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題名 | GPS衛星雷射測距資料使用於絕對定位之研究=Laser Tracking to GPS Satellites for Geodetic Absolute Positioning |
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作者姓名(中文) | 楊名; 洪志偉; 曾清涼; | 書刊名 | 測量工程 |
卷期 | 41:4 1999.12[民88.12] |
頁次 | 頁3-20 |
分類號 | 440.98 |
關鍵詞 | 衛星電射測距; 全球定位系統; 絕對定位; Satellite laser ranging; Global positioning system; Absolute positioning; |
語文 | 中文(Chinese) |
中文摘要 | 大地測量之傳統與最主要的任務之一即為建立以地心為基準的大地參考系統( Geodetic Reference System),以及精確地定出公分級精度之全球三維大地控制網。為達 成以上之目標,大地測量必須具備求出地球表面上任意點位相對於地心的精確位置的能力 。今日普遍使用的全球定位系統GPS(GlobalPositioning System)僅可提供約100公尺等級 之單點絕對定位成果,而利用相對定位原理之GPS衛星測量方法與甚長基線法VLBI(Very Long BaselineInterferometry)雖可提供精確之相對定位成果,但卻無法直接求解出高精 度的測站絕對坐標(即測站相對於地心的相對坐標)。 目前的太空大地測量方法中,唯有衛星雷射測距(Satellite Laser Ranging,SLR)能 直接提供測站相對於地心的精密坐標,可用於測定地球質量中心位置,建立公分級精度之 全球性大地參考框架,以及求解地球旋轉參數之絕對量。對傳統的三角三邊測量方法或是 現今流行的GPS衛星測量而言,這是無法獨自實現的目標,說明了衛星雷射測距對於大地 測量之重要性。 |
英文摘要 | One of the traditional and principal missions of geodesy is to determine a geo-centered geodetic reference system and establish the according high accuracy geodetic control network. In order to achieve the above goal, the ability to determine the position of an arbitrary point on the surface of the earth is needed. Familiar satellite geodesy methods such as Global Positioning System (GPS) and Very Long Baseline Interferometry (VLBI) can only provide accurate relative positioning capability. Only Satellite Laser Ranging (SLR) can generate precise absolute positions (or relative positions to the mass center of the earth). Consequently, SLR is crucial to the determination of a geo-centered geodetic reference system, which cannot be solely decided by relative positioning methods. This research uses SLR data in 1994 from the two GPS satellites mounted with retro-reflectors, PRN (Pseudo Random Number) 35 and PRN 36. Around 2000 SLR observations were taken from 13 stations. The IGS (International GPS Service for Geodynamics) precise ephemeris for the GPS satellites is held fixed, and the absolute coordinates of the 13 stations are estimated. During the data reduction process, correction models including atmospheric refraction correction, satellite's center of mass correction, solid earth tides, ocean loading, and earth rotation correction are applied. Comparisons between the experimental results and the IERS (International Earth Rotation Service) published station coordinates show that most coordinate differences are within±110 cm. Around half of the coordinate differences are within±6 cm. Most of the standard deviations of the estimated coordinates are within±5 cm, except for 3 stations with very few SLR observations. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。