脉压雷达信号抗干扰性能研究

【作者】 马银玲；

【导师】 田忠；

【作者基本信息】 电子科技大学 ， 信号与信息处理， 2005， 硕士

【摘要】 本文通过对几种雷达信号在不同干扰下的干扰性能的分析和仿真,以及不同干扰下的信干比及主副比的计算,为寻求最佳抗干扰雷达信号形式和对先进雷达信号的干扰提供了理论和仿真数据。现将本文的要点和创新之处归纳如下: 系统的研究了线性调频信号、巴克码信号和二者的混合信号――线性调频-巴克码信号以及巴克码脉间调制信号,分析了它们的脉冲压缩处理过程,并给出了仿真结果;通过建模,从信号理论的角度对各种干扰下匹配滤波输入输出的信干比和输出后的主副比进行了计算,分析了几种先进雷达信号的抗干扰性能并作了比较,用软件仿真验证结果。使二者有机的统一起来。仿真及计算结果表明,噪声干扰和脉冲干扰不能对线性调频脉压信号产生有效干扰;而移频干扰和延时干扰却可以。频移干扰的主要效果是拖距干扰。用移频干扰时要合理考虑频移量。延时干扰是接收雷达发射的信号进行适当的延时而产生的,它是一种有效的干扰信号形式。巴克码信号具有很强的抗噪声干扰和抗脉冲干扰的能力。噪声干扰会随着干扰强度的增加而变大。采用部分码复制干扰和距离欺骗干扰能对巴克码信号产生有效干扰。线性调频-巴克码信号是线性调频信号和二相编码的混合信号,它具有二者的特性,结果表明,混合信号比二者具有更好的抗噪声干扰和脉冲干扰的性能,但是当干信比较高时,调制脉冲干扰能有效形成欺骗假目标而淹没真实目标。移频干扰和距离拖引干扰能对线性调频-巴克码信号产生有效干扰,线性调频干扰和巴克码干扰却不能。巴克码脉间调制雷达信号是巴克码信号的离散化形式,它具有比巴克码信号更好的抗干扰性能。另外一方面,它的抗干扰性能要比脉内线性调频、脉间巴克码调相的线性调频-巴克码信号的抗干扰性能差。更多还原

【Abstract】 Theory and emulation data are offered for searching after the best conjamming Radar signal form and for interfering advanced Radar signal, in this paper, through emulation and analysis of several signal on the different interference. The main conclusions and original results are summarized as follows. LFM and BC and their compounded signal, LFM-BC and BC inter-modeling are studied by the numbers in this paper. The course of pulse compression process is analyzed and the results of emulation are offered. Through modeling, SNR of input and output and RMS of output are computed from the point of view of signal theory, performance of several kind of advanced Radar signal is analyzed and the results are validated by soft emulation. The results of computing and emulating indicate that noise jamming and pulse jamming are invalidated for LFM, but shift-frequenfy jamming and range pull off jamming are valid. The performance of con-jamming of noise and pulse is better, for BC. Obviously, noise jamming is more and more with intensity. Part code copied jamming and distance deceiving jamming is valid. LFM-BC is compounded LFM and BC, so it has their performance. First, it has more performance of anti-noise-jamming and anti-pulse-jamming than LFM and BC. Second, shift-jamming and range pull off jamming are also valid. Difference lies in LFM-BC signal can withstand the LFM-jamming and BC-jamming. BC inter-modeling signal is a discrete style of BC signal, on the one hand, the signal has better anti-jamming performance than BC signal; on the other hand, it has worse anti-jamming performance than LFM-BC signal.更多还原