Saleem Sahawneh, S. Farrar, James E. Johnson, W. Jones, J. Roberts, S. Biswas, D. Cecil
{"title":"Hurricane Imaging Radiometer wind speed and rain rate retrievals during the 2010 GRIP flight experiment","authors":"Saleem Sahawneh, S. Farrar, James E. Johnson, W. Jones, J. Roberts, S. Biswas, D. Cecil","doi":"10.1109/MICRORAD.2014.6878914","DOIUrl":"https://doi.org/10.1109/MICRORAD.2014.6878914","url":null,"abstract":"Microwave remote sensing observations of hurricanes, from NOAA and USAF hurricane surveillance aircraft, provide vital data for hurricane research and operations, for forecasting the intensity and track of tropical storms. The current operational standard for hurricane wind speed and rain rate measurements is the Stepped Frequency Microwave Radiometer (SFMR), which is a nadir viewing passive microwave airborne remote sensor [1]. The Hurricane Imaging Radiometer, HIRAD, will extend the nadir viewing SFMR capability to provide wide swath images of wind speed and rain rate, while flying on a high altitude aircraft. HIRAD was first flown in the Genesis and Rapid Intensification Processes, GRIP, NASA hurricane field experiment in 2010. This paper reports on geophysical retrieval results and provides hurricane images from GRIP flights. An overview of the HIRAD instrument and the radiative transfer theory based, wind speed/rain rate retrieval algorithm is included. Results are presented for hurricane wind speed and rain rate for Earl and Karl, with comparison to collocated SFMR retrievals and WP3D Fuselage Radar images for validation purposes.","PeriodicalId":309298,"journal":{"name":"2014 13th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127411216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"On the computation of the path delay in deep space missions applications by means of a scalar radiometric-based indicator","authors":"A. Bosisio, V. Mattioli, A. Graziani, P. Tortora","doi":"10.1109/MICRORAD.2014.6878916","DOIUrl":"https://doi.org/10.1109/MICRORAD.2014.6878916","url":null,"abstract":"The estimation of the path delay due to water vapor is a crucial aspect for the calibration of the Doppler observables of a deep space probe. The Advanced Water Vapor Radiometer (AWVR), developed by the Jet Propulsion Laboratory (JPL, NASA), already proved its capability to accurately estimate the path delay during the entire Cassini mission. Here, from the AWVR measurements, a scalar Sky Status Indicator (SSI) was developed as a criterion for selecting the radiometric path delay estimations in the orbit determination process. Results indicate that the use of such index allows a reduction of Doppler residual root mean square.","PeriodicalId":309298,"journal":{"name":"2014 13th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129015592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Hallikainen, M. Vaaja, Jaakko Seppanen, A. Hakkarainen, J. Kainulainen
{"title":"Brightness temperature of snow on lake ice in the 1.4 to 36.5 GHz range","authors":"M. Hallikainen, M. Vaaja, Jaakko Seppanen, A. Hakkarainen, J. Kainulainen","doi":"10.1109/MICRORAD.2014.6878909","DOIUrl":"https://doi.org/10.1109/MICRORAD.2014.6878909","url":null,"abstract":"We have investigated the brightness temperature behavior of snow on lake ice by conducting airborne radiometer measurements over two lakes in southern Finland since 2004 and, with a more intense schedule, since 2011. The flight path includes two lakes of different sizes and, additionally, a forested area and an open, mostly agricultural area next to the lakes. This allows us to compare the behavior of the brightness temperature of snow on lake ice with that of snow on terrain. The main airborne instrument is our HUTRAD system, which operates at 6.9, 10.65, 18.7, 23.8, and 36.5 GHz, providing data for both vertical and horizontal polarization at an incidence angle of 50 degrees off nadir. The antenna beamwidth is 3 to 5 degrees depending on frequency. Additional data have been collected with our HUT-2D interferometric imaging radiometer, which operates at 1.4 GHz and looks straight down covering an incidence angle range up to 25 degrees with a swath of 95 per cent of the flight altitude. The radiometers are accommodated on our Skyvan research aircraft. Insitu measurements have been made simultaneously with airborne data collection. We have covered a variety of conditions including dry snow/ice, occasional water on top of ice, moist snow surface, and the melting season. In order to study the effect of diurnal temperature variations during the melting season we have collected data both in the morning (dry refrozen snow) and afternoon (moist topmost snow layer).","PeriodicalId":309298,"journal":{"name":"2014 13th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad)","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127187107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lin Wu, I. Corbella, F. Torres, N. Duffo, M. Martín-Neira
