基于速度合成孔径雷达的海面舰船动目标成像方法

doi:10.3969/j.issn.1001-506X.2020.01.07

Abstract

Abstract:

Surface ship imaging technology is widely used in military and civilian applications. To resolve the problem of imaging target positioning blur on sea surface, this paper proposes a method for estimating the velocity of the moving target using velocity synthetic aperture radar (VSAR). Firstly, this paper analyzes the imaging mechanism and constraints of the VSAR method, and establishes an imaging model based on phased array radar for surface ships. Then, the rate-frequency estimation method of the multi-antenna image domain is used to correct the azimuth offset, and the image moisture algorithm is used to complete the adaptive focusing of the target image.Finally, this method is used to simulate the moving ship on the sea. The simulation results show that VSAR can identify the type of target and judge the moving trend and trajectory of the moving target when dealing with the simultaneous existence of static and dynamic targets on the sea surface in large sea areas. Compared with the traditional single-channel SAR and the along track interferometer algorithm, the rate-frequency estimation algorithm solves the shortcomings of the azimuth positioning accuracy, and improves the positioning performance of the moving ship under large-area sea conditions, and has good application prospects.

Key words: phased array radar, velocity synthetic aperture radar (VSAR), ship moving target, sea surface

CLC Number:

TN957.51

Lin ZHANG, Yicheng JIANG. Imaging of moving surface ships based on velocity synthetic aperture radar[J]. Systems Engineering and Electronics, 2020, 42(1): 45-51.

Figures/Tables 9

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References 25

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参数	参数值
载频/GHz	1.5
场景中心斜距/km	3
载机速度/(m/s)	300
相控阵天线数	10
天线间距/m	0.6
PRF/Hz	600
发射脉宽/μs	1.5
发射带宽/MHz	150
A/D采样率/MHz	300
舰船初始坐标(X, Y)	(10, 50)
舰船径向速度/(m/s)	6
舰船航向速度/(m/s)	20

算法	公式	定位精度/%
DPCA	$\Delta {f_{dc}} = - \frac{2}{\lambda }{V_r}\;\Delta x = - \frac{{{V_r}}}{V}{R_0}$	94~95
ATI	${\Delta _\phi } = \frac{{2{\rm{ \mathsf{ π} }}}}{\lambda } \cdot 2{V_r}T\;\Delta x = \frac{{{V_r}}}{V}{R_0}$	90~93
VSAR	${\Delta _{{\rm{shift}}}} = - \frac{{\lambda {R_0}}}{d} \cdot {f_v}$	96~97.5

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Imaging of moving surface ships based on velocity synthetic aperture radar

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