SAR距离卷积方位乘积调制场景欺骗干扰方法

doi:10.7527/S1000-6893.2022.28235

Abstract

Abstract:

To reduce the real-time computational amount and requirement for reconnaissance parameters and maintain the fidelity of false scenes in Synthetic Aperture Radar （SAR） scene deceptive jamming， this paper first proposes a fast implementation method of SAR azimuth multiplication modulation jamming. Through a reasonable approximation of the slant distance from the SAR sensor to the target point， SAR azimuth multiplication modulation jamming is able to be used in combination with SAR range convolution modulation jamming for jamming SAR. On this basis， a SAR scene deceptive jamming method is proposed based on range convolution and azimuth multiplication modulation. Based on the two-dimensional Fourier transform of the spoofing template， this method constructs a series of slow-time frequency domain response functions before jamming， and then obtains the jamming modulated signal by real-time resampling in the azimuth direction， which can significantly reduce the computational effort and the demand for reconnaissance parameters， and at the same time maintain the fidelity of the false target. The method is also able to jam the complex waveform SAR due to the use of convolutional modulation in the range direction. Theoretical analysis and simulation experiments verify the effectiveness of the proposed method.

Key words: synthetic aperture radar (SAR), scene deceptive jamming, convolution modulation, multiplication modulation, deceptive template

CLC Number:

V243.2

Penghui JI, Shiqi XING, Dahai DAI, Bo Pang, Dejun FENG. A SAR scene deceptive jamming method based on range convolution and azimuth multiplication modulation[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(18): 328235-328235.

Figures/Tables 15

Fig.1

Fig.2

Table 1

Parameters required by different algorithms

方法	离线阶段所需参数	实时调制阶段所需参数
两步生成方法	$r J, λ$	$V a$
频域三阶段方法	所有参数	无
二维乘积调制干扰方法	无	$B r, V a, r J, λ$
本文方法	无	$V a, r J, λ$

Table 1

Table 2

Comparison of computational complexity of different algorithms

方法	计算复杂度	浮点运算量
两步生成方法	$O P a N r + O N r + O N r l o g 2 N r$	$6 P a N r + 6 N r + 10 N r l o g 2 N r$
频域三阶段方法	$O P r 0 N a M k e r + O N a N r M k e r + O N r N a l o g 2 N a + O N a N r l o g 2 N r + O N r + O N r l o g 2 N r$	$6 P r 0 N a (2 M k e r - 1) + 6 N a N r (2 M k e r - 1) + 5 N r N a l o g 2 N a + 5 N a N r l o g 2 N r + 6 N r + 10 N r l o g 2 N r$
二维乘积调制干扰方法	$O N r$	$6 N r$
本文方法	$O N r + O N r l o g 2 N r$	$6 N r + 10 N r l o g 2 N r$

Table 2

Table 3

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Table 4

Table 5

Fig.9

Table 6

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参数	数值
载频/GHz	10
带宽/MHz	50
平台速度/（m·s^-1）	7 000
采样频率/MHz	70
脉冲重频/Hz	3 267
成像中心斜距/km	850
波束宽度/rad	0.005

方法	欺骗模板	频域三阶段方法	两步生成方法	二维乘积调制干扰方法	本文方法
ENL	1.536 2	1.608 9	1.675 4	2.150 4	1.790 0
SSIM	1	0.988 4	0.922 9	0.773 7	0.887 2
PSNR	∞	27.085 4	19.354 6	13.147 5	17.447 2
Correlation	1	0.988 8	0.932 9	0.869 5	0.911 2

模板大小	两步生成方法耗时/ms	频域三阶段方法耗时/s	二维乘积调制干扰方法耗时/μs	本文方法耗时/μs
300×300	38.61	38.82	9.42	56.4
500×500	47.82	39.26	8.83	56.6
700×700	56.15	40.03	9.25	57.8
900×900	62.03	38.94	8.77	56.2
1 000×1 000	65.82	39.68	9.35	55.8
1 200×1 200	71.92	40.14	8.79	57.9

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A SAR scene deceptive jamming method based on range convolution and azimuth multiplication modulation

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