{"title":"Faraday rotation angle retrieval using SMOS radiometric data","authors":"Lin Wu, I. Corbella, F. Torres, N. Duffo, M. Martín-Neira","doi":"10.1109/MICRORAD.2014.6878926","DOIUrl":"https://doi.org/10.1109/MICRORAD.2014.6878926","url":null,"abstract":"SMOS radiometric data is used to derive Faraday rotation for a number of orbits combining several scenarios: land, ice and water. Results compare very well with the values theoretically predicted from available ionosphere and geomagnetic field data.","PeriodicalId":309298,"journal":{"name":"2014 13th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133278462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Analysis and characterization of the reconstruction error in interferometric synthetic aperture imaging radiometers","authors":"R. Díez-García, M. Martín-Neira","doi":"10.1109/MICRORAD.2014.6878927","DOIUrl":"https://doi.org/10.1109/MICRORAD.2014.6878927","url":null,"abstract":"The European Space Agency (ESA) Soil Moisture and Ocean Salinity mission (SMOS) is intended to provide global maps of soil moisture and ocean surface salinity. Its payload MIRAS (Microwave Imaging Radiometer with Aperture Synthesis) is an L-band interferometric radiometer which achieves unprecedented resolution. It was successfully launched in November 2009 under the European Space Agency Earth Explorers program, and has since been acquiring high resolution images whose accuracy, precision and stability have been steadily improved. Although the analysis presented here has been done in the framework of SMOS, the conclusions are also valid for other types of missions using Synthetic Aperture Radiometers for observing planetary surfaces from space.","PeriodicalId":309298,"journal":{"name":"2014 13th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad)","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133962060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Scattering by large periodic surfaces: Novel numerical method and applications","authors":"M. Maas, O. Bruno, F. Grings","doi":"10.1109/MICRORAD.2014.6878920","DOIUrl":"https://doi.org/10.1109/MICRORAD.2014.6878920","url":null,"abstract":"We present a novel numerical method that enables efficient computation of scattering and emisivity of natural and manmade surfaces arising in the field of remote sensing. We consider periodic surfaces of possibly very large period, to adequately capture the various scales present in them, and we apply our method to study the effect on radar polarization ratios of the presence of a tilling structure in an otherwise random rough surface.","PeriodicalId":309298,"journal":{"name":"2014 13th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad)","volume":"192 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121025592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ruiyao Chen, A. Santos-Garcia, S. Farrar, W. Jones
{"title":"Assessment of the long-term radiometric calibration stability of the TRMM microwave imager and the WindSat Satellite Radiometers","authors":"Ruiyao Chen, A. Santos-Garcia, S. Farrar, W. Jones","doi":"10.1109/MICRORAD.2014.6878936","DOIUrl":"https://doi.org/10.1109/MICRORAD.2014.6878936","url":null,"abstract":"The NASA's Global Precipitation Measurement (GPM) mission uses a constellation of international satellites with microwave radiometers, to provide the next-generation of global observations of precipitation. The GPM Intersatellite Calibration Working Group (aka XCAL) has the responsibility to perform the radiometric calibration process to normalize all radiometers to a common source, the GPM Microwave Imager, which serves as a radiometric transfer standard. Prior to the launch of GPM instrument on February 28, 2014, the Tropical Rainfall Measurement Mission (TRMM) Microwave Imager has been used as a proxy for the GMI to develop procedures and data analysis algorithms for inter-comparing two similar, but not identical, radiometers. In this regard, this