【摘要】：認(rèn)知雷達(dá)以及低截獲技術(shù)被廣泛應(yīng)用到現(xiàn)代軍事作戰(zhàn)中,因為低截獲雷達(dá)可以有效應(yīng)付各種電磁干擾,避免雷達(dá)被敵方偵察機(jī)發(fā)現(xiàn),提高了雷達(dá)在軍事作戰(zhàn)中的生存率,認(rèn)知雷達(dá)是對低截獲雷達(dá)又一個方向的提升,認(rèn)知雷達(dá)技術(shù)加入到低截獲雷達(dá)中可以有效提升整個雷達(dá)的性能。本文首先介紹了寬帶認(rèn)知雷達(dá)以及低截獲技術(shù)的發(fā)展情況,然后重點對低截獲技術(shù)這一塊作了重點研究,推導(dǎo)了低截獲概率因子以及影響低截獲因子的參數(shù),還討論了一些實現(xiàn)低截獲的理論方法,最后詳細(xì)分析了組合波形的設(shè)計方法以及對優(yōu)化后的波形的性能驗證。在分析和設(shè)計低截獲雷達(dá)波形時,本文首先對雷達(dá)低截獲基礎(chǔ)信號作了簡要分析,然后對模糊函數(shù)作了介紹,由信號的模糊函數(shù)圖來評定雷達(dá)信號的低截獲性能和探測性能。非組合信號都不能滿足低截獲雷達(dá)信號多方面的要求,只有采用組合信號才能集多種信號的優(yōu)點于一體,比如線性調(diào)頻信號有多普勒距離耦合缺點和距離模糊圖旁瓣不夠低的缺點,有帶寬比較寬的優(yōu)點,二相編碼有帶寬較小的缺點,有距離模糊圖旁瓣低的優(yōu)點。結(jié)合上面兩種信號設(shè)計出組合信號就可以綜合兩種信號的優(yōu)點,而且通過模糊圖得到了有效驗證。最后本文新提出一種波形信號,對此信號的構(gòu)造過程、模糊函數(shù)解析式推導(dǎo),以及模糊圖仿真都作了明確分析,得到了近似“圖釘型”的模糊函數(shù)圖,筆者還對該信號的探測性能、抗干擾性能以及其他綜合性能進(jìn)行了分析,比如速度、距離分辨力,多普勒敏感性,抗噪聲特性等。最后采用現(xiàn)有的時頻分析方法對新提出的信號作了仿真分析,并且驗證了該信號比一般組合信號更優(yōu)越的特性,比如比線性調(diào)頻與二相編碼組合信號明顯在時頻分析圖上更加難辨別。
[Abstract]:Cognitive radar and low interception technology are widely used in modern military operations, because low interception radar can effectively cope with all kinds of electromagnetic interference, avoid radar being found by enemy reconnaissance aircraft, and improve the survival rate of radar in military operations. Cognitive radar is another direction of low interception radar. Cognitive radar technology can effectively improve the performance of the whole radar. This paper first introduces the development of broadband cognitive radar and low interception technology, then focuses on the low interception technology, deduces the low interception probability factor and the parameters that affect the low interception factor. Some theoretical methods to realize low interception are also discussed. finally, the design method of combined waveform and the performance verification of optimized waveform are analyzed in detail. When analyzing and designing the waveform of low interception radar, this paper first makes a brief analysis of the basic signal of radar low interception, and then introduces the fuzzy function. The low interception performance and detection performance of radar signal are evaluated by the fuzzy function diagram of the signal. The non-combination signal can not meet the requirements of low interception radar signal in many aspects, only by using the combined signal can we integrate the advantages of many kinds of signals. For example, LFM signal has the disadvantages of Doppler range coupling and range fuzzy graph sidelobe is not low enough, has the advantage of wide bandwidth, two-phase coding has the disadvantage of small bandwidth, and has the advantage of low range fuzzy graph sidelobe. Combined with the above two kinds of signals, the combined signals can synthesize the advantages of the two signals, and the fuzzy graph is used to verify the advantages of the two signals. Finally, a new kind of waveform signal is proposed in this paper. The construction process of the signal, the derivation of the analytical formula of the fuzzy function and the simulation of the fuzzy graph are analyzed clearly, and the fuzzy function diagram approximate to the "nail type" is obtained. The detection performance, anti-interference performance and other comprehensive performance of the signal are also analyzed, such as velocity, range resolution, Doppler sensitivity, anti-noise characteristics and so on. Finally, the existing time-frequency analysis method is used to simulate and analyze the newly proposed signal, and the better characteristics of the signal than the general combined signal are verified. For example, it is more difficult to distinguish the combined signal of linear frequency modulation and two-phase coding on the time-frequency analysis diagram.
【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】：2014
【分類號】：TN957.51

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本文編號：2492897