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Masanobu Shimada - One of the best experts on this subject based on the ideXlab platform.
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status of the advanced land observing satellite 2 ALOS 2 and its follow on l band sar mission
International Geoscience and Remote Sensing Symposium, 2017Co-Authors: Takeshi Motohka, Yukihiro Kankaku, Shinichi Suzuki, Masanobu ShimadaAbstract:This paper introduces the operational status of the Advanced Land Observing Satellite-2 (ALOS-2) and its follow-on L-band SAR mission in Japan. ALOS-2 observes the earth surface with the Phased Array type L-band Synthetic Aperture Radar-2 (PALSAR-2) that is effectively used for many applications such as land deformation mapping and forest change mapping. To keep and enhance the applications using PALSAR-2 data, JAXA plans to launch a successor satellite to the ALOS-2 in Japanese Fiscal Year 2020. The concepts of the ALOS-2 follow-on are expanding swath width and increasing observation frequency while keeping high spatial resolution of the PALSAR-2 for improving the response of disaster monitoring, early detection of anomalies on the earth surface, and enabling time-series interferometric SAR (INSAR) analysis.
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ALOS 2 operation status
International Geoscience and Remote Sensing Symposium, 2016Co-Authors: Yukihiro Kankaku, Shinichi Suzuki, Takeshi Motohka, Masato Ohki, Ryo Natsuaki, Masanobu ShimadaAbstract:The Advanced Land Observing Satellite-2 (ALOS-2) was successfully launched on 24th May, 2014. The mission sensor of ALOS-2 is the Phased Array type L-band Synthetic Aperture Radar-2 called PALSAR-2 which is the state of the art L-band SAR system. At After launch, the initial checkout and the calibration and validation phase had been completed, and the PALSAR-2 standard products were released via web site at the end of November 2015. Until now, ALOS-2 has had contributed to a lot of emergency observations for disasters such as earthquakes flood, land slide which were impacted by typhoons, and volcano eruptions, not only in Japan but also in the world. Furthermore, based on the Basic Observation Scenario (BOS) of ALOS-2, base map data are collected and archived for the interferometry SAR processing in Japan area as well as global world. This document describes the results of ALOS-2 operation in routine operation phase.
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IGARSS - ALOS-2 operation status
2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2016Co-Authors: Yukihiro Kankaku, Shinichi Suzuki, Takeshi Motohka, Masato Ohki, Ryo Natsuaki, Masanobu ShimadaAbstract:The Advanced Land Observing Satellite-2 (ALOS-2) was successfully launched on 24th May, 2014. The mission sensor of ALOS-2 is the Phased Array type L-band Synthetic Aperture Radar-2 called PALSAR-2 which is the state of the art L-band SAR system. At After launch, the initial checkout and the calibration and validation phase had been completed, and the PALSAR-2 standard products were released via web site at the end of November 2015. Until now, ALOS-2 has had contributed to a lot of emergency observations for disasters such as earthquakes flood, land slide which were impacted by typhoons, and volcano eruptions, not only in Japan but also in the world. Furthermore, based on the Basic Observation Scenario (BOS) of ALOS-2, base map data are collected and archived for the interferometry SAR processing in Japan area as well as global world. This document describes the results of ALOS-2 operation in routine operation phase.
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ALOS-2 initial results
Sensors Systems and Next-Generation Satellites XIX, 2015Co-Authors: Yukihiro Kankaku, Shinichi Suzuki, Masanobu ShimadaAbstract:The Advanced Land Observing Satellite-2 (ALOS-2) was launched from Tanegashima Space Center by H-IIA rocket successfully on 24th May 2014. ALOS-2 carries the Phased Array type L-band Synthetic Aperture Radar-2 (PALSAR-2) as the state-of-the-art L-band SAR system which succeeds to PALSAR onboard ALOS. PALSAR-2 uses almost whole bandwidth allocated for L-band active sensor of Earth Exploration Satellites Service specified by the Radio Regulation in order to realize the high resolution observation, and also, it transmits more than 6 kW power for lower Noise Equivalent Sigma Zero using 180 TRMs driven by Gallium Nitride (GaN) amplifier which is the first use in space. Furthermore, because ALOS-2 carries the SAR system only, PALSAR-2 antenna can be mounted under the satellite body. It enables to observe right-/left-looking observation by satellite maneuvering. And the high accuracy orbit control to maintain the satellite within 500 m radius tube against the reference orbit enables high coherence for the InSAR processing. Using these new technologies, ALOS-2 has been operating to fulfill the mission requirements such as disaster monitoring and so on. This document introduces the initial result of ALOS-2 from the first year operation.
