一种基于循环自相关分析的雷达编队目标架次估计

Radar target detection in the formation based on cyclostationarity and FRFT

在研究编队目标回波多普勒频率变化的基础上,提出一种基于循环自相关分析的编队目标架次估计新方法。该方法利用编队目标回波可近似看作多个频率相近、幅度恒定、调频系数相等的LFM信号叠加的特点,采用循环自相关估计回波信号的调频系数,再利用分数阶傅立叶变换对编队目标架次进行估计。该方法计算简单,易于工程实现,相对Fourier变换和WVD具有较高的分辨能力。实测数据实验表明了方法的有效性,实现了较短数据长度下的雷达编队目标架次的有效估计。

This paper deals with the Doppler frequency of radar target in formation.A radar target number estimation method based on cyclostationairy analysis is proposed.The radar echoes of formation targets usually approximate the sum of multiple linear frequency modulation（LFM） signals with constant amplitude and equal FM coefficient.Therefore,the cyclostationairy analysis is utilized to estimate the FM coefficient.Then,the fractional Fourier transform（FRFT） is used to estimate the target number.This method is simple in computation and easy in engineering implement.Moreover,this method has higher resolution ability than Fourier transform and WVD.Experimental result on actual echoes illustrate the effectiveness of the method,and reliable estimation of targets number under short data.