摘要
针对小型化空间目标探测雷达发射功率小,目标可探测性低的问题,提出了一种适用于小型化空间目标探测雷达的弱目标检测方法。首先对去斜脉压后的目标回波进行了分析,然后通过二阶Keystone变换去除距离弯曲,并用匹配估计的方法估计加速度以补偿二次项相位,接着再次运用二阶Keystone变换校正距离走动,最后对多个脉冲回波作长时间积累,从而提高信噪比,实现弱目标检测。此外,采用相参积累时间捷变的快速搜索方法,在不同探测距离段选用不同的积累时间进行积累。通过仿真分析,验证了该方法的有效性,并比较了sinc内插和CZT-IFFT 2种二阶Keystone变换实现方法的仿真结果和运算速度。
Aiming at the problem of small transmitting power and low target detectability of miniaturized space target detection radar,a weak target detection method suitable for miniaturized space target detection radar is proposed.Firstly,analyzing the received pluses which are dechirped.Secondly,applying the second-order Keystone transform to eliminate the range curvature,then the quadratic term of slow time is removed by estimating the acceleration of the target.Next,using the second-order Keystone transform again to compensate for the residual range walk.At the end,long time integration is performed for weak target detection,thus the signal to noise ratio is improved.In addition,a fast searching method of phase-coherent accumulation time agility is used to select different accumulation time in different detection ranges.Simulation analysis shows that the effectiveness of the proposed method is verified,and the simulation results and operation speed of two second-order Keystone transformation methods,sinc interpolation and CZT-IFFT are compared.
作者
陈睿容
孙武
贾学振
徐秋锋
CHEN Rui-rong;SUN Wu;JIA Xue-zhen;XU Qiu-feng(Beijing Institute of Remote Sensing Equipment,Beijing 100854,China)
出处
《现代防御技术》
2020年第4期93-101,共9页
Modern Defence Technology
关键词
弱目标检测
长时间积累
二阶Keystone
加速度估计
去斜脉压
快速搜索
weak target detection
long time integration
second-order Keystone transform
accele-ration estimating
dechirp pulse compression
fast searching
