| 研究生: |
吳清瀜 Wu, Ching-Jung |
|---|---|
| 論文名稱: |
台灣南部GPS網路即時動態定位之精度分析 Positioning Accuracy Analysis of GPS Network RTK in Southern Taiwan |
| 指導教授: |
饒瑞鈞
Rau, Ruey-Juin |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 地球科學系碩士在職專班 Department of Earth Sciences (on the job class) |
| 論文出版年: | 2007 |
| 畢業學年度: | 95 |
| 語文別: | 中文 |
| 論文頁數: | 95 |
| 中文關鍵詞: | 網路即時動態定位 、全球定位系統 、虛擬參考站 |
| 外文關鍵詞: | Network RTK, GPS, Virtual Reference Station RTK |
| 相關次數: | 點閱:101 下載:5 |
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Real Time Kinematic(RTK)測量具有施測迅速、無需後處理的計算作業,具有高精度即時定位效能的優點。然而當參考站和移動站間的距離增加時,則會因電離層、對流層、軌道誤差等系統誤差的影響,使得空間相關性之差異增大而降低定位精度,所以 RTK 施測的有效距離有一定的限制,主站與移動站施測時之基線間距在10 ㎞,只能達到公分級精度。
本研究以台灣南部地區為測試區域,應用現行內政部土地測量局所建置之全國性電子化 e-GPS 衛星定位測量基準網,計6個連續觀測站,配合中央地質調查所之連續觀測站觀測資料計8個連續觀測站(GS28~GS35)。對2006年第276天之觀測資料檔(30秒一筆)進行解算。以網路 RTK 定位之模式,建構區域性定位誤差模式,並配合虛擬參考站VRS-RTK 技術,進行 VRS 動態定位與傳統單站 RTK 動態定位比較;在各種網形實驗結果顯示, VRS-RTK 於所規劃之網形3(主站間距平均基線距離為34㎞),其內插網形之平面精度為3公分以內,高程精度4.5公分以內,且其解算成功率可達99%,涵蓋面積可達約550平方公里;除了應該有最合適的網型間距,而且從各外插網形來看移動站距離基線越近,其精度越高,極限外插距離約6到7公里。另從各網形之定位精度、解算成功率及PDOP數值圖之表現來看,其PDOP與定位精度並無絕對相關性。
The advantage of GPS RTK positioning technique is the high-accuracy in positioning and fast surveying without post-processing. But it has disadvantage that when the distance between the reference station and the rover station increases, the systematic errors of ionosphere, troposphere, and orbit may affect the accuracy of positioning. The rover is usually required to locate within about 10 kilometers of the reference station, in order to acquire the centimeter-level accuracy.
The study used southern Taiwan as the test area for VRS-RTK analysis. There are total ten continuous GPS stations for the analysis; three are part of the Land Survey Bureau eGPS network and eight (GS28-GS35) are from the Central Geological Survey. The observation data (one data per 30sec) on the 276th day in the Year 2006 is used. Comparing VRS-RTK with traditional single station RTK; VRS-RTK results are less affected by the atmosphere factor, however the test results show that a maximum station interval of 34 kilometers revealing the horizontal positioning accuracy within 3 cm, and within 4.5 cm for the height component and the success rate reaches 99%,the area of the covered field can reach to 550 kilometer square. Besides the size of the network, the range for successful VRS-RTK positioning outside the network is about 6 ~ 7 kilometer. Comparing the positioning accuracy, success rate and PDOP numbers of all networks show that the PDOP numbers do not seem to affect the positioning accuracy.
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