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Papers by Akio Iso

Research paper thumbnail of 大型展開アンテナの試作モデルの評価と宇宙実証方法の提案

Journal of the Japan Society for Aeronautical and Space Sciences, 1992

Research paper thumbnail of Advanced domestic digital satellite communications systems experiments

IEE Proceedings F Communications, Radar and Signal Processing, 1984

The characteristics of advanced digital transmission systems were measured using newly developed ... more The characteristics of advanced digital transmission systems were measured using newly developed small earth stations and a K-band (30/20 GHz) and C-band (6/4 GHz) communication satellite. Satellite link performance for data, facsimile, video and packet switching information transmission at bit rates ranging from 6.4 kbit/s to 6.3 Mbit/s have been confirmed, using a small K-band (30/20 GHz) earth station and a demandassignment time division multiple access (DA-TDMA) system. A low-capacity omni-use C-band (6/4 GHz) terminal experiment has verified a telephone channel transmission performance by spread-spectrum multiple access (SSMA). Single point to multipoint transmission characteristics of the 64 kbit/s data signals from the computer centre were tested using a receive-only 4 GHz earth terminal. Basic satellite link performance was confirmed under clear-sky conditions; however, evaluation of the satellite link is also described based on rain attenuation and sun-transit interference data. Precise satellite orbit and attitude keeping experiments were carried out to obtain precise satellite antenna pointing accuracy for development of K-band earth stations that do not require satellite tracking equipment. Precise station keeping accuracy of 0.02 degrees was obtained.

Research paper thumbnail of Development of a New Pre-Lining Method-Monobec Method

This report presents the outline of the MONOBEC machine experimentally made for an assumed single... more This report presents the outline of the MONOBEC machine experimentally made for an assumed single-track tunnel as well as the results of cutting and filling tests made on a mock ground. The MONOBEC (Mono-Bent-Cutter) method is being developed as a pre-lining method to prevent surface settlements and maintain the stability of the working face when a tunnel is driven by NATM through urban unsolidified grounds in Japan. The features of this method are as follows: 1) A solt is pre-cut ahead of the face and exactly along the tunnel profile using an S-shaped bend-type chainsaw cutter; and 2) Shooting concrete into the slot, a continuous concrete lining is formed.

Research paper thumbnail of Consideration on minimizing the mass of communications equipments for the mobile communications satellite

Journal of the Japan Society for Aeronautical and Space Sciences, 1989

Research paper thumbnail of 移動機アンテナの仰角放射特性を補償する衛星アンテナのビーム形成法

Journal of the Japan Society for Aeronautical and Space Sciences, 1998

Research paper thumbnail of Minimizing the Mass of a Multi-Beam Mobile Communications Satellite by Using Elliptical Beams

Journal of the Japan Society for Aeronautical and Space Sciences, 1993

Research paper thumbnail of Geostationary station acquisition maneuvers for the “CS” spin-stabilized communication satellite

Acta Astronautica, 1983

Attitude reorientation maneuvers were conducted three times on the transfer orbit to obtain the a... more Attitude reorientation maneuvers were conducted three times on the transfer orbit to obtain the apogee kick motor firing attitude of the Medium Capacity Geostationary Communication Satellite for Experimental Purposes (CS) on the third apogee. After two attitude and five orbit maneuvers on the drift orbit, the CS attained geostationary orbit with station keeping accuracy of +0.1 ° seven days after launch.

Research paper thumbnail of 大型展開アンテナの試作モデルの評価と宇宙実証方法の提案

Journal of the Japan Society for Aeronautical and Space Sciences, 1992

Research paper thumbnail of Advanced domestic digital satellite communications systems experiments

IEE Proceedings F Communications, Radar and Signal Processing, 1984

The characteristics of advanced digital transmission systems were measured using newly developed ... more The characteristics of advanced digital transmission systems were measured using newly developed small earth stations and a K-band (30/20 GHz) and C-band (6/4 GHz) communication satellite. Satellite link performance for data, facsimile, video and packet switching information transmission at bit rates ranging from 6.4 kbit/s to 6.3 Mbit/s have been confirmed, using a small K-band (30/20 GHz) earth station and a demandassignment time division multiple access (DA-TDMA) system. A low-capacity omni-use C-band (6/4 GHz) terminal experiment has verified a telephone channel transmission performance by spread-spectrum multiple access (SSMA). Single point to multipoint transmission characteristics of the 64 kbit/s data signals from the computer centre were tested using a receive-only 4 GHz earth terminal. Basic satellite link performance was confirmed under clear-sky conditions; however, evaluation of the satellite link is also described based on rain attenuation and sun-transit interference data. Precise satellite orbit and attitude keeping experiments were carried out to obtain precise satellite antenna pointing accuracy for development of K-band earth stations that do not require satellite tracking equipment. Precise station keeping accuracy of 0.02 degrees was obtained.

Research paper thumbnail of Development of a New Pre-Lining Method-Monobec Method

This report presents the outline of the MONOBEC machine experimentally made for an assumed single... more This report presents the outline of the MONOBEC machine experimentally made for an assumed single-track tunnel as well as the results of cutting and filling tests made on a mock ground. The MONOBEC (Mono-Bent-Cutter) method is being developed as a pre-lining method to prevent surface settlements and maintain the stability of the working face when a tunnel is driven by NATM through urban unsolidified grounds in Japan. The features of this method are as follows: 1) A solt is pre-cut ahead of the face and exactly along the tunnel profile using an S-shaped bend-type chainsaw cutter; and 2) Shooting concrete into the slot, a continuous concrete lining is formed.

Research paper thumbnail of Consideration on minimizing the mass of communications equipments for the mobile communications satellite

Journal of the Japan Society for Aeronautical and Space Sciences, 1989

Research paper thumbnail of 移動機アンテナの仰角放射特性を補償する衛星アンテナのビーム形成法

Journal of the Japan Society for Aeronautical and Space Sciences, 1998

Research paper thumbnail of Minimizing the Mass of a Multi-Beam Mobile Communications Satellite by Using Elliptical Beams

Journal of the Japan Society for Aeronautical and Space Sciences, 1993

Research paper thumbnail of Geostationary station acquisition maneuvers for the “CS” spin-stabilized communication satellite

Acta Astronautica, 1983

Attitude reorientation maneuvers were conducted three times on the transfer orbit to obtain the a... more Attitude reorientation maneuvers were conducted three times on the transfer orbit to obtain the apogee kick motor firing attitude of the Medium Capacity Geostationary Communication Satellite for Experimental Purposes (CS) on the third apogee. After two attitude and five orbit maneuvers on the drift orbit, the CS attained geostationary orbit with station keeping accuracy of +0.1 ° seven days after launch.

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