發(fā)布時間：2018-08-20 10:35

【摘要】：北斗衛(wèi)星導航系統(tǒng)是我國自主研制、獨立運行的全球衛(wèi)星導航系統(tǒng)。隨著北斗衛(wèi)星導航系統(tǒng)越來越多地廣泛應用,人們對導航系統(tǒng)的精確性和可靠性有了更高的要求,尤其是在北斗導航系統(tǒng)最為廣泛應用的戰(zhàn)場環(huán)境中,各種各樣的干擾變幻莫測。為了使得北斗導航接收機在復雜的干擾環(huán)境下仍能正常高效工作,必須提高導航接收系統(tǒng)的干擾抑制性能。由于目前采用的空域抗干擾方案有自由度受限于陣元個數(shù)的缺陷,不能對大量寬帶干擾進行有效抑制,論文對空時聯(lián)合干擾抑制算法進行了相關(guān)研究。該算法在空域濾波的基礎(chǔ)上,在每個陣元上增加相同數(shù)目的時間抽頭,從而增加可處理的干擾數(shù)目,提高抗干擾性能。論文首先對衛(wèi)星導航接收機的常見干擾信號進行了分析;接著對典型的抗干擾算法進行了研究,主要包括:時域、頻域、空域干擾抑制算法,針對這些算法抗干擾性能的局限性,著重研究了空時聯(lián)合干擾抑制算法;隨后論文介紹了空時自適應的幾種典型算法,在對比分析之后,論文選擇采用最小均方誤差(LMS)算法進行研究;由于傳統(tǒng)LMS算法的步長因子固定,影響算法的收斂速度和穩(wěn)態(tài)誤差,針對這一缺陷,通過歸一化LMS算法來處理步長因子,經(jīng)過仿真比較,歸一化LMS算法性能較優(yōu);最后將歸一化LMS算法應用于空時自適應干擾抑制算法的實現(xiàn)。論文基于Matlab仿真,構(gòu)建了空時自適應干擾抑制算法的仿真模型,設(shè)置仿真參數(shù),把采集到的衛(wèi)星信號和干擾機產(chǎn)生的干擾共同作為輸入信號,經(jīng)過各個模塊的處理后,得到輸出信號。通過對比輸入和輸出信號并計算相消比,得出空時自適應干擾抑制算法能夠更有效地抑制寬帶干擾的結(jié)論。最后對實驗中抗干擾性能的影響因素進行了仿真分析。
[Abstract]:Beidou satellite navigation system is a global satellite navigation system independently developed and operated by our country. With the more and more extensive application of Beidou satellite navigation system, people have higher requirements for the accuracy and reliability of the navigation system, especially in the battlefield environment where Beidou navigation system is most widely used. All kinds of interference are unpredictable. In order to make the Beidou navigation receiver work normally and efficiently in complex jamming environment, the interference suppression performance of the navigation receiver must be improved. Due to the limitation of degree of freedom to the number of array elements, the existing spatial anti-jamming scheme can not effectively suppress a large number of wideband interference. In this paper, the space-time joint interference suppression algorithm is studied. On the basis of spatial filtering, the algorithm adds the same number of time taps to each array element, thus increasing the number of interferences that can be processed and improving the performance of anti-jamming. Firstly, the common interference signals of satellite navigation receiver are analyzed, and then the typical anti-jamming algorithms are studied, including: time domain, frequency domain, spatial domain interference suppression algorithm. In view of the limitation of anti-jamming performance of these algorithms, the joint space-time interference suppression algorithm is studied emphatically, and then several typical space-time adaptive algorithms are introduced. In this paper, the minimum mean square error (LMS) algorithm is chosen to study. Because of the fixed step size factor of the traditional LMS algorithm, the convergence speed and steady-state error of the algorithm are affected. Aiming at this defect, the normalized LMS algorithm is used to deal with the step factor. The performance of normalized LMS algorithm is better than that of other algorithms. Finally, the normalized LMS algorithm is applied to the implementation of space-time adaptive interference suppression algorithm. Based on Matlab simulation, the simulation model of space-time adaptive interference suppression algorithm is constructed, and the simulation parameters are set up. The acquired satellite signal and the jamming generated by the jammer are taken as input signals, and processed by each module. Get the output signal. By comparing the input and output signals and calculating the cancellation ratio, it is concluded that the space-time adaptive interference suppression algorithm can suppress wideband interference more effectively. Finally, the influence factors of anti-interference performance in the experiment are simulated and analyzed.
【學位授予單位】：南京郵電大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN965.5

【參考文獻】

相關(guān)期刊論文 前10條

1 馬天明;;北斗導航與GPS定位技術(shù)在航海定位中的對比分析[J];黑龍江科學;2016年12期

2 周兵;;北斗衛(wèi)星導航系統(tǒng)發(fā)展現(xiàn)狀與建設(shè)構(gòu)想[J];無線電工程;2016年04期

3 農(nóng)肖肖;;基于北斗衛(wèi)星導航系統(tǒng)的野外地質(zhì)調(diào)查應急救援系統(tǒng)的設(shè)計與實現(xiàn)[J];地礦測繪;2015年04期

4 姚銳;;北斗接收機空時聯(lián)合抗干擾算法研究[J];電子科技;2015年01期

5 羅顯志;范廣偉;;基于多天線的欺騙式干擾檢測技術(shù)研究[J];高技術(shù)通訊;2015年01期

6 王儷霏;李博峰;張興福;;北斗與GPS隨機模型對比分析[J];測繪工程;2014年10期

7 李克昭;韓夢澤;孟福軍;;北斗系統(tǒng)的特色、機遇與挑戰(zhàn)[J];導航定位學報;2014年02期

8 王曉君;張偉;杜萌萌;;北斗衛(wèi)星導航系統(tǒng)的應用及其抗干擾技術(shù)[J];河北工業(yè)科技;2014年03期

9 于淵;雷利軍;景澤濤;王振華;王文良;;北斗衛(wèi)星導航在國內(nèi)智能交通等領(lǐng)域的應用分析[J];工程研究-跨學科視野中的工程;2014年01期

10 何永前;;北斗衛(wèi)星導航系統(tǒng)抗干擾技術(shù)研究與實現(xiàn)[J];艦船電子工程;2014年01期

相關(guān)博士學位論文 前9條

1 熊竹林;抗干擾衛(wèi)星導航接收機關(guān)鍵技術(shù)研究[D];北京理工大學;2016年

2 周巍;北斗衛(wèi)星導航系統(tǒng)精密定位理論方法研究與實現(xiàn)[D];解放軍信息工程大學;2013年

3 盧丹;穩(wěn)健的全球衛(wèi)星導航系統(tǒng)抗干擾技術(shù)研究[D];西安電子科技大學;2013年

4 崔s，

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