結合NNSS與GPS/MET衛星資料於電離層斷層掃描觀測及其比較

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Title:	結合NNSS與GPS/MET衛星資料於電離層斷層掃描觀測及其比較
Authors:	劉建廷;Jian-Tin Liu
Contributors:	太空科學研究所
Keywords:	電離層;斷層掃描;tomography;nnss;LITN;GPS/MET
Date:	2001-07-10
Issue Date:	2009-09-22 09:45:17 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	電離層斷層掃描技術已經發展許多年，早年的觀測技術利用地面接收站接收衛星訊號。在1994年，中央大學建立低緯電離層斷層掃描系統（Low-latitude Ionosheric Tomography Network, 簡稱LITN）接收美國海軍導航衛星系統（Naval Navigation Satellite System, 簡稱NNSS）衛星訊號，利用斷層掃描技術從事電離層的研究，其中包含上海、溫州、中壢、高雄、碧瑤、馬尼拉等六個地面接收站。本文中提到另一個觀測方法為全球衛星定位/氣象系統（Global Positioning System/METorology, 簡稱GPS/MET）。其系統利用一顆低軌道衛星（Microlab-1）接收GPS衛星訊號來觀測電離層及大氣層變化。本文運用這兩種方法觀測東經121度，北緯0度至40度的電離層電子密度分佈，並利用MART演算法迭代計算其斷層掃描重建的結果，並嘗試著結合兩者全電子含量（Total Electron Content, 簡稱TEC）的資料，利用斷層掃描技術得到另一個觀測結果。本文中除了比較上述方法的觀測結果外，也討論LITN及GPS/MET斷層掃描觀測電離層的限制及修正方式。 Methods of computerized ionospheric tomography (CIT) from satellite radio measurements have under development in more than ten years. The earlier experiments were conduced by receiving satellite signals from ground-based stations. In June 1994, National Central University also build up the Low-latitude Ionospheric Tomography Network (LITN) including six ground stations to receive the Naval Navigation Satellite System (NNSS) signals (150MHz and 400MHz). The six receiving stations are Manila (120.7˚E, 14.6˚N)、Baguio (121.0˚E, 16.4˚N)、Kaohsiung (120.1˚E, 22.5˚N) 、Chungli (121.1˚E, 25.0˚N) 、Wenzhou (121.4˚E, 28.0˚N)、Shanghai (122.1˚E, 31.0˚N). Furthermore, a recent mission termed the Global Positioning System/Meteorology (GPS/MET) program used a low Earth orbiting (LEO) satellite (Microlab-1) to receive multi-channel GPS carrier phase singles (1.5GHz and 1.2GHz) and demonstrate active limb sounding of the Earth’s atmosphere and ionosphere. In this paper, we have implemented Multiplicative Algebraic Reconstruction Technique (MART) to the ionospheric electron density inversion from measured total electron content (TEC) through the radio observations of the GPS singles, the NNSS signals, and both of the systems and reconstruct two-dimensional ionospheric structures. We are also going to compare with the tomography result and show good agreement for both of the GPS/MET and LITN programs.
Appears in Collections:	[Graduate Institute of Space Science] Department of Earth Sciences

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