摘要
雷达信号脉内调制方式识别是电子对抗的重要内容。在实信号进行正交变换的过程中通过频域滤波来滤除带外噪声,提高信噪比,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,然后对得到的瞬时相位曲线进行三次多项式拟合,根据拟合离差、拟合参数来自动识别常规信号、线性调频信号和三次多项式相位信号,并在正确识别调制方式的基础上进行参数估计。计算机仿真表明,本方法在信噪比不小于0dB的条件下,正确识别率达90%以上,且参数估计的精度较高。
Intra-pulse modulated signal recognition is important in electronic warfare （EW）. Filtering by a sliding window in the process of orthogonal transformation can remove the out- of-band noise and improve the signal-to-noise ratio （SNR）. Then the phase of signals can be obtained by the improved phase unwrapping algorithm, thus automatically recognizing the nor- mal signal, the linear frequency modulation signal and the three-order polynomial phase signal by fitting the curve of instantaneous phase, and estimating the parameters. The simulation re- sults show that the recognition rate is greater than 90% and the precision of parameters estimation is high enough when SNR is not less than 0 dB.
出处
《数据采集与处理》
CSCD
北大核心
2011年第5期615-618,共4页
Journal of Data Acquisition and Processing
关键词
脉内调制识别
相位展开
曲线拟合
频域滤波
intra-pulse modulated recognition
phase unwrapping
curve fitting filtering in frequency-domain
