本文關(guān)鍵詞： MIMO雷達(dá) 波形設(shè)計(jì) 混沌信號(hào) 脈沖壓縮 正交信號(hào)　出處：《吉林大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：MIMO雷達(dá)作為一種新體制雷達(dá)，它打破了傳統(tǒng)雷達(dá)利用波束掃描的測(cè)探方式。MIMO通過(guò)發(fā)射正交波形的方式進(jìn)行全空域覆蓋探測(cè)，具有更好的分辨率、抗截獲與抗干擾性等特點(diǎn)，成為近年來(lái)雷達(dá)領(lǐng)域研究的熱點(diǎn)。MIMO雷達(dá)發(fā)射信號(hào)的正交性直接影響MIMO雷達(dá)功能能否實(shí)現(xiàn)，因此正交波形設(shè)計(jì)是MIMO雷達(dá)技術(shù)中重要的一個(gè)環(huán)節(jié)。 目前MIMO雷達(dá)波形設(shè)計(jì)方法主要是通過(guò)建立代價(jià)函數(shù)，利用優(yōu)化算法進(jìn)行組合優(yōu)化獲得正交編碼波形。這一類方法存在效率低、不能隨MIMO雷達(dá)陣元與發(fā)射信號(hào)碼長(zhǎng)靈活變化等一類問(wèn)題，本文研究將混沌信號(hào)應(yīng)用到MIMO雷達(dá)波形設(shè)計(jì)中�；煦缧盘�(hào)作為一類偽隨機(jī)信號(hào)，擁有良好的隨機(jī)性、初值敏感性、遍歷性、正交性等特點(diǎn)，本文充分發(fā)揮混沌信號(hào)的這一系列優(yōu)點(diǎn)進(jìn)行MIMO雷達(dá)的正交波形設(shè)計(jì)。 本文針對(duì)MIMO雷達(dá)發(fā)射信號(hào)正交性的特點(diǎn)，利用混沌信號(hào)理論進(jìn)行波形設(shè)計(jì)，主要研究工作如下： 1.首先，針對(duì)MIMO雷達(dá)發(fā)射信號(hào)的特點(diǎn)，本文對(duì)采用的MIMO雷達(dá)波形設(shè)計(jì)準(zhǔn)則，即正交性準(zhǔn)則與模糊特性準(zhǔn)則進(jìn)行了系統(tǒng)的闡述。 2.其次，本文采用混沌信號(hào)對(duì)高頻載波進(jìn)行連續(xù)調(diào)幅的MIMO雷達(dá)波形設(shè)計(jì)方法。獲得的雷達(dá)信號(hào)的復(fù)包絡(luò)為仍為混沌信號(hào)，具有混沌信號(hào)的寬頻譜性、正交性等特點(diǎn)。雷達(dá)信號(hào)的性能主要由混沌信號(hào)決定，同時(shí)利用混沌信號(hào)初值敏感性，以及不同類型混沌信號(hào)的正交性，可以獲得大容量的正交信號(hào)集。 3.再次，本文采用基于混沌信號(hào)連續(xù)調(diào)頻的MIMO雷達(dá)波形設(shè)計(jì)方法。通過(guò)利用歸一化的混沌信號(hào)對(duì)載波信號(hào)的頻率進(jìn)行連續(xù)調(diào)制，使得雷達(dá)信號(hào)的頻率在帶寬內(nèi)隨機(jī)變化。本方法有別于基于混沌序列離散頻率編碼信號(hào)的波形設(shè)計(jì)，不需進(jìn)行序列整數(shù)化和排序，而是使雷達(dá)信號(hào)的頻率完全按混沌信號(hào)的規(guī)律隨機(jī)變化，隨機(jī)性更佳�；诨煦缧盘�(hào)連續(xù)調(diào)頻方法屬于對(duì)相位譜調(diào)制方法。利用該方法獲得的正交信號(hào)是具有非線性相位的脈沖壓縮信號(hào)，時(shí)寬帶寬積遠(yuǎn)大于1，具有良好的模糊特性。 4.最后，本文采用基于混沌序列相位編碼的MIMO雷達(dá)波形設(shè)計(jì)方法。利用混沌序列相位編碼波形設(shè)計(jì)方法代替常見(jiàn)偽隨機(jī)序列編碼波形，解決了因序列長(zhǎng)度有限、得到自相關(guān)旁瓣過(guò)高的問(wèn)題。同時(shí)，本文對(duì)基于混沌二相編碼的改進(jìn)波形設(shè)計(jì)方法，，研究了基于雙混沌映射二相編碼波形設(shè)計(jì)方法。利用改進(jìn)相位編碼方法獲得MIMO雷達(dá)發(fā)射信號(hào)在各發(fā)射周期發(fā)射不同一組正交波形，在保證MIMO雷達(dá)信號(hào)發(fā)射信號(hào)正交性的基礎(chǔ)上，進(jìn)一步提高發(fā)射信號(hào)的隨機(jī)性，降低雷達(dá)信號(hào)被截獲的概率，提高雷達(dá)的隱身性。
[Abstract]:As a new system radar, MIMO radar has better resolution by transmitting orthogonal waveforms. The characteristics of anti-interception and anti-jamming have become a hot topic in the field of radar in recent years. The orthogonality of the transmitted signal of MIMO radar has a direct impact on the realization of MIMO radar function. Therefore, orthogonal waveform design is an important part of MIMO radar technology. At present, the MIMO radar waveform design method is mainly through the establishment of cost function, using optimization algorithm to optimize the combination of orthogonal coding waveform, this kind of method has low efficiency. The chaotic signal is applied to the design of MIMO radar waveform. The chaotic signal is regarded as a kind of pseudorandom signal. It has good randomness, initial