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ALOS 2 first year operation result
International Geoscience and Remote Sensing Symposium, 2015Co-Authors: Yukihiro Kankaku, Shinichi Suzuki, Masanobu ShimadaAbstract:The Advanced Land Observing Satellite-2 (ALOS-2) was launched from Tanegashima Space Center by H-IIA rocket successfully on 24th May 2014. The Phased Array type L-band Synthetic Aperture Radar-2 (PALSAR-2) is the state-of-the-art L-band SAR system which succeeds to PALSAR onboard ALOS. PALSAR-2 uses almost whole bandwidth allocated for L-band active sensor of Earth Exploration Satellites Service specified by the Radio Regulation in order to realize the high resolution observation, and also, PALSAR-2 transmits more than 6 kW power using 180 TRMs driven by Gallium Nitride (GaN) amplifier which is the first use for satellite in order to realize the lower Noise Equivalent Sigma Zero. Furthermore, because ALOS-2 carries PALSAR-2 only, PALSAR-2 antenna can be mounted under the satellite body. It enables to observe right-/left-looking observation by satellite maneuvering. And the high accuracy orbit control which maintains within 500 m radius tube for the reference orbit enables high coherence for the InSAR processing. Using these new technologies, ALOS-2 has been operating to fulfill the mission requirements such as disaster monitoring and so on. At this moment, one year has passed since the launch. This document introduces the first year operation result of ALOS-2.
Takeo Tadono - One of the best experts on this subject based on the ideXlab platform.
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CALIBRATION AND VALIDATION OF THE ADVANCED LAND OBSERVING SATELLITE-3 “ALOS-3”
ISPRS - International Archives of the Photogrammetry Remote Sensing and Spatial Information Sciences, 2020Co-Authors: Takeo Tadono, Yousei Mizukami, Hidenori Watarai, Junichi Takaku, F. Ohgushi, H. KaiAbstract:Abstract. The “Advanced Land Observing Satellite-3” (ALOS-3, nicknamed “DAICHI-3”) is the next high-resolution optical mission as a successor of the optical mission by the Advanced Land Observing Satellite (ALOS, “DAICHI”) in Japan Aerospace Exploration Agency (JAXA), and will be launched in Japanese Fiscal Year 2020. ALOS-3 is now under developing the flight model. The major missions of ALOS-3 are (1) to contribute safe and secure social including provision for natural disasters, and (2) to create and update geospatial information in land and coastal areas. To achieve the missions, the “WIde-Swath and High-resolution optical imager” (WISH, as a tentative name) is mounted on ALOS-3, which consists of the high-resolution panchromatic- and multispectral-bands. This paper introduces the overview of ALOS-3’s mission and the calibration and validation plan at JAXA. The standard product is the system corrected data using the sensor models, which will be provided from the sensor development team. Therefore, the sensor calibration is directly affected to the accuracies of the standard product. In addition, the sensor model based the Rational Polynomial Coefficient will be contained with level 1B2 standard product that can be used to process an ortho rectification and three-dimensional measurement from ALOS-3 images. As the target accuracy of WISH’s standard products, the geometric accuracies are less than 5 m in horizontal without ground control point (GCP), and 1.25 m in horizontal and 2.5 m in vertical with GCPs (1 sigma), and the radiometric accuracy is ± 10 % as absolutely and ± 5 % as relatively for multispectral band.
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IGARSS - Mission Overview of the Advanced Optical Satellite (ALOS-3)
IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019Co-Authors: Takeo Tadono, Yousei Mizukami, Ayano Oka, Hidenori Watarai, Masakazu SagisakaAbstract:The "Advanced Optical Satellite" (nicknamed "ALOS-3") is the next high-resolution optical mission as a successor of the Advanced Land Observing Satellite (ALOS) in Japan Aerospace Exploration Agency (JAXA), and now conducting the Critical Design Review (CDR) phase. The mission objecttives of ALOS-3 are (1) to contribute safe and secure social including provisions for natural disasters, and (2) to create and update geo-spatial information. The "wide-swath and high-resolution optical imager" is designed to be achieved the missions, which consists of the panchromatic band with 0.8 m ground sampling distance (GSD) and multi-spectral six bands with 3.2 m GSD, and the observation swath width is 70 km at nadir. In this study, mission overview, and planned- and expected-products of ALOS-3 are introduced.
