摘要
根据傅里叶变换法测频原理,提出了一种可以测量同时到达多个信号的数字瞬时测频接收机方案,利用Matlab/Simulink工具对接收机进行了系统建模仿真。仿真结果表明,在同时到达多个信号的情况下,系统能准确测量各信号载频参数。最后研究了频率估计算法,结果显示,三次插值的方法既具有高的测频精度,又减少了测频时间。
Based on FFT frequency measuring theory, a digital instantaneous frequency measurement （DIFM） system that can measure multiple signals, using Matlab＇ s Simulink tool to model the DIFM system is proposed. Simulation results show that the system can precisely measure the carrier frequencies when more than one signal come. The frequency estimating algorithm is studied and simulation shows that the simple cubic convolution method has higher precision and shorter IFM time.
出处
《现代防御技术》
北大核心
2010年第4期146-150,共5页
Modern Defence Technology
关键词
瞬时测频
欠采样
频率估计
多采样率
instantaneous freqency measurment （ IFM ）
undersampling
frequency estimation
multi-sampling rate
