GOSAT TANSO-FTS Polarization Model Description

Transcription

1 GO TANO-FT Polaization odel Descition June, Contact: Refeence Kuze et al.,al. Otics, 48,, (9).

2 TANO-FT Otics cene flux fom nadi Dee sace view Black body view Diffused sola flux CO Camea 96 by 4 ixels Fold mio Pointing and image motion comensation Pelaunch Radiometic Calibation light Redundant system Aetue sto (Cube Cone) GO-= Otical P Collecting mio +Y(itch) Field sto DF DF DF3 +X(oll) Collimating mio BPF i (B)P, BPF BPF3 InGaAs with TEcoole (B) P, InGaAs with TEcoole (B3) P, (B4) on Dewa and Pulse Tube Coole GO & TANO Coodination (ight hand)

3 TANO Coodination P P +Z +X +Y Pointing echanism Coodination Command and Raw telemety +Y(Pitch) +X(Roll) +Z(Yaw) GO & TANO-FT Coodination P P Raw telemety data fom onboad esolves use P coodination. LB data uses GO & TANO-FT coodination. Uses do not have to conside P coodination. TANO-CAI Pixel 48 (B,,3) 5 (B4) P IC ID=5 Cloud and aeosol hase function P>> IC ID=5 IC ID=3 Noth LO P IC ID= IC ID= Cloud and aeosol hase function CA-H8 Rotated by 9 deg clockwise P TANO-CAI Pixel Euato West un glint TANO-FT Polaization easuement outh P LO P East Day-side 3

4 Pointing Coodination P P +Z +X +Y Pointing echanism Coodination Command and Raw telemety +Y (Pitch) +X (Roll) +Z (Yaw) GO & TANO-FT Coodination P P LB : Otical angles ae saved in GO-TANO Coodination =+ deg (otical angle = line of site = Level data ) (incident angle of 55 deg) =+ deg (mechanical angle)(fowad looking) -axes Pointing io (L angle)/ FT Otics Incident angle Fowad looing GO diection 4

5 P& Definition GO definition : P Pimay econday ( can be used as edundancy Otical Definition: Geman wods enkecht (eendicula) Wave, Paallelität (aallel) Wave Instument (mio) Otical P=GO P GO P has much highe efficiency than GO (Zne B efficiency) P Obsevation (suface) Otical P = GO GO P = Otical GO-= Otical P 5

6 6 ectal database () Pointing mio suface eflectivity (measued data).99 ) ( // R InstumentP.996 ) ( R Instument / m TANO-FT Band P** deg = GO P (when looking Nadi) ** Deg = GO (when looking nadi)

7 ectal database () FT beam slitte (simulated data) 7

8 ectal database (3) Phase of Pointing mio suface (measued data) ajo Phase ouce of TANO FT otical comonents is fom suface coating of the ointing mio The deviation fom ideal mio hase π (8deg) is smalle than deg at incident angle of 3 deg. 8

9 Phase of Pointing mio suface coating (olaimete) Newly develoed Polaimete fo hase measuements fo GO wavelength egion (visible and WIR)(coves TANO-FT B,, 3) Fo Both mio (eflection )and filte samles (tansmission) Incident angle ange (fom 3 to 6 deg) uelle matix 6 elements sectal chaacteistics Phase calculation softwae 9

10 io Phase easuement Configuation (olaimete) amle mio eflectivity > P Reflectivity Incident Angle 45deg Inut light fom Polaimete Reflected light to Polaimete Polaimete Oiginal (deg) Ideal io ain Axis(deg) (Delayed axis) Diffeence (deg) Raw Polaimete Value (Calculated fom AN, 8deg max) (76 nm) -88 (6nm) 6 (76 nm) 55 (6 nm) Actual (Coected) - - (76 nm) 55 (6 nm)

11 Ratio Ratio ectal database (4) OPT (excluding P) /P atio() Calculated fom elaunch calibation data P atio R R els el / / Ps P Pelaunch Calibation Coefficient R el Pointing io eflectivity P AFTotics (aft ot, detecto, am) /P atio wavenumbe (cm-) AFTotics (aft ot, detecto, am) /P atio wavenumbe (cm-) P + fold mio + FT- + aft-otics + detecto +Peam ainly deendent on the dichoic filte shae and eamlifie feedback gain. (When you use both P and elaunch calibation data, the above data ae not necessay.)

12 TANO-FT-system uelle atix Euations in Alied Otics need to be coected. Poutut outut s ot ot m inut m inut Coection Poutut ot m inut outut s ot m inut m is function of, This otion has to be consideed to aly the elaunch calibation data

13 3 TANO-FT-system uelle atix Aft otics Actual Otics / ot ot otp ot AFT otics has hase diffeence but NO imact on uelle matix / / s ot

14 Coodination of inut tokes aamete and fowad calculation (RT model) fo Consistency TANO FT Inut tokes Vecto RT coodination Plane includes the sun, glint oint, and the satellite. +Y(Pitch) West P +X +Z +Y P GO P band Linea Polaized cos 4 sin 4 GO band Linea Polaized s cos 4 sin 4 +X(Roll) +Z(Yaw) Rotation by -θ atellite Coodination Nadi b LOP cos( )cos( ) cos( )sin( )( sin( cos ( sin( )) )) b LO sin( )cos( ) sin ( )( sin( )) sin cos ( sin( )) 4

