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Toshio Iguchi - One of the best experts on this subject based on the ideXlab platform.

  • calibration of the dual frequency Precipitation radar onboard the global Precipitation Measurement core observatory
    2020
    Co-Authors: Takeshi Masaki, K. Furukawa, Toshio Iguchi, Takuji Kubota, Kaya Kanemaru, Naofumi Yoshida, Riko Oki
    Abstract:

    This article describes four-year calibration results of the dual-frequency Precipitation radar (DPR) onboard the Global Precipitation Measurement (GPM) Core Observatory. The calibration method basically follows the method that was used to calibrate the Precipitation radar (PR) onboard the Tropical Rainfall Measuring Mission (TRMM) satellite. However, both the hardware and data processing method for calibration are improved by taking advantage of the lessons learned from the PR's calibration. Since the response of the radar receivers was found to depend on the waveform, the active calibrator was improved in such a way that the external calibration can be performed with both continuous and pulse waves. The methods for evaluating the calibration data were also improved. Instead of assuming a Gaussian antenna pattern, the effective beamwidths were determined by assuming an antenna pattern created by the Taylor distribution that was used to design the antennas. The results of the calibration including these improvements provide the new precise parameters of DPR's calibration. The new parameters increased the Ku-band Precipitation radar's (KuPR's) radar reflectivity factor (Z) by about 1.3 dB and that of the Ka-band Precipitation radar (KaPR) by about 1.2 dB from the precalibrated Z values, and the minimum detectable radar reflectivities were 15.46, 19.18, and 13.71 dBZ for KuPR, matched beam of KaPR, and high-sensitivity beam of KaPR, respectively. After applying the new calibration methods to both DPR and PR, normalized radar cross sections (σ₀) from the DPR and PR agree with each other.

  • dual frequency Precipitation radar dpr on the global Precipitation Measurement gpm mission s core observatory
    2020
    Co-Authors: Toshio Iguchi
    Abstract:

    This chapter describes major specification of the Dual-Frequency Precipitation Radar (DPR) onboard the Global Precipitation Measurement (GPM) Mission’s core observatory, and the specific algorithm that is used to retrieve Precipitation rate from its data. Emphasis is on the level 2 algorithm that retrieves instantaneous rainfall profiles. Major functions of the six modules that form the level 2 algorithm and special features in the dual-frequency algorithm are described.

  • prime mission results of the dual frequency Precipitation radar on the global Precipitation Measurement core spacecraft and the version 5 gpm standard products
    2017
    Co-Authors: K. Furukawa, Riko Oki, Takuji Kubota, Tomomi Nio, Toshio Iguchi
    Abstract:

    The Dual-frequency Precipitation Radar (DPR) on the Global Precipitation Measurement (GPM) core satellite was developed by Japan Aerospace Exploration Agency (JAXA) and National Institute of Information and Communications Technology (NICT). The objective of the GPM mission is to observe global Precipitation more frequently and accurately. The GPM core satellite is a joint product of National Aeronautics and Space Administration (NASA), JAXA and NICT. NASA developed the satellite bus and the GPM Microwave Imager (GMI), and JAXA and NICT developed the DPR. The inclination of the GPM core satellite is 65 degrees, and the nominal flight altitude is 407 km. The non-sunsynchronous circular orbit is necessary for measuring the diurnal change of rainfall. The DPR consists of two radars, which are Ku-band Precipitation radar (KuPR) and Ka-band Precipitation radar (KaPR). GPM core observatory was successfully launched by H2A launch vehicle on Feb. 28, 2014. DPR orbital check out was completed in May 2014. DPR products were released to the public on Sep. 2, 2014 and Normal Observation Operation period was started. JAXA is continuing DPR trend monitoring, calibration and validation operations to confirm that DPR keeps its function and performance on orbit. The results of DPR trend monitoring, calibration and validation show that DPR kept its function and performance on orbit during the 3 years and 2 months prime mission period. The DPR Prime mission period was completed in May 2017. The version 5 GPM products were released to the public in 2017. JAXA confirmed that GPM/DPR total system performance and the GPM version 5 products achieved the success criteria and the performance indicators that were defined for the JAXA GPM/DPR mission.

