deg. 
the 14 11. 30 0. 700 «0. 3K 
uate 
t a 
nC Table 4 Major parameters for ASTER stereoscopic viewing 
T 
ajor Satellite altitude:H-705km, Velocity - 7.51 km/s 
Band(Wave length region):Band 3(0.76 — 0.86um) 
may IFOV:A-15m for nadir viewing 
Base height ratio with fore and nadir looking:B/H=0. 6 
+/- d 
Definition of one scene:60km x 60km 
Pointing angle in direction of cross track:+/-8. 54deg. 
MTF:0.25 for nadir viewing 
Requirement of attitude change in pitch(the dominant 
angle for DEM estimation) = 4.4 arcsec/9sec (Baseline) 
= 2.2 arcsec/9sec (Option) 
Requirement of attitude change in roll 
= 8.8 arcsec/9sec (Basel ine) 
= 4.4 arcsec/9sec(Option) 
Requirement of attitude change in yaw 
= 52 arcsec/9sec (Baseline) 
= 26 arcsec/9sec(Option) 
Bias pointing error such as miss-alignment will be corrected 
through a statistical analysis on geometric accuracy 
‚ion. 
  
991