机载高分辨CSSAR地面加速运动目标成像方法

doi:10.12305/j.issn.1001-506X.2024.10.12

Abstract

Abstract:

The airborne circular stripmap synthetic aperture radar (CSSAR) has complex target signal characteristics and significant high-order components of the target range equation due to its circular motion, which brings many difficulties to the imaging of moving targets. Considering that high-resolution is the future development trend, a ground accelerated moving target imaging method is proposed for airborne high-resolution CSSAR. Firstly, to address the issue of significant high-order components in the target range equation, a fourth-order Taylor approximate range model is established to ensure the imaging quality. Next, a two-dimensional frequency-domain signal model of the target is derived, and it is proposed to efficiently achieve target focusing through two-dimensional frequency-domain phase multiplication. The differential evolution algorithm is also used to efficiently achieve accurate search of various parameters of the range model. Finally, the experimental results validate the effectiveness of the proposed method.

Key words: airborne circular stripmap synthetic aperture radar (CSSAR), ground moving target imaging, range equation

CLC Number:

TN951

Yongkang LI, Jirong ZHU, Chenxi YANG. Ground accelerating moving target imaging method for airborne high-resolution CSSAR[J]. Systems Engineering and Electronics, 2024, 46(10): 3347-3355.

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References 30

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系统参数	参数值
雷达平台速度/(m/s)	125
飞行半径/km	2.3
雷达平台高度/km	8
载频/GHz	10
场景中心距离/km	10
采样频率/MHz	360
发射信号带宽/MHz	300
合成孔径时间/s	2.5
脉冲重复频率/Hz	2 000

参数	T1	T2	T3
v_x/(m/s)	-2.0	14.0	-13.0
v_y/(m/s)	4.0	10.0	22.0
a_x/(m/s²)	0.2	-0.4	0.3
a_y/(m/s²)	0.7	-0.5	-0.9
r₀/km	7.9	8.7	8.3

参数	真实值	估计值	绝对误差
l₁	-1.146 9	-1.151 0	0.004 1
l₂	2.755 0	2.749 9	0.000 1
l₃	-0.004 7	-0.004 7	0.000 1
l₄	-0.001 0	-0.000 9	0.000 1

参数	真实值	估计值	绝对误差
l₁	8.745 7	8.755 3	0.009 6
l₂	2.648 3	2.648 2	0.000 1
l₃	0.004 9	-0.004 9	0.000 0
l₄	-0.001 1	-0.001 0	0.000 1

参数	真实值	估计值	绝对误差
l₁	-7.800 0	-7.801 1	0.001 1
l₂	2.663 9	2.663 8	0.000 1
l₃	0.002 1	0.002 1	0.000 0
l₄	-0.000 8	-0.008 1	0.000 1

Ground accelerating moving target imaging method for airborne high-resolution CSSAR

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References 30

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评估指标	维度	T1	T2	T3	理论值
IRW展宽/%	方位向	0.008	0.11	0.099	0.0
IRW展宽/%	距离向	0.000	0.00	0.000	0.0
ISLR/dB	方位向	-10.38	-10.58	-10.58	-10.41
ISLR/dB	距离向	-10.09	-10.08	-10.08	-10.04
PSLR/dB	方位向	-13.29	-13.42	-13.35	-13.26
PSLR/dB	距离向	-13.28	-13.28	-13.28	-13.26