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標題: | 本地振盪器移相陣列雷達架構下之減損參數的數位校正方法 Digital Calibration for RF Impairments on Local Oscillator Phase-Shifting Array Radars |
作者: | Chia-Wei Huang 黃嘉偉 |
指導教授: | 蘇柏青(Bor-Ching Su) |
關鍵字: | 射頻減損,I/Q不平衡,相位誤差,震幅誤差,數位校正,補償,本地振盪器移相,波束形成, RF impairments,I/Q imbalance,phase error,amplitude error,digital calibration,compensation,local oscillator phase shifting,beamforming, |
出版年 : | 2013 |
學位: | 碩士 |
摘要: | 陣列被廣泛地運用在各種不同的應用上,像是雷達系統,無線電天文學,聲納系統,通訊系統,生物醫學,地震波等。在各種應用中也存在許多種不同的陣列架構。而精準度是各個不同陣列應用都必須具備的。即使如此,因為晶片製程的不理想性,會導致不可避免的誤差存在。舉例來說,像是震幅誤差,相位誤差及I/Q不平衡等。這些誤差都會對雷達陣列的應用以及陣列的波束造成影響。在文獻上,基頻移相陣列是主要被討論的架構,同時也提出了許多的數位校正方法。近幾年來,本地振盪器移相陣列越來越熱門,可惜的是,到目前為止並沒有提出針對本地振盪器移相陣列的數位校正的方法。
在這篇論文中,我們研究了本地振盪器移相陣列雷達的應用,在考慮了各種不同的射頻減損參數後,我們推倒出輸出輸入的關係式,也提出了包含估測以及補償的數位校正方法。比較表格也顯示了我們提出的數位校正方法效果比以往的類比校正方法效果都來的好。 Arrays have been widely used in many aspects, such as radar, radio astronomy,sonar, communication, medical, seismology, and etc. There are also many different kinds of radar architectures in each field. Although the accuracy of the operation is required in almost all kinds of usage of array radars, some unavoidable mismatch would still exist due to the fabrication process variations. For example, amplitude errors,phase errors, and I/Q imbalance would cause damage on beamform patterns and the usage of the array radars. In the literature, baseband phase-shifting (BBPS) arrays have been the mainly discussed and a large number of digital calibration schemes has been proposed for BBPS systems. In recent years, local oscillator phase shifting (LOPS) has becoming more and more popular. However, no digital calibration scheme has been developed for LOPS systems yet. In this thesis, the application of the radar system in the local oscillator phase shifting architecture is studied. All kinds of different RF impairments are taken into consideration, and the input-output relation is derived then. A digital calibration scheme which contains an estimation method and a compensation method is presented. A comparison table between related analog calibration schemes and the proposed method is provided and shows that the proposed method leads to significant improvement compared to the previous work. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/61757 |
全文授權: | 有償授權 |
顯示於系所單位: | 電信工程學研究所 |
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ntu-102-1.pdf 目前未授權公開取用 | 6.32 MB | Adobe PDF |
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