本文關(guān)鍵詞： LFM脈沖 數(shù)字射頻存儲(chǔ)器 抗轉(zhuǎn)發(fā)式欺騙干擾 stretch 相位量化 脈間調(diào)相　出處：《南京理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：采用數(shù)字射頻存儲(chǔ)器(DRFM)技術(shù)的轉(zhuǎn)發(fā)式干擾能夠獲得高相干信號(hào)處理增益,成為線性調(diào)頻脈沖(LFM)雷達(dá)干擾對(duì)抗模塊中亟待解決的難題,本文以LFM雷達(dá)對(duì)抗轉(zhuǎn)發(fā)式干擾為應(yīng)用背景,開(kāi)展轉(zhuǎn)發(fā)式干擾對(duì)抗方法研究與實(shí)現(xiàn)。本文主要工作如下:1.構(gòu)建了 LFM脈沖雷達(dá)的接收信號(hào)和轉(zhuǎn)發(fā)式距離欺騙干擾的模型,設(shè)計(jì)了一種基于相參處理間隔(CPI)回波stretch處理的抗距離欺騙干擾方法,通過(guò)時(shí)頻解耦合實(shí)現(xiàn)目標(biāo)與干擾分離,結(jié)合濾波處理達(dá)到干擾抑制效果。通過(guò)仿真驗(yàn)證了算法的正確性,分析了算法對(duì)信干比的改善性能,完成了算法在FPGA+DSP硬件平臺(tái)上的移植與功能驗(yàn)證。2.利用DRFM干擾機(jī)的相位量化特性,設(shè)計(jì)了基于信號(hào)分離與平均相位統(tǒng)計(jì)次數(shù)方差抗轉(zhuǎn)發(fā)式干擾的算法。該算法利用動(dòng)目標(biāo)檢測(cè)的結(jié)果分離目標(biāo)回波與干擾信號(hào),然后運(yùn)用分?jǐn)?shù)階傅里葉變換降噪,最后利用統(tǒng)計(jì)量平均相位統(tǒng)計(jì)次數(shù)方差實(shí)現(xiàn)目標(biāo)與干擾的鑒別,通過(guò)仿真驗(yàn)證了算法在多假目標(biāo)場(chǎng)景和低輸入信噪比條件下的有效性。3.利用DRFM轉(zhuǎn)發(fā)式干擾脈沖時(shí)間滯后特性,設(shè)計(jì)了基于多通道處理和脈間初相三次調(diào)制發(fā)射波形的抗轉(zhuǎn)發(fā)式干擾方法。該方法通過(guò)多通道處理獲取轉(zhuǎn)發(fā)式干擾脈沖滯后的脈沖重復(fù)間隔(PRI)數(shù),以此調(diào)整LFM脈沖初相三次調(diào)制系數(shù),通過(guò)對(duì)回波進(jìn)行分?jǐn)?shù)階傅里葉變換與遮蔽處理實(shí)現(xiàn)對(duì)干擾的抑制。通過(guò)仿真驗(yàn)證了算法在多目標(biāo)場(chǎng)景下對(duì)抗轉(zhuǎn)發(fā)式干擾的有效性。
[Abstract]:The high coherent signal processing gain can be obtained by the repeater jamming using digital RF memory (DRFM) technology, which is a difficult problem to be solved in the jamming countermeasure module of LFM LFM radar. In this paper, the application background of LFM radar against forward jamming is discussed. The main work of this paper is as follows: 1. The model of received signal and forward range deception jamming of LFM pulse radar is constructed. A range deception jamming method based on coherent processing interval (stretch) echo processing is designed. The separation of target and interference is realized by time-frequency decoupling. Through simulation, the correctness of the algorithm is verified, and the improved performance of the algorithm to the signal-to-interference ratio is analyzed. The transplant and function verification of the algorithm on FPGA DSP hardware platform is completed. 2. The phase quantization characteristic of DRFM jammer is used. An algorithm based on signal separation and average phase statistics is designed, which uses the result of moving target detection to separate target echo and jamming signal, and then uses fractional Fourier transform to reduce noise. Finally, the average phase statistics variance is used to identify the target and interference. The simulation results show that the algorithm is effective in multi-false target scene and low input SNR. 3. Using DRFM forward jamming pulse time delay characteristic. An anti-forward interference method based on multi-channel processing and three-pulse modulation is designed, which can obtain the number of pulse repetition interval (PRI) of forward jamming pulse lag. The third modulation coefficient of the initial phase of the LFM pulse is adjusted accordingly. The suppression of the interference is realized by fractional Fourier transform and shadowing of the echo, and the effectiveness of the algorithm in the multi-target scene is verified by simulation.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN974

【參考文獻(xiàn)】

相關(guān)期刊論文 前9條

1 周青松;王文濤;王s，

本文編號(hào)：1492474