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基於GPS現代化之單曆元及多曆元精密單點定位精度分析

Analysis of Positioning Accuracy with Single/Multi-Epoch Precise Point Positioning Based on GPS Modernization

摘要


2005年美國正式啟動第一顆Block IIR-M衛星,亦代表GPS科技時代已邁向GPS現代化階段,而Block IIR-M衛星在第二載波頻段調製C/A電碼,簡稱L2C觀測量,供使用者接收運用。因此,也提供雙頻使用者完整的C/A電碼進行定位研究,如精密單點定位常使用之無電離層(Ionosphere-free,本文簡稱IF)線性組合,除雙頻P電碼之組合,尚可加入雙頻C/A電碼進行相關研究。 本研究蒐集具有L2C觀測量之RINEX (The Receiver Independent Exchange Format)觀測檔,進行精密單點定位之研究。本實驗取國際L2C追蹤站之PGC5、SJRP、NYAC及HRAC等四站數據資料實作。研究成果顯示,加入較多L2C觀測量時,其定位精度的提升率最顯著,在平面精度最佳提升率可達25.14%,而高程精度可達24.50%。

並列摘要


The first Block IIR-M satellite was launched by U.S. in 2005 which denoted that GPS age stepped into Modernized GPS. This new C/A codes of GPS satellite which have modulated in L2 frequency band (L2C) offer users to receive and apply, and therefore provide dual-frequency users the whole C/A codes to proceed study. For example, precise point positioning (PPP) often use ionosphere-free (IF) linear combination which add dual C/A codes besides dual P codes to research. The L2C observations of six-station collected from the international L2C network were used to test the algorithms of PPP. In this research, the algorithms of PPP are based on dual-frequency codes ionosphere-free (IF) linear combinations. The outcomes of testing shows that by adding the more L2C observations, the higher positioning accuracy. It can reach 25.14% in horizontal direction and 24.50% in vertical direction.

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