本文選題：全球定位系統(tǒng)(GPS) + 多級維納濾波(MWF)��； 參考：《國防科學(xué)技術(shù)大學(xué)》2014年博士論文

【摘要】：導(dǎo)航系統(tǒng)正用于戰(zhàn)場各種武器平臺及飛行器,但容易受到干擾。因此導(dǎo)航信號抗干擾當(dāng)前受到嚴(yán)重關(guān)注,是在理論、實現(xiàn)算法及技術(shù)等方面需要深入研究的課題。本文結(jié)合兩個科研項目:一、航天部某研究所的委托的“GPS/GLONASS/北斗I三�？垢蓴_中頻模塊設(shè)計”;二、通信抗干擾技術(shù)國家級重點實驗室基金項目“空時頻多維DOA估計與方向約束抗干擾濾波技術(shù)研究”。這兩個課題都與全球定位系統(tǒng)(GPS:Globe Positioning System)抗干擾技術(shù)密切相關(guān)�？諘r自適應(yīng)處理(STAP:Space-Time Adaptive Processing)有較大的抗干擾自由度,是應(yīng)對干擾環(huán)境的一種有效方法。為避開矩陣特征分解,可采用正交投影方法實現(xiàn)STAP。正交投影類算法都存在一個問題,即存在一個最佳的投影次數(shù),超過之后會使信干噪比下降,這在實際中更明顯。針對這一問題,提出兩種解決方法。一、將對角加載引入典型的正交投影算法多級維納濾波中,提高了算法的魯棒性,使其在實際環(huán)境中獲得穩(wěn)定的抗干擾性能。二、運用多級維納濾波器對觀測數(shù)據(jù)矢量進(jìn)行分析,估計出最佳投影次數(shù),從而獲得最優(yōu)抗干擾效果。為使導(dǎo)航信號平臺在多干擾環(huán)境下仍能正常工作,需在陣元數(shù)有限情況下,發(fā)揮現(xiàn)有接收天線的最大效能。對此采用級聯(lián)方法處理,在復(fù)雜信號接收環(huán)境下檢測并消除窄帶干擾,然后用自適應(yīng)陣消除其余干擾。在接收信號中含有多種干擾時,頻譜較為復(fù)雜,難以采用一般處理窄帶干擾的方法。為解決這一問題,采用了一種滑窗式的頻譜處理法,可以在較復(fù)雜的頻譜中有效檢測出單頻和窄帶干擾。在空域處理中,提出一種成對變換的Jacobi迭代運算方法,可削減協(xié)方差矩陣特征分解的運算量。戰(zhàn)場環(huán)境下,非平穩(wěn)干擾以及載體高速運動對抗干擾性能影響較大,有必要研究有效解決方法。線性掃頻(LFM:Linear Frequency Modulation)干擾是典型的非平穩(wěn)干擾�？砂慈缦路绞教幚�:通過時頻分析提取干擾信號參數(shù),據(jù)此構(gòu)建干擾子空間,用子空間投影的方法即可消除干擾。本文提出一種LFM干擾參數(shù)估計方法,相對于傳統(tǒng)的Weigner-Hough變換,可以極大的減小運算量。文中分析了子空間投影處理中參數(shù)估計誤差對于抗干擾性能的影響,給出相應(yīng)解決方法。一般性非平穩(wěn)干擾可用自適應(yīng)陣對消,文中4.2節(jié)研究了該類干擾的波達(dá)方向估計,但將處理過程放在4.3節(jié)與平穩(wěn)干擾一起討論。這是因為,如用自適應(yīng)陣處理,非平穩(wěn)和平穩(wěn)干擾可采用同樣的處理方式。因此沒必要在第4.2節(jié)單獨討論非平穩(wěn)信號的對消。在時頻分布的優(yōu)化處理中,推導(dǎo)出自源點與互源點對應(yīng)矩陣的跡的表達(dá)式,根據(jù)表達(dá)式可以清楚選出自源點。由于載體高速運動以及自身高頻振動,干擾入射角在處理時段內(nèi)有變動,可能使抗干擾性能下降很大,因此有必要研究應(yīng)對方法�？煞指蓴_方向已知和未知兩種情況討論。當(dāng)干擾方向已知時,可用傳統(tǒng)方法解決上述問題。對于干擾方向未知的情況,本文提出一種方法,在最優(yōu)化表述中使用適合于實際情況的約束條件,據(jù)此推導(dǎo)出具備零陷擴(kuò)展功能的自適應(yīng)權(quán)值,可以有效應(yīng)對載體動態(tài)帶來的干擾入射角偏移。在GPS抗干擾的理論研究和系統(tǒng)設(shè)計中存在一個突出問題:仿真條件隨意設(shè)置,沒有反映真實信號接收環(huán)境。為解決這一問題,分別在仿真和設(shè)計環(huán)境中模擬了陣列天線上接收到的GPS信號,產(chǎn)生了貼近于真實的仿真和測試平臺。之后在同一章描述了抗干擾系統(tǒng)的設(shè)計,可以用于三種導(dǎo)航信號的抗干擾。借助模擬產(chǎn)生的接收信號對抗干擾系統(tǒng)進(jìn)行測試,可以更方便地改進(jìn)設(shè)計。設(shè)計完成后進(jìn)行了實測,過程測試和最終的定位結(jié)果檢驗了所設(shè)計的系統(tǒng)。
[Abstract]:Navigation system is used on the battlefield weapons platform and aircraft, but susceptible to interference. So the navigation signal interference current is a serious concern, in theory, algorithm and technology aspects need further research topic. This article combines two research projects: first, a Research Institute commissioned by the Department of space "GPS/GLONASS/ Beidou I three die The design of anti-jamming medium frequency module "; two, the National Key Laboratory of Communication Anti-jamming Technology, the research on space-time multidimensional DOA estimation and directional constraint anti-jamming filtering technology". These two topics are closely related to the global positioning system (GPS:Globe Positioning System) anti-jamming technique. Space time adaptive processing (STAP:Space-Time Adaptive Processing is an effective method to deal with the interference environment. In order to avoid the matrix characteristic decomposition, there is a problem that the orthogonal projection method can be used to realize the STAP. orthogonal projection algorithm, that is, there is a best number of projection, which will reduce the signal to noise ratio after over, which is more obvious in practice. In order to solve this problem, two solutions are proposed. First, the diagonal loading is introduced into the typical orthogonal projection algorithm multilevel Wiener filtering to improve the robustness of the algorithm and make it obtain stable anti-interference performance in the actual environment. Two, the observation data vector is analyzed with multistage Wiener filter, and the best projection times are estimated. In order to get the best anti-interference