利用目标上机会照射源的无源斜视InISAR三维成像

doi:10.7527/S1000-6893.2024.30982

Abstract

Abstract:

Passive radar has the advantages such as anti-interference， good concealment， low cost， etc. Compared to other passive radar system configurations， the passive radar technology that utilizes the target-borne Illuminator of Opportunity （IO） has stronger reflection signals due to closer distance between the target and the IO， making it easier to achieve target detection. So far， the passive ISAR imaging using-target borne IO has been extended to 3D InISAR imaging. However， when InISAR imaging operates in the squint-looking mode， the obtained 3D images will be distorted， and accurate 3D reconstruction results cannot be obtained. To solve this problem， a passive InISAR 3D imaging method that is suitable for the squint-looking mode is proposed. Coordinate transformation and Nonlinear Least Squares （NLS） are used to estimate the target’s 3D coordinate information in the imaging coordinate system from the distance information of the 2D ISAR image and the interferometric phases that both contain the target’s 3D coordinate information. Afterwards， coordinate transformation is performed again to obtain the 3D coordinate information of the target in the target body coordinate system， achieving 3D reconstruction of the target without squint-looking distortion. Simulation experiments verify the effectiveness of the proposed passive squint InISAR 3D imaging method， which can achieve correction of squint-looking distortion.

Key words: Inverse Synthetic Aperture Radar (ISAR), Interferometric Inverse Synthetic Aperture Radar (InISAR), 3D imaging, passive radar, squint-looking

CLC Number:

V243.2

Jianing JIN, Ling WANG, Rui GONG, Daiyin ZHU. 3D imaging of passive squint InISAR using target-borne illuminator of opportunity[J]. Acta Aeronautica et Astronautica Sinica, 2025, 46(8): 330982.

Figures/Tables 21

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参数	数值
工作波长λ/m	0.02
发射信号带宽B/MHz	900
脉冲宽度T_P/μs	1
成像时间T_obs/s	1.024
基线长度L/m	2
总转动角速度ω_total/（rad·s^-1）	0.05

仿真情况	X₀/km	Y₀/km	Z₀/km
正视	0	5	0
小斜视	2	5	2
大斜视	5	5	5

情况	E_x /m	E_y /m	E_z /m	E_3d/m
正视（姿态1）	0.058 3	0.274 3	0.176 9	0.229 9
小斜视（姿态1）	0.149 1	0.336 6	0.111 8	0.185 0
大斜视（姿态1）	0.283 3	0.257 2	0.235 3	0.269 7
正视（姿态2）	0.064 6	0.188 6	0.085 2	0.153 4
小斜视（姿态2）	0.066 1	0.157 9	0.201 0	0.207 0
大斜视（姿态2）	0.377 5	0.345 5	0.347 5	0.326 7

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3D imaging of passive squint InISAR using target-borne illuminator of opportunity

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