正弦调频连续波信号参数估计新方法  

A new method of parameter estimation for sinusoidal frequency modulated continuous wave signal

作　　者：聂小鹏 沈祖成 王晓峰[2] 王春雨[2] 

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002 [2]空军航空大学信息对抗系,吉林长春130022

出　　处：《电信科学》2018年第2期74-80,共7页Telecommunications Science

摘　　要：针对电子侦察截获的正弦调频连续波信号,提出一种调制参数估计的新方法。首先基于信号调制函数的周期性,采用自相关函数完成调制频率估计,然后基于重排谱图提取调频曲线,对调频曲线进行修正,进而实现载频、调制指数和初始调制相位的估计。仿真实验表明,该方法在无需先验知识,且信噪比为-5 dB时,各调制参数均具有较高的估计精度,均方误差均能低于-25 dB。A new method of modulation parameter estimation was proposed to process the sinusoidal frequency modulated continuous wave signal intercepted by electronic reconnaissance. Firstly, based on the periodicity of signal modulation function, the modulated frequency was estimated using autocorrelation function. And then, the frequency modulation curve was extracted and revised based on rearranging spectrogram. Finally, the carrier frequency, the modulation exponent and the initial phase were estimated by the frequency modulation curve. The simulation experiment results show that the proposed method does not require prior knowledge, and the mean square error of each modulation parameter can reach -25 dB by using this method when SNR is -5 dB.

关 键 词：正弦调频连续波信号 参数估计 自相关函数 重排谱图 

分 类 号：TN971.1[电子电信—信号与信息处理]