paper assesses the long-term radiometric calibration stability of TMI relative to WindSat polarimetric radiometer. CFRSL conducted two independent inter-comparisons over oceans in XCAL year (July 2005 - June 2006) and C Y 2011, and results are presented, which demonstrate deciKelvin relative stability over this greater than five-year period.","PeriodicalId":309298,"journal":{"name":"2014 13th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130110486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"An imaging algorithm for synthetic aperture interferometric radiometers with built-in RFI mitigation","authors":"Adriano Camps, H. Park, V. González-Gambau","doi":"10.1109/MICRORAD.2014.6878904","DOIUrl":"https://doi.org/10.1109/MICRORAD.2014.6878904","url":null,"abstract":"Radio Frequency Interference (RFI) is probably one of the most important limiting factors in the accuracy of the brightness temperatures measured by microwave radiometers. Due to the proximity of the “protected” L-band (1400-1427 MHz) to numerous services (communication, localization, broadcast...), this band is seriously affected by RFI, preventing ESA's SMOS mission or NASA/CONAE Aquarius mission from retrieving soil moisture and ocean salinity over large areas of the world. In this work, a technique is presented as an attempt to mitigate the RFI at its origin, when the synthetic aperture image is being formed. The technique is based on the well-known beam- and null-steering techniques used in today's advanced communication systems, but generalized to the synthetic aperture case, by means of the so-called equivalent array factor, which allows to interpret the “synthetic aperture array” as a “real aperture array” with an antenna in the position of each baseline.","PeriodicalId":309298,"journal":{"name":"2014 13th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132868909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Cimini, O. Caumont, U. Lohnert, Lucas Alados-Arboledast, T. Huet, M. Ferrario, F. Madonna, A. Haefele, F. Nasir, G. Pace, R. Posada, R. Bleisch
{"title":"A data assimilation experiment of temperature and humidity profiles from an international network of ground-based microwave radiometers","authors":"D. Cimini, O. Caumont, U. Lohnert, Lucas Alados-Arboledast, T. Huet, M. Ferrario, F. Madonna, A. Haefele, F. Nasir, G. Pace, R. Posada, R. Bleisch","doi":"10.1109/MICRORAD.2014.6878913","DOIUrl":"https://doi.org/10.1109/MICRORAD.2014.6878913","url":null,"abstract":"Temperature and humidity retrievals from an international network of ground-based microwave radiometers (MWR) have been collected to exploit the potential for data assimilation into Numerical Weather Prediction (NWP) modeling. This activity is carried on in the framework of the Hydrological cycle in the Mediterranean Experiment (HyMeX). The domain under analysis is the HyMeX West Mediterranean (WMed) target area, using data assimilation tools developed for the Météo-France Arome-WMed NWP system. In this paper we introduce the data set, discuss results concerning the observation-background statistics, and present preliminary results on the impact of MWR data assimilation into NWP.","PeriodicalId":309298,"journal":{"name":"2014 13th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125466288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Aquarius retrieval of sea ice thickness: Initial results","authors":"P. de Matthaeis, C. Utku, D. L. Le Vine, A. Moyer","doi":"10.1109/MICRORAD.2014.6878910","DOIUrl":"https://doi.org/10.1109/MICRORAD.2014.6878910","url":null,"abstract":"Aquarius brightness temperature data are used to calculate sea ice thickness in the Arctic region. The method is based on the inversion of a radiative transfer model for ice-covered sea. Using this technique, the initial sea ice thickness values retrieved from Aquarius data are compared to the SMOSIce Data as well as to estimates from NASA's Operation IceBridge. The results show similar trends between the SMOS- and Aquarius-derived sea ice thickness, however the Aquarius estimates tend to be higher and noisier than the corresponding SMOS values. The accuracy of retrieved Aquarius ice thickness is possibly influenced by uncertainties in the ancillary input parameters and by the coarser resolutions of Aquarius.","PeriodicalId":309298,"journal":{"name":"2014 13th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123744989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}