1. Presentation Overview
Ref:LunarCalibWS_Guideline_Presentations
-General description of the sensor (spectral bands, orbit, resolution, etc.)
- Description of the Moon acquisition (manoeuvre)
- Example of an image: how does the Moon look like?
- Dark signal correction
- Absolute calibration (calibration methods)
- Integration step
- Oversampling consideration
- Satellite position
- Operation of the GIRO: status and calibration results
- Feedback for discussions

2. Bandwidth per band (nm) = 20, 20, 20, 20, 20, 20, 30, 40;
General description of the sensor (spectral bands, orbit, resolution, etc.)
Parameters
Specifications
Instantaneous geometric field of view (meters)
360 (m) across track (at nadir)
236 (m) along track
Number of Detectors in array
6024
Active pixels
3730
Integration time
34.75 m sec
Swath
1420 km
Spectral band (micron)
B – 0.422
B – 0.453
B – 0.500
B – 0.520
B – 0.565
B – 0.630
B – 0.755
B – 0.885
Saturation radiance
(mW/cm2/sr/μm) B B B B B B B B
Camera MTF (at Nyquist)
> 0.2
SWR at Nyquist
> 0.26
Band to Band Registration
 0.25 pixels
Quantization
12 Bits
SNR (at saturation)
> 512
Along track steering
 200
Central wavelengths per band (nm) = 412, 443, 490, 510, 555, 620, 740, 865;
Bandwidth per band (nm) = 20, 20, 20, 20, 20, 20, 30, 40;
Instantaneous field-of-view = mrad;
Pixels per scan = 3730;
Scan rate = 28.78/sec;
Sample rate= /sec

3. Description of the Moon acquisition (manoeuvre)
Step1 : Target the Center CCD to a point 2.0deg (Pitch bias 2.0 deg) Above the Moon center
Step2 : Provide Pitch Scan Rate of d/s for 80 secs
Step 3 : Reverse Rotation to Earth

4. ( Full operation in eclipse)
Time Line Diagram
( Full operation in eclipse)
Eclipse Entry
AOS
Scan start
Scan End
Start of Reverse Rotation
Normalization
Eclipse exit
LOS
18:00:03
18:01:00
18:09:30
18:11:00
18:12:20
18:12:30
18:22:30
18:23:00
18:35:18
18:43:03

5. Example of an image: how does the Moon look like?

6. --Oversampling factor (OSF consideration)
- Integration step
Identification of lunar pixels by including all pixels with a specified number of standard deviations outward from the mean of the centrally selected area.
Get the weighted sum of radiance from the histogram of selected lunar pixels
Convert radiance (L) to irradiance (I) as
I=L*pi()*(theta)as*(theta)xs
Where theta = Altitude/GIFOV in along scan(as) and across scan (xs) direction
--Oversampling factor (OSF consideration)
OSF=(pixels)as /(pixels)xs assuming moon as circle
- Satellite position
Orbital vector in J2000 for moon central scanline

7. OCM-2 Lunar Irradiance calculation
Sum Radiance
I = L*Omega
I (for GIRO)
mW/cm2/um/sr
mW/cm2/um
W/m2/um
Solid Angle calculation
Direction
IGFOV (m)
IFOV (rad)
Omega AS
360
0.0005
E-07 XS
236
Altitude
720000

8. - Operation of the GIRO: status and calibration results
Lunar data converted to netCDF using IDL code with Compulsory inputs and some additional information
GIRO (2nd release) could be run successfully
Yet to be done:
Including imagette in netCDF format
Testing GIRO (4th) release

9. Thanks for your kind attention
My Special thanks to
-Sebastien Wagner and the team working behind-the-scene for ensuring this workshop
-Masaya Takahashi, specially for prompt netCDF related support
-Director, Space Applications Centre (ISRO), for his whole hearted support
Thanks for your kind attention