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Operational performance of the ALOS global systematic acquisition strategy and observation plans for ALOS-2 PALSAR-2
Remote Sensing of Environment, 2014Co-Authors: Ake Rosenqvist, Takeo Tadono, Shinichi Suzuki, Masanobu Shimada, Fumi Ohgushi, Manabu Watanabe, Kaoru Tsuzuku, Tomozo Watanabe, S. Kamijo, Emi AokiAbstract:Abstract With the launch of the Advanced Land Observing Satellite (ALOS) in 2006, the Japanese Space Agency (JAXA) took the initiative to implement the first global-scale systematic acquisition strategy for satellite sensors at fine and medium (2.5–20 m) spatial resolution. Comprising all three sensors on ALOS (PALSAR, PRISM, AVNIR-2), the plan was designed to serve all ALOS user categories and aimed at producing spatially and temporally consistent baseline coverages over the planet on a repetitive basis, to accommodate systematic global-scale, fine-resolution, monitoring of the environment. Unlike the common background missions defined for most fine-resolution Earth Observation satellites, the observation strategy was implemented as a top-level foreground mission with a priority second only to that of special observation requests and emergency observations and sensor calibration. While the ALOS mission regrettably ended in April 2011, the global acquisition strategy nevertheless produced a comprehensive and homogeneous global archive in which consistent time-series of data are available for any arbitrary land area on Earth (excluding Antarctica > 77.5° South latitude, which could not be reached by the sensors). Clouds and haze inevitably constituted limitations for the optical sensors, while for the PALSAR instrument, two cloud-free and near-gap free (~ 95%) global coverages were achieved annually during the 4.5 years in operations. Previously, such uniform data archives existed only for coarse-resolution sensors such as AVHRR, MERIS and MODIS. The ALOS BOS supported a variety applications from local to global scales, ranging from structural deformation, monitoring of wetlands regional inundation patterns and mapping of forest extent and changes over nations and continents at spatial resolutions as fine as 10 m. The Advanced Land Observing Satellite 2 (ALOS-2) was launched on May 24, 2014. Equipped with an enhanced L-band SAR sensor (PALSAR-2), ALOS-2 resumes the global wall-to-wall acquisitions to assure continuity and consistency with JAXA’s global mission objectives and unique L-band SAR archive created by ALOS PALSAR.
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A conceptual design of PRISM-2 for Advanced Land Observing Satellite-3 (ALOS-3)
Sensors Systems and Next-Generation Satellites XVI, 2012Co-Authors: Hiroko Imai, Masakazu Sagisaka, Shinichi Suzuki, Yuji Osawa, Haruyoshi Katayama, Yasushi Hatooka, Masuo Takahashi, Takeo TadonoAbstract:The Japan Aerospace Exploration Agency (JAXA) is planning a satellite system including Advanced Land Observing Satellites 2 and 3 (ALOS-2 and ALOS-3) for the ALOS follow-on program. ALOS-3 will carry the optical sensor named “PRISM-2” and extend the capabilities of earlier ALOS missions. PRISM-2 will be able to collect high-resolution (0.8m) and wide-swath (50 km) imagery with high geo-location accuracy, as well as provide precise digital surface models (DSMs) using stereo pair images acquired by two telescopes. These capabilities are ideal for obtaining large-scale geographical information such as elevation and land cover-maps for use in many research areas and practical applications, including disaster management support. JAXA has conducted a phase A study of the ALOS-3 spacecraft and PRISM-2, and is now working on prototype models of key components of PRISM-2’s telescope, focal plane, and data compressor. This paper introduces a conceptual design for PRISM-2 and the ALOS-3 system.
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advanced land observing satellite ALOS and monitoring global environmental change
Proceedings of the IEEE, 2010Co-Authors: Masanobu Shimada, Takeo Tadono, Ake RosenqvistAbstract:The Advanced Land Observing Satellite (ALOS) was developed for detailed observation of the Earth's surface and frequent monitoring of global environmental changes, using high-resolution optical (visible and near infrared push-broom) and active microwave sensors (L-band synthetic aperture radar). ALOS has four mission objectives: cartography, regional observations, disaster observations, and resource exploration. It has been operational since its launch in January 24, 2006, and is acquiring a large amount of land-surface data supported by the Ka-band intersatellite communication system that downlinks to ground receiving stations. A global systematic acquisition strategy is implemented for all three sensors to enable consistent data collection over all land areas on a repetitive basis. Through its three sensors, acquisition strategy, and communication infrastructure, the ALOS mission is aimed to contribute to monitoring water, carbon, and global climate change. In this paper, we describe ALOS and its contribution to global environmental monitoring.
