Takeshi Motohka

ALOS-4: Design and Architecture of L-Band SAR for High-Resolution Wide-Swath Observations

Masataka Yajima, Masanobu Shibata, Shunsuke Ota, Shohei Nakamura et autres

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Development of Phased Array Type L-band Synthetic Aperture Radar-3 Antenna

Kengo Ando, Masakazu Taniguchi, Yoichi Asano, Yukihiro Kankaku et autres

Fourier Neural Operator Approach for Ionospheric Phase Compensation in L-Band SAR Interferometry

Kazuki Yanagiya, Yutaro Shigemitsu, Takeshi Motohka, Takeo Tadono

The ionosphere introduces path delay phases into Interferometric Synthetic Aperture Radar (InSAR) images, degrading the accuracy of ground deformation measurements particularly for long-wavelength L-band systems. Analytical split-spectrum estimation can become unstable in non-ideal cases due to decorrelated sub-band interferograms, phase-unwrapping errors, and …

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Advanced Land Observing Satellite-4 (ALOS-4) for Monitoring Disaster, Land Deformation, and Subsidence

Yukihiro Kankaku, Yoshihisa Arikawa, Satoko Horiyama Miura, Takeshi Motohka et autres

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Post-launch operational results and current status of ALOS-4

Keisho Ito, Yukihiro Kankaku, Takeshi Motohka, Takeo Tadono et autres

The Advanced Land Observing Satellite-4 (ALOS-4) was launched on July 1, 2024. It is the latest satellite in the ALOS series, a line of earth surface observation satellites developed by the Japan Aerospace Exploration Agency (JAXA). ALOS-4 carries two key instruments: Phased …

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Introduction of PALSAR Series : Development of SAR Antenna

Masanobu Shibata, Shusuke Ota, Shohei Nakamura, Yu Okada et autres

Advanced Land Observing Satellite-4 (ALOS-4) is a Japanese 4th generation L-band Synthetic Aperture Radar (SAR) satellite, developed by Mitsubishi Electric Corporation under contract to Japan Aerospace Exploration Agency (JAXA). Phased Array type L-band Synthetic Aperture Radar-3 (PALSAR-3) onboard ALOS-4 is the third …

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PALSAR-3 Mission Initial Check-Out and CAL/VAL Results

Masanobu Shibata, Shunsuke Ota, Shinnosuke Kondo, Masataka Yajima et autres

ALOS-4 is a L-band SAR satellite launched in July 2024. Phased Array type L-band Synthetic Aperture Radar (PALSAR-3) system onboard ALOS-4 is capable of high resolution and wide swath observation. It can achieve high resolution (3m) with 4 times wider swath width …

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The Performance Result of ALOS-4 Sar Experimental Modes

Shunsuke Ota, Masanobu Shibata, Shinnosuke Kondo, Masataka Yajima et autres

This paper describes the experimental modes on PALSAR-3 onboard ALOS-4. ALOS-4, launched in July 2024, is a L-band SAR satellite which operates with Spotlight, Stripmap, and ScanSAR modes. It can achieve high resolution (3m) with 4 times wider swath width compared to …

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Advanced Land Observing Satellite-2 “DAICHI-2” (ALOS-2): Overview and operational status

Takeo Tadono, Masato Ohki, Takeshi Motohka, Åke Rosenqvist et autres

This article presents an overview and discusses the significance of theAdvanced Land Observing Satellites-2(ALOS-2, “DAICHI-2”).ALOS-2, the successor to theALOSsynthetic aperture radar (SAR) mission, was launched in 2014 and has been operating smoothly beyond its design mission life of seven years. The Phased …

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Advanced Land Observing Satellite-4: Mission Concepts and Technical Overview: Pioneering a new era of L-band SAR

Masato Ohki, Takeshi Motohka, Yukihiro Kankaku, Satoko Horiyama Miura et autres

JAXA’s Advanced Land Observing Satellite-4 (ALOS-4) is the successor to the ALOS-2 satellite. On July 1, 2024, ALOS-4 was successfully launched, and on July 15, it acquired the first observation images by PALSAR-3. The new satellite carries a Phased Array-type L-band Synthetic …

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An analysis of the potentials of L-band SAR satellites for measuring azimuth motion

Cunren Liang, Eric Jameson Fielding, Zhen Liu, Takeshi Motohka et autres

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Operational Calibration Result of the Advanced Land Observing Satellite-2 (ALOS-2)

Takeo Tadono, Masato Ohki, Takeshi Motohka, Osamu Isoguchi et autres

This paper summarizes an operational calibration result of the Advanced Land Observing Satellites-2 (ALOS-2, nicknamed "DAICHI-2"). ALOS-2, the successor to the Phased Array-type L-band Synthetic Aperture Radar (PALSAR) onboarded ALOS "DAICHI" from 2006 to 2011, was launched in 2014 and has been …

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