e-GNSS與GNSS快速靜態測量應用於圖根加密控制測量之研究-以蘆竹及平鎮重測區為例

Implementation and Comparison of e-GNSS and Rapid Static GNSS for Topographical Densified Control Surveying - A Case Study of Lujhu Township and Pingzhen City Area

本研究成功的使用兩種先進的衛星定位技術─GNSS全球衛星導航定位系統與e-GNSS網路化即時動態定位系統，應用於地籍圖重測區加密圖根控制測量；並選取102年度桃園縣蘆竹及平鎮兩個重測區作為研究區域，與已公告確定之TWD97圖根坐標進行比較。本研究之結果如下：（1）GNSS快速靜態求解，證實因可視衛星數較單一GPS系統增加66-100%衛星觀測量，增加基線觀測量及週波未定值求解成功率，坐標解算成功率GNSS快速靜態（5、10、15分鐘）即可達94～95%，觀測20分鐘時更可增加至95～97%的解算成功率；觀測成果與公告坐標進行比較方面，有91%以上的坐標觀測誤差在2公分以內。（2）在使用e-GNSS即時動態點位求解時，坐標解算成功率時可達85.7～95%以上；成果與公告坐標進行比較，有83.4%以上的坐標觀測誤差在2公分以內，皆符合現有作業規範。本研究證明GNSS快速靜態測量與e-GNSS定位系統皆可大幅縮短觀測時間，提供高精度、高品質及更快速之測繪方式。由本研究成果推論，GNSS快速靜態測量因不受限網路通訊問題，適合全區域使用；e-GNSS定位系統則因受限網路通訊干擾問題，適合運用在網路通訊較佳之區域。 In this study, we apply two kinds of satellite positioning technology to Densified Cadastral Control Resurveying, which are GNSS ( Global Navigation Satellite system) and e-GNSS (Electroncial-Global Navigation Satellite System). Two re-surveying areas in Lujhu Township and Pingzhen City, Taoyuan County are selected as the study areas, and the result are compared with the declared TWD97 coordinates of topographical control points in 2013. The results are summarized as follows: (1) With Rapid Static GNSS, baseline observations were increased and the success rate of solving integer ambiguities are improved. So the visible satellites were increased by 66-100% with GPS system only. The success rate of solving baselines will reach 94~95% in 5, 10 and 15 minutes. Furthermore, the success rate of solving baselines reach 95~97% in 20 minutes. We compare the calculated coordinates with the known coordinates, and more than 91% of the discrepancies were within 2 cm. (2) With e-GNSS, the success rate was increased by 85.7-95%. The compare between the calculated and the known coordinates, and more than 83.4% of the discrepancies are under 2 cm. It shows that all calculated results meet the accuracy specifications by MOI(Ministry Of the Interior). This study demonstrates that both rapid static GNSS and e-GNSS can significantly reduce the observation time, achieve high precision, high quality in surveying and mapping. From this work, It can be concluded that rapid static GNSS is suitable in common region for its unrestricted property by Internet communication, while e-GNSS is appropriately applied in area for a better internet communication.

In this study, we apply two kinds of satellite positioning technology to Densified Cadastral Control Resurveying, which are GNSS ( Global Navigation Satellite system) and e-GNSS (Electroncial-Global Navigation Satellite System). Two re-surveying areas in Lujhu Township and Pingzhen City, Taoyuan County are selected as the study areas, and the result are compared with the declared TWD97 coordinates of topographical control points in 2013. The results are summarized as follows: (1) With Rapid Static GNSS, baseline observations were increased and the success rate of solving integer ambiguities are improved. So the visible satellites were increased by 66-100% with GPS system only. The success rate of solving baselines will reach 94~95% in 5, 10 and 15 minutes. Furthermore, the success rate of solving baselines reach 95~97% in 20 minutes. We compare the calculated coordinates with the known coordinates, and more than 91% of the discrepancies were within 2 cm. (2) With e-GNSS, the success rate was increased by 85.7-95%. The compare between the calculated and the known coordinates, and more than 83.4% of the discrepancies are under 2 cm. It shows that all calculated results meet the accuracy specifications by MOI(Ministry Of the Interior). This study demonstrates that both rapid static GNSS and e-GNSS can significantly reduce the observation time, achieve high precision, high quality in surveying and mapping. From this work, It can be concluded that rapid static GNSS is suitable in common region for its unrestricted property by Internet communication, while e-GNSS is appropriately applied in area for a better internet communication.