一种数字阵列雷达小视场快速成像方法

Fast Imaging Method for Digital Array Radar with Small Field of View

针对通道幅相误差和RCM(距离单元徙动)幅相误差同时出现导致数字阵列雷达近程成像效果不佳的问题,研究了一种在小视场条件下快速实现数字阵列雷达近程成像的方法。通过研究数字阵列雷达的回波信号模型,确定了DBF(数字波束合成)成像中幅相误差的来源,在此基础上,建立了数字阵列雷达小视场成像的快速DBF成像模型。理论仿真和实测数据表明:该方法在校准通道幅相误差时能有效实现RCM幅相误差的补偿,通过单次FFT(快速傅里叶变换)即可实现DBF成像。与现有小视场成像方法相比,该方法能在保证成像质量的前提下,显著提高成像效率,在系统性能评估测试等小视场应用中具有较好的应用前景。

For solving the problem that the imaging quality and efficiency of digital array radar are influenced by channel amplitude-phase error and range cell migration amplitude-phase error,a fast short-range imaging method for the digital array radar with small field of view is proposed in this paper.By studying digital array radar echo signal models,the sources of amplitude and phase errors in DBF imaging are determined.Based on this,a fast DBF imaging model and a small field-of-view imaging method are presented.The amplitude-phase error and range migration amplitude-phase error can be calibrated in the same time,and the DBF imaging can be realized by a single fast Fourier transform.Theoretical simulation and experimental data verify the effectiveness of the proposed method.This method can significantly improve imaging efficiency without sacrificing imaging quality,showing a broad prospect for application.