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  本文選題：寬帶寬角掃描 + Vivaldi天線　； 參考：《電子科技大學(xué)》2016年碩士論文

【摘要】：相控陣雷達廣泛應(yīng)用于制導(dǎo)、探測、識別、跟蹤等領(lǐng)域,寬帶相控陣雷達能實現(xiàn)多目標分辨和高精度測距等,且具備低截獲率和低可探性等優(yōu)勢;寬角掃描相控陣雷達能夠在較大的空域內(nèi)發(fā)現(xiàn)目標,及時預(yù)警來自某些盲區(qū)的致命打擊;共形技術(shù)是實現(xiàn)相控陣雷達大角度掃描的一種有效手段。本文圍繞著寬帶寬角掃描共形相控陣技術(shù)展開研究,主要內(nèi)容如下:首先,針對寬帶寬角掃描陣列對陣元的要求,設(shè)計出一種微帶形式的小型化寬帶寬波束Vivaldi天線,并對金屬表面進行切角處理,使得改進型Vivaldi天線的波束寬度進一步展寬。針對Vivaldi天線又提出了三種在寬頻帶內(nèi)有效展寬波束寬度的天線形式,設(shè)計的寬帶寬波束單元天線適用于寬帶寬角掃描陣列中。其次,針對寬帶寬角掃描平面陣列在掃描過程中出現(xiàn)柵瓣和掃描盲點的現(xiàn)象,分別采用三角柵格的布陣方式和在輻射口徑上方添加兩層薄介質(zhì)匹配層的方法,有效解決了掃描柵瓣和盲點的問題。設(shè)計了一種寬帶寬角掃描平面相控陣天線,在8~18GHz頻帶內(nèi)可實現(xiàn)±45度的空域掃描范圍,4dB增益損耗內(nèi)掃描范圍可達到±60度。再次,針對寬帶寬角掃描共形陣列的設(shè)計問題,給出了口徑幅相投影法的綜合步驟,采用廣義有源矢量方向圖進行綜合,提高了共形陣列綜合的準確性,同時考慮到共形載體的遮擋效應(yīng),對部分陣元失效處理,降低了方向圖遠區(qū)副瓣。設(shè)計了一種寬帶寬角掃描圓柱面周向共形的陣列天線,在8~18GHz頻帶內(nèi)可實現(xiàn)±75度的空域掃描范圍。最后,針對圓柱面軸向共形陣列方向圖的綜合問題,給出了一種改進的自適應(yīng)遺傳算法。該算法通過引入基因多樣性的概念,增加了進化過程中種群的多樣性,改善早熟現(xiàn)象。采用改進的遺傳算法對圓柱共形陣列軸向掃描方向圖進行綜合,在實現(xiàn)寬帶寬角掃描的同時,可有效降低方向圖遠區(qū)副瓣。
[Abstract]:Phased array radar is widely used in guidance, detection, identification, tracking and other fields. Wideband phased array radar can achieve multi-target resolution and high-precision ranging, and has the advantages of low interception rate and low detectability. The wide-angle scanning phased array radar can find the target in a large airspace and warn the fatal strike from some blind areas in time. Conformal technology is an effective means to realize the large angle scanning of phased array radar. This paper focuses on the broadband wide-angle scanning conformal phased array technology. The main contents are as follows: firstly, a miniaturized wideband wide-beam Vivaldi antenna in microstrip form is designed to meet the requirements of wideband wide-angle scanning array. The beamwidth of the improved Vivaldi antenna is further broadened by cutting angle on the metal surface. For the Vivaldi antenna, three kinds of antenna forms which can effectively widen the beam width in a wide band are proposed. The designed broadband wide-beam cell antenna is suitable for wideband wide-angle scanning array. Secondly, aiming at the phenomenon of grid lobe and blind spot in the scanning process of wide-angle scanning plane array, the triangular grid array and the method of adding two layers of thin media matching layer above the radiation aperture are adopted, respectively. The problem of scan gate lobe and blind spot is solved effectively. A wideband wide-angle scanning planar phased array antenna is designed. The spatial scanning range of 鹵45 degrees can be achieved in the 8~18GHz band, and the gain loss internal scanning range can reach 鹵60 degrees. Thirdly, aiming at the design of wide-band wide-angle scanning conformal array, the synthetic steps of aperture amplitude-phase projection method are given. The generalized active vector pattern is used to synthesize the conformal array, and the accuracy of conformal array synthesis is improved. Considering the occlusion effect of conformal carrier, partial array element failure treatment is taken into account and the distal sidelobe is reduced. A wide-band wide-angle scanning cylindrical circumferential conformal array antenna is designed. The scanning range of 鹵75 degrees can be realized in the 8~18GHz band. Finally, an improved adaptive genetic algorithm is proposed for the synthesis of cylindrical axial conformal array patterns. By introducing the concept of genetic diversity, the algorithm increases the diversity of population and improves the phenomenon of precocity. The improved genetic algorithm is used to synthesize the axial scanning pattern of the cylindrical conformal array, which can effectively reduce the far sidelobe of the pattern while the wide angle scanning is realized.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TN820

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本文編號：1898998