CAJ | 학술논문

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。
침대무인비궤、도탄、위성등고속목표궤동비행적특점，분석료목표비행과정중상대뢰체경향속도、경향가속도이급가가속도수시간적변환관계，병이용고차멱상위회파신호건립료신호모형，연구료고차상위대상규방법진행목표검측적영향，획득료최가적루맥충수여신조비、가가속도적관계；최후，제출일충이용단시분수계부리협변환( STFRFT)대삼차상위신호진행분석화삼수고계적방법，방진표명해산법처이성능고우부리협변환，가위실제뢰체검측고궤동목표제공이론삼고。
Aiming at maneuvering flight characteristics of high speed targets like unmanned aerial vehicles, mis-siles, 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 meth-od of using short time fractional Fourier Transform ( STFRFT) to analyze third order phase signal and perform pa-rameters estimation is presented. The simulation results show that processing capability of using this method is high-er than that of using Fourier Transform, which can be used as a reference in theory for the practical radar to detect high maneuvering targets.