【摘要】 针对无人飞机、导弹、卫星等高速目标机动飞行的特点,分析了目标飞行过程中相对雷达径向速度、径向加速度以及加加速度随时间的变换关系,并利用高次幂相位回波信号建立了信号模型,研究了高次相位对常规方法进行目标检测的影响,获得了最佳积累脉冲数与信噪比、加加速度的关系;最后,提出一种利用短时分数阶傅里叶变换(STFRFT)对三次相位信号进行分析和参数估计的方法,仿真表明该算法处理性能高于傅里叶变换,可为实际雷达检测高机动目标提供理论参考。更多还原

【Abstract】 Aiming at maneuvering flight characteristics of high speed targets like unmanned aerial vehicles,missiles,satellites and so on,the transform relationship of target relative to radar radial velocity,radial acceleration,and jerk as time during target flying is analyzed; and signal model is set up by using high- order power phase echo signal; and then the impact of using high order phase on target detection by using conventional method is studied;the relation of optimum accumulation pulses and signal- to- noise ratio and jerk is obtained. And finally,a method of using short time fractional Fourier Transform( STFRFT) to analyze third order phase signal and perform parameters estimation is presented. The simulation results show that processing capability of using this method is higher than that of using Fourier Transform,which can be used as a reference in theory for the practical radar to detect high maneuvering targets.更多还原