摘要
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。
Conventional narrowband beamforming methods are not applicable in the multiple channels of a broadband array since the envelope difference cannot be neglected. Keystone transforms are a range alignment method that is used widely in radar imaging and long time target integration. This paper presents a broadband beamforming method based on keystone transform pre-processing, with both a theoretical derivation and simulation results. This method more accurately controls the sidelobe level than common methods such as frequency bin partitioning and fractional-delay filters. The method also has better interference suppression and better results in simultaneous multi-broadband beam scenarios.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第7期991-994,1000,共5页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金面上项目(61171120)
总装备部重点预研基金项目(9140A07020212JW0101)
