on_the_development_of_dualfrq_pr_china(tiger).ppt
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Development Of Space-borne Rain Radar In China: The First Results From Airborne Dual-Frequency Rain
Radar Field Campaign
Hu Yang, Honggang Yin, Jian Shang Qiong Wu, Yang Guo, Beidou Zhang
National Satellite Meteorological Center
July 26,2011
IGARSS’2011
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Contents
• In t r o d u c t io n o f M e t e o r o lo g ic a l S a t e l l i t e d e v e lo p m e n t in c h in a
• D e v e lo p m e n t s t a t u s o f F Y3 ( 0 2 ) d u a l-f r e q u e n c y R a in R a d a r
• F ie ld c a m p a ig n r e s u l t s
• c o n c lu s io n
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Roadmap of FenYun satelliteRoadmap of FenYun satellite
Science Target: Globalall weather, multispectral3D detection
2006FY-2D
2007FY-3A (TEST)
2010FY-2F
2008FY-2E
2009FY-3B (TEST)
2011FY-3AM12012FY-3PM1
2012FY-2G2013FY-4A (TEST)
2013FY-3RM (TEST)
2015FY-4EAST1
2014FY-3AM2
2017FY-3AM3
2015FY-3PM2
2016FY-4WEST1
2017FY-4MS (TEST)
2018FY-3PM3
2016FY-3RM12019FY-3RM2
2019FY-4EAST2
2020FY-4WEST2
2020FY-4MS
2008FY3A
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Orbit coverage in FY3(02) Era
FY3-Am + FY3-PM + FY3-RM will consist polar orbit earth observation constellation, combined with GPM satellites, provide Globe 3-hourly high accuracy precipitation products.
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Introduction of China Spaceborne Precipitation Radar Introduction of China Spaceborne Precipitation Radar
The main objectives of RM satellite:
Consist a Global observation constellation system with FY3-2 AM and PM satellites, as well as GPM satellite;
Improve the severe convective system monitoring ability in china together with GPM satellite;
Provide 3D precipitation structure over both Provide 3D precipitation structure over both ocean and land;ocean and land;
Improve the sensitivity and accuracy of Improve the sensitivity and accuracy of precipitation measurement over china and precipitation measurement over china and arrounding area;arrounding area;
• Instruments onboard the PR satellite platform• Core instrument: Ku/Ka Radar
• Microwave sounder
• MWTS : centre frequencies set at 50.3,51.76,52.8,53.596,54.4,54.94,55.50,57.29GHz
• MWHS : centre frequencies set at 89.0,118.75±0.2, ±0.3, ±0.8, ±1.1, ±2.5, ±3.0, ±5.0,150,183.31±1, ±1.8, ±3, ±4.5, ±7
• Microwave imager
• MWRI : Centre frequencies set at 10.65,18.7,23.8,36.5,89GHz, with V/H polarization
KaPR
KuPR
MWRI
MWTS
MWHS
MWRI
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M a in In s t r u m e n t M a in In s t r u m e n t C h a r a c t e r is t ic sC h a r a c t e r is t ic s
KuPR KaPR
Frequency 13.6 GHz 35.5 GHz
Scan angle ±20º
Horizontal resolution 5 km (nadir)
Range resolution 250m
Observation range 18 km~-5 km
sensitivity 0.5 mm/h 0.2 mm/h
Antenna Side lobe level -35 dB - 30dB
Range side lobe -70dB -60dB
accuracy ≤ ±1 dB
Independent sampling number ≥ 64
Calender Year 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
Ku/Ka PR Conceptual Design Preliminary Design/Airborne flight Critical Design Sustaining Design Launch
Gound System Conceptual Design System Design System integeration Operation
Algorithm Conceptual Design Prototype Development Development Validation
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Ground weather RadarZGnd
Rain profile
ZAPR
Inversion algorithm
APR calibration
Attenuation CorrectionZe
Rain profile
Inversion algorithm
Attenuation CorrectionZe
Radar simulator
APR rain measurements simulation database
TRMM-PR rain products( 2A25 )
TRMM-PRZPR
JS-RM2010 Dual-frequency Rain Radar Field Campaign
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Ku Ka
Fly height 5km 5km
Frequency 13.6GHz 35.5GHz
Swath width 3.6km 3.6km
Observation range 4km ~ -3km ASL 4km ~ -3km ASL
Horizontal resolution 240m 240m
Vertical resolution 250m 250m
sensitivity 0.25mm/h 0.1mm/h
Sample rate 64 64
Beam width 2.9°× 2.9° 2.9°× 2.9°Scan angle range ±20° ±20°Dynamical range ≥70dB ≥70dB
ADPR(Ku/Ka) Instrument characteristics
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Dual-Frequency Radar Airborne Field Campaign (JS-RM2010)Jun-Oct, 2010
Ku Radar Ka Radar
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Ocean surface radar backscattering characteristics
Comparing with TRMM-PR measurements over ocean surface shows that the loss of antenna radome is obvious, and the attenuation is angle dependence.