  • prime mission results of the dual frequency Precipitation radar on the global Precipitation Measurement core spacecraft and the version 5 gpm standard products
    2017
    Co-Authors: K. Furukawa, Takuji Kubota, Toshio Iguchi
    Abstract:

    The Dual-frequency Precipitation Radar (DPR) on the Global Precipitation Measurement (GPM) core satellite was developed by Japan Aerospace Exploration Agency (JAXA) and National Institute of Information and Communications Technology (NICT). The objective of the GPM mission is to observe global Precipitation more frequently and accurately. The GPM core satellite is a joint product of National Aeronautics and Space Administration (NASA), JAXA and NICT. NASA developed the satellite bus and the GPM Microwave Imager (GMI), and JAXA and NICT developed the DPR. The inclination of the GPM core satellite is 65 degrees, and the nominal flight altitude is 407 km. The non-sunsynchronous circular orbit is necessary for measuring the diurnal change of rainfall. The DPR consists of two radars, which are Ku-band Precipitation radar (KuPR) and Ka-band Precipitation radar (KaPR). GPM core observatory was successfully launched by H2A launch vehicle on Feb. 28, 2014. DPR orbital check out was completed in May 2014. DPR products were released to the public on Sep. 2, 2014 and Normal Observation Operation period was started. JAXA is continuing DPR trend monitoring, calibration and validation operations to confirm that DPR keeps its function and performance on orbit. The results of DPR trend monitoring, calibration and validation show that DPR kept its function and performance on orbit during the 3 years and 2 months prime mission period. The DPR Prime mission period was completed in May 2017. The version 5 GPM products were released to the public in 2017. JAXA confirmed that GPM/DPR total system performance and the GPM version 5 products achieved the success criteria and the performance indicators that were defined for the JAXA GPM/DPR mission.

  • the global Precipitation Measurement gpm mission for science and society
    2017
    Co-Authors: Gail Skofronickjackson, George J. Huffman, Walter A Petersen, Chris Kidd, Ramesh K Kakar, Wesley Berg, Dalia Kirschbaum, Erich Franz Stocker, Scott A Braun, Toshio Iguchi
    Abstract:

    The GPM mission collects essential rain and snow data for scientific studies and societal benefit.

Gail Skofronickjackson - One of the best experts on this subject based on the ideXlab platform.

  • the global Precipitation Measurement gpm mission
    2020
    Co-Authors: Gail Skofronickjackson
    Abstract:

    Water is essential to our planet Earth. Knowing when, where and how Precipitation falls is crucial for understanding the linkages between the Earth's water and energy cycles and is extraordinarily important for sustaining life on our planet during climate change. The Global Precipitation Measurement (GPM) Core Observatory spacecraft launched February 27, 2014, is the anchor to the GPM international satellite mission to unify and advance Precipitation Measurements from a constellation of research and operational sensors to provide “next-generation” Precipitation products. GPM is currently a partnership between NASA and the Japan Aerospace Exploration Agency (JAXA). Status and successes over the past seven years in terms of spacecraft, instruments, retrieval products, validation, and impacts for science and society will be presented.

  • satellite estimation of falling snow a global Precipitation Measurement gpm core observatory perspective
    2019
    Co-Authors: Gail Skofronickjackson, Stephen J. Munchak, Mark Kulie, Lisa Milani, Norman B Wood, Vincenzo Levizzani
    Abstract:

    Retrievals of falling snow from space-based observations represent key inputs for understanding and linking Earth's atmospheric, hydrological, and energy cycles. This work quantifies and investigates causes of differences among the first stable falling snow retrieval products from the Global Precipitation Measurement (GPM) Core Observatory satellite and CloudSat's Cloud Profiling Radar (CPR) falling snow product. An important part of this analysis details the challenges associated with comparing the various GPM and CloudSat snow estimates arising from different snow-rain classification methods, orbits, resolutions, sampling, instrument specifications, and algorithm assumptions. After equalizing snow-rain classification methodologies and limiting latitudinal extent, CPR observes nearly 10 (3) times the occurrence (accumulation) of falling snow as GPM's Dual-Frequency Precipitation Radar (DPR). The occurrence disparity is substantially reduced if CloudSat pixels are averaged to simulate DPR radar pixels and CPR observations are truncated below the 8-dBZ reflectivity threshold. However, even though the truncated CPR- and DPR-based data have similar falling snow occurrences, average snowfall rate from the truncated CPR record remains significantly higher (43%) than the DPR, indicating that retrieval assumptions (microphysics and snow scattering properties) are quite different. Diagnostic reflectivity (Z)-snow rate (S) relationships were therefore developed at Ku and W band using the same snow scattering properties and particle size distributions in a final effort to minimize algorithm differences. CPR-DPR snowfall amount differences were reduced to ~16% after adopting this diagnostic Z-S approach.

