双基前视雷达二维空变补偿频域成像方法

doi:10.12305/j.issn.1001-506X.2023.07.09

系统工程与电子技术 ›› 2023, Vol. 45 ›› Issue (7): 1990-2001.doi: 10.12305/j.issn.1001-506X.2023.07.09

双基前视雷达二维空变补偿频域成像方法

王鹏飞¹^,², 詹珩艺³^,*, 孙洪忠²

1. 电子科技大学信息与通信工程学院, 四川成都 611731
2. 中国空空导弹研究院, 河南洛阳 471000
3. 西安电子科技大学雷达信号处理国家重点实验室, 陕西西安 710071

收稿日期:2022-02-16 出版日期:2023-06-30 发布日期:2023-07-11
通讯作者: 詹珩艺
作者简介:王鹏飞(1982—), 男, 研究员, 硕士, 主要研究方向为合成孔径雷达成像
詹珩艺(1997—), 女, 硕士研究生, 主要研究方向为合成孔径雷达成像及定位
孙洪忠(1968—), 男, 研究员, 硕士, 主要研究方向为合成孔径雷达成像
基金资助:
科技部重点研发计划(2018YFB2202500);国家自然科学基金(62171337);国家自然科学基金(62101396);陕西省重点研发计划(2017KW-ZD-12);陕西省杰出青年科学基金(S2020-JC-JQ-0056);中央高校基本科研业务费专项资金(XJS212205)

Two-dimensional spatial-variant compensation frequency domain imaging method for bistatic forward-looking radar

Pengfei WANG¹^,², Hengyi ZHAN³^,*, Hongzhong SUN²

1. School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
2. China Airborne Missile Academy, Luoyang 471000, China
3. National Key Laboratory of Radar Signal Processing, Xidian University, Xi'an 710071, China

Received:2022-02-16 Online:2023-06-30 Published:2023-07-11
Contact: Hengyi ZHAN

摘要/Abstract

摘要：

机载双基前视雷达在距离宽幅和长合成孔径时间积累情况下, 存在回波多普勒参数的强耦合和强二维空变问题。针对这个问题, 提出了一种基于二维空变量级补偿的成像方法。该方法以Chebyshev正交多项式的最佳一致逼近特性为手段, 实现斜距历程的高精度近似和二维频谱的高质量解耦合, 采用Keystone变换校正空变的线性距离走动。在此基础上, 定量分析多普勒参数的二维空变量级, 以π/4相位门限为标准, 使用最小二乘拟合算法, 设计适用于空变量级的二维空变校正函数, 提出方位向扩展的非线性变标成像方法, 精确且高效地实现不同空变量级多普勒参数的校正。点目标仿真和实测数据处理结果表明, 所提成像方法具有良好的聚焦性能。

关键词: 合成孔径雷达, 距离宽幅, 长合成孔径时间, 二维空变, 双基前视成像

Abstract:

To solve the problem of the strong 2D spatial-variant of echo Doppler parameters in the airborne bistatic forward-looking radar under the condition of wide-swath and long synthetic aperture time, a 2D spatial-variant order compensation imaging method is proposed. Based on the best uniform approximation characteristics of Chebyshev orthogonal polynomials, the high-precision approximation of slant-distance and the high-quality decoupling of 2D spectrum is realized, then the spatial-variant linear range cell migration(LRCM) is corrected by Keystone transform. On this basis, the 2D spatial-variant order of Doppler parameters is quantitatively analyzed. Taking π/4 phase threshold as the standard, the 2D spatial-variant correction function suitable for the spatial-variant order is designed by using the least square fitting algorithm, and the azimuth extended nonlinear chirp scaling accuracy imaging method is proposed to accurately and efficiently correct the Doppler parameters of different spatial-variant order. The results of point target simulation and real data processing verify the good focusing performance of the proposed method.

Key words: synthetic aperture radar (SAR), range wide-swath, long synthetic aperture time, 2D spatial-variant, bistatic forward-looking imaging

中图分类号:

TN957

王鹏飞, 詹珩艺, 孙洪忠. 双基前视雷达二维空变补偿频域成像方法[J]. 系统工程与电子技术, 2023, 45(7): 1990-2001.

Pengfei WANG, Hengyi ZHAN, Hongzhong SUN. Two-dimensional spatial-variant compensation frequency domain imaging method for bistatic forward-looking radar[J]. Systems Engineering and Electronics, 2023, 45(7): 1990-2001.

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参考文献 24

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类型	名称	值
雷达系统参数	脉宽/μs	2
	带宽/MHz	180
	载频/GHz	11
	PRF/Hz	2 000
	采样频率/MHz	350
雷达运动参数	合成孔径时间/s	4
	场景中心点/m	(0, 0, 0)
	接收雷达起始坐标/m	(0, -11 000, 6 000)
	发射雷达起始坐标/m	(-11 000, -400, 5 000)
	接收雷达速度/(m/s)	(0, 280, -40)
	发射雷达速度/(m/s)	(-83, 100, -40)
	接收雷达加速度/(m/s²)	(0, -5, 2)
	发射雷达加速度/(m/s²)	(1, -4, 1)

成像方法	点目标	距离向		方位向
成像方法	点目标	峰值旁瓣比	积分旁瓣比	峰值旁瓣比	积分旁瓣比
文献[18]	P₁	-13.04	-10.06	-11.72	-7.16
	P₂	-13.26	-10.03	-13.23	-9.59
	P₃	-13.01	-10.32	-8.72	-5.58
本文	P₁	-13.26	-11.19	-13.18	-9.75
	P₂	-13.26	-11.19	-13.26	-9.76
	P₃	-13.26	-11.19	-13.19	-9.79

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双基前视雷达二维空变补偿频域成像方法

Two-dimensional spatial-variant compensation frequency domain imaging method for bistatic forward-looking radar

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