value sensitivity, ergodicity, orthogonality and so on. This paper gives full play to this series of advantages of chaotic signal to design the orthogonal waveform of MIMO radar. According to the orthogonality of MIMO radar transmit signal, the waveform is designed by using chaotic signal theory. The main research work is as follows: 1. Firstly, according to the characteristics of MIMO radar signal, the design criteria of MIMO radar waveform, i.e. orthogonality criterion and fuzzy characteristic criterion, are systematically described in this paper. 2. Secondly, the MIMO radar waveform design method of chaotic signal is adopted. The complex envelope of the obtained radar signal is still chaotic signal, which has the wide spectrum of chaotic signal. The performance of radar signal is mainly determined by chaotic signal. By using the sensitivity of initial value of chaotic signal and the orthogonality of different types of chaotic signal, a large capacity orthogonal signal set can be obtained. 3. Thirdly, the MIMO radar waveform design method based on continuous frequency modulation of chaotic signal is adopted, and the frequency of carrier signal is modulated continuously by using the normalized chaotic signal. This method is different from the waveform design of discrete frequency coding signal based on chaotic sequence and does not need sequence integer and sorting. Instead, the frequency of radar signal is changed randomly according to the law of chaotic signal. The method based on continuous frequency modulation of chaotic signal belongs to the phase spectrum modulation method. The orthogonal signal obtained by this method is a pulse compression signal with nonlinear phase, and the time bandwidth wide product is far greater than 1. It has good fuzzy property. 4. Finally, the MIMO radar waveform design method based on chaotic sequence phase coding is adopted, and the chaotic sequence phase coding waveform design method is used to replace the common pseudorandom sequence coding waveform. The problem that the autocorrelation sidelobe is too high is solved because of the limited length of the sequence. At the same time, the improved waveform design method based on chaotic two-phase coding is proposed in this paper. The design method of two-phase coded waveform based on double chaotic mapping is studied. The improved phase coding method is used to obtain the different sets of orthogonal waveforms transmitted by MIMO radar signals in different transmission periods. On the basis of ensuring the orthogonality of MIMO radar signal, the randomness of transmitting signal is further improved, the probability of radar signal being intercepted is reduced, and the stealth of radar is improved.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN957.51

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