  • the global Precipitation Measurement gpm mission s scientific achievements and societal contributions reviewing four years of advanced rain and snow observations
    2018
    Co-Authors: Gail Skofronickjackson, George J. Huffman, Walter A Petersen, Chris Kidd, Dalia Kirschbaum, Erich Franz Stocker, Ramesh K Kakar
    Abstract:

    Precipitation represents a life-critical energy and hydrologic exchange between the Earth’s atmosphere and its surface. As such, knowledge of where, when, and how much rain and snow falls is essential for scientific research and societal applications. Building on the 17-year success of the Tropical Rainfall Measurement Mission (TRMM), the Global Precipitation Measurement (GPM) Core Observatory (GPM-CO) is the first U.S. National Aeronautical and Space Administration (NASA) satellite mission specifically designed with sensors to observe the structure and intensities of both rain and falling snow. The GPM-CO has proved to be a worthy successor to TRMM, extending and improving high-quality active and passive microwave observations across all times of day. The GPM-CO launched in early 2014, is a joint mission between NASA and the Japanese Aerospace Exploration Agency (JAXA), with sensors that include the NASA-provided GPM Microwave Imager and the JAXA-provided Dual-frequency Precipitation Radar. These sensors were devised with high accuracy standards enabling them to be used as a reference for inter-calibrating a constellation of partner satellite data. These intercalibrated partner satellite retrievals are used with infrared data to produce merged Precipitation estimates at temporal scales of 30 minutes and spatial scales of 0.1° x 0.1°. Precipitation estimates from the GPM-CO and partner constellation satellites, provided in near real time and later reprocessed with all ancillary data, are an indispensable source of Precipitation data for operational and scientific users. Advances have been made using GPM data, primarily in improving sensor calibration, retrieval algorithms, and ground validation Measurements, and used to further our understanding of the characteristics of liquid and frozen Precipitation and the science of water and hydrological cycles for climate/weather forecasting. These advances have extended to societal benefits related to water resources, operational numerical weather prediction, hurricane monitoring, prediction, and disaster response, extremes, and disease.

  • global Precipitation Measurement gpm unified Precipitation estimation from space
    2018
    Co-Authors: Gail Skofronickjackson, George J. Huffman, Walter A Petersen, Wesley Berg, Christopher Kidd, Dalia Kirschbaum, Yukari N Takayabu
    Abstract:

    Global Precipitation Measurement (GPM) is an international satellite mission that uses Measurements from an advanced radar/radiometer system on a Core Observatory as reference standards to unify and advance Precipitation estimates through a constellation of research and operational microwave sensors. GPM is a science mission focusing on a key component of the Earth’s water and energy cycle, delivering near real-time observations of Precipitation for monitoring severe weather events, freshwater resources, and other societal applications. This work presents the GPM mission design, together with descriptions of sensor characteristics, inter-satellite calibration, retrieval methodologies, ground validation activities, and societal applications.

