2015-08-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/707005摘要：系統為戶內之系統，其中安置了多個遠/近場天線系統，以元智大學之系統為例，此室內系統同時安裝了三個近場天線量測系統包括了平面近場、圓柱面近場及球面近場天線量測系統，其中戶內亦安裝了軌道，使得平面及圓柱面近場系統之機構可以同時進行小型天線輻射之量測系統。在此類天線量測系統中各個結構同時存在，使得天線量測時會面臨多重路徑之訊號干擾，此干擾對於小型天線之直接遠場輻射量測最為嚴重。本計畫利用近場系統提供之機構機制，藉以產生空間分集(Space Diversity)之特性，來抑制室內多重路徑的干擾，尤其我們利用平面量測系統之機構結合待測天線載具在軌道上移動來產生Space Diversity，藉以研究多重路徑的特性。首先採用一隻已知輻射之參考天線來界定多重路徑的特色，將此特性存於記憶體中，藉以產生一個修正係數，此修正係數可以用來修正待測天線在相同環境下所量測的結果，以去除多重路徑之干擾，恢復其正確之輻射波形。 在本計畫中我們首先探討二維之量測問題，藉以了解研究理論的正確性，其次將之衍生至三維的量測問題，作為天線量測之一般多重干擾的方法。與其他之多重路徑相較，本計畫所採用的方法僅需單一的頻率，並不須使用時域窄脈衝(Short Pulse)及多頻率之資料掃瞄之操作，待多重路徑之特性定義了之後，即不須重複界定，待測天線即可依原來的量測方式進行，利用修正係數來抑制多重路徑的干擾。<br> Abstract: This proposal proposes to investigate the pattern calibration technique to suppress the multipath signals encountered in the measurement of 2-D antenna far-field patterns in a hybrid antenna measurement facility. The techniques can be extended to suppress the multipath signals encountered in the outdoor measurement facility. This technique allows the radiation pattern to be calibrated by using the measured data at a single frequency, instead of using the field data measured at various frequencies or various locations to create diversities. The calibration is based on the use of matrix pencil method (MPM) diagnosis over the multipath characteristics, and results in a calibration factor by using a reference antenna. The advantages are that once the multipath environment has been diagnosed, then they can be stored in the computer. The radiation of AUT is then recovered from the measurement by incorporating this calibration factor without the need to perform multiple measurements over AUT. Both theoretical derivation and examinations will be investigated in this project.天線輻射場型量測多重路徑訊號處理Antenna RadiationPattern MeasurementMulti-path SignalsSignal Process