發(fā)布時(shí)間：2018-08-20 10:35

【摘要】：北斗衛(wèi)星導(dǎo)航系統(tǒng)是我國(guó)自主研制、獨(dú)立運(yùn)行的全球衛(wèi)星導(dǎo)航系統(tǒng)。隨著北斗衛(wèi)星導(dǎo)航系統(tǒng)越來越多地廣泛應(yīng)用,人們對(duì)導(dǎo)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(dǎo)航系統(tǒng)最為廣泛應(yīng)用的戰(zhàn)場(chǎng)環(huán)境中,各種各樣的干擾變幻莫測(cè)。為了使得北斗導(dǎo)航接收機(jī)在復(fù)雜的干擾環(huán)境下仍能正常高效工作,必須提高導(dǎo)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(gè)數(shù)的缺陷,不能對(duì)大量寬帶干擾進(jìn)行有效抑制,論文對(duì)空時(shí)聯(lián)合干擾抑制算法進(jìn)行了相關(guān)研究。該算法在空域?yàn)V波的基礎(chǔ)上,在每個(gè)陣元上增加相同數(shù)目的時(shí)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(duì)衛(wèi)星導(dǎo)航接收機(jī)的常見干擾信號(hào)進(jìn)行了分析;接著對(duì)典型的抗干擾算法進(jìn)行了研究,主要包括:時(shí)域、頻域、空域干擾抑制算法,針對(duì)這些算法抗干擾性能的局限性,著重研究了空時(shí)聯(lián)合干擾抑制算法;隨后論文介紹了空時(shí)自適應(yīng)的幾種典型算法,在對(duì)比分析之后,論文選擇采用最小均方誤差(LMS)算法進(jìn)行研究;由于傳統(tǒng)LMS算法的步長(zhǎng)因子固定,影響算法的收斂速度和穩(wěn)態(tài)誤差,針對(duì)這一缺陷,通過歸一化LMS算法來處理步長(zhǎng)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(yīng)用于空時(shí)自適應(yīng)干擾抑制算法的實(shí)現(xiàn)。論文基于Matlab仿真,構(gòu)建了空時(shí)自適應(yīng)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(hào)和干擾機(jī)產(chǎn)生的干擾共同作為輸入信號(hào),經(jīng)過各個(gè)模塊的處理后,得到輸出信號(hào)。通過對(duì)比輸入和輸出信號(hào)并計(jì)算相消比,得出空時(shí)自適應(yīng)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(duì)實(shí)驗(yàn)中抗干擾性能的影響因素進(jìn)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(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN965.5

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