發(fā)布時(shí)間：2018-02-15 22:52

  本文關(guān)鍵詞： 低截獲概率 波形設(shè)計(jì) 抗干擾 自適應(yīng)調(diào)制 擴(kuò)頻　出處：《西南交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：在現(xiàn)代戰(zhàn)爭(zhēng)中,飛行器之間通信信息的隱蔽性是取得勝利的關(guān)鍵要素。為滿足戰(zhàn)場(chǎng)通信對(duì)低截獲概率和抗干擾性能的需求,通信系統(tǒng)是否具有良好的低截獲概率性能,就成了取得戰(zhàn)爭(zhēng)勝利的首要條件。低截獲概率通信技術(shù)已經(jīng)成為當(dāng)代軍事信息技術(shù)的熱點(diǎn)。本文首先介紹了低截獲概率通信波形的背景、發(fā)展與研究現(xiàn)狀,介紹了低截獲概率通信場(chǎng)景模型,闡述了低截獲概率通信波形性能評(píng)估的基本方法。其次,具體研究了低截獲概率波形相關(guān)技術(shù)的性能。這里先研究了信道編碼技術(shù)的性能。仿真表明非二進(jìn)制LDPC碼,擁有較好的抗干擾能力,在信道條件不佳的情況下性能更好。隨后分析了幾種常見調(diào)制方式的誤碼率性能和低截獲概率性能。介紹了自適應(yīng)調(diào)制方案,根據(jù)反饋信道的信息對(duì)信號(hào)的調(diào)制方式進(jìn)行選擇和切換。接著分析了直接序列擴(kuò)頻系統(tǒng)的性能。仿真結(jié)果顯示擴(kuò)頻因子越大,通信波形的截獲距離越短,干擾的影響越小。之后,分析了跳頻系統(tǒng)性能,對(duì)比了不同跳頻序列,并對(duì)跳頻系統(tǒng)在寬帶干擾下性能進(jìn)行了研究。仿真顯示,跳頻系統(tǒng)能夠有效對(duì)抗寬帶干擾。對(duì)于跟蹤式干擾或跟蹤式偵察,提高跳頻速率能夠有效躲避跟蹤。然后,根據(jù)分析結(jié)果確定了整體波形設(shè)計(jì)方案：采用非二進(jìn)制LDPC信道編碼,自適應(yīng)調(diào)制、直接序列擴(kuò)頻和寬間隔快跳頻結(jié)合的波形方案,給出了根據(jù)實(shí)際場(chǎng)景和需求對(duì)具體技術(shù)的具體參數(shù)設(shè)置的建議。整體波形仿真表明所設(shè)計(jì)的方案能夠顯著提高系統(tǒng)的低截獲概率性能。最后,使用Matlab的GUI套件實(shí)現(xiàn)了低截獲概率波形仿真程序。平臺(tái)可以實(shí)現(xiàn)兩種場(chǎng)景實(shí)時(shí)仿真演示、跳頻序列生成、性能仿真結(jié)果展示等功能。
[Abstract]:In modern warfare, the concealment of communication information between aircraft is the key element of victory. In order to meet the requirements of battlefield communication for low probability of interception and anti-jamming performance, whether the communication system has good performance of low probability of interception. LPI technology has become a hot topic in modern military information technology. Firstly, this paper introduces the background, development and research status of LPI waveform. The scene model of LPI communication is introduced, and the basic method to evaluate the waveform performance of LPI communication is described. Secondly, The performance of low probability of interception waveform correlation technology is studied. The performance of channel coding technique is studied first. The simulation results show that non-binary LDPC codes have good anti-jamming capability. The performance is better when the channel condition is not good. Then, the BER and LPI performance of several common modulation methods are analyzed, and the adaptive modulation scheme is introduced. The modulation mode of the signal is selected and switched according to the information of the feedback channel. Then the performance of the direct sequence spread spectrum system is analyzed. The simulation results show that the larger the spread spectrum factor is, the shorter the intercept distance of the communication waveform is. After analyzing the performance of FH system and comparing different FH sequences, the performance of FH system under wideband interference is studied. Frequency-hopping system can effectively resist wideband interference. For tracking jamming or tracking reconnaissance, increasing FH rate can effectively avoid tracking. Then, according to the analysis results, the overall waveform design scheme is determined: using non-binary LDPC channel coding, The waveform scheme of adaptive modulation, direct sequence spread spectrum and wide interval fast frequency hopping, The suggestions of setting the specific parameters of the specific technology according to the actual situation and requirements are given. The simulation of the whole waveform shows that the designed scheme can significantly improve the performance of the low probability of interception (LPI) of the system. The simulation program of low probability of interception waveform is implemented by using GUI package of Matlab. The platform can realize two kinds of scene real-time simulation demonstration, frequency hopping sequence generation, performance simulation result display and so on.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：E96;TN97

【參考文獻(xiàn)】

相關(guān)期刊論文 前4條

1 陶偉;張帆;劉新安;楊雪飛;劉冰;;多進(jìn)制LDPC碼抗突發(fā)噪聲性能[J];北京郵電大學(xué)學(xué)報(bào);2011年S1期

2 高英;m序列優(yōu)選對(duì)的實(shí)現(xiàn)及平衡Gold序列分析[J];計(jì)算機(jī)與網(wǎng)絡(luò);2000年17期

3 胡建凱,曾興雯;擴(kuò)頻通信系統(tǒng)中跳頻圖案的設(shè)計(jì)實(shí)現(xiàn)[J];無線通信技術(shù);2002年02期

4 李丹;白寶明;孫蓉;;多元LDPC碼與二元LDPC碼的性能比較[J];無線通信技術(shù);2007年03期

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本文編號(hào)：1514069