根据雷达制导空空导弹的特点及其雷达回波信号中速度、加速度等特征建立的回波信号数学模型,对雷达回波的频域数据作了尖峰阻隔处理。利用分数阶傅里叶变换对线性调频信号有很好的聚焦性的性质,提出了基于傅里叶变换的导弹信号检测与参数估计算法,解决了在强分量信号中检测和估计弱分量LFM信号的问题。仿真结果表明了该算法能够实现对导弹发射的早期告警。

According to the features of air-to-air missile with radar seeker and the characteristics of velocity and acceleration in radar echoes, the mathematical model of missile target echo signal was established. The frequency domain masking technique was adopted to mask the peak fields of the radar echo's Fourier transform data. Based on the focus of LFM signals, the signal's detection and parameter estimation of missiles based on FRFT were presented to detect and estimate weak component LFM signals from strong component signals. The algorithm was verified can imply a reliable early warning of missile launching.