calibration and instrument status of adeos-ii global...
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Calibration and instrument status of ADEOS-II Global Imager
September 8,2003SPIE Remote Sensing 2003
GLI Calibration TeamS. Kuriharaa, H. Murakamib, K. Tanakaa, H. Hashimotob, I. Asanumab, J. Inouec
a NASDA ADEOS-II Project,b NASDA EORC
c NASDA EOC
GLI : Global Imager
• Multi spectral optical imager with wide FOV on ADEOS-II• Global observation succeeding OCTS on ADEOS platform.
+X
+Y+Z
Sea Winds
AMSR
ILAS-II
POLDER
GLI
Specification
1.25 mrad (1km resolution, 30ch)
0.3125 mrad (250m resolution, 6ch)
Instantaneous Field Of View (IFOV)
-20deg, 0deg, +20degTilt Angle
+/- 45 deg
(1600km cross track swath)
Field Of View (FOV)
4dayRepeat period
3.3~12 micron (total 7 channels)Middle Thermal infrared channels (MTIR)
1.1~2.2 micron (total 6 channels)Short Wave infrared channels (SWIR)
380~865 nm (total 23 channels)Visible Near infrared channels (VNIR)
GLI on-orbit initial checkout
▲Safety Mode
CAL/VALphase
Milestone ▲
Launch Dec 14
(~ Jan 10)
2003
AprMar
2002
Dec Jan Feb
check out phase
Critical phase
Jun
Apr 14▽
GLICheckout Jan 10▲
Cool Down
#1 C/O
Jan 24-26
#2 C/O
2/6-7
2/12,15,22,25▲ △ ▲ △A B A B
Lamp Calibration
3/7▲Lamp Calibrationvia DRTS
System Total Test
Initial critical phase (to Dec 17)
May Jul Aug Sep Oct Nov Dec
Operationalphase
▲Today
CAL/VAL activity
GLI first ImageJan. 25 2003
Instruments Status (1/2)
-25℃
-20℃
-15℃
-10℃
-5℃
0℃
5℃
10℃
15℃
20℃
25℃
30℃
DIS
P TE
MP
PELT
IER
RA
DTE
MP
OTC
TEM
P
SCA
N M
TR T
EMP
SCA
N E
NC
TEM
P
TILT
MTR
TEM
P
BB
C T
EMP
45 M
IRR
OR
TEM
P
LAM
P TE
MP1
LAM
P TE
MP2
LEN
S TE
MP1
(MT-
Lens
)
LEN
S TE
MP6
(VN
2-Le
ns)
VN
-DET
1 TE
MP
VN
-DET
2 TE
MP
SW-D
ET1
TEM
P
ASP
TEM
P2
MT-
PRE
TEM
P3
Max (On orbit). Min. (On orbit) Analysis Cold Analysis Hot
• ALL GLI commands is successfully executed through all initial checkout activities and routine operation.
• All GLI temperature and currents are equivalent to the pre-launch testing and/or predictions within allowable limits with proper margin.
GLI component temperatures during 19-22 March (System total test).
Instruments Status (2/2)
-5
0
5
10
11-Jan
18-Jan
25-Jan
1-Feb
8-Feb
15-Feb
22-Feb
1-M
ar
8-M
ar
15-M
ar
22-M
ar
29-M
ar
5-A
pr
12-A
pr
19-A
pr
26-A
pr
3-M
ay
10-M
ay
17-M
ay
24-M
ay
31-M
ay
7-Jun
14-Jun
21-Jun
28-Jun
5-Jul
GL4151 SCAN ENC TEMP (Max.) GL4151 SCAN ENC TEMP (Min.)
GLI’s temperature is stable in routine operation.