  • the global Precipitation Measurement gpm mission for science and society
    2017
    Co-Authors: Gail Skofronickjackson, George J. Huffman, Walter A Petersen, Chris Kidd, Ramesh K Kakar, Wesley Berg, Dalia Kirschbaum, Erich Franz Stocker, Scott A Braun, Toshio Iguchi
    Abstract:

    AbstractPrecipitation is a key source of freshwater; therefore, observing global patterns of Precipitation and its intensity is important for science, society, and understanding our planet in a changing climate. In 2014, the National Aeronautics and Space Administration (NASA) and the Japan Aerospace Exploration Agency (JAXA) launched the Global Precipitation Measurement (GPM) Core Observatory (CO) spacecraft. The GPM CO carries the most advanced Precipitation sensors currently in space including a dual-frequency Precipitation radar provided by JAXA for measuring the three-dimensional structures of Precipitation and a well-calibrated, multifrequency passive microwave radiometer that provides wide-swath Precipitation data. The GPM CO was designed to measure rain rates from 0.2 to 110.0 mm h−1 and to detect moderate to intense snow events. The GPM CO serves as a reference for unifying the data from a constellation of partner satellites to provide next-generation, merged Precipitation estimates globally and ...

Riko Oki - One of the best experts on this subject based on the ideXlab platform.

  • calibration of the dual frequency Precipitation radar onboard the global Precipitation Measurement core observatory
    2020
    Co-Authors: Takeshi Masaki, K. Furukawa, Toshio Iguchi, Takuji Kubota, Kaya Kanemaru, Naofumi Yoshida, Riko Oki
    Abstract:

    This article describes four-year calibration results of the dual-frequency Precipitation radar (DPR) onboard the Global Precipitation Measurement (GPM) Core Observatory. The calibration method basically follows the method that was used to calibrate the Precipitation radar (PR) onboard the Tropical Rainfall Measuring Mission (TRMM) satellite. However, both the hardware and data processing method for calibration are improved by taking advantage of the lessons learned from the PR's calibration. Since the response of the radar receivers was found to depend on the waveform, the active calibrator was improved in such a way that the external calibration can be performed with both continuous and pulse waves. The methods for evaluating the calibration data were also improved. Instead of assuming a Gaussian antenna pattern, the effective beamwidths were determined by assuming an antenna pattern created by the Taylor distribution that was used to design the antennas. The results of the calibration including these improvements provide the new precise parameters of DPR's calibration. The new parameters increased the Ku-band Precipitation radar's (KuPR's) radar reflectivity factor (Z) by about 1.3 dB and that of the Ka-band Precipitation radar (KaPR) by about 1.2 dB from the precalibrated Z values, and the minimum detectable radar reflectivities were 15.46, 19.18, and 13.71 dBZ for KuPR, matched beam of KaPR, and high-sensitivity beam of KaPR, respectively. After applying the new calibration methods to both DPR and PR, normalized radar cross sections (σ₀) from the DPR and PR agree with each other.

  • drop size distribution observed by dual frequency Precipitation radar onboard global Precipitation Measurement core satellite
    2018
    Co-Authors: Atsushi Hamada, Yukari N Takayabu, Takuji Kubota, Moeka Yamaji, Hiroshi Takahashi, Riko Oki
    Abstract:

    This study investigated the drop size distribution (DSD) observed by the Dual-frequency Precipitation Radar (DPR) onboard the Global Precipitation Measurement (GPM) core satellite, which makes the world’s first dual-frequency preciptation observations by space-borne radar. Four years have passed since the launch of the GPM core satellite, and data have been accumulated. This study focuses on the characteristics of DSD derived from the GPM/DPR Measurements. In this study, DSD parameters (especially for a mass-weighted mean diameter, Dm) which are estimated based on dual-frequency information derived from GPM/DPR are analyzed with seasonal variations and Precipitation characteristics. Values of Dm are generally larger over land than over the oceans. DSD shows seasonal variation, especially over the mid-latitude ocean; Dm in the winter season over the mid-latitude ocean is larger than that in the summer season in both the Northern and Southern hemispheres. Focusing on the mid-latitude North Pacific Ocean close to Japan in winter, Precipitation top height is lower and stratiform ratio is higher than those in summer. It suggests that differences of Dm are associated with those of Precipitation regimes, such as organized Precipitation system in summer season and extratropical frontal systems in winter season.

