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Volume 34 (1988)
- Issue 3-4 Pages 157-
- Issue 2 Pages 97-
- Issue 1 Pages 1-
Volume 34, Issue 2
Displaying 1-4 of 4 articles from this issue
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Yoichi FUKUDA, Jiro SEGAWA, Hiroshi WATANABE, Atsushi IWASITA1988 Volume 34 Issue 2 Pages 97-108
Published: August 25, 1988
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSU.S. Navy satellite GEOSAT provides a new data set of radar altimeter. It is the first satellite to measure the time variations of sea surface heights over a long time from a repeating orbit. Although a repeating orbit has a disadvantage in spatial resolution, it has some benefits as removing oceanographic variations, improving measurement accuracy and so on. Therefore, the GEOSAT data has been newly processed to obtain an altimetric geoid and gravity anomalies around Japan. As the GEOSAT mission will last at least for 1-2 years and the data has been accumulating, the obtained results are just preliminary ones. However the accuracy of the altimetric geoid has reached to ±20-30 cm, ignoring time invariant terms of sea surface topography.View full abstractDownload PDF (3417K) -
Based on Experiments with Macrometer IIHiromichi TSUJI, Kouji INOUE, Akifusa ITABASHI, Yuki KUROISHI, Makoto ...1988 Volume 34 Issue 2 Pages 109-123
Published: August 25, 1988
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSGPS interferometric observation results using MacrometerII are reported. Those observations were carried out in Japan for a variety of baseline lengths during the period from March 1987 to March 1988. From repeatability analysis it is concluded that even under a current imperfect satellite configuration over Japan 1-2 ppm accuracy of base line lengths can be attainable with the GPS interferometric positioning.View full abstractDownload PDF (1731K) -
Makoto MURAKAMI, Hiromichi TSUJI, Yuki KUROISHI1988 Volume 34 Issue 2 Pages 125-135
Published: August 25, 1988
Released on J-STAGE: July 05, 2011
JOURNAL FREE ACCESSA geometric interpretation is proposed for the GPS interf erometric positioning which utilizes double differenced carrier beat phase observables. It is concluded that positions of receiver antennas at unknown points are determined geometrically referring only to satellite positions, but not to the fixed position involved in observations. An explanation is given for the observational fact that the spatial distribution of the positioning errors is independent of baseline orientations. In this interpretation a hyperboloid is assigned to a double differenced phase which is associated with two satellites and two receivers. The intersection of three hyperboloids determines uniquely the position of the unknown station when a total of four satellites is observed simultaneously. Satellite constellation requirements for a reliable GPS observation are also discussed in the framework of this geometric interpretation.View full abstractDownload PDF (2304K) -
Yuki KUROISHI, Makoto MURAKAMI, Hiromichi TSUJI1988 Volume 34 Issue 2 Pages 137-149
Published: August 25, 1988
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSA simulation study was carried out to find explanations for the following observational facts found in the GPS interferometric positioning by the Geographical Survey Institute: 1) The positioning results are sensitive to the unmodeled systematic errors remaining in the observables. 2) The spatial error distribution of position is independent of baseline orientation.The both phenomena are confirmed in this study to be natural for GPS observations in Japan where satellite constellation is imperfect. Conclusions obtained are consistent with the results from a geometric interpretation proposed in a different paper by the authors. It is also confirmed that positioning results are more stable under a better satellite configuration currently available in U.S.A.View full abstractDownload PDF (1523K)
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