以連續運行基站（CORS）建立城市級電離層模型之研究－－以臺中市為例

A Study of Building City-Level Ionosphere Model by Using Continuously Operating Reference Station (CORS)-A Case Study of Taichung City

現今地面雙頻GNSS觀測量已廣泛被使用來建構電離層垂直全電子含量模型，並成為研究全球或區域電離層擾動的一項重要工具。
本研究以2013年台中市新建的連續運行基站作為題材，以CORS系統之架構，針對整個台中市地區建立城市級電離層模型。最後以電離層模型做單頻單點定位測試，該模型平均提升之定位精度可達50至60 %，而在短時間兩小時進行單點定位最佳提升定位精度可達95 %。

Nowadays, the dual-frequency GNSS magnitude has been widely used to build up the ionosphereic vertical model and become an important tool for studying global or regional ionosphereic disturbances.
The study aims at the newly built Continuous Operational Reference System of Taichung city as objects, build up the city ionosphereic model in Taichung area based on the CORS system. Last, perform the single-frequency point positioning test with the ionosphereic model, and the average accuracy increases to 50% to 60%. While within the short 2 hours, performing the single point positioning may reach the best accuracy to 95%.