  • prime mission results of the dual frequency Precipitation radar on the global Precipitation Measurement core spacecraft and the version 5 gpm standard products
    2017
    Co-Authors: K. Furukawa, Riko Oki, Takuji Kubota, Tomomi Nio, Toshio Iguchi
    Abstract:

    The Dual-frequency Precipitation Radar (DPR) on the Global Precipitation Measurement (GPM) core satellite was developed by Japan Aerospace Exploration Agency (JAXA) and National Institute of Information and Communications Technology (NICT). The objective of the GPM mission is to observe global Precipitation more frequently and accurately. The GPM core satellite is a joint product of National Aeronautics and Space Administration (NASA), JAXA and NICT. NASA developed the satellite bus and the GPM Microwave Imager (GMI), and JAXA and NICT developed the DPR. The inclination of the GPM core satellite is 65 degrees, and the nominal flight altitude is 407 km. The non-sunsynchronous circular orbit is necessary for measuring the diurnal change of rainfall. The DPR consists of two radars, which are Ku-band Precipitation radar (KuPR) and Ka-band Precipitation radar (KaPR). GPM core observatory was successfully launched by H2A launch vehicle on Feb. 28, 2014. DPR orbital check out was completed in May 2014. DPR products were released to the public on Sep. 2, 2014 and Normal Observation Operation period was started. JAXA is continuing DPR trend monitoring, calibration and validation operations to confirm that DPR keeps its function and performance on orbit. The results of DPR trend monitoring, calibration and validation show that DPR kept its function and performance on orbit during the 3 years and 2 months prime mission period. The DPR Prime mission period was completed in May 2017. The version 5 GPM products were released to the public in 2017. JAXA confirmed that GPM/DPR total system performance and the GPM version 5 products achieved the success criteria and the performance indicators that were defined for the JAXA GPM/DPR mission.

  • the global Precipitation Measurement mission
    2014
    Co-Authors: Arthur Y Hou, M Kojima, Christian D Kummerow, Kenji Nakamura, Ramesh K Kakar, Steven P Neeck, Ardeshir A Azarbarzin, Riko Oki, Toshio Iguchi
    Abstract:

    Precipitation affects many aspects of our everyday life. It is the primary source of freshwater and has significant socioeconomic impacts resulting from natural hazards such as hurricanes, floods, droughts, and landslides. Fundamentally, Precipitation is a critical component of the global water and energy cycle that governs the weather, climate, and ecological systems. Accurate and timely knowledge of when, where, and how much it rains or snows is essential for understanding how the Earth system functions and for improving the prediction of weather, climate, freshwater resources, and natural hazard events. The Global Precipitation Measurement (GPM) mission is an international satellite mission specifically designed to set a new standard for the Measurement of Precipitation from space and to provide a new generation of global rainfall and snowfall observations in all parts of the world every 3 h. The National Aeronautics and Space Administration (NASA) and the Japan Aerospace and Exploration Agency (JAXA) ...

  • development of spaceborne dual frequency Precipitation radar for the global Precipitation Measurement
    2004
    Co-Authors: S Satoh, K. Furukawa, M Kojima, Toshio Iguchi, Hiroshi Hanado, Nobuhiro Takahashi, Riko Oki, Yumi Senbokuya, Shuji Shimizu, Minoru Okumura
    Abstract:

    The Dual-frequency Precipitation Radar (DPR) that will be installed on the Global Precipitation Measurement (GPM) core satellite is being developed. The DPR consists of Ku-band (13.6 GHz) Precipitation radar (KuPR) and Ka-band (35.5 GHz) Precipitation radar (KaPR). The objectives of the DPR are to provide three-dimensional Precipitation (rainfall and snowfall) structure over both ocean and land, and to improve the sensitivity and accuracy of the Precipitation Measurement. Both KuPR and KaPR have almost the same design as TRMM PR, which includes 128-element phased array antenna, SSPA, LNA, PHS, and so on. The minimum detectable rainfall rate will be improved to 0.2 mm/hr by KaPR. Accurate rainfall estimates will be provided by a dual-frequency algorithm using the matched beam data observed by KuPR and KaPR.

