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

系统工程与电子技术 ›› 2021, Vol. 43 ›› Issue (2): 369-375.doi: 10.12305/j.issn.1001-506X.2021.02.11

基于OFDM-LFM的弹载广域SAR成像距离模糊抑制

鲍雨婷^1,²(), 曹菲¹(), 张鹍鹏²(), 占必超²(), 李君宜²(), 占建伟¹()

1. 火箭军工程大学核工程学院, 陕西西安 710025
2. 北京遥感设备研究所, 北京 100854

收稿日期:2020-06-11 出版日期:2021-02-01 发布日期:2021-03-16
作者简介:鲍雨婷(1996-),女,硕士研究生,主要研究方向为雷达波形设计和成像技术。E-mail:1278619875@qq.com|曹菲(1970-),女,教授,博士研究生导师，博士,主要研究方向为电子信息工程、引爆控制。E-mail:caofeimm@163.com|张鹍鹏(1976-),男,研究员,本科,主要研究方向为弹载雷达。E-mail:13581813150@163.com|占必超(1986-),男,高级工程师,硕士,主要研究方向为雷达总体设计、景象匹配定位算法设计。E-mail:zhbch1986@126.com|李君宜(1995-),女,助理工程师,硕士,主要研究方向为雷达总体设计、雷达成像。E-mail:2272034121@qq.com|占建伟(1983-),男,讲师,博士,主要研究方向为引爆控制、卫星导航。E-mail:conceive_mail@163.com
基金资助:
国家自然科学基金面上项目(61773389);陕西省自然科学基金(2020JQ-298)

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

Yuting BAO^1,²(), Fei CAO¹(), Kunpeng ZHANG²(), Bichao ZHAN²(), Junyi LI²(), Jianwei ZHAN¹()

1. Nuclear Engineering College, Rocket Force University of Engineering, Xi'an 710025, China
2. Beijing Institute of Remote Sensing Equipment, Beijing 100854, China

Received:2020-06-11 Online:2021-02-01 Published:2021-03-16

摘要/Abstract

摘要：

高弹道弹载合成孔径雷达(synthetic aperture radar, SAR)在对中大型舰船目标进行广域成像时,其高弹道高度和高机动速度特性使图像易产生多重距离模糊,图像质量严重恶化。针对这一问题,提出了一种基于正交频分复用线性调频(orthogonal frequency division multiplexing-linear frequency modulation, OFDM-LFM)信号的正交波形设计方案,该方案采用Bernulli映射的混沌调制序列,对OFDM-LFM信号基进行频率调制,降低了信号的互相关峰值电平和自相关峰值旁瓣电平,进一步提高了发射脉冲间的正交性,且该调制方式可产生多个相互正交的波形,以解决多重距离模糊问题。目标成像仿真结果证明,混沌序列调制的OFDM-LFM信号可有效抑制弹载广域SAR成像的距离模糊。

关键词: 广域合成孔径雷达成像, 距离模糊, 正交频分复用线性调频信号, 混沌序列调制

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

中图分类号:

TN958.3

鲍雨婷, 曹菲, 张鹍鹏, 占必超, 李君宜, 占建伟. 基于OFDM-LFM的弹载广域SAR成像距离模糊抑制[J]. 系统工程与电子技术, 2021, 43(2): 369-375.

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.