effect, in order to make the navigation signal platform working in the multi interference environment, it is necessary to play the maximum efficiency of the existing receiving antenna under the limited array element number. The cascade method is used to detect and eliminate the narrow band interference in the complex signal receiving environment, and then the rest interference is eliminated by the adaptive array. In order to solve this problem, a sliding form spectrum processing method is adopted to effectively detect single frequency and narrow band interference in more complex spectrum. In the space processing, a kind of Jacobi iterative transport is proposed. The calculation method can reduce the computation of the eigendecomposition of covariance matrix. Under the battlefield environment, the non stationary interference and the high speed motion of the carrier have great influence on the interference performance. It is necessary to study the effective solution. The LFM:Linear Frequency Modulation interference is a typical non-stationary interference. The interference signal parameters are extracted and the interference subspace is constructed, and the interference can be eliminated by subspace projection. A LFM interference parameter estimation method is proposed in this paper. Compared with the traditional Weigner-Hough transform, the calculation amount can be greatly reduced. The parameter estimation error in subspace projection processing is analyzed for the anti-interference performance. The general non-stationary interference can be eliminated by adaptive array. The 4.2 section of the paper studies the direction of arrival of this kind of interference, but the processing is discussed in the 4.3 section with stationary interference. This is because, for example, the same processing method can be used for non stationary and stationary interference with adaptive array processing. Therefore, it is not necessary. In Section 4.2, we should discuss the cancellation of non-stationary signal separately. In the optimization of the time frequency distribution, the expression of the trace of the corresponding matrix between the source and the mutual source point is derived, and the self source point can be clearly selected according to the expression. The interference angle is changed during the processing period because of the high speed motion of the carrier and the high frequency vibration of the self. There is a great decrease in disturbance performance. Therefore, it is necessary to study the coping methods. Two cases with known and unknown interference directions are discussed. When the interference direction is known, the traditional method can be used to solve the above problems. For the unknown interference direction, a method is proposed in this paper to use the constraints suitable for the actual situation in the optimization expression. An adaptive weight with zero sink extension function is derived, which can effectively cope with the interference incident angle offset caused by the carrier dynamic. There is a prominent problem in the theoretical research and system design of GPS anti-jamming: the simulation conditions are set at will, and the real signal receiving environment is not reflected. In order to solve this problem, the simulation and design ring are solved respectively. In the environment, the GPS signals received on the array antenna are simulated, and the simulation and testing platform which is close to the reality is produced. After that, the design of the anti-jamming system is described in the same chapter, which can be used for the anti-interference of the three kinds of navigation signals. After the completion of the measurement, the process test and the final positioning result verify the designed system.

