基于OFDM-LFM的弹载广域SAR成像距离模糊抑制

doi:10.12305/j.issn.1001-506X.2021.02.11

Abstract

Abstract:

Wide area imaging of medium and large ship targets with the high trajectory altitude and high maneuvering speed of high ballistic missile-borne synthetic aperture radar(SAR) make the image easily producing multi-range ambiguity and the image quality deteriorates seriously. In order to solve this problem, a orthogonal waveform design scheme based on orthogonal frequency division multiplexing-linear frequency modulation (OFDM-LFM) signal is proposed, the scheme uses Bernulli mapping chaotic modulation sequence to carry out frequency modulation of the OFDM-LFM signal base, the cross-correlation peak level and autocorrelation peak sidelobe level of signal are reduced, and the orthogonality among the transmitting pulses is further improved. The modulation method can generate multiple orthogonal waveforms to solve the problem of multiple distance ambiguity. The simulation results of the target imaging show that the OFDM-LFM signal modulated by chaotic sequence can effectively suppress the range ambiguity of the missile-borne SAR wide area imaging.

Key words: wide area synthetic aperture radar(SAR) imaging, range ambiguity, orthogonal frequency division multiplexing-linear frequency modulation (OFDM-LFM) signal, chaotic sequence modulation

CLC Number:

TN958.3

Yuting BAO, Fei CAO, Kunpeng ZHANG, Bichao ZHAN, Junyi LI, Jianwei ZHAN. Range ambiguity suppression of the missile-borne SAR wide area imaging based on OFDM-LFM[J]. Systems Engineering and Electronics, 2021, 43(2): 369-375.

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References 17

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信号码元	p_nm	q_nm
a1	{1 8 5 2 1 4 5 6}	{-1-1 1 1 1-1-1 1}
a2	{5 0 7 2 3 6 7 2}	{-1 1-1-1 1-11 1 }
a3	{(4 6)(0 3)(2 6)(0 4) (2 7)(1 5)(3 7)(1 5)}	{(1 1)(1 1)(1 1)(1 1) (1 1)(1 1)(1 1)(1 1)}
a4	{(1 7)(2 6)(1 5)(2 8) (1 5)(4 6)(1 5)(4 6)}	{(-1 1)(1-1)(-1-1)(1-1) (1-1)(-1 1)(1 1)(-1 1)}

信号码元	p_nm	q_nm
b1	{0 1 5 3 7 4 2 6}	{1-1 1-1 1-1 1-1}
b2	{2 3 7 6 5 4 0 1}	{-1 1-1 1-1 1-1 1 }
b3	{(7 5)(5 3)(0 0)(2 2) (4 7)(6 6)(1 4)(3 1)}	{(1 1)(-1-1)(1 1)(-1-1) (1 1)(-1-1)(1 1)(-1-1)}
b4	{(5 4)(3 1)(0 7)(2 6) (7 5)(6 2)(4 0)(1 3)}	{(-1-1)(1 1)(-1-1)(1 1) (-1-1)(1 1)(-1-1)(1 1)}

电平	传统信号	电平值/dB	改进信号	电平值/dB
APSL	a1和a1	-34.23	b1和b1	-32.28
APSL	a3和a3	-8.52	b3和b3	-26.85
CPL	a1和a2	-18.06	b1和b2	-32.24
CPL	a3和a4	-10.59	b3和b4	-26.84

成像参数	仿真数值
信号载频/Hz	1.6×10¹⁰
脉冲时宽/s	2.5×10^-6
波束斜视角/(°)	4.9
有效速度/(m/s)	1 800
距离调频率/(Hz/s)	20×10¹²
脉冲带宽/Hz	5×10⁷
天线孔径/m	0.5
-	-

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Range ambiguity suppression of the missile-borne SAR wide area imaging based on OFDM-LFM

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