基于准静态法的空间进动锥体HRRP序列快速生成

Rapid Generation of Spatial Precession Cone HRRP Sequence Based on Quasi-static Method

雷达一维高分辨距离像序列生成是研究目标跟踪和识别的重要基础。传统一维距离像序列生成涉及RCS的复杂电磁计算,动态目标的连续多帧距离像生成需要较多的计算资源。基于锥体目标本身具有旋转对称性,目标散射回波不受锥体自旋运动的影响,因此,利用锥体目标散射回波形成的一维距离像形状仅与受重力和进动影响的姿态角有关。进动过程中姿态角呈现周期变化,一维距离像也具有周期性规律。本文采用准静态方法实现了空间进动锥体目标动态一维距离像序列的快速生成,即按照一定步长预先计算出空间锥体在不同姿态角下的电磁散射回波数据,仿真中根据空间锥体运动的姿态角进行插值,并对结果进行逆傅里叶变换可快速得到空间进动锥体的一维距离像序列。结果表明,相同参数下,准静态方法耗时仅为常规方法的2.55%,简单高效地实现了高分辨距离像序列的生成。

High resolution range profile(HRRP)sequence generation of radar target was an important basis for studying target tracking and recognition.The traditional HRRP sequence generation involved the complex electromagnetic calculation of RCS,thus the generation of continuous multi-frame HRRP of dynamic target required more computing resource.Because the cone target had inherent rotational symmetry,the scattered echo was not affected by the spin motion of the cone.Therefore,the cone target scattered echo was only related to the attitude angle affected by gravity and precession.The attitude angle changed periodically during precession,HRRP also had periodicity.Based on such characteristic,this paper adopted the quasi-static method to realize the rapid generation of the dynamic one-dimensional range profile sequence of the space precession cone target.The electromagnetic scattering echo data of the space cone under different attitude angles was pre-calculated according to a certain step size.In the simulation,interpolation was performed according to the attitude angle of the space cone moving,then the inverse Fourier transform was performed on the scattering echo data to quickly obtain the high resolution range profile sequence of the space precession cone.The results showed that in the case of same parameters,the simulation time was only 2.55%of the conventional method.The generation of HRRP sequences can be realized more simply and efficiently.