低截获概率雷达的波形研究-信号与信息处理专业论文.docx

万方数据 万方数据 江苏科技大学工学硕士学位论文 II 江 苏 科 技 大 学 硕 士 学 位 论 文 大 摘 要 论 文 题 目 低截获概率雷达 的波形研究 研 究 方 向 现代雷达信号处理 学 科 、 专 业 信 号 与 信 息 处 理 研 究 生 姓 名 彭智慧 导 师 姓 名 林明教授 填表时间 2014 年 3 月 24 日 Abstract Abstract On the modern battlefield, radar faces electronic attacks and threats from anti-radiation missiles increasingly severely, so stealth of radar signals is essential for radar. There are many ways to achieve characteristics of low probability of intercept radar in which waveform design of the radar signal plays a key role. In this paper, the definition of low probability of intercept ion radar is proposed. The theoretical formulas of radar intercept factor is derived in detail to analyze the factors affecting the performance of low probability of interception radar, in order to come up with the characteristics for reaching LPI radar waveform. The main tool of radar waveform design is introduced and an overview of the characteristics of ambiguity function has been presented. Then numerical algorithm of ambiguity function is put forward. Firstly, for typical single- modulated signal waveform research, the time and frequency domain characteristics, time-bandwidth product and ambiguity functions of LFM and two- phase encoded signals, etc., are analyzed. The Doppler effect of LFM signal and two-phase encoded signals are analyzed and the impact of the Doppler shift on pulse output of chirp signal and two-phase encoded signal after pulse compression is verified by simulation. The conclusion is drawn that chirp and two-phase encoded signal waveform has its own advantages and disadvantages. The coding format of multiphase encoding Frank, P1, P2, P3 and P4 and phase characteristics of poly-phase encoded signals are described, and it is verified by computer simulation. Focusing on the characteristics the low probability of intercept radar waveform of Frank and P4 poly-phase coded modulation, the ambiguity function formulas is deduced in detail and having better low intercept