Saturnino Marco Lupi - One of the best experts on this subject based on the ideXlab platform.
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autologous periosteum derived micrografts and plga ha enhance the bone formation in sinus lift augmentation
Frontiers in Cell and Developmental Biology, 2017Co-Authors: Ruggero Rodriguez Y Baena, Riccardo Daquino, Letizia Trovato, Gabriele Ceccarelli, Gabriella Cusella, Andre Antonio Pelegrine, Antonio Carlos Aloise, Antonio Graziano, Saturnino Marco LupiAbstract:Sinus lift augmentation is a procedure required for the placement of a dental implant, whose success can be limited by the quantity or quality of available bone. To this purpose, the first aim of the current study was to evaluate the ability of autologous periosteum-derived micrografts and Poly(lactic-co-glycolic acid) (PLGA) supplemented with hydroxyl apatite (HA) to induce bone augmentation in the sinus lift procedure. Secondly, we compared the micrograft’s behavior with respect to biomaterial alone, including Bio-Oss® and PLGA/HA, commercially named ALOS. Sinus lift procedure was performed on 24 patients who required dental implants and who, according to the study design and procedure performed, were divided into three groups: group A (ALOS + periosteum-derived micrografts); group B (ALOS alone); and group C (Bio-Oss® alone). Briefly, in group A, a small piece of periosteum was collected from each patient and mechanically disaggregated by Rigenera® protocol using the Rigeneracons medical device. This protocol allowed for the obtainment of autologous micrografts, which in turn were used to soak the ALOS scaffold. At six months after the sinus lift procedure and before the installation of dental implants, histological and radiographic evaluations in all three groups were performed. In group A, where sinus lift augmentation was performed using periosteum-derived micrografts and ALOS, the bone regeneration was much faster than in the control groups where it was performed with ALOS or Bio-Oss® alone (groups B and C, respectively). In addition, the radiographic evaluation in the patients of group A showed a radio-opacity after four months, while after six months, the prosthetic rehabilitation was improved and was maintained after two years post-surgery. In summary, we report on the efficacy of periosteum-derived micrografts and ALOS to augment sinus lift in patients requiring dental implants. This efficacy is supported by an increased percentage of vital mineralized tisssue in the group treated with both periosteum-derived micrografts and ALOS, with respect to the control group of ALOS or Bio-Oss® alone, as confirmed by histological analysis and radiographic evaluations at six months from treatment.
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Autologous Periosteum-Derived Micrografts and PLGA/HA Enhance the Bone Formation in Sinus Lift Augmentation.
Frontiers in Cell and Developmental Biology, 2017Co-Authors: Ruggero Rodriguez Y Baena, Letizia Trovato, Gabriele Ceccarelli, Gabriella Cusella, Andre Antonio Pelegrine, Riccardo D'aquino, Antonio Carlos Aloise, Antonio Graziano, Saturnino Marco LupiAbstract:Sinus lift augmentation is a procedure required for the placement of a dental implant, whose success can be limited by the quantity or quality of available bone. To this purpose, the first aim of the current study was to evaluate the ability of autologous periosteum-derived micrografts and Poly(lactic-co-glycolic acid) (PLGA) supplemented with hydroxyl apatite (HA) to induce bone augmentation in the sinus lift procedure. Secondly, we compared the micrograft’s behavior with respect to biomaterial alone, including Bio-Oss® and PLGA/HA, commercially named ALOS. Sinus lift procedure was performed on 24 patients who required dental implants and who, according to the study design and procedure performed, were divided into three groups: group A (ALOS + periosteum-derived micrografts); group B (ALOS alone); and group C (Bio-Oss® alone). Briefly, in group A, a small piece of periosteum was collected from each patient and mechanically disaggregated by Rigenera® protocol using the Rigeneracons medical device. This protocol allowed for the obtainment of autologous micrografts, which in turn were used to soak the ALOS scaffold. At six months after the sinus lift procedure and before the installation of dental implants, histological and radiographic evaluations in all three groups were performed. In group A, where sinus lift augmentation was performed using periosteum-derived micrografts and ALOS, the bone regeneration was much faster than in the control groups where it was performed with ALOS or Bio-Oss® alone (groups B and C, respectively). In addition, the radiographic evaluation in the patients of group A showed a radio-opacity after four months, while after six months, the prosthetic rehabilitation was improved and was maintained after two years post-surgery. In summary, we report on the efficacy of periosteum-derived micrografts and ALOS to augment sinus lift in patients requiring dental implants. This efficacy is supported by an increased percentage of vital mineralized tisssue in the group treated with both periosteum-derived micrografts and ALOS, with respect to the control group of ALOS or Bio-Oss® alone, as confirmed by histological analysis and radiographic evaluations at six months from treatment.
