提昇單頻GPS接收儀觀測量定位精度之研究

由於GPS單頻接收儀較雙頻接收儀價廉，目前GPS單頻接收儀的使用者仍佔有相當之比例，本文乃透過一些後級處理以提昇單頻觀測量之定位精度，並藉此尋求單頻觀測量之最佳處理流程。本文使用瑞士Berne大學發展之Bernese 4.0 GPS資料處理軟體，對單頻觀測量進行後級處理，並以基線長之重複性來評估精度。應用此處理流程，計算七天之單頻觀測量所得的基線長重複性為8.4mm+0.4ppm，已可達到美國FGCC所提出之GPS相對定位測量等級中的2-Ⅰ級。而在觀測時間長度達6小時後，單頻定位精度已有明顯改善，中長基線平均可得0.6ppm左右之精度。若施以更多之觀測量，則應可證明本文所提之處理流程的可靠性與穩定性，確實可應用於高精度工程測量。

關鍵字

單頻觀測量；重複性；電離層折射改正模式

並列摘要

Beacuse the cost of single frequency GPS receivers is lower than dual frequency ones, many users still use this low-cost equipment now. This paper would like to discuss how to improve precision by means of some analysis and post-process. and look for optimal process for single frequency observation.This paper discuss using Bernese V4.0 GPS software developed by Berne University of Switzerland to process observations, and evaluate precision by repeatability of baselines. In these process, the repeatability of baselines calculated for seven-day observation is 8.4 mm+0.4 ppm. This result is close to Level 2-Ⅰ precision introduced by U.S. FGCC. Moreover, significant improvenent on precision is available after six-hour observation. Average precision for the long or medium baselines tends to 0.6 ppm. If more observation is engaged in, it will provide more reliable and stable result to corroborate this research process. Therefore, apply this process on high accuracy engineering survey would be available.

並列關鍵字

single frequency observation ； Repeatability ； Ionospheric refraction correction model

國際替代計量

提昇單頻GPS接收儀觀測量定位精度之研究

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