| 研究生: |
張玉文 Yu-Wen Chang |
|---|---|
| 論文名稱: |
全偏極化微波散射儀-發射與接收模組之研製 A Fully Polarimetric Microwave Scatterometer-Design and Implementation of Transmitter / Receiver Modules |
| 指導教授: |
丘增杰
Tsen-Chieh Chiu |
| 口試委員: | |
| 學位類別: |
碩士 Master |
| 系所名稱: |
資訊電機學院 - 電機工程學系 Department of Electrical Engineering |
| 畢業學年度: | 89 |
| 語文別: | 中文 |
| 論文頁數: | 86 |
| 中文關鍵詞: | 散射儀 、全偏極 、向量網路分析儀 、收發端 |
| 外文關鍵詞: | Scatterometer, Fully Polarimetric, VNA, tranceiver, GPIB |
| 相關次數: | 點閱:9 下載:0 |
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本系統是利用向量網路分析儀來作為訊號的來源,因為向量網路分析儀具有很好的訊號處理能力,例如系統的校準及時域的gating均可以輕易地來達成。向量網路分析儀產生的訊號是為1~2GHz,經過混波器後昇頻到9~10GHz,接著使用功率放大器來補償訊號的損失,並提昇散射儀的動態範圍以及量測的靈敏度。本系統是使用單一天線雙模態的金字塔型的號角天線,並加以連接循環器,來避免因使用多重天線而造成天線間的互相干擾。如此一來可以實現量測短距離的回波散射。再加上用電腦控制程式來切換系統的偏極化狀態以及資料的取得,如此可達到自動化全偏極化量測系統的建立。
A vector network analyzer (VNA) is used as the signal source. Due to VNA''s high ability in signal process, many features such as system calibration and time gating can be easily implemented and performed. The signal from the VNA, which ranges from 1 GHz to 2 GHz, is upconverted to 9 GHz to 10 GHz by mixers. An Amplifier is used to compensate the signal attenuation and thus raise the dynamic range and measurement sensitivity of the scatterometer. A computer-controlled switching system is implemented to alternate different polarization states, so the fully polarization measurement can be achieved. An single dual-mode pyramidal horn in conjunction with circulators is applied to avoid the antenna interference inherent in the multi-antenna system. Therefore the backscatter can be measured in short ranges. In order to conduct automatic measurements, a computer program is developed for data acquisition, switching control, and system calibration.
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