【摘要】： 雷達(dá)是現(xiàn)代戰(zhàn)爭(zhēng)中重要的利用電磁波探測(cè)目標(biāo)的電子裝備。隨著雷達(dá)電子對(duì)抗技術(shù)的發(fā)展,電子反對(duì)抗技術(shù)作為影響雷達(dá)生存的重要因素引起國(guó)內(nèi)外雷達(dá)工作者的廣泛關(guān)注。 本論文以線性調(diào)頻脈沖壓縮體制的對(duì)空情報(bào)雷達(dá)為對(duì)象,圍繞有源干擾抑制技術(shù)展開研究。重點(diǎn)在有源加性復(fù)合干擾與新型干擾的干擾抑制算法研究,以及對(duì)常規(guī)有源干擾現(xiàn)有抑制算法的驗(yàn)證。本文的主要工作如下: 第一、研究了典型有源干擾的產(chǎn)生機(jī)理與作用機(jī)理。包括常規(guī)有源干擾、有源加性復(fù)合干擾與靈巧噪聲干擾。有源加性復(fù)合干擾與靈巧噪聲干擾是本文的主要研究對(duì)象,通過仿真分析了其信號(hào)特征,并從理論上推導(dǎo)了其時(shí)域表達(dá)式與干擾性能。 第二、針對(duì)有源加性復(fù)合干擾,研究了基于相位擾動(dòng)原理的干擾抑制方法。在結(jié)合LFM信號(hào)特征的基礎(chǔ)上,采用對(duì)雷達(dá)發(fā)射信號(hào)的前后脈沖分別附加近似正交的擾動(dòng)相位,再通過相應(yīng)于前一脈沖重復(fù)周期的匹配濾波器將復(fù)合干擾中的欺騙干擾成分加強(qiáng),然后對(duì)脈沖壓縮結(jié)果加以“懲罰”,最后采用匹配濾波逆運(yùn)算恢復(fù)出目標(biāo)回波信號(hào)。 第三、考慮到加性復(fù)合干擾的產(chǎn)生機(jī)理與信號(hào)特征,研究了雷達(dá)有源加性復(fù)合干擾分步抑制算法。由于該算法抑制復(fù)合干擾直觀,且可以運(yùn)用已有的常規(guī)干擾抑制算法,故算法有一定的實(shí)用價(jià)值。該算法存在的不足之處是需要已知復(fù)合干擾信號(hào)的類型,在實(shí)際使用時(shí)需要在雷達(dá)系統(tǒng)中將該算法配合干擾類型識(shí)別以及抗干擾措施選取使用。 第四、研究了一種基于LFM信號(hào)解線調(diào)的靈巧噪聲干擾抑制算法。該算法以雷達(dá)前一脈沖重復(fù)周期的接收信號(hào)為參考,求得其與當(dāng)前脈沖重復(fù)周期雷達(dá)接收信號(hào)的差拍信號(hào),將目標(biāo)信號(hào)移至低頻,通過濾波抑制干擾,再通過差拍逆運(yùn)算可以恢復(fù)出目標(biāo)回波信號(hào)。 第五、構(gòu)建與實(shí)際情況相似的仿真平臺(tái),對(duì)現(xiàn)有常規(guī)有源干擾抑制算法進(jìn)行驗(yàn)證。仿真平臺(tái)的構(gòu)建是通過適當(dāng)修改某雷達(dá)站某次對(duì)抗現(xiàn)場(chǎng)試驗(yàn)中所采用的某型雷達(dá)、某型壓制式干擾機(jī)與某型欺騙式干擾機(jī)的實(shí)際參數(shù)得到的。仿真驗(yàn)證的干擾抑制算法包括:基于對(duì)消的噪聲調(diào)頻干擾抑制算法與基于LFM雷達(dá)Stretch處理的距離假目標(biāo)干擾抑制算法。
[Abstract]:Radar is an important electronic equipment for detecting targets by electromagnetic wave in modern warfare. With the development of radar electronic countermeasure technology, electronic anti-rejection technology, as an important factor affecting radar survival, has attracted extensive attention of radar workers at home and abroad. In this thesis, the active jamming suppression technology is studied based on the linear frequency modulation pulse compression radar. Emphasis is placed on the study of active additive complex jamming and new jamming suppression algorithms, as well as the verification of existing active jamming suppression algorithms. The main work of this paper is as follows: first, the mechanism of generation and action of typical active jamming is studied. It includes conventional active jamming, active additive complex jamming and dexterous noise jamming. Active additive complex interference and dexterous noise interference are the main research objects in this paper. The signal characteristics are analyzed by simulation, and the time domain expression and jamming performance are derived theoretically. Secondly, the interference suppression method based on phase perturbation principle is studied for active additive complex jamming. Based on the characteristics of LFM signal, the deceptive jamming component in the composite jamming is strengthened by using the matching filter corresponding to the previous pulse repetition period by adding approximately orthogonal perturbed phase to the front and rear pulses of the radar transmitted signal, and then using the matching filter corresponding to the previous pulse repetition period to strengthen the deceptive jamming component in the composite jamming. Then the pulse compression results are "punished", and the target echo signal is recovered by the inverse operation of matched filter. Thirdly, considering the generation mechanism and signal characteristics of additive compound jamming, the step suppression algorithm of radar active additive composite jamming is studied. Since the algorithm is intuitive in suppressing complex interference and can be used in the conventional interference suppression algorithm, it has some practical value. The shortcoming of this algorithm is that it needs to know the type of complex jamming signal, and it needs to be used in radar system to identify the jamming type and select anti-jamming measures. Fourthly, a dexterous noise interference suppression algorithm based on LFM signal delinearization is studied. The algorithm takes the received signal of the previous pulse repetition period as the reference, obtains the beat signal between the received signal of the radar and the current pulse repetition period radar, moves the target signal to the low frequency, and suppresses the interference by filtering. Then the target echo signal can be recovered by the beat inversion operation. Fifthly, a simulation platform similar to the actual situation is constructed to verify the existing conventional active jamming suppression algorithms. The simulation platform is constructed by modifying the actual parameters of a certain radar, a certain type of suppression jammer and a certain type of deceptive jammer, which are used in the field test of a certain radar station. The simulation results show that the jamming suppression algorithms include noise FM jamming suppression algorithm based on cancellation and range false target jamming suppression algorithm based on LFM radar Stretch processing.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2010
【分類號(hào)】：TN974

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