摘要
初始频率和调频斜率是表征线性调频信号频率特性的基本参数,如何准确快速地估计它们具有的重要意义。针对传统LFM信号参数估计算法中繁琐的搜索和计算问题,提出了一种不需要参数搜索的快速LFM信号参数估计算法。该算法先用希尔伯特变换估计LFM信号瞬时相位,再用高阶差分估计LFM信号瞬时频率特性,最后用直线拟合LFM信号瞬时频率特性从而得到初始频率和调频斜率的估计。仿真实验验证了本文算法的有效性,说明本文算法能够给出满意的参数估计结果。
Initial frequency and frequency modulation rate are the basic parameters for representing LFM signals＇ characteristics, thus how to estimate them accurately and fast is significant. Aiming at complex searching and computing for parameter estimation of LFM signals, a fast algorithm without parameter search- ing is proposed. This method estimates the instantaneous phase by Hilbert transform and then the instantane ous frequency characteristic though high-order difference. At last, linear fitting of the instantaneous frequency characteristic is used to give the estimations of initial frequency and frequency modulation rate. The simu lation verifies the effectiveness of the proposed method in parameter estimation.
出处
《雷达科学与技术》
2009年第3期219-221,共3页
Radar Science and Technology
关键词
LFM信号
希尔伯特变换
高阶差分
直线拟合
瞬时相位
瞬时频率
linear frequency modulation（LFM） signals
Hilbert transform
high-order difference
linearfitting
instantaneous phase
instantaneous frequency