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Calibration accuracy evaluation by using TRMM-PR measurements
1.Ku radar ocean sigma0 from TRMM-PR
2. Ku band ocean surface roughness parameter from TRMM-PR
3. Ku/Ka ocean surface roughness difference
4. Ka band ocean surface roughness from Ku measurments
5. Ka band ocean surface sigma0 from model
ADPR Ku radar Cal/val by using
TRMM-PR
ADPR Ka Radar cal/val
Ocean sigma0 from model
computation
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Antenna radiom Loss correction
The rms error of model computation is 0.78dB
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ADPR antenna Loss model
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TRMM-PR Measurements over Test Area
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ADPR Calibration Accuracy Evaluation Results
Mean bias = 0.046
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• Carborne meteorological radar:
– X-band, 9.375GHz
– 1.5°
– Volume scan
– 150m
• TRMM PR:
– Ku-band, 13.6GHz
– 0.71°
– Cross-track scan, 49 angle bins per scan
– 4.3km / 5km, 0.25km
Satellite-Airplane-Ground Radar Zm Profile comparison
Volume Scan
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K u b a n d m e a s u r e m e n ts
Rain profile measurements comparison with TRMM-PR
K a b a n d m e a s u r e m e n ts
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Time difference is about 40 minutesMeasurements from 1.5-5Km above surface is consistent with each other, both in height and Z value;The ADPR derived Ze under 1.5Km is effected by surface return signal.
ADPR rain profile Comparison with TRMM-PR
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Airplane-ground comparison
Airplane attitude correction
Processing procedures
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Airplane-ground comparison
Vertical sections of airborne radar
and ground radar
Left : airborne Ku/Ka-band precipitation radar
Right : carborne X-band meteorological radar
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Airplane-ground comparison
Observation time 2010-10-11, 09:52:06~10:02:24
Matched points 4684
Maximum (dBZ)
Ku : 25.77
Ka : 25.07
X : 30.50
Minimum (dBZ)
Ku : -7.82
Ka : -10.07
X : 4.00
Mean (dBZ)
Ku : 16.38
Ka : 14.55
X : 19.22
RMS
Ku vs. Ka : 1.84
Ku vs. X : 6.75
Ka vs. X : 7.51
Correlation coefficient
Ku vs. Ka : 0.98
Ku vs. X : 0.53
Ka vs. X : 0.53
Quantitative
comparison
results
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detection sensitivity
[Ku] The minimum detectable rain rate of airborne Ku-band radar is 0.15mm/h, which satisfies the desired performance of 0.25mm/h.
[Ka] The minimum detectable rain rate of airborne Ka-band radar is 0.13mm/h, which is a little worse than the desired performance of
0.10mm/h. Given the rain attenuation and the radome’s influence, the sensitivity of Ka-band radar basically satisfies the desired performance.
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sidelobe
[Ku] The sidelobe of Ku-band radar is lower than -60dB, which satisfies the desired performance.
[Ka] The sidelobe of Ka-band radar is lower than -50dB, which is a little worse than the desired performance.
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range resolution
[Ku] Actual 6dB range resolution of Ku-band radar is better than 250m, which satisfies the desired performance.
[Ka] Actual 6dB range resolution of Ka-band radar is better than 250m, which satisfies the desired performance.
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• The radar reflectivity factor profiles of ADPR and TRMM PR
are highly consistent, which proves ADPR’s measuring
accuracy.
• Field Campaign results shows that ADPR basically satisfy the
desired performance.
• The dual-frequency precipitation radar is qualified for the
development of future spaceborne dual-frequency
precipitation radar in China.
Conclusion
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…… …… S t o p H e r eS t o p H e r e