摘要
强散射体线性调频(LFM)信号回波经过脉冲压缩后,旁瓣会遮蔽附近的弱散射目标。针对这一问题,为了在指定的位置获得超低旁瓣,消除强散射体旁瓣对弱散射目标的遮蔽,提出一种旁瓣抑制窗函数求解方法:以指定位置旁瓣强度为目标函数,通过推导目标函数的梯度和Hessian矩阵,求得窗函数的迭代步长,进而通过迭代求得所需的指定位置旁瓣抑制窗函数(SLSS窗)。仿真结果表明,通过该方法求得的窗函数,能够在指定位置获得超低旁瓣,消除强散射体旁瓣对弱散射目标的遮蔽。
Dechirp for LFM echo signal will cause sidelobes,which will mask the weak scattering targets nearby. By suppressing the sidelobes in the specified location with a calculated window function,the sidelobe masking can be eliminated. The sidelobe level in the specified location is used to construct the objective function. By solving the gradient and Hessian Matrix of the objective function,the iterative length and the window function with ultra low sidelobes in the specified location can be acquired. The numerical simulations demonstrate that the proposed method can suppress sidelobe successfully and eliminate the sidelobe masking effectively.
出处
《现代防御技术》
北大核心
2016年第5期161-166,共6页
Modern Defence Technology
关键词
线性调频信号
去斜
旁瓣抑制
迭代
窗函数
弱散射目标
linear frequency modulation signal
dechirp
sidelobe suppressing
iteration
window function
weak scattering targets
