1. FY-3 MWRI -Calibration and Time Series Record
Shengli Wu and Fenglin Sun
National Satellite Meteorological Center
XinXin Xie, Jiakai He and Hongxin Xu
Shanghai Institute of Space Communication Technology
Frascati Italy
2019/03/06

2. Contents FY-3D/MWRI Status Improvement of Cold Target filter
Improvement of A/D bias correction
Inter-calibration with GMI
Time Series Data Record
Conclusion

3. FY-3D/MWRI Status

4. NeDT
Channel
89V
89H
36V
36H
23V
23H
18V
18H
10V
10H
FY-3A
0.67
0.58
0.31
0.33
0.38
0.44
0.43
FY-3B
0.55
0.64
0.26
0.24
0.36
0.35
0.37
0.30
FY-3C
0.41
0.27
0.39
0.40
0.42
0.29
FY-3D
0.23
0.34
0.28

5. Cold Target filter

6. Cold Target Irregular Points Ground Position（10V/10H/18V/18H）

7. EU:10.65GHz/US:18.7GHz Satellite Location Frequency TelStar18 138E
12.5
TelStar12
15W
11.5
TelStar11
37.5W
11.7
Hotbird
13E
11.6
TelStar14R
63W
12.2
AnikF1R
107.3W
AnikF2
111.1W
AnikF3
118.7W
DirecTV10
103W
19.1
DirecTV11
99W
18.5
SpaceWayF1
102.8W

8. Before and after filter

9. Reflector emission (Using RTTOV and T639)
“Real” BT
MWRI BT
nonlinear
Back lobe
Ascending/Descending Bias =warm reflector emission+cold reflector emission

10. Warm/cold reflector emission(Emi V1.0)b Y X1 X2

11. Warm/cold reflector emission(Emi V 2.0)
Consider the material and technology of warm and cold reflectors, only emissivity of warm reflector could be changed on orbit (or larger than the aluminum emissivity in the very beginning).
Ɛ of pure aluminum
Tested Ɛ
(cold sky mirror)
10.65 GHz
18.7 GHz
23.8 GHz
36.5 GHz
89 GHz
For “real” BT, b should be 0

12. Distribution of A/D Bias
FY-3C Bias
FY-3C Emi V 2.0
FY-3C Emi V 1.0

13. Hot Reflector Emissivity of FY-3C/MWRI and FY-3D/MWRI

14. FY3D A/D Bias VS Lat
FY3D A/D Bias

15. SNO With GMI 15Min,75x75Km Std<1K (20180101-20181231)

16. A/D Bias using O-B (from MetOffice)

17. FY-3/MWRI launch schedule
Shut down:
2008:FY-3A(10-89GHz, Dul-p);
Operational：
2010:FY-3B(10-89GHz, Dul-p);
2013:FY-3C(10-89GHz, Dul-p);
2017:FY-3D(10-89GHz, Dul-p);
Schedule:a
2020:FY-3F(Reflector increased from 1m to 1.8m);
2021:FY-3P(Precipitation Satellite, Lower orbit, Reflector increased from 1m to 1.6m);
2022:FY-3G(Reflector increased from 1m to 1.8m);
The emissivity of reflector will be much improved for these 3 sensors.

18. Time Series Data Record
FY-3B：

19. Recalibration of MWRI MWRI CDR (2010-2020)
Individual Problems (Back lobe, A/D Bias etc)
Quality Contral (RFI, Solar, Luna)
Re-Calibration of single Sensor (AGC point change etc)
Re-Calibration of different Sensors (using FY-3D/MWRI as the reference sensor)
Experiment on sensor or land surface
Confirm the calibration result using GMI or other sensor
Recalibration of MWRI
MWRI CDR
( )

20. Individual Problems
Periodic and Non-periodic Noise (RFI\Solar\Lunar etc)
Antenna correction improvement(using RTM or GMI)
Hot load correction improvement(reflector and back lobe)
Cold target stability
Receiver performance (non-linear factor) with the change of environment temperature and AGC
Ta normalization according to Slightly change of EIA (for environmental parameters retrieval usage)

21. Data record re-call Amazon Tefe National forest
（64.82W-66.82W，4.55S-6.55S）。

22. Bt Time series
10H
10V
18H
18V
23H
23V
36H
36V
89H
89V

23. FY-3/MWRI VS AMSR2 and GMI
FY-3B VS AMSR2
89H Land
FY-3B VS GMI
89H Land

24. Next Step
Non-linear correction improvement based on the status of AGC and receiver temperature;
Cold reflector measurement on ground, to get a more accurate emissivity (Experiment in preparing: using a huge metal bucket aiming to sky);
Cold target stability analysis (34points for cold target measurement);
Reprocessing of FY-3B/MWRI and FY-3C/MWRI, apply the corrections have been used on FY-3D/MWRI;
Investigate the long-term difference between FY-3B/MWRI and GMI/AMSR2 separately.

25. Thanks