Shinichi Suzuki - One of the best experts on this subject based on the ideXlab platform.
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IGARSS - ALOS-4 L-Band SAR Observation Concept and Development Status
IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium, 2020Co-Authors: Takeshi Motohka, Yukihiro Kankaku, Satoko Miura, Shinichi SuzukiAbstract:Japan Aerospace Exploration Agency (JAXA) is currently developing the ALOS-2 follow-on L-band Synthetic Aperture Radar (SAR) mission, namely Advanced Land Observing Satellite-4 (ALOS-4). ALOS-4 aims to enhance the use of ALOS-2, such as improving disaster risk detection capability, by increasing swath width and temporal resolution with new technologies. JAXA is currently developing a flight model and is also considering ALOS-4 observation plan for the launch in JFY2021. In this presentation, we will report the outline of ALOS-4 L-band SAR observation, the observation plan, and the latest development status.
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status of the advanced land observing satellite 2 ALOS 2 and its follow on l band sar mission
International Geoscience and Remote Sensing Symposium, 2017Co-Authors: Takeshi Motohka, Yukihiro Kankaku, Shinichi Suzuki, Masanobu ShimadaAbstract:This paper introduces the operational status of the Advanced Land Observing Satellite-2 (ALOS-2) and its follow-on L-band SAR mission in Japan. ALOS-2 observes the earth surface with the Phased Array type L-band Synthetic Aperture Radar-2 (PALSAR-2) that is effectively used for many applications such as land deformation mapping and forest change mapping. To keep and enhance the applications using PALSAR-2 data, JAXA plans to launch a successor satellite to the ALOS-2 in Japanese Fiscal Year 2020. The concepts of the ALOS-2 follow-on are expanding swath width and increasing observation frequency while keeping high spatial resolution of the PALSAR-2 for improving the response of disaster monitoring, early detection of anomalies on the earth surface, and enabling time-series interferometric SAR (INSAR) analysis.
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ALOS 2 operation status
International Geoscience and Remote Sensing Symposium, 2016Co-Authors: Yukihiro Kankaku, Shinichi Suzuki, Takeshi Motohka, Masato Ohki, Ryo Natsuaki, Masanobu ShimadaAbstract:The Advanced Land Observing Satellite-2 (ALOS-2) was successfully launched on 24th May, 2014. The mission sensor of ALOS-2 is the Phased Array type L-band Synthetic Aperture Radar-2 called PALSAR-2 which is the state of the art L-band SAR system. At After launch, the initial checkout and the calibration and validation phase had been completed, and the PALSAR-2 standard products were released via web site at the end of November 2015. Until now, ALOS-2 has had contributed to a lot of emergency observations for disasters such as earthquakes flood, land slide which were impacted by typhoons, and volcano eruptions, not only in Japan but also in the world. Furthermore, based on the Basic Observation Scenario (BOS) of ALOS-2, base map data are collected and archived for the interferometry SAR processing in Japan area as well as global world. This document describes the results of ALOS-2 operation in routine operation phase.
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IGARSS - ALOS-2 operation status
2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2016Co-Authors: Yukihiro Kankaku, Shinichi Suzuki, Takeshi Motohka, Masato Ohki, Ryo Natsuaki, Masanobu ShimadaAbstract:The Advanced Land Observing Satellite-2 (ALOS-2) was successfully launched on 24th May, 2014. The mission sensor of ALOS-2 is the Phased Array type L-band Synthetic Aperture Radar-2 called PALSAR-2 which is the state of the art L-band SAR system. At After launch, the initial checkout and the calibration and validation phase had been completed, and the PALSAR-2 standard products were released via web site at the end of November 2015. Until now, ALOS-2 has had contributed to a lot of emergency observations for disasters such as earthquakes flood, land slide which were impacted by typhoons, and volcano eruptions, not only in Japan but also in the world. Furthermore, based on the Basic Observation Scenario (BOS) of ALOS-2, base map data are collected and archived for the interferometry SAR processing in Japan area as well as global world. This document describes the results of ALOS-2 operation in routine operation phase.
