Prof Josaphat gave workshop on spaceborne synthetic aperture radar image processing for stafss and students of Ajou University and staffs of Korean satellite companies to start development of Korean Spaceborne SAR, 29 March 2012.
Prof Josaphat gave Invited Lecture at Ajou University, Korea
Prof Josaphat gave Invited Lecture at Department of Space Electronics Engineering and Department of Electronics Engineering, Ajou University, Korea to start collaboration to develop SAR onboard microsatellite between Japan and Korea on 28 March 2012.
Workshop on SAR Image Signal Processing for ODA JICA JST SATREPS Program
Circularly Polarized Synthetic Aperture Radar technology for ODA JICA-JST Program to monitor landslide on Malay Peninsula. Meeting with staffs of Universiti Sains Malaysia (USM), Universiti Tenaga Malaysia (Uniten), Multimedia University Malaysia (MMU), Department of Irrigation and Drainage (DID) Malaysia, University of Tokyo, National Research Institute for Earth Science and Disaster Prevention, JICA and JST to…
Bachelor Thesis : Kohei Sakai
Josaphat Laboratory graduated Bachelor student, Shuhei Sakai with Bachelor Thesis entitled “Observation of large area using Quad Rotor Unmanned Aerial Vehicle” on 25 March 2012.
Bachelor Thesis : Takafumi Kawai
Josaphat Laboratory graduated Bachelor Student, Takafumi Kawai with Bachelor Thesis entitled”Research on Linear Polarization and Circular Polarization Antennas for GPS Radio Occultation” on 25 March 2012.
Ph.D Thesis : Prilando Rizki Akbar
Josaphat Laboratory graduated Dr Prilando Rizki Akbar on March 25, 2012 with Ph.D thesis entitled “Development of Circularly Polarized Synthetic Aperture Radar System for Unmanned Aerial Vehicle and Small Satellite”. 博士論文概要: プリランド リスキ アクバル 博士(工学) Development of Circularly Polarized Synthetic Aperture Radar System for Unmanned Aerial Vehicle and Small Satellite 合成開口レーダ(SAR)は夜昼間かつ全天候型センサで、地球環境の観測に多く用いられてきた。従来のSARセンサでは直線偏波による水平・垂直偏波を用い、電離層を通過する際、ファラデー効果による偏波面の回転や衛星の姿勢によって後方散乱信号の品質が低下した。また、プラットフォームが大型で消費電力も大きいなど様々な問題があった。こうした様々な問題を解決するために、本研究では無人航空機(UAV)および小型衛星搭載用の円偏波SARセンサの開発に向けて、理論的考察および数値シミュレーションを行った。円偏波SARのパラメータとして、動作周波数1.27GHzの付近における通常の3 dBビーム幅に対して、3 dB軸比ビーム幅を導入し、これらのパラメータとアンテナビーム幅およびアンテナ形状との関係について詳細に考察した。小型衛星搭載の円偏波SARの場合、このパラメータに対して、地上観測幅やパルス繰り返し周波数などの影響も検討した。その結果、最適な軸比ビーム幅を選択することによって、直線偏波SARの場合と比較して、CP-SARがより小型のアンテナで実現できることが明らかとなった。本研究により、UAVおよび小型衛星搭載の円偏波SARの実現が十分に可能であることが実証された。
Master Thesis : Iman Firmansyah
Josaphat Laboratory graduated Iman Firmansyah with Master Thesis entitled “Chirp Signal Simulation for Circularly Polarized Synthetic Aperture Radar” on March 25, 2012. He is affiliated in Indonesian Institutes of Sciences (LIPI). This research is realized chirp pulse generator for our circularly polarized synthetic aperture radar (CP-SAR) that will be installed on our unmanned aerial vehicle…
Visiting of Rector of Bogor Agricultural University (IPB) to Chiba University
Official Visiting of Rector of Bogor Agricultural University (IPB) Prof.Dr. Herry Suhardiyanto to Chiba University and facility of our Center, 22 March 2012.
Prof Josaphat gaveTalk Show in Indonesian Students Association, Tokyo
Prof Josaphat held Talk Show with Dr Arman (Attache of Indonesian Embassy) and Ari san (Young entrepreneur) for Indonesian students at Sekolah Republik Indonesia Tokyo – SRIT on 11 March 2012.
Friends of Josaphat Laboratory
Good time at Josaphat Laboratory with our friends and experts in polarimetric synthetic aperture radar (PolSAR), Unmanned Aerial Vehicle and Microsatellite, March 2, 2012 … We plan to hold SAR onboard campaigns and start to feasibility study of SAR onboard microsatellite for Indonesia. Dr Heru (Lapan), Prof Danielle (University of Hongkong), me, Prof Koo (Multimedia…