一种实时自适应脉内特征分析方法  

A Realtime Adaptive Analysis Method of Intrapulse Modulation Characteristics

作　　者：柳桃荣[1] 王明[1] 高新成[1] 

机构地区：[1]中国电子科技集团公司第三十八研究所,安徽合肥230031

出　　处：《雷达科学与技术》2009年第5期354-357,364,共5页Radar Science and Technology

摘　　要：阐述了重构相位的高阶差分和基16 FFT实时脉内特征分析算法原理,提出利用多次相位高阶差分方法识别脉内调频和相位编码两种调制类型,提出分段进行4096点基16 FFT频谱分析的设计思想,保证了线性调频信号脉内特征分析的实时性和精度要求。利用相位高阶差分包络极值检测方法提取信号的突变信息,达到实时提取相位编码信号的脉内调制信息的目的,理论分析了算法的实现过程并给出了脉内分析的流程图。通过仿真和在某大型电子对抗系统上的成功应用,证明了该方法在低信噪比环境下的有效性。The paper describes the high order difference with the reconstructed phaste and the principle of the real-time intra-pulse characteristic analysis based on radix-16 FFT. A modulation recognition method is presented, which can recognize the frequency modulation and phase coded signal by use of multiple high order phase differences method. Also, a design idea is given, in which the signal is divided into blocks with 4096 samples and the radix-16 FFT spectrum analysis is implemented block by block. Thus, the real-time intrapulse characteristic analysis and the accuracy of requirement can be ensured. The change information of the signal is obtained by detecting the extremum of the signal envelope with high order phase difference. The theoretical analysis of the algorithm is performed and the flow chart of the intra-pulse analysis is given. The algorithm presented by the paper is simulated in the computer and applied successfully to a large electronic countermeasure system, which illustrates the validity of the algorithm in the low SNR environment.

关 键 词：脉内特征 相位重构 包络极值 最小二乘 基16 FFT 

分 类 号：TN975[电子电信—信号与信息处理] TN957[电子电信—信息与通信工程]