K. Furukawa - One of the best experts on this subject based on the ideXlab platform.

  • calibration of the dual frequency Precipitation radar onboard the global Precipitation Measurement core observatory
    2020
    Co-Authors: Takeshi Masaki, K. Furukawa, Toshio Iguchi, Takuji Kubota, Kaya Kanemaru, Naofumi Yoshida, Riko Oki
    Abstract:

    This article describes four-year calibration results of the dual-frequency Precipitation radar (DPR) onboard the Global Precipitation Measurement (GPM) Core Observatory. The calibration method basically follows the method that was used to calibrate the Precipitation radar (PR) onboard the Tropical Rainfall Measuring Mission (TRMM) satellite. However, both the hardware and data processing method for calibration are improved by taking advantage of the lessons learned from the PR's calibration. Since the response of the radar receivers was found to depend on the waveform, the active calibrator was improved in such a way that the external calibration can be performed with both continuous and pulse waves. The methods for evaluating the calibration data were also improved. Instead of assuming a Gaussian antenna pattern, the effective beamwidths were determined by assuming an antenna pattern created by the Taylor distribution that was used to design the antennas. The results of the calibration including these improvements provide the new precise parameters of DPR's calibration. The new parameters increased the Ku-band Precipitation radar's (KuPR's) radar reflectivity factor (Z) by about 1.3 dB and that of the Ka-band Precipitation radar (KaPR) by about 1.2 dB from the precalibrated Z values, and the minimum detectable radar reflectivities were 15.46, 19.18, and 13.71 dBZ for KuPR, matched beam of KaPR, and high-sensitivity beam of KaPR, respectively. After applying the new calibration methods to both DPR and PR, normalized radar cross sections (σ₀) from the DPR and PR agree with each other.

  • prime mission results of the dual frequency Precipitation radar on the global Precipitation Measurement core spacecraft and the version 5 gpm standard products
    2017
    Co-Authors: K. Furukawa, Takuji Kubota, Toshio Iguchi
    Abstract:

    The Dual-frequency Precipitation Radar (DPR) on the Global Precipitation Measurement (GPM) core satellite was developed by Japan Aerospace Exploration Agency (JAXA) and National Institute of Information and Communications Technology (NICT). The objective of the GPM mission is to observe global Precipitation more frequently and accurately. The GPM core satellite is a joint product of National Aeronautics and Space Administration (NASA), JAXA and NICT. NASA developed the satellite bus and the GPM Microwave Imager (GMI), and JAXA and NICT developed the DPR. The inclination of the GPM core satellite is 65 degrees, and the nominal flight altitude is 407 km. The non-sunsynchronous circular orbit is necessary for measuring the diurnal change of rainfall. The DPR consists of two radars, which are Ku-band Precipitation radar (KuPR) and Ka-band Precipitation radar (KaPR). GPM core observatory was successfully launched by H2A launch vehicle on Feb. 28, 2014. DPR orbital check out was completed in May 2014. DPR products were released to the public on Sep. 2, 2014 and Normal Observation Operation period was started. JAXA is continuing DPR trend monitoring, calibration and validation operations to confirm that DPR keeps its function and performance on orbit. The results of DPR trend monitoring, calibration and validation show that DPR kept its function and performance on orbit during the 3 years and 2 months prime mission period. The DPR Prime mission period was completed in May 2017. The version 5 GPM products were released to the public in 2017. JAXA confirmed that GPM/DPR total system performance and the GPM version 5 products achieved the success criteria and the performance indicators that were defined for the JAXA GPM/DPR mission.

  • prime mission results of the dual frequency Precipitation radar on the global Precipitation Measurement core spacecraft and the version 5 gpm standard products
    2017
    Co-Authors: K. Furukawa, Riko Oki, Takuji Kubota, Tomomi Nio, Toshio Iguchi
    Abstract:

    The Dual-frequency Precipitation Radar (DPR) on the Global Precipitation Measurement (GPM) core satellite was developed by Japan Aerospace Exploration Agency (JAXA) and National Institute of Information and Communications Technology (NICT). The objective of the GPM mission is to observe global Precipitation more frequently and accurately. The GPM core satellite is a joint product of National Aeronautics and Space Administration (NASA), JAXA and NICT. NASA developed the satellite bus and the GPM Microwave Imager (GMI), and JAXA and NICT developed the DPR. The inclination of the GPM core satellite is 65 degrees, and the nominal flight altitude is 407 km. The non-sunsynchronous circular orbit is necessary for measuring the diurnal change of rainfall. The DPR consists of two radars, which are Ku-band Precipitation radar (KuPR) and Ka-band Precipitation radar (KaPR). GPM core observatory was successfully launched by H2A launch vehicle on Feb. 28, 2014. DPR orbital check out was completed in May 2014. DPR products were released to the public on Sep. 2, 2014 and Normal Observation Operation period was started. JAXA is continuing DPR trend monitoring, calibration and validation operations to confirm that DPR keeps its function and performance on orbit. The results of DPR trend monitoring, calibration and validation show that DPR kept its function and performance on orbit during the 3 years and 2 months prime mission period. The DPR Prime mission period was completed in May 2017. The version 5 GPM products were released to the public in 2017. JAXA confirmed that GPM/DPR total system performance and the GPM version 5 products achieved the success criteria and the performance indicators that were defined for the JAXA GPM/DPR mission.

  • the orbital operations status of the dual frequency Precipitation radar on the global Precipitation Measurement core spacecraft
    2015
    Co-Authors: K. Furukawa, M Kojima, Toshio Iguchi, Hiroshi Hanado, Toshiyuki Konishi, Takeshi Masaki, Takuji Kubota, Yuki Kaneko, Misako Kachi, K Nakagawa
    Abstract:

    The Dual-frequency Precipitation Radar (DPR) installed on the Global Precipitation Measurement (GPM) core satellite was developed by JAXA and NICT. This paper describes mission objectives, technical performance, resource allocation, ground test results, orbital check out results and orbital operation status of the DPR. The DPR system PFT has completed in February 2012. GPM core spacecraft satellite system test has completed at NASA Goddard Space Flight Center 2013. GPM core observatory was shipped to JAXA Tanegashima Space Center, JAPAN and GPM core observatory was successfully launched by H-IIA launch vehicle on Feb 28, 2014. DPR orbital check out was completed in May 2014. DPR products released to the public on Sep. 2, 2014 and Normal Observation Operation period was started. The orbital operations status of DPR is reported in this paper.

  • the orbital checkout status of the dual frequency Precipitation radar on the global Precipitation Measurement core spacecraft
    2014
    Co-Authors: K. Furukawa, T. Miura, M Kojima, K Nakagawa, Yasutoshi Hyakusoku, Takayuki Ishikiri, Toshio Iguchi, Hiroshi Hanado, Hiroki Kai, Minoru Okumura
    Abstract:

    The Dual-frequency Precipitation Radar (DPR) installed on the Global Precipitation Measurement (GPM) core satellite was developed by JAXA and NICT. This paper describes mission objectives, technical performance, resource allocation, design, proto-flight test (PFT) of the DPR instrument, satellite system test including launch operations and orbital check out results of the DPR. The DPR system PFT has completed in February 2012. DPR has handed over to NASA and integration of the DPR to the GPM core spacecraft have completed in May 2012. GPM core spacecraft satellite system test has completed at NASA Goddard Space Flight Center. GPM core observatory was shipped to JAXA Tanegashima Space Center, JAPAN and Launch Site Operations has completed. GPM core observatory was successfully launched by H-IIA launch vehicle on Feb 28, 2014. DPR orbital check out had started in March 2014 and it was completed in May 2014. The orbital check out results of DPR is reported in this paper.

Walter A Petersen - One of the best experts on this subject based on the ideXlab platform.

  • development and evaluation of the raindrop size distribution parameters for the nasa global Precipitation Measurement mission ground validation program
    2020
    Co-Authors: Ali Tokay, David B Wolff, Leo Pio Dadderio, Walter A Petersen
    Abstract:

    AbstractThe National Aeronautics and Space Administration Global Precipitation Measurement (GPM) mission ground validation program uses dual-polarization radar moments to estimate raindrop size dis...