15 5 Ideal Pointing io Case of hase = 8 deg (ideal eflection) & % eflectivity FTinut m ot Poutut cos sin sin cos t cos sin sin cos cos 4 sin 4 sin 4 cos 4 cos sin sin cos cos sin sin cos cos sin sin cos cos sin sin cos t t t t t cos 4 sin 4 sin 4 cos 4 cos sin sin cos cos sin sin cos t t t sin 4 cos 4 P Poutit sin 4 cos s outit

16 Relative TANO-FT-system uelle atix (olaization model) Polaization Axis ummay TANO-FT PF Linea Polaization Inut imulato deg deg P.8 Line of site P axis axis LO-X. P-X.946 -X LO-Y.36 P-Y Y.89 P-P extinction.8%. LO-Z.946 P-Z.6 -Z -.3 -P-extinction 3.68% P Phase Plate Rotation * (deg) -E-6 Easy Polaization model with Excel Fo monochomatic calculation only uelle atix Inut Ty: Tyical E: Eo - Function of angle Best Estimage Value ovided fo uses Rotation -9 deg.... cos sin sin t cos deg incident 35 deg incident 55 deg incident easued m Function of angle, wavelength B B B3 B B B3 B B B3 Ra Tyical Re Tyical m E m / E easued & deg incident 35 deg incident 55 deg incident Best m Function of wavelength estimate B B B3 B B B3 B B B3 Phase 5.7 deg Band Ct m.... E hot Edge cos sin Long Edge sin cos Polaimete easuements (witness) Aug Function of angle (back to the oiginal coodinate) Rotation 9 deg m easued & deg incident 35 deg incident 55 deg incident Best cos sin estimate B B B3 B B B3 B B B sin t cos Band Ct 97.4 #N/A #N/A 9.8 #N/A #N/A 4.74 #N/A #N/A E #N/A #N/A #N/A #N/A #N/A #N/A fm 9 deg otated P hot Edge 98.8 #N/A #N/A 9.4 #N/A #N/A 7.63 #N/A #N/A Ta Long Edge 96. #N/A #N/A 9.9 #N/A #N/A.99 #N/A #N/A Te Fujinon(witness) Pe-launch fmm fm Function of wavelength Phase -5.7 deg fmfmm ao Function of Wavelength B B B3 Ta Tyical... Te Tyical aofmfmm E ot / E ao assumed to be vey small Phase 8 deg aaofmfmm Fixed aaofmfmm / s Fixed saaofmfmm s /

17 Pe-launch test configuation Inut fom Nadi, Radiometic Calibation: un-olaized light inut I=,Q=U=V= no olaize Polaization ensitivity(see the figue below): olaize and hase late (otating) V= Pelaunch Calibation Table ae made fom Poutut and soutut with inut of inut (,,, ) TANO-FT OPT +Y +X +Z(nadi) / hase late(otation) Light ouce Polaize Polaization sensitivity measuement configuation 7

18 How to aly Pe-launch Calibation data inut(atio) TANO-FT OPT Polaization model (dimensionless) P + fold mio + FT- + aft-otics + detecto +Peam +Y Integating shee (nadi data only) +X +Z(nadi) m inut ( atio) all(, inut ( atio) (,), Poutut( Ratio) ot ) Above configuation Poutut( Ratio) all Pelaunch Calibation Coefficient R el (elation between adiance (W/cm/st/cm-) and Level B (V/cm-) ' Poutut( V / cm ) ( all ( ' inut adiance) ' [] ReL ' inut( adiance) [], Poutut( V / cm all ) ' [] donates the element (scala value) of the vecto and matix [] ) I ( : well and coss-calibated value inut( adiance) R el (,), (, )) 8

19 Coodination of the outut of the adiative tansfe model TANO-FT OPT +Y +X GO = TANO coodinates +Z(nadi) +Y +X lant looking (we assume RT 3 AXE ae in TANO coodinates) cos sin cos sin +Z(nadi) Nadi GO=TANO coodinates = RT coodinates P olaization Fom to of Atmoshee +Y (RT) +X +Z (RT) olaization We assume RT coodinates otates when TANO measues slant aths. (X-axis otation only) 9

20 Gound footint +Y(Pitch) +X(Roll) +Z(Yaw) GO & TANO-FT Coodination sin( ) sin( )cos( ) cos( )cos( ) Line of site = LB +Y(Pitch) +Y +X(Roll) +Z +X(Roll) +Z(Yaw) P RT Coodination RT Coodination (at nadi)=go & TANO- FT Coodination b LOP cos( )cos( ) cos( )sin( )( sin( cos ( sin( )) Nadi )) b LO Two linea olaization diections in GO & TANO-FT Coodination sin( )cos( ) sin ( )( sin( )) sin cos ( sin( )) East Day-side

21 Aendix

22 RRV data P vs. Path 36 and 37 Band /P atio Path 37 has lage /P atio than Path 36