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Volume 39 (1993)
- Issue 4 Pages 327-
- Issue 3 Pages 263-
- Issue 2 Pages 57-
- Issue 1 Pages 1-
Volume 39, Issue 1
Displaying 1-3 of 3 articles from this issue
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Geodynamics and Geoid Height Researches in Japan Applying the Global Positioning System MeasurementsSeiichi SHIMADA, Tetsuro IMAKIIRE1993 Volume 39 Issue 1 Pages 1-14
Published: March 25, 1993
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSWe review the GPS measurements that have been applied to geodynamic and geoid height research in Japan. In the Nansei-shotou GPS network extending across the Ryukyu trench, the relative motion of the Philippine Sea and Eurasian plates were detected, with a convergence rate of 87±31 mm/yr and a direction of N70±30°W. In central Japan, applying a GPS fixed-point network, the instantaneous deformations during the 17 months (April 1988-August 1989) were measured. Relative to the Eurasian plate, westward motion of 28 mm/yr of a site at the northern tip of the Philippine Sea plate was detected, with southwestward motion of 18 mm/yr at a site located at the southeastern tip of the Eurasian plate. At a site inland of the Tokai district, vertical uplift with a velocity of 20 mm/yr is suggested in the Akaishi uplift zone. Baselines across Suruga Bay were observed to be continuously shortening with a rate of 16 mm/yr at the entrance to the bay and at a smaller rate inside the bay. In the seismic swarm and submarine eruption that occurred in July, 1989, east of the Izu Peninsula, a significant crustal extension of 145 mm of the 10-km baseline was detected only at the period of peak swarm activity. Geoid height was determined with an accuracy of 80-100 mm in the Kinki district and the southern Hokkaido region .View full abstractDownload PDF (2346K) -
Takao SETO1993 Volume 39 Issue 1 Pages 15-21
Published: March 25, 1993
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSResearch and development of GPS receivers in Japan was started in the early '80s by manufacturers of ship born communication and navigation devices, and also of audio= video and consumer electronics. The first single point receiver was introduced in 1984, and the first relative positioning system was produced in 1986. The three types of geodetic use receivers, are the GTT-4090 manufactured by SONY, PRESTAR designed by CRL and SGSS by SOKKIA. Each of the three systems has different design concepts. GTT-4000 has been built for the fundamental research of baseline analysis and the necessary corrections of ionospheric, tropospheric conditions etc. PRESTAR uses a beam antenna aiming to obtain precise geodetic relative position and precise satellite orbit information. SGSS is designed for the utilization of a kinematic operation.View full abstractDownload PDF (955K) -
Nobuhiro KAWAJIRI1993 Volume 39 Issue 1 Pages 23-40
Published: March 25, 1993
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSIn Japan, several kinds of spacecraft are planned to use GPS receivers for position determination of spacecraft, and navigation. These spacecraft are OREX (Orbital Reentry Experiment Vehicle) and HOPE (H-II Orbiting P1anE), SFU (Space Flyer Unit), , VSOP (VLBI Space Observatory Programme) mission using MUSES-B (Mu Space Engineering Satellite-B), and Rendezvous/Docking mission in ETS-VII (Engineering Test Satellite-VII) project. Basically three kinds of GPS navigation systems, i.e. systems of, (1) GPS standalone navigation, (2) GPS-Inertial Measurement Unit (IMU) hybrid navigation, and (3) GPS differential/relative navigation, are applied to the Japanese spacecraft . Relation between the GPS navigations and the spacecraft depends on their orbits, required precisions, relative range, and so on. The required precisions of position and velocity range from 100 m to 1 m in position and from 10 cm/sec to 1 cm/sec in velocity. As a whole, it will be feasible for the Japanese spacecraft to satisfy the required precisions with use of various configuration of GPS navigation systems.View full abstractDownload PDF (2036K)
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