雷达侦察数字接收与信号处理技术研究

发布时间：2018-05-23 10:38

本文选题：数字接收机 + 实时处理　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：在现代电子战中,面临着日益严峻的电磁环境,在频段宽、待处理的信号种类多,且处于被动接收工作条件的背景下,雷达侦察数字接收机对实时信号处理的要求达到了前所未有的高度。而在雷达侦察数字接收机中,高精度高速ADC采样器件的速度与当前处理器实时处理能力之间存在严重瓶颈,数字侦察接收机处理数据速度增长缓慢已成为限制当今雷达数字化侦察接收机提高速度的主要因素。本文首先从理论上分析了数字接收机的基本结构,详细分析了系统构成,针对工作原理进行了详细的阐述,对三种典型数字接收机进行了简要性能分析。其次分析了数字接收系统理论,针对现在接收机结构中后端数字信号处理速率无法匹配前端高速ADC转换速率的问题,着重分析了多速率处理技术,并且探讨了几种数字中频处理技术。针对典型雷达信号,分析了描述雷达信号的特征参数,并且对单载频脉冲信号、线性调频脉冲信号以及相位编码脉冲信号进行了介绍。然后分析了几种典型雷达信号的时频分析方法,将瞬时自相关、短时傅里叶变换、WVD分布和小波变换进行比较,分析了各自优缺点,并且确定本文使用短时傅里叶变换进行信号准最佳接收处理。详细分析了短时傅里叶变换,针对滑动点数对算法性能的影响、算法整体运算量和时域精度分析进行阐述。然后介绍了信号检测理论与门限阈值分析理论,并对窄带谱能量频率估计算法进行了介绍。最后分别对单载频脉冲信号、线性调频脉冲信号以及相位编码脉冲信号进行了准最佳接收的仿真与分析。依次对理想信号,噪声信号进行仿真,对噪声信号进行信噪比分析。对频率误差及脉宽误差分别进行了详细的信噪比影响对比。
[Abstract]:In modern electronic warfare, it is faced with increasingly severe electromagnetic environment. In the background of wide frequency band, many kinds of signals to be processed, and passive receiving working conditions, The requirement of real-time signal processing in radar reconnaissance digital receiver has reached an unprecedented level. However, in the radar reconnaissance digital receiver, there is a serious bottleneck between the speed of the high precision and high speed ADC sampling device and the real-time processing capability of the current processor. The slow growth of data processing speed of digital reconnaissance receiver has become the main factor limiting the speed of radar digital reconnaissance receiver. In this paper, the basic structure of the digital receiver is analyzed theoretically, the system structure is analyzed in detail, the working principle is described in detail, and the performance of the three typical digital receivers is analyzed briefly. Secondly, the theory of digital receiving system is analyzed. Aiming at the problem that the back-end digital signal processing rate can not match the front-end high-speed ADC conversion rate, the multi-rate processing technology is emphatically analyzed. Several digital intermediate frequency processing techniques are also discussed. For typical radar signal, the characteristic parameters describing radar signal are analyzed, and the single carrier frequency pulse signal, linear frequency modulation pulse signal and phase coded pulse signal are introduced. Then, the time-frequency analysis methods of several typical radar signals are analyzed. The instantaneous autocorrelation, short time Fourier transform (STFT) WVD distribution and wavelet transform are compared, and their advantages and disadvantages are analyzed. And it is determined that the short-time Fourier transform is used for quasi-optimal signal reception. The short time Fourier transform (STFT) is analyzed in detail. The effect of sliding points on the performance of the algorithm is discussed. Then the signal detection theory and threshold analysis theory are introduced, and the narrowband spectrum energy frequency estimation algorithm is introduced. At last, the simulation and analysis of single carrier frequency pulse signal, linear frequency modulation pulse signal and phase coded pulse signal are carried out. The ideal signal and noise signal are simulated in turn, and the signal-to-noise ratio of the noise signal is analyzed. The effects of frequency error and pulse width error on SNR are compared in detail.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.51

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