基于方位向自适应分块的ISAR平动补偿方法&#x0002A;

刘子龙; 李世强

doi:10.7523/j.ucas.2026.008

中国科学院大学学报 >

0 2025071

DOI: https://doi.org/10.7523/j.ucas.2026.008

基于方位向自适应分块的ISAR平动补偿方法^*

刘子龙 ,
李世强

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1 中国科学院空天信息创新研究院,北京,100094;
2 中国科学院大学电子电气与通信工程学院,北京,100049

收稿日期: 2025-11-25

修回日期: 2026-03-06

网络出版日期: 2026-03-06

基金资助

^*科工局民用航天技术预先研究项目(D010105)资助

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ISAR translational motion compensation method based on azimuth partitioning

LIU Zilong ,
LI Shiqiang

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1 Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;
2 School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China

Received date: 2025-11-25

Revised date: 2026-03-06

Online published: 2026-03-06

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摘要

逆合成孔径雷达（inverse synthetic aperture radar, ISAR）成像是观测飞机、卫星等非合作目标的重要手段。传统平动补偿方法通常包含包络对齐和相位调整两个步骤,在远距离、长时间观测条件下,回波信号的幅度和信噪比通常会随时间变化,这会导致补偿性能下降。为此,本文提出一种有效的平动补偿方法,该方法依据回波幅度的二维分布情况沿方位向自适应分块,对包络对齐和相位调整具有不同的分块策略以完成补偿,随后通过方位向包络对齐和最小熵优化的方法补偿子孔径间的线性相位差异和常数相位跳变,实现全孔径的平动补偿。实测数据成像结果验证了所提方法的有效性。

关键词： 自适应分块; 逆合成孔径雷达; 平动补偿; 包络对齐; 相位梯度自聚焦

本文引用格式

刘子龙 , 李世强 . 基于方位向自适应分块的ISAR平动补偿方法^*[J]. 中国科学院大学学报, 0 : 2025071 . DOI: 10.7523/j.ucas.2026.008

Abstract

Inverse synthetic aperture radar (ISAR) imaging is an important technique for observing non-cooperative targets such as aircraft and satellites. Traditional translational motion compensation methods typically consist of envelope alignment and phase adjustment. However, under long-range and long-duration observation conditions, the echo amplitude and signal-to-noise ratio usually vary over time, leading to degraded compensation performance. To address this issue, this paper proposes an effective translational motion compensation method that adaptively segments the azimuth dimension based on the two-dimensional distribution of echo amplitude. Different segmentation strategies are employed for envelope alignment and phase adjustment, and motion compensation is performed within each sub-aperture. Subsequently, azimuthal envelope alignment and minimum-entropy optimization are used to correct linear and constant phase offsets between sub-apertures, thereby completing sub-block stitching and achieving full-aperture motion compensation. Experimental results on real data verify the effectiveness of the proposed method.

Key words： adaptive partitioning; inverse synthetic aperture radar; translational motion compensation; envelope alignment; phase gradient autofocus

参考文献

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