On the potential of sub-mm passive MW observations from  geostationary satellites to retrieve heavy precipitation over the  Mediterranean Area

Pinori, S.; Baordo, F.; Medaglia, Carlo Maria; Mugnai, A.; Bizzarri, B.

doi:10.5194/adgeo-7-387-2006

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…However, it is also due to the fact that these frequencies are rather low compared to the other millimeter and sub‐millimeter channels and penetrate deeper into the clouds. Discussions about the respective role of the H 2 O and O 2 sounding channels [e.g., Pinori et al , 2006] should make clear that part of the merit of the O 2 sounding channels as compared to the H 2 O channels is due to the fact that the O 2 lines at 50 and 118 GHz are located at lower frequencies than the H 2 O lower frequency line for sounding (183 GHz), thus providing a deeper penetration within the cloud structure. Note that the 118 GHz channels alone (F18) perform almost within the thresholds in the absence of noise but exhibits the worst performances when realistic noises are considered.…”

Section: Classification Resultsmentioning

confidence: 99%

Development of precipitation retrievals at millimeter and sub‐millimeter wavelengths for geostationary satellites

Defer¹,

Prigent²,

Aires³

et al. 2008

J. Geophys. Res.

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[1] We study the potential of millimeter and sub-millimeter wavelengths for precipitation retrieval from geostationary sensors based on mesoscale cloud modeling and radiative transfer computation. Hydrometeor profiles simulated with the Meso-NH cloud resolving model for five European midlatitude situations are used to compute the brightness temperatures at frequencies from 23.8 to 875 GHz with the Atmospheric Transmission at Microwaves (ATM). Performances of both rain detection and rain rate retrieval are analyzed for different frequency sets, over ocean and land separately, and compared to the user requirements. The performances of a frequency set such as that already planned for geostationary satellites (with channels in the O 2 lines at 50, 118, and 424 GHz, and in the H 2 O lines at 183, 325, 380 GHz) satisfy the requirements for Numerical Weather Prediction and NoWCasting in terms of rain detection as well as for rain rate retrieval above 1 mm/h. Suppressing the 50 GHz O 2 channels does not seriously degrade the performances, except for rain rate below 1 mm/h, and, in addition, limits the spatial resolution problem from a geostationary orbit. Adding the thermal infrared observations has a limited impact. The retrieval of other hydrometeor quantities (cloud, ice) is also tested as well as the possibility to retrieve rain and the other hydrometeor profiles. These theoretical results are evaluated at close-to-millimeter wavelengths with coincident AMSU-B and radar observations (BALTEX and CAMRa). The results are degraded with respect to the theory, as expected, but are consistent with the observations.

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Section: Classification Resultsmentioning

confidence: 99%

Development of precipitation retrievals at millimeter and sub‐millimeter wavelengths for geostationary satellites

Defer¹,

Prigent²,

Aires³

et al. 2008

J. Geophys. Res.

View full text Add to dashboard Cite

show abstract

“…Because the synthetic-aperture system is inferior to the real-aperture system in terms of system complexity and calibration, scan flexibility, and real-time sounding of dynamic time-varying targets (e.g., clouds, rain, and atmosphere), none of the above projects have entered the space-borne stage. The real-aperture schemes are represented by GEM [ 14 ] from the U.S., GOMAS [ 15 , 16 , 17 ] from the E.U., and GeoMWR [ 18 ] from China. However, due to technical difficulties in the large-aperture antenna, such as processing and manufacturing, assembly and unfolding, mechanical scanning, radiometric calibration, and on-board thermal distortion compensation, the above projects also remain in the scheme design stage.…”

Section: Introductionmentioning

confidence: 99%

A Rapid Beam Pointing Determination and Beam-Pointing Error Analysis Method for a Geostationary Orbiting Microwave Radiometer Antenna in Consideration of Antenna Thermal Distortions

Tong

2021

Sensors

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When observing the Earth’s radiation signal with a geostationary orbiting (GEO) mechanically scanned microwave radiometer, it is necessary to correct the antenna beam pointing (ABP) in real time for the deviation caused by thermal distortions of antenna reflectors with the help of the on-board Image Navigation and Registration (INR) system during scanning of the Earth. The traditional ABP determination and beam-pointing error (BPE) analysis method is based on the electromechanical coupling principle, which usurps time and computing resources and thus cannot meet the requirement for frequent real-time on-board INR operations needed by the GEO microwave radiometer. For this reason, matrix optics (MO), which is widely used in characterizing the optical path of the visible/infrared sensor, is extended to this study so that it can be applied to model the equivalent optical path of the microwave antenna with a much more complicated configuration. Based on the extended MO method, the ideal ABP determination model and the model for determining the actual ABP affected by reflector thermal distortions are deduced for China’s future GEO radiometer, and an MO-based BPE computing method, which establishes a direct connection between the reflector thermal distortion errors (TDEs) and the thermally induced BPE, is defined. To verify the overall performance of the extended MO method for rapid ABP determination, the outputs from the ideal ABP determination model were compared to calculations from GRASP 10.3 software. The experimental results show that the MO-based ABP determination model can achieve the same results as GRASP software with a significant advantage in computational efficiency (e.g., at the lowest frequency band of 54 GHz, our MO-based model yielded a 4,730,000 times faster computation time than the GRASP software). After validating the correctness of the extended MO method, the impacts of the reflector TDEs on the BPE were quantified on a case-by-case basis with the help of the defined BPE computing method, and those TDEs that had a significant impact on the BPE were therefore identified. The methods and results presented in this study are expected to set the basis for the further development of on-board INR systems to be used in China’s future GEO microwave radiometer and benefit the ABP determination and BEP analysis of other antenna configurations to a certain extent.

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Scan Planning Optimization for 2-D Beam Scanning Using a Future Geostationary Microwave Radiometer

Shang

Yang

et al. 2021

IEEE Trans. Aerosp. Electron. Syst.

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On the potential of sub-mm passive MW observations from geostationary satellites to retrieve heavy precipitation over the Mediterranean Area

Cited by 3 publications

References 11 publications

Development of precipitation retrievals at millimeter and sub‐millimeter wavelengths for geostationary satellites

Development of precipitation retrievals at millimeter and sub‐millimeter wavelengths for geostationary satellites

A Rapid Beam Pointing Determination and Beam-Pointing Error Analysis Method for a Geostationary Orbiting Microwave Radiometer Antenna in Consideration of Antenna Thermal Distortions

Scan Planning Optimization for 2-D Beam Scanning Using a Future Geostationary Microwave Radiometer

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