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ALOS-2 initial results
Sensors Systems and Next-Generation Satellites XIX, 2015Co-Authors: Yukihiro Kankaku, Shinichi Suzuki, Masanobu ShimadaAbstract:The Advanced Land Observing Satellite-2 (ALOS-2) was launched from Tanegashima Space Center by H-IIA rocket successfully on 24th May 2014. ALOS-2 carries the Phased Array type L-band Synthetic Aperture Radar-2 (PALSAR-2) as the state-of-the-art L-band SAR system which succeeds to PALSAR onboard ALOS. PALSAR-2 uses almost whole bandwidth allocated for L-band active sensor of Earth Exploration Satellites Service specified by the Radio Regulation in order to realize the high resolution observation, and also, it transmits more than 6 kW power for lower Noise Equivalent Sigma Zero using 180 TRMs driven by Gallium Nitride (GaN) amplifier which is the first use in space. Furthermore, because ALOS-2 carries the SAR system only, PALSAR-2 antenna can be mounted under the satellite body. It enables to observe right-/left-looking observation by satellite maneuvering. And the high accuracy orbit control to maintain the satellite within 500 m radius tube against the reference orbit enables high coherence for the InSAR processing. Using these new technologies, ALOS-2 has been operating to fulfill the mission requirements such as disaster monitoring and so on. This document introduces the initial result of ALOS-2 from the first year operation.
Yuji Osawa - One of the best experts on this subject based on the ideXlab platform.
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ALOS-2 current status and operation plan
Sensors Systems and Next-Generation Satellites XVII, 2013Co-Authors: Shinichi Suzuki, Yukihiro Kankaku, Yuji OsawaAbstract:The Advanced Land Observing Satellite-2 (ALOS-2) carries the state-of-the-art L-band Synthetic Aperture Radar (SAR) called PALSAR-2 which succeeds to the ALOS / PALSAR. PALSAR-2 will have enhanced performance in both high resolution and wide swath compared to PALSAR. It will allow comprehensive monitoring of disasters. Wider bandwidth and shorter revisit time will give better conference for INSAR data analysis such as crustal deformation and deforestation. The Proto Flight Test (PFT) of ALOS-2 has been conducted since June 2012. In parallel, the PFT of PALSAR-2 has been conducted since March 2012. As of August 2013, ALOS-2 system has completed the interface test with ground system and is preparing for the Vibration test, Acoustic test and Electromagnetic Compatibility test. After completing these tests, ALOS-2 will be transported to JAXA Tanegashima Space Center for launch. The initial commissioning phase of ALOS-2 is planned for six months which are comprised of LEOP (Launch and Early Orbit Phase) and initial Cal/Val phase. During the LEOP, all components will be checked with direct downlink via Xband and with data relay communication via JAXA’s DRTS (Data Relay Test Satellite). During the initial Cal/Val phase, the PALSAR-2 data will be verified and calibrated by using Corner Reflectors and Geometric Calibrator at ground. The data acquisition during the commissioning phase will be consistent with the systematic acquisition strategy prepared for the routine operation. This paper describes the current status and operation plan of ALOS-2.
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ALOS 2 mission and development status
International Geoscience and Remote Sensing Symposium, 2013Co-Authors: Yukihiro Kankaku, Shinichi Suzuki, Yuji OsawaAbstract:JAXA is developing the Advanced Land Observing Satellite-2 (ALOS-2) carrying the state of the art L-band SAR named PALSAR-2. ALOS-2 mission is the follow-on of ALOS “Daichi” mission and PALSAR-2 succeeds to PALSAR onboard ALOS. PALSAR contributed to domestic and international disaster management activities by its interferometric application (InSAR). Compared to the PALSAR, higher spatial resolution, better NESZ (Noise Equivalent Sigma Zero) and better S/A (Signal to Ambiguity ratio) are required for PALSAR-2. In order to meet these requirements, JAXA introduced several improvements such as maximum bandwidth observation for PALSAR-2, spotlight mode with Active Phased Array Antenna, high power efficiency device, chirp modulation technique and dual receiving antenna system. In addition, very accurate orbit control and short repeat-pass orbit (14 days) will give higher coherence of interferometry.
