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对于宽带阵列而言,各通道信号复包络之间的相对延时不能忽略是造成窄带波束形成方法无法直接应用的根本原因,keystone变换是一种广泛应用于雷达成像和目标长时间积累中的包络对齐技术,该文提出一种基于keystone变换预处理的宽带波束形成方法,给出了理论推导和仿真结果。与频率柜分割、分数延时滤波器等常用方法相比,该方法能够精确地控制旁瓣电平,在抑制空间干扰及同时形成多宽带波束的应用场景下也具有一定的优势。
For wideband arrays, the relative delay between signal envelops of each channel can not be neglected, which is the fundamental reason that narrowband beamforming method can not be applied directly. Keystone transform is a widely used method for radar imaging and target long-term accumulation Envelope alignment technology, this paper presents a broadband beamforming method based on keystone transform preprocessing, and gives the theoretical derivation and simulation results. Compared with the commonly used methods such as frequency counter division and fractional delay filter, this method can control the sidelobe level accurately and has certain advantages under the application scenarios of suppressing space interference and forming multiple broadband beams at the same time.