本文關鍵詞：天線遠場測量系統(tǒng)的分析與研究　出處：《西安電子科技大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： 遠場測量系統(tǒng) 天線測量 誤差分析 對數(shù)周期天線

【摘要】：在遠場天線測量系統(tǒng)中,傳統(tǒng)架設天線的方式,自動化程度低,人工操作流程相當費時,從而造成測量效率低下,所以需要研究新技術設備的高效率測量系統(tǒng)。本文研究的系統(tǒng)是在微波暗室中可實現(xiàn)0.5GHz~40GHz各類型雷達以及雷達對抗裝備天線遠場方向圖、增益等參數(shù)進而實現(xiàn)雷達整機性能的精確測量。自動化天線測量系統(tǒng)通過計算機編程,進而完成對發(fā)射源頻率、輸出功率、工作模式等參數(shù)的設置,同時控制轉(zhuǎn)臺各個軸的轉(zhuǎn)動,發(fā)射源通過發(fā)射天線發(fā)射信號,信號到達接收天線后,由于空間中信號能量的損耗,需要經(jīng)過低聲噪放大器抬高信號功率,通過高頻信號線到達矢網(wǎng)儀,采集信號按時間角度的方式顯示出來。本文還對天線測量的基本方法進行研究。在保證室內(nèi)遠場距離R=35m,在0.5GHz~40GHz情況下,系統(tǒng)使用旋轉(zhuǎn)天線的方法測繪出方向圖,標準天線已標定好增益值,我們在暗室內(nèi)還通過搭建三天線測量系統(tǒng)驗證標準天線的增益,天線安裝高度H為2.6m,收發(fā)天線之間的間距R是12.68m,滿足遠場測量距離,效果良好。隨后使用自動化測量系統(tǒng)中使用比較法測出待測天線的增益,接著對系統(tǒng)所處環(huán)境,各個子系統(tǒng)的組成以及它們各自功能深入的研究,還有軟件功能的具體實現(xiàn)給出了詳細的說明。對自動化遠場測量系統(tǒng)的誤差分析主要是對方向圖和增益的誤差分析。方向圖誤差從測量距離、測量環(huán)境和角度測量三個方面分析,增益誤差從極化失配、阻抗失配、收發(fā)天線間的耦合和相位中心不重合的方面分析,主要是對有限測量距離引入的誤差進行分析,得出了增益相對誤差與天線尺寸、工作頻率以及暗室測量間距的關系變化曲線。本文設計研究了對數(shù)周期偶極子天線,帶寬是0.2GHz~2GHz,使用HFSS13.0建模,對模型進行仿真分析計算,得出增益和方向圖,與在測量系統(tǒng)中實際測量值進行對比分析,結(jié)果符合預期的設想。
[Abstract]:In the far-field antenna measurement system, the traditional way of setting up antenna is of low degree of automation, and the manual operation process is time-consuming, which results in low efficiency of measurement. Therefore, it is necessary to study the high efficiency measurement system of the new technology and equipment. The system studied in this paper can realize 0.5 GHz ~ 40GHz radar and radar countermeasure equipment antenna far-field pattern in the microwave darkroom. The automatic antenna measurement system is programmed by computer to set the parameters such as source frequency, output power, working mode and so on. At the same time, the rotation of each axis of the turntable is controlled. The transmitter transmits signals by transmitting antennas. After the signal reaches the receiving antenna, because of the loss of the signal energy in the space, the signal power needs to be raised by a low noise amplifier. Through the high-frequency signal line to reach the vector network, the collected signal is displayed in the way of time angle. The basic method of antenna measurement is also studied in this paper, and the indoor far field distance is guaranteed to be 35 m. In the case of 0.5GHz or 40GHz, the system uses the method of rotating antenna to draw the pattern, and the gain value of the standard antenna has been calibrated. The gain of the standard antenna is verified by building a three-antenna measurement system in the darkroom. The antenna installation height H is 2.6 m and the distance between the receiving and transmitting antennas R is 12.68 m, which meets the distance of far field measurement. The result is good. Then the gain of antenna to be tested is measured by comparison method in the automatic measurement system. Then the environment of the system, the composition of each subsystem and their respective functions are deeply studied. The error analysis of the automatic far field measurement system is mainly the error analysis of the direction diagram and the gain. The pattern error is measured from the distance. The gain error is analyzed from the aspects of polarization mismatch, impedance mismatch, coupling between transceiver antennas and non-coincidence of phase center. The error caused by the limited measurement distance is analyzed, and the relative gain error and antenna size are obtained. In this paper, the logarithmic periodic dipole antenna is designed and studied. The bandwidth is 0.2GHz and 2GHz. HFSS13.0 is used to model the antenna. The model is simulated and calculated, and the gain and pattern are obtained. The results are compared with the actual measured values in the measurement system. The results are in line with the expected assumption.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN820

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相關期刊論文 前1條

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本文編號：1439820