巻号一覧
36 巻 (1990)
- 4 号 p. 219-
- 3 号 p. 143-
- 2 号 p. 73-
- 1 号 p. 1-
36 巻, 3 号
選択された号の論文の6件中1～6を表示しています
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日置 幸介1990 年 36 巻 3 号 p. 143-154
発行日: 1990/10/25
公開日: 2010/09/07
ジャーナル フリー測地VLBIにおいて,局の水平面内の位置を正確に求めるのは比較的簡単だが,鉛直方向の位置を精度よく決定するためには特別な注意が必要である.この注意は具体的に次の三つの点に集約できる.第一は実験のスケジューリングにおける注意であり.時刻オフセット及び大気遅延と局鉛直位置の相関を軽減するために低い仰角の観測を積極的に取り入れることである.第二はデータ解析における注意で,大気遅延の時間変化を正確に反映させることが残差の軽減に重要である.そのためには実験時間を数多くの区間に分けて大気を推定する必要があるが,解の安定性を保つためには大気状態の時間的連続性をゆるく束縛することが効果的である.最後に鉛直位置の推定値は大気のマッピング関数によって変化するので,なるべく精度のよいモデルを選択することが系統誤差を除去する上で重要となる.抄録全体を表示PDF形式でダウンロード (1134K) -
― Trimble 4000SDによる観測と解析―木股 文昭, 角野 由夫, 宮島 力雄, 奥田 隆, 石井 紘, 村田 一郎, 加藤 照之, 大久保 修平, 松本 滋夫, 平田 安廣, 綿 ...1990 年 36 巻 3 号 p. 155-167
発行日: 1990/10/25
公開日: 2010/09/07
ジャーナル フリーJapan University Consortium for GPS Research operated the Sagami Bay GPS Campaign with thirty GPS receivers both in December 1988 and in December 1989 to monitor crustal movement. This paper concerns only the data obtained during these campaigns by sixteen Trimble 4000SD dual-frequency receivers. The observations were conducted over a five day period in each year campaign. At the 1988 campaign the satellite constellation over Japan was very poor and four satellites were visible only for several tens of minutes. After the beginning of launch of block II satellites, the satellite visibility has been much improved even in Japan, and five satellites were available in the campaign of 1989. The number of baselines for which four (not five) satellites were available in analyses was only 53 in 1989 campaign, while it became 105 over for five satellites in 1989 campaign. The short term repeatability of baseline length was generally less than 1 ppm in 1988 campaign and it is shown that it has been improved to be less than 0.5 ppm for every baseline triangle in 1989 campaign. Although the changes of baseline lengths from December 1988 amount to 2.0 ppm, it can be interpreted that it is caused by poor satellite constellations in 1988 campaign and remain as apparent. The remarkable repeatability of 0.5 ppm in the 1989 campaign promises that GPS provides us the efficient observation means for the crustal motion in a wide area.抄録全体を表示PDF形式でダウンロード (1637K) -
中根 勝見1990 年 36 巻 3 号 p. 169-175
発行日: 1990/10/25
公開日: 2010/09/07
ジャーナル フリーThe numerical example shown in the report indicates that we can not get a unique solution by iterative method in case of the free-network adjustment,抄録全体を表示PDF形式でダウンロード (712K) -
藤井 陽一郎1990 年 36 巻 3 号 p. 177-184
発行日: 1990/10/25
公開日: 2010/09/07
ジャーナル フリーA special technique of network adjustment is developed for analysis of leveling data that are obtained in the area where the remarkable crustal movements are prevailing. We applied velocity model in which not only corrections to the assumed height but also rate of vertical deformation linear with time at the bench marks are assumed to be unknowns in order to take into considerations of the effect of rapid vertical crustal movements to the results of survey. On the other hand, we have sometimes tidal stations along the sea coast of the discussed region and vertical rate of crustal move ments are able to be deduced from analysis of tidal data. Thus it is desirable to com bine the determined rates at some tidal stations with the leveling data in the network adjustment. The type of present adjustment with velocity model is proved to be a specialized case of least square adjustment of network with signals under deterministic approach. Let X be corrections to the assumed coordinates, a vertical rate of deformation, and f numerical term relating to the survey data and approximated coordinates, then the observation equation is generallyV+AX+Ha=fwhere A and H are coefficient matrices of vector X and a, V is residual vector applied to the observational results. We apply least squares collocation to the above equation. In numerical calculation, we have four fundamental cases. Except the case of all free parameters in which none of X and a are fixed and A as well as H are singular, we can apply reduced normal equation for obtaining X and a separatelly. According to the type of network with some fixed heights or fixed velocities and both A and H or one of them is regular, we apply different formulas. Thus formulas for all four cases are given in the text for obtaining X and a as well as their variance-covariance matrices.抄録全体を表示PDF形式でダウンロード (684K) -
萩原 幸男1990 年 36 巻 3 号 p. 185-186
発行日: 1990/10/25
公開日: 2010/09/07
ジャーナル フリーThe conventional concept of geoid may be obsolete with the recent development of GPS technique in height determinations. We reexamine the significance of gravity anomaly and geodetic boundary-value problem from a standpoint of this new height system.抄録全体を表示PDF形式でダウンロード (295K) -
NATIONAL REPORT TO THE 13TH MEETING OF THE INTERNATIONAL GRAVITY COMMISSION TOULOUSE, SEPTEMBER 11-14, 1990THE NATIONAL COMMITTEE FOR GEODESY OF JAPAN, THE GEODETIC SOCIETY OF ...1990 年 36 巻 3 号 p. 193-217
発行日: 1990/10/25
公開日: 2010/09/07
ジャーナル フリーThis document is the quadrennial report of gravimetric works made in Japan during the period from April 1986 to March 1990. It has been prepared to submit to the International Gravity Commission of the International Association of Geodesy at its 13th meeting held in Toulouse, France, from September 11 to 14, 1990. A few of works and publications not included in the previous report presented to the 12th meeting are also supplemented. It summarizes gravimetric works such as international and domestic connections of gravity networks, absolute and relative gravity measurements, tidal and nontidal gravity changes, gravity surveys in Japan and foreign countries, data handling and mapping, geophysical interpretation of gravity data, theoretical researches of gravity field, etc. Complete references of the related articles are found in the bibliography towards the end of this report. The report was compiled by the editor from manuscripts submitted by various Research Institutes and University research groups. The editor is grateful to Drs. Y. GANEKO, Y. HAGIWARA, K. KAMINUMA, C. KITSUNEZAKI, M. KOMAZAWA, Y. KONG, M. KOSUGA, M. MISHINA, H. MURAKAMI, I. NAKAGAWA, S. NAKAI, S. NISHIMURA, I. OHNO, S. OKUBO, M. SATOMURA, J. SEGAWA, K. TSUKAHARA, A. YAMAMOTO and A. YOSHIDA for their assistance.抄録全体を表示PDF形式でダウンロード (5351K)
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