中国科学院大学学报2025，Vol.42Issue(6)：781-791,11.DOI:10.7523/j.ucas.2024.013
一种改进的面向星上处理的SAR俯仰向多零点数字波束实时形成技术
An improved on-satellite-processing real-time digital formation technique of multi-zero beams for satellite-based SAR in elevation
摘要
Abstract
The echoes of the nadir and the range ambiguity point will degrade the quality of high-resolution wide mapping band satellite-based synthetic aperture radar(SAR)imaging,and the use of digital beam forming(DBF)can make the antenna directional map to form a null in the corresponding direction for suppression.It is difficult to implement the existing multi-zero-points DBF processing technology on the satellite.In order to engineer DBF-SAR imaging technology,this paper proposes a set of improved engineering-achievable real-time multi-zero DBF processing method in elevation,which weights the echo signals in real time,and solves the inverse line velocity matrix problem faced in the real-time multi-zero weight generation by using the LDLT decomposition iteration to inhibit the Nadir echoes and range ambiguity in order to increase the range of the wave-position selection.The effectiveness of this real-time processing scheme is verified by multi-point target simulation.关键词
合成孔径雷达/数字波束形成/实时处理/零点指向/距离模糊抑制Key words
SAR/digital beam-forming(DBF)/real-time processing/null steering/range ambiguity suppression分类
信息技术与安全科学引用本文复制引用
崔泽楷,肖灯军,邱劲松..一种改进的面向星上处理的SAR俯仰向多零点数字波束实时形成技术[J].中国科学院大学学报,2025,42(6):781-791,11.基金项目
国家重点研发计划(2023YFB3904901)资助 （2023YFB3904901）
