对线性调频信号进行拉伸处理已成功应用于宽带数字阵列雷达接收波束形成,但在大阵列孔径条件下,实现任意宽带雷达信号的收发数字波束形成目前仍是难点。文中根据宽带数字阵列雷达的特点和当今数字信号处理器件的发展,通过分析阵列处理误差,综合考虑工程实现复杂度和方法性能,给出了两种基于数字移相与数字延时的时域宽带数字波束形成方法。上述两种方法具有较好的工程可行性,且能够有效克服孔径效应实现任意宽带脉冲信号的收发数字波束形成。通过计算机仿真验证了方法的有效性,并讨论了对方法性能有重要影响的一些因素。

It has been successfully applied to the receiving beamforming of wideband digital array radar(WDAR) using stretch processing to linear frequency modulation (LFM) signal. However, it is still difficult to realize transmitting and receiving digital beamforming(DBF) of any type of wideband radar signal under the condition of large array aperture. According to the characteristics of WDAR and the development of digital signal processors at present, and by analyzing the array processing errors, two wide-band DBF methods in time鄄domain based on digital phase shifting and digital delay are presented after comprehensively considering the realization complexity in engineering and performance of method. The two methods both have relatively good engineering feasibility and can effectively overcome the aperture effect to achieve transmitting and receiving DBF of any wideband pulse radar signal. The effectiveness of the methods is verified by computer simulation and some factors that have a major impact on the performance of the methods are also discussed.