2006 Fiscal Year Final Research Report Summary
IMPROVEMENTS OF ACCURACY OF DISPLACEMENT MEASUREMENTS USING GPS FOR MONITORING THE STABILITY OF SLOPES
| Project/Area Number |
17560445
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geotechnical engineering
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| Research Institution | YAMAGUCHI UNIVERSITY |
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Principal Investigator |
SHIMIZU Norikazu YAMAGUCHI UNIVERSITY, GRADUATE SCHOOL OF SCIENCE AND ENGINEERING, PROFESSOR, 大学院理工学研究科, 教授 (70150357)
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| Project Period (FY) |
2005 – 2006
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| Keywords | DISPLACEMENT MEASUREMENTS / GPS / SLOPEMITIGATION STABILITY / MONITORING STABILITY / FIELD MEASUREMENTS / DISASTER / ATMOSPHERIC DELAY / PRECISE 3D MEASURENTS |
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| Research Abstract |
In order to improve the reliability of displacement measurements, using the Global Positioning System, it is an essential task to detect the exact displacements from measurement data scattered among various types of errors. This research discusses two important issues concerning improvement of the accuracy of GPS displacement measurements.
The first one is the atmospheric delay caused by changes in weather conditions as an important factor in the measurement errors. An error correction method for it has been proposed. The method was applied to practical measurement results in order to verify it.
The second issue is an influence of obstacles above a sensor to the measurement accuracy. A field investigation was conducted to reveal the cause of the dilution of the accuracy due to the obstacles. It was found that the residual of the double difference affects on the accuracy. In order to improve the accuracy of measurements, the data of satellites which are caused the dilution was neglected on baseline analysis. The "mask procedure" was proposed to conduct it, and was verified to success improving the measurement accuracy.
The both methods succeeded in improving the measurement accuracy of GPS displacement monitoring
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