Example of GLI’s telemetry: Scan encoder temperature
VN/SW Band
• Dynamic Range and Linearity– Equivalent to pre-launch ground test data
• Non-Linearity, Over-saturation– Equivalent to pre-launch ground test data – data is “tailing” in non-linear region– required for the detailed analysis for non-linear region response.– detailed analysis is on-going as a Cal/Val phase activity
• Strip pattern noise– Mirror side difference is stronger than detector response deviation for data
striping– detailed analysis is on-going as a Cal/Val phase activity
• Long term sensitivity– detector sensitivity is stable according to on board calibration data
Over saturation & tailing
Over saturation
GLI
DN
Radiance
GLI
DN
Input radiance
Tailing
GLI
DN
RadianceScanning Direction Linear Max
Over saturation Tailing Over saturation+Tailing
Non-linear region
• Over saturation: DN decreased when input radiance increased in non-linear region at VNIR2 band•Tailing: Increasing input DN when detector is continued to input radiance of saturation region
0
500
1000
1500
2000
2500
3000
3750 3800 3850 3900 3950 4000 4050 4100 4150
ch18出力 (深宇宙補正前) [DN]
ch19出
力 (
深宇
宙補
正前
) [D
N]
Over saturation
Over saturation & tailing (Example)
Ch18 (High gain) Cf. Ch19 (Low gain)
tailing
Over saturation
These phenomena is found in only non-liner region.
Same wavelength (866nm)
Noise (Strip pattern)
• 1) Detector sensitivity error• 2) Mirror side difference error• 3) Electric error (MT band only)
Strip pattern noise appears in GLI image.
Error 2) is greater than Error 1)
Detector sensitivity error
0.96
0.98
1
1.02
1.04
1.06
1.08
Det1 Det2 Det3 Det4 Det5 Det6 Det7 Det8 Det9Det1
0Det1
1Det1
2
Detector
Ratio
to d
et. 7
ch10 Solar cal ch10 Earth observationch10 Ground test
The detector sensitivity error differs from the error by earth observation and by solar calibration about 1 or 2%.
Mirror side difference error
Mirror side B/ Mirror side A
0.95
0.96
0.97
0.98
0.99
1
1.01
1.02
1.03
1.04
0 50 100 150 200
Day from launch
Ratio
to 1
2/14
/200
2ch2(400nm)
ch6(490nm)ch10(625nm)
ch15(710nm)
ch19(865nm)ch26(1240nm)
Ground test data
Mirror side difference error on orbit differs from it on pre-launch test data.
Lamp data
Correction of strip pattern noise
GLI L1B data will be carried out de-striping
Original L1B image De-striping L1B image
Strip noise (problem)
• Strip pattern correction is not perfect because of mirror side difference• Stray light may cause change of mirror side difference
Observation image in CH18 when moon light incidented through deep
space window
The mirror side A (Red) is about two times bigger than it of mirror
side B (Blue).
Long term sensitivity (Solar Calibration)
• The change ratio at mirror side A on CH 2 (400nm) and CH 26 (1240nm) decrees about 10% and 2% respectively for 140 days
• The shorter wavelength is faster degradation than longer wavelength.• The change ratio at mirror side B is bigger than it at mirror side A
Sun Calibration trend (Sun EL 15 deg mirror side A)
0.88
0.9
0.92
0.94
0.96
0.98
1
1.02
0 50 100 150 200
Day from launch
Ratio
to 1
/26/
2003
ch2
ch6
ch10
ch15
ch19
ch26
Sun Calibration trend (Sun EL 15 deg mirror side B)
0.88
0.9
0.92
0.94
0.96
0.98
1
1.02
0 50 100 150 200
Day from launchRa
tio to
1/2
6/20
03
ch2
ch6
ch10
ch15
ch19
ch26
Long term sensitivity (Lamp calibration)
• The DN of lamp in orbit is different from ground test data.• Data of mirror side A is increasing, but data of mirror side B is
decreasing
Internal Lamp A mirror side A
0.94
0.96
0.98
1
1.02
1.04
1.06
1.08
0 50 100 150 200
Day from launch
Ratio
to g
roun
d te
st da
ta
ch2(400nm)
ch6(490nm)
ch10(625nm)
ch15(710nm)
ch19(865nm)
ch26(1240nm)
Internal Lamp A mirror side B
0.96
0.98
1
1.02
1.04
1.06
1.08
0 50 100 150 200
Day from launch
Ratio
to G
roun
d te
st da
tach2(400nm)ch6(490nm)ch10(625nm)ch15(710nm)ch19(865nm)ch26(1240nm)
Ground test data
•Lamp data remain stable on orbit•Solar data decrease(Degradation of diffuser ? No degradation of GLI output ?)
