高速俯冲三维线阵合成孔径雷达空变相位补偿及聚焦处理

刘璨; 谭鸽伟

doi:10.12382/bgxb.2024.0596

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高速俯冲三维线阵合成孔径雷达空变相位补偿及聚焦处理

更新时间：2025-09-05

- 高速俯冲三维线阵合成孔径雷达空变相位补偿及聚焦处理
- Space-variant Phase Compensation and Focusing Processing of High-speed Diving 3D Linear Array SAR
- 兵工学报 2025年46卷第6期页码：240596
- 作者机构：
  
  华侨大学信息科学与工程学院, 福建厦门 361021
- 作者简介：
  
  *邮箱:tangewei70@163.com
- 基金信息：
  
  华侨大学高层次人才科研项目(10BS312)
- DOI：10.12382/bgxb.2024.0596
  中图分类号：
- 收稿：2024-07-18，
  
  网络出版：2025-06-28，
  
  纸质出版：2025-06-10
- 稿件说明：
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刘璨, 谭鸽伟. 高速俯冲三维线阵合成孔径雷达空变相位补偿及聚焦处理[J]. 兵工学报, 2025,46(6):240596.

Can LIU, Gewei TAN. Space-variant Phase Compensation and Focusing Processing of High-speed Diving 3D Linear Array SAR[J]. Acta Armamentarii, 2025, 46(6): 240596.
刘璨, 谭鸽伟. 高速俯冲三维线阵合成孔径雷达空变相位补偿及聚焦处理[J]. 兵工学报, 2025,46(6):240596. DOI： 10.12382/bgxb.2024.0596.

Can LIU, Gewei TAN. Space-variant Phase Compensation and Focusing Processing of High-speed Diving 3D Linear Array SAR[J]. Acta Armamentarii, 2025, 46(6): 240596. DOI： 10.12382/bgxb.2024.0596.

摘要

三维线阵合成孔径雷达(Synthetic Aperture Radar

SAR)与高速平台相结合

可实现极限场景下的成像。但要完成该体制下的SAR成像

要克服因其高速度、大加速度所带来的更复杂的距离徙动和空变特性。提出适用于高速平台三维线阵SAR的回波信号模型及斜距模型

并利用隐函数求导的方法实现对三维频谱的求取。为了均衡方位向及跨航向空变调制相位

利用最小二乘拟合方法进行方位向和跨航向的二维重采样操作

完成对该两个维度上空变相位误差的补偿。研究结果表明

新提出的基于最小二乘拟合的补偿算法能有效去除空变相位误差对成像的影响

提高了在高速场景下三维线阵SAR的成像性能

仿真实验验证了新算法的有效性。

Abstract

The combination of 3D linear array synthetic aperture radar (SAR) and high-speed platform can achieve imaging in extreme scenarios.To achieve imaging under this SAR system with high-speed platform

it is necessary to overcome the more complex range migration and space-variant characteristics caused by high speed and large acceleration.This paper proposes an echo signal model and a slant range model suitable for 3D linear array SAR on high-speed platform

and uses the implicit function derivation method to achieve the acquisition of 3D frequency spectrum.To balance the azimuth and cross-track space-variant modulated phases

the least squares fitting method is employed for two-dimensional resampling operations in the azimuth and cross-track directions for completing the compensation for space-variant phase errors in these two dimensions.The proposed compensation algorithm based on least squares fitting can effectively eliminates the impact of space-variant phase errors on imaging

thereby enhancing the imaging performance of 3D linear array SAR in high-speed scenarios.Finally

the effectiveness of the proposed algorithm is verified through simulation experiment.

关键词

Keywords

references

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徐熙毅 , 谭鸽伟 , 李彪 . 基于空变分离的两步聚焦双基曲线合成孔径雷达成像 [J ] . 兵工学报 , 2022 , 43 ( 6 ): 1365 - 1375 . DOI: 10.12382/bgxb.2021.0398 http://doi.org/10.12382/bgxb.2021.0398 针对任意构型曲线运动轨迹双基SAR严重的二维空变问题，建立斜距的空变分离等效模型，并在此基础上提出一种两步聚焦处理方法。在距离频域-方位时域对回波进行非空变相位补偿，以完成距离走动矫正和Deramp处理，实现粗聚焦。第一步聚焦后的剩余相位是与点目标位置有关的空变部分，接着在距离向引入Keystone变换，并在方位向通过多普勒参数的最小二乘拟合和方位重采样较好地补偿空变相位误差，完成精确聚焦。仿真结果表明：所提空变分离的斜距等效模型具有较高的精确性；两步聚焦处理算法有效地解决了曲线双基合成孔径雷达的二维空变和强耦合问题，提高了边缘点的成像性能，具有较大的成像区域和较广的使用场景。

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