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对机动目标 ,其散射点回波的多普勒信号是时变的 ,通常其变化是近似线性的 .当目标机动性很强时 ,散射点回波的多普勒信号变化是高阶的 ,必须用高阶多项式近似 ,同时有些散射点回波并不是完整地存在于整个孔径 ,其幅度也是时变的 ,故基于变包络的多分量多项式相位信号模型 ,对机动目标回波进行了成像处理 .通过应用“洁净”技术 ,逐个估计多项式相位信号分量 .各分量的多项式相位系数及幅度分别用基于乘积型高阶模糊度函数的估计方法和低通滤波估计得到 ,机动目标的动态雷达图像由估计的信号重构得到 .实测数据处理结果表明这种成像算法是有效的 .
For the maneuvering target, the Doppler signal of the scatter point echoes is time-varying, and the change is almost linear.When the target maneuvering is strong, the change of the Doppler signal of the echoes of the scattering point is high-order, Must be approximated by high-order polynomials. At the same time, some scatter-point echoes do not exist exactly in the entire aperture and their amplitudes are time-varying. Therefore, the maneuvering target echoes are imaged based on the variable envelope multi-component polynomial phase signal model The polynomial phase coefficients and amplitudes of each component are respectively estimated by the estimation method and low-pass filtering based on the product-type high-order ambiguity function. The dynamic radar image of the maneuvering target Which is obtained from the reconstruction of the estimated signal.The experimental results show that this algorithm is effective.