本文選題：有源欺騙干擾　切入點(diǎn)：抗干擾　出處：《電子科技大學(xué)》2015年碩士論文

【摘要】：現(xiàn)代電子戰(zhàn)中基于數(shù)字射頻儲存器(DRFM)有源欺騙干擾的出現(xiàn)與廣泛使用,使得雷達(dá)抗干擾面臨愈來愈多的困難。有源欺騙干擾與雷達(dá)信號具有極強(qiáng)的相干性,在雷達(dá)接收端易形成虛假目標(biāo),使雷達(dá)難以分辨,嚴(yán)重耗費(fèi)雷達(dá)資源,給雷達(dá)帶來了嚴(yán)峻的挑戰(zhàn)和威脅。因此,為提高雷達(dá)系統(tǒng)的抗干擾性能和探測能力,針對雷達(dá)有源欺騙干擾的抗干擾技術(shù)逐步成為了國內(nèi)外學(xué)者研究的重點(diǎn)和熱點(diǎn)。本文圍繞典型有源欺騙干擾的抑制問題,立足于波形分集技術(shù),主要做了以下幾方面的研究工作:1、研究了距離波門拖引干擾、距離假目標(biāo)干擾和截取復(fù)制(CI)干擾三種典型距離欺騙干擾,以及速度波門拖引干擾和速度假目標(biāo)干擾兩種典型速度欺騙干擾的產(chǎn)生機(jī)理和數(shù)學(xué)模型,并仿真分析了典型有源欺騙干擾對雷達(dá)探測的影響。2、研究了基于正交頻分-線性調(diào)頻(OFD-LFM)的抗干擾波形設(shè)計(jì)方法,該方法利用正交LFM波形的低互相關(guān)性,并通過加窗匹配濾波降低波形間的自相關(guān)旁瓣水平,使設(shè)計(jì)的OFD-LFM波形集具有抗距離波門拖引干擾、假目標(biāo)干擾和CI干擾的特性,可以將干擾尖峰抑制20 dB以上,有效提高了雷達(dá)在干擾環(huán)境下的目標(biāo)探測性能。3、針對典型距離假目標(biāo)干擾,研究了基于相位編碼的抗干擾波形設(shè)計(jì)方法,該方法通過設(shè)計(jì)具有低自相關(guān)旁瓣和互相關(guān)旁瓣的相位編碼波形,實(shí)現(xiàn)了對距離波門拖引干擾和距離假目標(biāo)干擾的良好抑制性能,在抑制區(qū)域內(nèi),干擾尖峰可被抑制20 dB以上。4、針對強(qiáng)速度欺騙干擾,提出了基于阻帶循環(huán)算法(SCAN)的優(yōu)化初始相位波形設(shè)計(jì)方法和基于子空間牛頓算法的優(yōu)化初始相位波形設(shè)計(jì)方法。這兩種方法分別利用SCAN算法和子空間牛頓算法設(shè)計(jì)具有特定阻帶抑制特性的脈間初始相位波形,不僅適用于單目標(biāo)單干擾場景,也適用于多目標(biāo)多干擾場景,在強(qiáng)速度欺騙干擾環(huán)境下能極大抑制目標(biāo)附近的干擾能量,有效提高了目標(biāo)處的信干噪比,同時也增強(qiáng)了微弱目標(biāo)的檢測。仿真結(jié)果驗(yàn)證了波形分集技術(shù)對抗典型有源欺騙干擾的有效性。結(jié)果說明,相對于傳統(tǒng)雷達(dá)采用的固定發(fā)射波形模式,波形分集可以有效提高雷達(dá)抗有源欺騙干擾的性能,以及有源欺騙干擾環(huán)境下雷達(dá)的目標(biāo)檢測概率。
[Abstract]:The emergence and wide use of active deception jamming based on digital radio frequency storage (DRFM) in modern electronic warfare make radar anti-jamming more and more difficult.Active deceptive jamming has strong coherence with radar signal, so it is easy to form false targets in radar receiver, which makes radar difficult to distinguish, seriously consumes radar resources, and brings severe challenges and threats to radar.Therefore, in order to improve the anti-jamming performance and detection ability of radar system, the anti-jamming technology for radar active deception jamming has gradually become the focus and hotspot of domestic and foreign scholars.This paper focuses on the suppression of typical active deceptive jamming. Based on waveform diversity technology, this paper mainly studies the following aspects of research work: 1, and studies the range wave gate towing interference.The mechanism and mathematical model of the three typical range deception jamming, the velocity wave gate drag jamming and the velocity false target jamming, are discussed.The influence of typical active deceptive jamming on radar detection is analyzed by simulation. The anti-jamming waveform design method based on OFD-LFM is studied. The method uses the low correlation of orthogonal LFM waveform.By using windowed matched filter to reduce the autocorrelation sidelobe level, the designed OFD-LFM waveform set has the characteristics of resisting range gate drag interference, false target interference and CI interference, which can suppress the interference peak more than 20 dB.The target detection performance of radar in jamming environment is improved effectively. Aiming at the typical range false target jamming, the design method of anti-jamming waveform based on phase coding is studied.By designing phase coded waveforms with low autocorrelation sidelobe and cross correlation sidelobe, the method achieves good performance in suppressing range gate towing interference and range false target interference.The interference peak can be suppressed by more than 20 dB. For the strong speed deception interference, an optimal initial phase waveform design method based on stopband cycle algorithm (SCANA) and an optimized initial phase waveform design method based on subspace Newton algorithm are proposed.The two methods use the SCAN algorithm and the subspace Newton algorithm to design the initial phase waveforms with specific stopband suppression characteristics, which are not only suitable for single target single interference scenes, but also suitable for multi-target multi-jamming scenarios.In the environment of strong speed deception jamming, the jamming energy near the target can be greatly suppressed, the signal-to-noise ratio at the target is improved effectively, and the detection of weak targets is also enhanced.The simulation results demonstrate the effectiveness of waveform diversity technique against typical active deception jamming.The results show that the waveform diversity can effectively improve the performance of radar against active deceptive jamming and the target detection probability in the environment of active deceptive jamming.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN974
，

本文編號：1723757