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IGARSS - ALOS-2 mission and development status
2013 IEEE International Geoscience and Remote Sensing Symposium - IGARSS, 2013Co-Authors: Yukihiro Kankaku, Shinichi Suzuki, Yuji OsawaAbstract:JAXA is developing the Advanced Land Observing Satellite-2 (ALOS-2) carrying the state of the art L-band SAR named PALSAR-2. ALOS-2 mission is the follow-on of ALOS “Daichi” mission and PALSAR-2 succeeds to PALSAR onboard ALOS. PALSAR contributed to domestic and international disaster management activities by its interferometric application (InSAR). Compared to the PALSAR, higher spatial resolution, better NESZ (Noise Equivalent Sigma Zero) and better S/A (Signal to Ambiguity ratio) are required for PALSAR-2. In order to meet these requirements, JAXA introduced several improvements such as maximum bandwidth observation for PALSAR-2, spotlight mode with Active Phased Array Antenna, high power efficiency device, chirp modulation technique and dual receiving antenna system. In addition, very accurate orbit control and short repeat-pass orbit (14 days) will give higher coherence of interferometry.
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A conceptual design of PRISM-2 for Advanced Land Observing Satellite-3 (ALOS-3)
Sensors Systems and Next-Generation Satellites XVI, 2012Co-Authors: Hiroko Imai, Masakazu Sagisaka, Shinichi Suzuki, Yuji Osawa, Haruyoshi Katayama, Yasushi Hatooka, Masuo Takahashi, Takeo TadonoAbstract:The Japan Aerospace Exploration Agency (JAXA) is planning a satellite system including Advanced Land Observing Satellites 2 and 3 (ALOS-2 and ALOS-3) for the ALOS follow-on program. ALOS-3 will carry the optical sensor named “PRISM-2” and extend the capabilities of earlier ALOS missions. PRISM-2 will be able to collect high-resolution (0.8m) and wide-swath (50 km) imagery with high geo-location accuracy, as well as provide precise digital surface models (DSMs) using stereo pair images acquired by two telescopes. These capabilities are ideal for obtaining large-scale geographical information such as elevation and land cover-maps for use in many research areas and practical applications, including disaster management support. JAXA has conducted a phase A study of the ALOS-3 spacecraft and PRISM-2, and is now working on prototype models of key components of PRISM-2’s telescope, focal plane, and data compressor. This paper introduces a conceptual design for PRISM-2 and the ALOS-3 system.
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ALOS-2 development status and draft acquisition strategy
Sensors Systems and Next-Generation Satellites XVI, 2012Co-Authors: Shinichi Suzuki, Yukihiro Kankaku, Yuji OsawaAbstract:The Advanced Land Observing Satellite-2 (ALOS-2) will succeed to the radar mission of the ALOS “Daichi” which had contributed to cartography, regional observation, disaster monitoring, and earth resources surveys for more than 5 years until its termination of operation in May 2011. The state-of-the-art L-band Synthetic Aperture Radar (SAR) called PALSAR-2 onboard ALOS-2 will have enhanced performance in both high resolution (1m * 3m at finest in the Spotlight mode) and wide swath (up to 490km in the ScanSAR wide mode), compared to ALOS/PALSAR. Wider bandwidth and shorter revisit time will give better conference for INSAR data analysis such as crustal deformation and deforestation. The SAR antenna consists of 5 panels with total 1,080 radiation elements which are driven by 180 Transmit-Receive-Modules in order to steer and form a beam in both range and azimuth direction. In order to reduce range ambiguities,PALSAR-2 is capable to transmit up or down chirp signal alternatively and has phase modulation with zero or pi as well. The Proto Flight Model of ALOS-2 including PALSAR-2 is under integration and testing at JAXA’s Tsukuba Space Center. From experiences of the ALOS operation, a systematic observation strategy to achieve consistent data acquisitions in time and space was crucial. Since more observation modes of PALSAR-2 than those of PALSAR may trigger more conflicts among user requests, a basic observation scenario must be prepared to fulfill the mission requirements. This paper describes the current development status of ALOS-2 and a draft acquisition strategy for PALSAR-2.