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- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Effective Prediction of Transmission of Solar Irradiance through Dusty Solar Panels using Atmospheric Aerosol Data for Lahore, Pakistan
摘要： Soil moisture retrievals, delivered as a CATDS (Centre Aval de Traitement des Données SMOS) Level-3 product of the Soil Moisture and Ocean Salinity (SMOS) mission, form an important information source, particularly for updating land surface models. However, the coarse resolution of the SMOS product requires additional treatment if it is to be used in applications at higher resolutions. Furthermore, the remotely sensed soil moisture often does not reflect the climatology of the soil moisture predictions, and the bias between model predictions and observations needs to be removed. In this paper, a statistical framework is presented that allows for the downscaling of the coarse-scale SMOS soil moisture product to a finer resolution. This framework describes the interscale relationship between SMOS observations and model-predicted soil moisture values, in this case, using the variable infiltration capacity (VIC) model, using a copula. Through conditioning, the copula to a SMOS observation, a probability distribution function is obtained that reflects the expected distribution function of VIC soil moisture for the given SMOS observation. This distribution function is then used in a cumulative distribution function matching procedure to obtain an unbiased fine-scale soil moisture map that can be assimilated into VIC. The methodology is applied to SMOS observations over the Upper Mississippi River basin. Although the focus in this paper is on data assimilation applications, the framework developed could also be used for other purposes where downscaling of coarse-scale observations is required.
关键词： microwave radiometry,soil moisture,Hydrology
更新于2025-09-19 17:13:59
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Measurement and Analysis of Radiation Calibration Uncertainty of Multi-Band Polarization Imager
摘要： The principle of multi-band polarization imager is introduced. In order to verify the accuracy, instrument was tested and analyzed by radiation calibration. The radiation calibration accuracy is better than 2%, which meets the design requirements.
关键词： Polarimetry,Radiometry,Visible Spectroscopy
更新于2025-09-16 10:30:52
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[IEEE 2019 Workshop on Research, Education and Development of Unmanned Aerial Systems (RED UAS) - Cranfield, United Kingdom (2019.11.25-2019.11.27)] 2019 Workshop on Research, Education and Development of Unmanned Aerial Systems (RED UAS) - A multi-UAS system for the inspection of photovoltaic plants based on the ROS-MAGNA framework
摘要： Some applications of data from the Clouds and the Earth’s Radiant Energy System (CERES) scanning radiometer require the use of the point response function (PRF), which describes the in?uence of radiance from each point on the measurement. A radiance source for the measurement of the PRF of the CERES instruments was built and installed into the Radiometric Calibration Facility, in which the CERES instruments have been calibrated. The design and application of the PRF source and the computation of the PRF from these measurements are described. In order to compare the PRF based on measurements with the theoretical PRF, it is necessary to account for the ?nite size of the beam from the source. The use of the PRF source and the analysis of the data are demonstrated by application to the FM-5 instrument. The measured results compare well with theory for the CERES instruments and are presented for FM-5.
关键词： Aqua,Terra,point spread function,radiometry,Earth radiation budget,point response function (PRF),calibration,Clouds and the Earth’s Radiation Energy System (CERES),National Polar-orbiting Partnersship (NPP)
更新于2025-09-16 10:30:52
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A Hexagonal Pseudo-polar FFT for Formation-Flying Interferometric Radiometry
摘要： A novel mission concept applying satellite formation flight to passive microwave interferometry was recently proposed to significantly improve the interferometer’s spatial resolution. This concept was shown to sample the visibility in a hexagonal tile of polar grids, and to recover the brightness map, this visibility must be inverted via a discrete polar inverse Fourier transform. For a fast and accurate solution, this letter develops a modified hexagonal variant of the pseudo-polar fast Fourier transform (PPFFT) and its inverse and explores its performance when applied to the proposed formation-flight radiometer. Compared to the conventional rectangular PPFFT, we find approximately a fivefold improvement in the recovered radiometric accuracy, where the rms radiometric error is in the order of 10?2 K. The impact of visibility interpolation method is also explored, showing that an FFT-based interpolation technique leads to the most accurate final image recovery.