We consider GLI is stable by on board calibration data(Vicarious calibration data show other results ? )
We continue to more detail study this topic.
Long term sensitivity (Summary)
Lamp rate - Sun rate
-0.14
-0.12
-0.1
-0.08
-0.06
-0.04
-0.02
0
300 500 700 900 1100 1300
Wave Length (nm)
Rate
of c
hang
e fr
om 1
/26/
2003
to15
/6/2
003
Lamp A Mirror side A
Lamp A Mirror side B
Lamp B Mirror side A
Lamp B Mirror side B
Degradation
0.86
0.88
0.9
0.92
0.94
0.96
0.98
1
1.02
1.04
300 500 700 900 1100 1300 1500
Wave Length (nm)
Rat
e o
f chan
ge f
rom
1/26/2003 t
o15/6/2003
Lamp mirror sideA
Lamp mirror sideB
Solar mirrror side A
Solar mirror side B
Vicarious calibration result (long term trend)
Temporal change Vicarious calibration by SeaWiFS and simulation(SPIE, San Diego 2003,5155-10 H.Murakami)
Ch1 Degradation?
Cross calibration over snow fields near Barrow, Alaska(SPIE, San Diego 2003,
5151-46, Nieke)
Degradation?
MT band
• Detector Response– Equivalent to pre-launch ground test data– detailed analysis is on-going as a Cal/Val phase activity
• Strip pattern noise– Strip noise in MT band is smaller than it in VN/SW band – Electric noise appear
• Black Body Calibration– Black Body Calibration function is confirmed– 2 points calibration method (deep space & black body) functions properly.– Calibration coefficients are stable
Electric noise
•Detector and mirror side noise can be corrected, but electrical noise remain after the current de-striping process on MT band.
Original image De-striping image
MT calibration coefficients trend
Ch36 C1' trend Det1 Mirror side A Scene 1
99.60%
99.80%
100.00%
100.20%
100.40%
100.60%
100.80%
Jan
-03
Feb-
03
Feb-
03
Mar
-03
Apr
-03
Apr
-03
May
-03
Jun-03
Jun-03
Jul-
03
Aug-
03
Rat
io t
o 2
5 J
an. 2003
Initial check out
•The calibration coefficients are stable. •The change is within 0.2% at ch 36 in a day.
CH C1' 30 3.5% 31 0.5% 32 0.4% 33 0.3% 34 0.2% 35 0.2% 36 0.2%
Change of coefficient in a day
- 1 0
- 5
0
11-Jan
18-Jan
25-Jan
1-Feb
8-Feb
15-Feb
22-Feb
1-M
ar
8-M
ar
15-M
ar
22-M
ar
29-M
ar
5-A
pr
12-A
pr
19-A
pr
26-A
pr
3-M
ay
10-M
ay
17-M
ay
24-M
ay
31-M
ay
7-Jun
14-Jun
21-Jun
28-Jun
5-Jul
G L 4 1 3 1 B B C T E M P ( M a x .) G L 4 1 3 1 B B C T E M P ( M in .)
Geometric status
Refer to Con. 5234A-07 (today 11:10AM)
Pre launch test parameter Updated parameter
The geo location errors are about 2 samples using pre launch alignment data.
We will update alignments parameter in the next L1 software version.
Summary
• All GLI components status are normal within the predicted ranges. • Output level and calibration coefficients is stable.• Several sensor characteristics analysis is on-going for the CAL/VAL
phase activity, such as;– Non-Linearity Response– Mirror side difference and destriping– sensor degradation– Vicarious calibration– others
• The target for these analysis is GLI data delivery to the public at the end of this year