摘要
针对时域欠采样线性调频信号参数估计问题,提出一种对调制斜率和初始频率无模糊估计的方法。接收信号经过功分器分为三路异频欠采样通道,前两路进行迟延共轭相乘,结合互谱ESPRIT算法无模糊估计出调制斜率。利用调制斜率合成无载频数字信号对后两路通道进行解线调,利用中国余数定理无模糊估计出信号的初始频率值。方法运算量较小,估计精度比较高,易于降低成本和硬件实现。仿真验证了方法的有效性。
Aiming at the problem of parameter estimation of LFM signal under time-domain under-sampling,a new method of modulation slope and initial frequency estimation is proposed.The received signal is divided into three different frequency oversampling channels through the power splitter.The first two channels are delayed conjugate multiplication.The ESPRIT algorithm is used to estimate the modulation slope of the signal.According to the estimated modulation slope,two no carrier frequency digital signal is synthesized to demodulate the last two channels,the initial frequency value of the signal is estimated using the Chinese remainder theorem.The computational complexity of this method is smaller with higher estimation accuracy.It’s easy to reduce cost and hardware implementation.Simulation proves the validity of the algorithm
作者
冯浩然
阮怀林
FENG Hao-ran;RUAN Huai-lin(School of Electronic Countermeasure,National University of Defense Technology,Hefei 230037,China)
出处
《火力与指挥控制》
CSCD
北大核心
2018年第11期138-142,共5页
Fire Control & Command Control
关键词
线性调频信号
时域欠采样
参数估计
中国余数定理
LFMsignal
time domain undersampling
parameter estimation
chinese remainder theorem
