【摘要】：GNSS在軍事上的廣泛應(yīng)用導(dǎo)致了愈演愈烈的“導(dǎo)航戰(zhàn)”。匹配譜干擾作為一種有效的寬帶干擾類型,已得到干擾實(shí)施方的廣泛使用。通過(guò)干擾的來(lái)波方向(DOA)估計(jì),一方面可以定位干擾源從而采取相關(guān)措施,另一方面也可以通過(guò)相關(guān)算法在干擾方向上形成零陷從而達(dá)到抑制干擾的目的。隨著陣列信號(hào)處理技術(shù)的不斷發(fā)展,目前關(guān)于窄帶信號(hào)的高分辨DOA估計(jì)算法已經(jīng)比較成熟,國(guó)內(nèi)外學(xué)者將研究的重點(diǎn)轉(zhuǎn)向了寬帶信號(hào)的DOA估計(jì)算法上。目前,針對(duì)寬帶信號(hào)的DOA估計(jì)算法的運(yùn)算量都比較大,復(fù)雜度也比較高,而且可估計(jì)干擾源數(shù)目受限于陣列的自由度�；诖吮尘�,本文對(duì)GNSS匹配譜干擾的來(lái)波方向估計(jì)算法進(jìn)行了如下研究。首先提出了單個(gè)匹配譜干擾的來(lái)波方向估計(jì)算法。在分析GNSS匹配譜干擾特性的基礎(chǔ)上,提出了平方聚焦的思想,將匹配譜干擾來(lái)波方向估計(jì)問(wèn)題轉(zhuǎn)變成單頻干擾的來(lái)波方向估計(jì)問(wèn)題。論文從算法的實(shí)現(xiàn)復(fù)雜度、有效性、估計(jì)性能等方面進(jìn)行了分析比較和仿真,結(jié)果表明新算法在減小運(yùn)算量的前提下實(shí)現(xiàn)了來(lái)波方向的高精度估計(jì)。其次對(duì)基于高階IIR陷波器的多信號(hào)分離算法進(jìn)行了研究。在分析二階IIR陷波器性能的基礎(chǔ)上,采用級(jí)聯(lián)的形式擴(kuò)展研究了高階IIR陷波器的性能,并利用其能抑制多個(gè)單頻干擾的特點(diǎn)提出了多信號(hào)分離算法。該算法的提出為多個(gè)匹配譜干擾的來(lái)波方向估計(jì)算法的研究提供了前提基礎(chǔ)。本文最后在前述兩個(gè)算法研究的基礎(chǔ)上研究了多個(gè)匹配譜干擾的來(lái)波方向估計(jì)算法。通過(guò)平方聚焦的方法,使得N個(gè)匹配譜干擾變成N個(gè)單頻干擾。然后基于多信號(hào)分離算法,依次用高階IIR陷波器抑制其中N-1個(gè)單頻干擾,只保留一個(gè)單頻干擾,從而將多個(gè)匹配譜干擾來(lái)波方向估計(jì)問(wèn)題轉(zhuǎn)變成為了單個(gè)單頻干擾來(lái)波方向估計(jì)的問(wèn)題。理論分析和仿真實(shí)驗(yàn)結(jié)果表明,新算法相對(duì)于傳統(tǒng)算法具有明顯優(yōu)勢(shì):結(jié)構(gòu)更加簡(jiǎn)單、運(yùn)算量相對(duì)減小以及可估計(jì)干擾源數(shù)目不再受限于陣列的自由度等。本文上述的研究成果為GNSS匹配譜干擾的來(lái)波方向估計(jì)問(wèn)題提供了一種新穎的解決方案。
[Abstract]:The widespread use of GNSS in the military has led to a growing "navigation war". As an effective type of wideband interference, matched spectral interference has been widely used by interference operators. Based on the (DOA) estimation of the interference direction, the interference source can be located and relevant measures can be taken on the other hand, the interference can be suppressed by forming zero trapping in the interference direction by the correlation algorithm. With the development of array signal processing technology, the high-resolution DOA estimation algorithms for narrowband signals have been mature. The research focus of domestic and foreign scholars has shifted to the wideband signal DOA estimation algorithm. At present, the DOA estimation algorithms for wideband signals have large computational complexity and high complexity, and the number of interference sources is limited by the degree of freedom of the array. Based on this background, the direction estimation algorithm of GNSS matched spectral interference is studied as follows. First, an algorithm for direction estimation of single matched spectral interference is proposed. Based on the analysis of the characteristics of GNSS matching spectral interference, the idea of square focusing is proposed, which transforms the direction estimation of matched spectral interference into that of single frequency interference. In this paper, the complexity, efficiency and performance of the algorithm are compared and simulated. The results show that the new algorithm can estimate the direction of the wave with high accuracy while reducing the computational complexity. Secondly, the multi-signal separation algorithm based on high-order IIR notch is studied. Based on the analysis of the performance of the second-order IIR notch, the performance of the high-order IIR notch is studied by cascaded expansion, and a multi-signal separation algorithm is proposed based on its ability to suppress multiple single-frequency interference. The proposed algorithm provides a prerequisite for the research of multiple matching spectral interference estimation algorithms. In the end, based on the above two algorithms, the direction estimation algorithms for multiple matched spectral disturbances are studied. By square focusing method, N matched spectral interference is changed into N single frequency interference. Then, based on the multi-signal separation algorithm, a high-order IIR notch is used to suppress N-1 single-frequency interference, and only one single-frequency interference is retained. Thus, the direction estimation problem of multiple matched spectral disturbances is transformed into the direction estimation problem of single frequency interference. The theoretical analysis and simulation results show that the new algorithm has obvious advantages over the traditional algorithms, such as simpler structure, less computation and the fact that the estimated number of interference sources is no longer limited by the degree of freedom of the array. The results of this paper provide a novel solution for the direction estimation of GNSS matched spectral interference.
【學(xué)位授予單位】：國(guó)防科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN967.1;TN911.23

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