本文選題：合成孔徑雷達 + LFM-PC信號��； 參考：《南京航空航天大學》2017年碩士論文

【摘要】：合成孔徑雷達(SAR)是一種主動式微波遙感系統(tǒng),與光學成像相比,由于其不受光照和氣候條件的影響,能實現(xiàn)全天時、全天候工作,因此在民用和軍用領(lǐng)域都有廣泛應用。欺騙式干擾通過較小的干擾功率就可以在SAR圖像上生成虛假目標,是當前干擾技術(shù)中的研究重點。針對欺騙式SAR干擾,目前的抗干擾技術(shù)主要包括脈間信號參數(shù)捷變、脈間波形捷變等。常用雷達信號中,線性調(diào)頻(LFM)信號自相關(guān)性能差,信號形式簡單,易被干擾機識別,抗干擾性能差;相位編碼信號和混沌類信號有很好的抗干擾性能,但是對多普勒敏感�；谏鲜霰尘�,本文的主要研究內(nèi)容如下:(1)利用相位編碼信號調(diào)制LFM信號,得到了一種新的復合調(diào)制信號——LFM-PC信號。分析了該信號的距離向分辨率、多普勒容限和正交性。針對該信號對多普勒敏感的問題,采用序列二次規(guī)劃(SQP)法優(yōu)化模糊函數(shù),增大其多普勒容限。討論了基于LFM-PC信號和極坐標格式算法的SAR成像方法的可行性。(2)針對欺騙式SAR干擾,提出了一種基于正交LFM-PC波形捷變的抗干擾方法。通過在不同方位時刻發(fā)射相互正交的LFM-PC信號,使得干擾信號無法獲得距離向脈壓增益�；跇O小化峰值旁瓣能量準則建立優(yōu)化模型,采用SQP法設(shè)計正交LFM-PC波形。仿真驗證了優(yōu)化后的LFM-PC信號具有良好的正交性,且該方法取得了良好的抗干擾性能。(3)針對欺騙式SAR干擾,提出了一種方位向疊加自適應初相的抗干擾方法。采用共軛梯度法設(shè)計自適應初相,極小化待優(yōu)化區(qū)域的方位向干擾幅度。針對上述方法在干擾幅度過大時造成的真實目標信息被壓制的問題,提出了正交LFM-PC波形捷變和自適應初相結(jié)合的復合抗干擾方法,首先通過正交LFM-PC波形捷變使得干擾信號無法獲得距離向脈壓增益,再設(shè)計自適應初相極小化待優(yōu)化區(qū)域的覆蓋噪聲干擾幅度。仿真驗證了該方法具有良好的抗干擾性能。
[Abstract]:Synthetic Aperture Radar (SAR) is an active microwave remote sensing system. Compared with optical imaging, synthetic Aperture Radar (SAR) is widely used in civil and military fields because it is not affected by light and weather conditions and can work all day and all weather. Deceptive jamming can generate false targets on SAR images through small jamming power, which is the focus of current jamming technology. The current anti-jamming techniques for deceptive SAR jamming mainly include inter-pulse signal parameter agility, inter-pulse waveform agility and so on. Among the common radar signals, the linear frequency modulation (LFM) signal has poor autocorrelation performance, simple signal form, easy to be recognized by jammer, and poor anti-jamming performance. The phase coded signal and chaotic signal have good anti-jamming performance, but they are sensitive to Doppler. Based on the above background, the main contents of this paper are as follows: (1) A new composite modulation signal, LFM-PC signal, is obtained by modulating LFM signal with phase-coded signal. The range resolution, Doppler tolerance and orthogonality of the signal are analyzed. To solve the problem that the signal is sensitive to Doppler, the sequential quadratic programming (sqp) method is used to optimize the ambiguity function to increase its Doppler tolerance. The feasibility of SAR imaging method based on LFM-PC signal and polar format algorithm is discussed. (2) an anti-jamming method based on orthogonal LFM-PC waveform agility is proposed for deceptive SAR jamming. By transmitting orthogonal LFM-PC signals at different azimuth times, the interference signal can not obtain the range pulse compression gain. The optimization model is established based on the minimized peak sidelobe energy criterion and the orthogonal LFM-PC waveform is designed by sqp method. Simulation results show that the optimized LFM-PC signal has good orthogonality and good anti-jamming performance. (3) for deceptive SAR jamming, a new anti-jamming method based on azimuth superposition adaptive initial phase is proposed. The conjugate gradient method is used to design the adaptive initial phase to minimize the azimuth interference amplitude of the region to be optimized. In view of the problem that the real target information caused by the above methods is suppressed when the jamming amplitude is too large, a composite anti-jamming method combining orthogonal LFM-PC waveform agility and adaptive initial interference is proposed. First, the interference signal is unable to obtain the range pulse compression gain by orthogonal LFM-PC waveform agility, and then the adaptive initial phase minimization is designed to minimize the coverage noise interference amplitude of the region to be optimized. The simulation results show that the method has good anti-interference performance.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN957.51

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