基于FRFT的LFM信号参数估计误差分析  

Analysis and Simulation of Estimation Accuracy of LFM Signal Parameters Based on FRFT

作　　者：李丽慧[1] 阮怀林[1] 王益磊 

机构地区：[1]电子工程学院,合肥230037 [2]电子对抗卫星总站,北京100094

出　　处：《电子信息对抗技术》2012年第6期16-20,共5页Electronic Information Warfare Technology

摘　　要：分析了运用分数阶傅立叶变换(FRFT)估计线性频率调制(LFM)信号参数时影响其估计误差的几个因素。通过仿真和比较得出采样点数和旋转角度搜索间隔与参数估计误差之间的关系:初始频率的估计误差随着采样点数的增大而减小;调频斜率的估计误差随着旋转角度搜索间隔的减小而减小。基于此,可以针对不同的情况在相同的计算量下,通过不同的选择更好地满足精度要求。仿真结果验证了该结论的有效性。The main factors are analyzed which affecting the estimation accuracy of linear frequency modulation（LFM） signal parameters based on fractional Fourier transform（FRFT）.By simulation and comparing,the conclusion could be achieved that the estimation accuracy of initial frequency is improved along with the sample points increasing,while the modulation frequency slope is improved along with the search interval decreasing.So the estimation accuracy of LFM signal parameters could be advanced according to different cases at the same computational cost.The conclusion is verified by the simulation.

关 键 词：分数阶傅立叶变换 线性频率调制 采样点数 搜索间隔 

分 类 号：TN971.1[电子电信—信号与信息处理]