【學(xué)位授予單位】：國防科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：P228.4

【相似文獻(xiàn)】

相關(guān)期刊論文 前3條

1 李明東;;閉路電視監(jiān)控系統(tǒng)的抗干擾方法[J];科技信息(學(xué)術(shù)研究);2008年28期

2 祖彥勇;馬紅梅;;電子電路接地與抗干擾[J];科技信息;2009年07期

3 ;[J];;年期

相關(guān)會議論文 前3條

1 李長龍;;自控系統(tǒng)抗干擾與接地[A];中國計量協(xié)會冶金分會2009年年會論文集[C];2009年

2 鄧志鑫;范廣偉;楊鵬;;基于權(quán)值迭代的GNSS終端最優(yōu)抗干擾算法研究[A];第三屆中國衛(wèi)星導(dǎo)航學(xué)術(shù)年會電子文集——S07北斗/GNSS用戶終端技術(shù)[C];2012年

3 李琳;楊生;譚述森;;北斗用戶機(jī)抗干擾低暴露技術(shù)研究[A];第一屆中國衛(wèi)星導(dǎo)航學(xué)術(shù)年會論文集（上）[C];2010年

相關(guān)重要報紙文章 前1條

1 八戒;無線干擾與抗干擾的對弈[N];電腦報;2012年

相關(guān)博士學(xué)位論文 前2條

1 周柱;GPS接收機(jī)抗干擾研究[D];國防科學(xué)技術(shù)大學(xué);2014年

2 郭藝;GPS接收機(jī)空時抗干擾理論與實現(xiàn)關(guān)鍵技術(shù)研究[D];國防科學(xué)技術(shù)大學(xué);2007年

相關(guān)碩士學(xué)位論文 前5條

1 袁上策;北斗導(dǎo)航抗干擾算法研究及實現(xiàn)[D];電子科技大學(xué);2015年

2 王云爽;空時極化抗干擾算法研究[D];西安電子科技大學(xué);2014年

3 于瑩瑩;空時聯(lián)合自適應(yīng)天線抗干擾的研究[D];哈爾濱工程大學(xué);2012年

4 權(quán)友波;衛(wèi)星導(dǎo)航接收機(jī)時頻抗干擾算法[D];電子科技大學(xué);2009年

5 符林強;基于陣列的GPS抗干擾算法及性能評估[D];電子科技大學(xué);2011年

，

本文編號：1886962