-
摘要本文以典型无线电引信——伪码调相引信为研究对象，针对其面临的调频干扰，从信号处理的角度研究了其相应的抗干扰处理方法。本文的主要工作包括以下几个方面：
- 上一篇：有限元边界积分方法分析天线电磁特性
- 下一篇：基于FPGA的数据采集系统设计
（1）介绍了伪码调相引信的工作原理和伪随机波形的相关特性。
（2）分析了典型压制式FM干扰的形式及特点，并且采用理论分析与仿真实验相结合、用仿真实验验证理论分析的方法，定量研究了调频干扰对伪码调相引信相关输出的影响。
（3）推导了线性调频干扰的分数阶傅立叶变换结果，提出了抑制伪码调相引信中LFM干扰的分数阶域滤波方法。针对单分量和多分量LFM干扰，给出了分数阶域滤波的具体实现流程。最后对单分量及两分量LFM干扰作用下的伪码调相引信进行了分数阶域滤波仿真实验，结果表明该方法能有效地抑制单分量及多分量LFM干扰。9177
关键词： 伪码调相引信 压制式FM干扰 抗干扰 分数阶傅立叶变换
ABSTRACT
In this dissertation, the typical interference suppression method based on signal processing for typical radio fuze—pseudo-random code phase-modulation (PRCPM) fuze is studied. The main contributions are as followings:
(1)The working principle of the pseudo-Phase Modulation Fuse and the characteristics of the pseudo-random waveform characteristics are introduced .
(2) The forms and features of several kinds of typical oppressive FM interferences are analyzed.The influences of the above FM interferences on the correlation output of PRCPM fuze are studied quantitatively.
(3)The Fractional Fourier Transform (FRFT) result of LFM interference is deduced. To suppress LFM interference imposed on PRCPM fuze, the method of filtering in fractional Fourier domain is proposed. The implementation procedure of suppressing mono and multi-component LFM interferences in fractional Fourier domain is given. The output SJR after interference suppression in fractional Fourier domain is analyzed. At last it is confirmed by simulation that the mono and multi-component LFM interference imposed on PRCPM fuze can be effectively suppressed via the above method.
Key words: PRCPM fuze FM interferences Interference suppression Fractional Fourier transformation.
目 录
摘 要 I
ABSTRACT II
1 绪论 - 2 -
1.1 引信的定义、分类以及重点引信体制的发展 - 2 -
1.2 无线电引信干扰源以及抗干扰技术 - 3 -
2 伪码体制引信工作原理及压制式调频干扰原理 - 6 -
2.1 伪码体制引信工作原理 - 6 -
2.2 伪码引信信号的分析 - 6 -
2.3 伪码波形分析 - 10 -
2.4 周期调制连续波信号的周期模糊函数 - 13 -
2.5 伪码调相引信性能及伪码参数选择 - 14 -
2.5.1 伪码引信的使用性能 - 14 -
2.5.2 引信标准化 - 15 -
2.5.3 伪码调相引信性能分析 - 15 -
2.5.4 伪码参数的选择 - 17 -
3 调频干扰对伪码引信的作用机理 - 19 -
3.1 非平稳信号 - 19 -
3.2 压制式调频干扰 - 19 -
3.3 调频干扰对伪码引信的影响 - 20 -
3.3.1 调频干扰模型 - 20 -
3.3.2 调频干扰对伪码调相引信的影响 - 22 -
4 典型的抗干扰方法—— 分数阶域滤波方法 - 28 -
4.1 抗干扰方法的提出 - 28 -