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本研究採用台灣地區 GPS 觀測資料，探討不同時期電離層電子含量變 化，對於 PPP 定位精度之影響，結論如上所述，未來可嘗試之後續研究如 下：
(一) 本研究僅使用 RINEX_HO 中電離層地圖方法取得總電子含量，以 估計電離層高階項誤差，並未使用其他以觀測量計算總電子含量之方 法，後續研究可嘗試以不同估計方法改正電離層高階項誤差，再將改 正前、後觀測檔案分別執行 PPP，以探討使用不同方法估計總電子含 量，對於 PPP 定位精度是否有影響。
(二) 本研究所進行之實驗中，並未探討電子含量之 27 日週期變化，後 續研究可針對此週期變化，做進一步之研究。
(三) 在單日變化分析中，僅探討電離層高階項誤差之綜合影響，未將 I2 與 I3 分開討論，後續研究可針對 I2、I3 之單日變化進行探討。
(四) 本 研 究 中 並 未 改 變 RINEX_HO 之 預 設 參 數 檔 案 (rinex_ha_param.dat，檔案內容詳見第三章第三節)中的值，未來可嘗試 改變參數值，以比較不同參數之變化最終對於定位精度之影響。
(五) 本研究中未考慮衛星網形分布、仰角與電離層誤差之關係，未來 可進一步探討其對於最終 PPP 定位結果之影響。
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三、網頁參考文獻
森泰儀器公司，2015，雙星 eGPS 差分訊號雲端服務網（Civil-NET）。
http://60.249.51.150:8080/geopp_gnweb/gnweb.html，取用日期：2015 年 11 月 27 日。
Geoscience Australia., 2016, AUPOS - Online GPS Processing Service.
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http://solarscience.msfc.nasa.gov/SunspotCycle.shtml
Silver. M., 2013, A Comparison of Free GPS Online Post-Processing Services.
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Rovira Garcia. A., 2010, Design, implementation and testing of GPS data processing modules for GNSS navigation. Retrived March 7, 2016 from
UPC. on the World Wide Web:
http://upcommons.upc.edu/bitstream/handle/2099.1/8985/1%20PFC%20
%20Memory.pdf
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