关键词： mission concept,synthetic aperture imaging,microwave radiometry,Image reconstruction,satellite formation flight
更新于2025-09-11 14:15:04
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Traceable Analog Detector for Quantum Radiometry
摘要： This paper presents an analog detector that is directly traceable to the traditional optical radiometry primary standard at the level of 100 μW and performs as the transfer standard detector for measurements of photon flux levels of about one hundred thousand photon/s with an uncertainty below 2%. The detector has been successfully applied in a range of measurements that used to be considered exclusively accessible to quantum photon counting detectors.
关键词： Radiometry,measurement techniques,measurement standards,Quantum Radiometry
更新于2025-09-10 09:29:36
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Smos Instrument Performance After More Than 8 Years in Orbit and Lessons Learnt for Future L-Band Missions
摘要： ESA’s Soil Moisture and Ocean Salinity (SMOS) mission [1] has been in orbit for over 8 years, and its Microwave Imaging Radiometer with Aperture Synthesis (MIRAS) in two dimensions is working well. The data for this whole period has been and is being processed with the operational version of the current Level-1 processor (version v620). Also a representative part of the same data set has been processed with a working version of a new processor (v720) which is now in preparation so that homogenous records of brightness temperatures have been made available. These rich and long data records have allowed learning important lessons from the in-flight experience, and shall eventually lead into the consolidation of the new Level-1 processor version (v720) with its corresponding auxiliary calibration and configuration files. Once the improvements are confirmed the new processor version shall be recommended for the operational chain.
关键词： interferometry,radiometry,aperture synthesis,SMOS
更新于2025-09-10 09:29:36
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Geophysical Relationship between Cygnss GNSS-R Bistatic Reflectivity and Smap Microwave Radiometry Brightness Temperature Over Land Surfaces
摘要： This work presents an assessment on the correlation between CyGNSS-derived Global Navigation Satellite Systems Reflectometry (GNSS-R) bistatic reflectivity rl? and SMAP-derived brightness temperature BT, over land surfaces. This parametric-study is performed as a function of Soil Moisture Content (SMC), and vegetation opacity τ. Several target areas are selected to evaluate potential differentiated geophysical effects on “active” (as many transmitters as navigation satellites are in view), and passive approaches. Although microwave radiometry has potentially a better sensitivity to SMC, the spatial resolution is poor ~ 40 km. On the other hand, GNSS-R bistatic coherent radar footprint is limited by half of the first Fresnel zone which provides about ~ 150 m of spatial resolution (depending on the geometry). The synergetic combination of both techniques could provide advantages with respect to active monostatic Synthetic Aperture Radar (SAR).
关键词： vegetation opacity,CyGNSS,GNSS-R,land,microwave radiometry,SMAP,multi-static radar,Soil Moisture Content (SMC)
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Single-Photon Avalanche Detector Calibration at PTB
摘要： In this paper we present the traceable calibration of the detection efficiency of Si and InGaAs/InP single-photon avalanche detectors (SPADs). We describe the calibration facilities and the reference standard detectors used, as well as the traceability chain of the measurements to the primary standard for optical power (Cryogenic Radiometer) of PTB. As an example, the detection efficiency of a Si and InGaAs/InP SPAD detector measured at wavelengths of 850 nm and 1550 nm, respectively, for different photon flux rates is presented. The standard uncertainty of the measurements is ≤ 1 %.
关键词： Single-photon detectors,radiometry,calibration
更新于2025-09-10 09:29:36
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Smart Plant Factory (The Next Generation Indoor Vertical Farms) || Reconsidering the Terminology and Units for Light and Nutrient Solution
摘要： Technical terms and units used for light and nutrient solution that are sometimes misunderstood or confusing are discussed, and more uni?ed terminology and units are proposed for better communication and understanding among people with different academic and business backgrounds.
关键词： Photonmetry,Equivalent,Valence,Radiometry,Photometry
更新于2025-09-10 09:29:36
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Calibration Challenges for the Biomass P-Band SAR Instrument
摘要： The BIOMASS mission gives completely new challenges in external calibration arising from the orbital pattern needed for the tomographic and Pol-InSAR phases of the mission, the strong effects of the ionosphere at P-band, and the lack of pre-existing P-band data except over very limited parts of the globe. Together these create problems that can only be solved by combining infrequent visits to instrumented calibration sites with systematic exploitation of the properties of distributed targets and targets of opportunity. Proposed approaches to performing radiometric and polarimetric calibration are described, together with meeting geolocation accuracy requirements.
关键词： calibration,Radiometry,ionospheric correction,geolocation,polarimetry
更新于2025-09-09 09:28:46