單頻RINEX 3.02檔案編修：六龜D015大規模崩塌潛勢區簡易觀測站數據前處理紀實

Error Removal of Single Frequency RINEX 3.02 File: The Preprocessing of Kaohsiung Liugui Monitoring Station Data

為達成GNSS數據之流通，國際大地測量界制定RINEX檔案格式，做為標準。又因為GNSS系統之增加與訊號結構之變遷，RINEX版本隨時間修改。當前重要的版本包含RINEX 2.11與RINEX 3.02，而兩者並不相容，其間有相當大之差異。目前兩者並存，據觀察，有逐漸採用RINEX 3.02及後續其他版本如RINEX 3.03、3.04之趨勢。或由於RINEX 3.02為新近發展之格式，以該格式提供之數據，檔案中錯誤之發生頻率顯著的較以RINEX 2.11提供者為高。本研究團隊在處理高雄市六龜區D015大規模崩塌潛勢區簡易觀測站之部份數據時，經歷大量之RINEX 3.02檔案錯誤。為能夠進行後續分析，需就所獲得之數據，全面檢查修正。處理過程中，屢經摸索、測試，耗時甚多。為期提供各界在有相同需求時處理之參考，本文謹就作業最後建立之處理方式，記述其間經歷，就教諸先進。本研究所處理數據為GPS與BeiDou（北斗）單頻觀測量，但是處理流程應具有廣泛性，亦可為多星多頻數據前處理參考。 For the interoperability of GNSS data, the international geodesy society established RINEX format as the data exchange standard. Due to the increase of GNSS constellations, and new signal structures, RINEX is updated along with time. The major editions include RINEX 2.11 and RINEX 3.02. These two versions are not compatible with each other. Both editions are adopted at present, but there is a visible trend towards RINEX 3.02 and newer editions, such as 3.03, 3.04. Likely due to the fact that RINEX 3.02 is newly developed and endorsed, form error in GNSS data of this format occurs more frequently than those in RINEX 2.1. While processing the GNSS data of a large-scale landslide monitoring network located in Liugui, Kaohsiung city, site identification D015, a large amount of data error was encountered. To facilitate further analysis, pre-processing is required. This writing documents what was learned in the pre-processing of the data. Because this process is new to the authors, and likely also new to society, this written documentation may be informative for people with similar needs. The data processed in this study were GPS and BeiDou single frequency observations. But, a similar processing scheme may also be applied to datasets with multi-constellations and multi-frequencies.