  • the global Precipitation Measurement gpm mission s scientific achievements and societal contributions reviewing four years of advanced rain and snow observations
    2018
    Co-Authors: Gail Skofronickjackson, George J. Huffman, Walter A Petersen, Chris Kidd, Dalia Kirschbaum, Erich Franz Stocker, Ramesh K Kakar
    Abstract:

    Precipitation represents a life-critical energy and hydrologic exchange between the Earth’s atmosphere and its surface. As such, knowledge of where, when, and how much rain and snow falls is essential for scientific research and societal applications. Building on the 17-year success of the Tropical Rainfall Measurement Mission (TRMM), the Global Precipitation Measurement (GPM) Core Observatory (GPM-CO) is the first U.S. National Aeronautical and Space Administration (NASA) satellite mission specifically designed with sensors to observe the structure and intensities of both rain and falling snow. The GPM-CO has proved to be a worthy successor to TRMM, extending and improving high-quality active and passive microwave observations across all times of day. The GPM-CO launched in early 2014, is a joint mission between NASA and the Japanese Aerospace Exploration Agency (JAXA), with sensors that include the NASA-provided GPM Microwave Imager and the JAXA-provided Dual-frequency Precipitation Radar. These sensors were devised with high accuracy standards enabling them to be used as a reference for inter-calibrating a constellation of partner satellite data. These intercalibrated partner satellite retrievals are used with infrared data to produce merged Precipitation estimates at temporal scales of 30 minutes and spatial scales of 0.1° x 0.1°. Precipitation estimates from the GPM-CO and partner constellation satellites, provided in near real time and later reprocessed with all ancillary data, are an indispensable source of Precipitation data for operational and scientific users. Advances have been made using GPM data, primarily in improving sensor calibration, retrieval algorithms, and ground validation Measurements, and used to further our understanding of the characteristics of liquid and frozen Precipitation and the science of water and hydrological cycles for climate/weather forecasting. These advances have extended to societal benefits related to water resources, operational numerical weather prediction, hurricane monitoring, prediction, and disaster response, extremes, and disease.

  • evaluation of global Precipitation Measurement rainfall estimates against three dense gauge networks
    2018
    Co-Authors: Jackson Tan, Walter A Petersen, Gottfried Kirchengast, David C Goodrich, David B Wolff
    Abstract:

    AbstractPrecipitation profiles from the Global Precipitation Measurement (GPM) Core Observatory Dual-Frequency Precipitation Radar (DPR; Ku and Ka bands) form part of the a priori database used in ...

  • global Precipitation Measurement gpm unified Precipitation estimation from space
    2018
    Co-Authors: Gail Skofronickjackson, George J. Huffman, Walter A Petersen, Wesley Berg, Christopher Kidd, Dalia Kirschbaum, Yukari N Takayabu
    Abstract:

    Global Precipitation Measurement (GPM) is an international satellite mission that uses Measurements from an advanced radar/radiometer system on a Core Observatory as reference standards to unify and advance Precipitation estimates through a constellation of research and operational microwave sensors. GPM is a science mission focusing on a key component of the Earth’s water and energy cycle, delivering near real-time observations of Precipitation for monitoring severe weather events, freshwater resources, and other societal applications. This work presents the GPM mission design, together with descriptions of sensor characteristics, inter-satellite calibration, retrieval methodologies, ground validation activities, and societal applications.

  • the global Precipitation Measurement gpm mission for science and society
    2017
    Co-Authors: Gail Skofronickjackson, George J. Huffman, Walter A Petersen, Chris Kidd, Ramesh K Kakar, Wesley Berg, Dalia Kirschbaum, Erich Franz Stocker, Scott A Braun, Toshio Iguchi
    Abstract:

    AbstractPrecipitation is a key source of freshwater; therefore, observing global patterns of Precipitation and its intensity is important for science, society, and understanding our planet in a changing climate. In 2014, the National Aeronautics and Space Administration (NASA) and the Japan Aerospace Exploration Agency (JAXA) launched the Global Precipitation Measurement (GPM) Core Observatory (CO) spacecraft. The GPM CO carries the most advanced Precipitation sensors currently in space including a dual-frequency Precipitation radar provided by JAXA for measuring the three-dimensional structures of Precipitation and a well-calibrated, multifrequency passive microwave radiometer that provides wide-swath Precipitation data. The GPM CO was designed to measure rain rates from 0.2 to 110.0 mm h−1 and to detect moderate to intense snow events. The GPM CO serves as a reference for unifying the data from a constellation of partner satellites to provide next-generation, merged Precipitation estimates globally and ...