基于瞬时自相关和FRFT的LFM信号检测性能研究  

Detection Performance of LFM Signal Based on Instantaneous Autocorrelation and FRFT

作　　者：王茂汶 李涛 周涛 

机构地区：[1]电子信息控制重点实验室,成都610036

出　　处：《电子信息对抗技术》2013年第5期1-5,77,共6页Electronic Information Warfare Technology

摘　　要：为解决分数阶傅里叶变换(FRFT)在非合作线性调频(LFM)信号检测中运算量过大,限制其工程应用的问题,提出基于FRFT检测LFM信号/粗测引导+精细测量0的处理算法。理论分析表明:改进算法相比直接采用FRFT运算复杂度大大降低。仿真实验分析了改进算法的运算复杂度、检测灵敏度、参数估计精度,结果表明改进算法的检测灵敏度和参数估计精度能够满足工程需要,证明了理论分析的正确性和该算法的有效性。In order to solve the problem of computation load of fractional Fourier transform in non-co- operation chirp signal detection, a rough measurement guide and fine measurement processing algo- rithm are put forward based on the processing flow of FRFT detection of chirp signal. Theoretical anal- ysis shows that the calculation complexity could be reduced greatly compared with using FRFT direct- ly. The computational complexity, detection sensitivity and parameter estimation accuracy of the im- proved algorithm are analyzed with simulations. The results show that the detection performance and parameter estimation accuracy could meet the needs of engineering, which proves the correctness of the theoretical analysis and the validity of the algorithm.

关 键 词：分数阶傅里叶变换 线性调频信号 截获检测 运算复杂度 

分 类 号：TN971.1[电子电信—信号与信息处理]