摘要
雷达信号脉内调制方式识别是电子对抗的重要内容。从工程应用的角度,对滤波后的复信号利用改进的相位展开算法,计算瞬时相位、瞬时频率。判断频率跳变点的个数,对时-频曲线进行拟合,根据拟合的参数和信号的时宽带宽积确定信号是否为线性调频-二相编码复合调制信号。再对正确识别的信号进行参数估计,接着重构原线性调频信号,共轭相乘得到基带相位编码信号。最后采用小波变换法提取码速率。仿真结果表明,该算法有很好的识别率和参数估计精度。
Intra-pulse modulated signal recognition is important in electronic warfare.From the angle of practical applications,the signals＇ phase and frequency can be obtained by improved phase unwrapping algorithm.By judging the number of trip points and curving fitting and TB,the modulation system can be confirmed.The signal parameters are estimated.The base-band PN code signal is got with the multiplication of the conjugated reconstructed signal and received signal.Finally the symbol rate of PN is extracted by the wavelet transform approach.Simulation shows that this algorithm has high recognition rate and high accuracy.
出处
《航天电子对抗》
2012年第1期60-64,共5页
Aerospace Electronic Warfare
关键词
调制方式识别
相位展开
伪码调相
参数估计
modulated recognition
phase unwrapping
PN code
parameter estimation.