图/表 16

图1

图2

图3

图4

图5

表1

表2

图6

图7

表3

图8

图9

表4

图10

图11

图12

参考文献 17

1	CURLANDER J C , MCDONOUGH R N . Synthetic aperture radar:systems and signal processing[M]. New York: Wiley, 1991.
2	GEBERT N , KRIEGER G , MOREIRA A . Digital beamforming on receive:techniques and optimization strategies for high-resolution wide-swath SAR imaging[J]. IEEE Trans.on Aerospace and Electronic Systems, 2009, 45 (2): 564- 592. doi: 10.1109/TAES.2009.5089542
3	谢华英, 卢再奇. 弹载平台聚束SAR成像脉冲重复频率设计[J]. 系统工程与电子技术, 2010, 32 (11): 2294- 2298.
	XIE H Y , LU Z Q . Design of pulse repetition frequency for missile-borne spotlight SAR imaging[J]. Systems Engineering and Electronics, 2010, 32 (11): 2294- 2298.
4	MITTERMAYER J, MARTÍNEZ J M.Analysis of range ambiguity suppression in SAR by up and down chirp modulation for point and distributed targets[C]//Proc.of the IEEE International Geoscience and Remote Sensing Symposium, 2003: 4077-4079.
5	DALL J, KUSK A.Azimuth phase coding for range ambiguity suppression in SAR[C]//Proc.of the IEEE International Geoscience and Remote Sensing Symposium, 2004: 1734-1737.
6	AKHTAR J.Cancellation of range ambiguities with block coding techniques[C]//Proc.of the IEEE National Radar Conference, 2009.
7	RICHÉ V, MÉRIC S, POTTIER É, et al.OFDM signal design for range ambiguity suppression in SAR configuration[C]//Proc.of the IEEE International Geoscience and Remote Sensing Symposium, 2012: 2156-2159.
8	RICHÉ V, MÉRIC S, BAUAIS J, et al.Optimization of OFDM SAR signals for range ambiguity suppression[C]//Proc.of the 9th European Radar Conference, 2012: 278-281.
9	RICHÉ V , MÉRIC S , BAUDAIS J , et al. Investigations on OFDM signal for range ambiguity suppression in SAR configuration[J]. IEEE Trans.on Geoscience and Remote Sensing, 2014, 52 (7): 101- 105.
10	WANG W Q . Mitigating range ambiguities in high-PRF SAR with OFDM waveform diversity[J]. IEEE Geoscience and Remote Sensing Letters, 2013, 10 (1): 101- 105. doi: 10.1109/LGRS.2012.2193870
11	WANG W Q . MIMO SAR OFDM chirp waveform diversity design with random matrix modulation[J]. IEEE Trans.on Geoscience and Remote Sensing, 2015, 53 (3): 1615- 1625. doi: 10.1109/TGRS.2014.2346478
12	FLORES B C , SOLIS E A , THOMAS G . Assessment of chaos-based FM signals for range-Doppler imaging[J]. IEE Proceedings-Radar Sonar and Navigation, 2003, 150 (4): 100- 111.
13	DENG Y , HU Y , GENG X . Hyper chaotic logistic phase coded signal and its sidelobe suppression[J]. IEEE Trans.on Aerospace and Electronic Systems, 2010, 46 (2): 672- 686. doi: 10.1109/TAES.2010.5461648
14	ASHTARI A, THOMAS G, GARCES H, et al.Radar signal design using chaotic signals[C]//Proc.of the IEEE Waveform Diversity & Design, 2007: 353-357.
15	BIN C, JUN T, YONG Z, et al.Chaotic signals with weak-structure used for high resolution radar imaging[C]//Proc.of the International Conference on Communications and Mobile Computing, 2009: 325-330.
16	FORTUNA L , FRASCA M , RIZZO A . Chaotic pulse position modulation to improve the efficiency of sonar sensors[J]. IEEE Trans.on Instrumentation and Measurement, 2003, 52 (6): 1809- 1814. doi: 10.1109/TIM.2003.820452
17	谢春健, 李建周, 郭陈江, 等. 基于Logistic混沌映射移频的SAR转发干扰方法[J]. 系统工程与电子技术, 2011, 33 (10): 2210- 2216. doi: 10.3969/j.issn.1001-506X.2011.10.13
	XIE C J , LI J Z , GUO C J , et al. Repeater jamming method for SAR based on Logistic-map shift frequency[J]. Systems Engineering and Electronics, 2011, 33 (10): 2210- 2216. doi: 10.3969/j.issn.1001-506X.2011.10.13

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
-	-

[1]	廖金玲, 廖桂生, 许京伟, 兰岚. 基于EPC-MIMO编码设计的解距离模糊性能分析[J]. 系统工程与电子技术, 2022, 44(7): 2166-2174.
[2]	王宇卓, 朱圣棋, 李西敏, 兰岚. FDA MIMO双基雷达主瓣走动矫正距离模糊杂波抑制[J]. 系统工程与电子技术, 2022, 44(5): 1483-1494.
[3]	曹成虎, 赵永波, 庞晓娇, 徐保庆, 陈胜. 基于中国余数定理的目标距离估计算法[J]. 系统工程与电子技术, 2019, 41(12): 2717-2722.
[4]	徐义正, 廖桂生, 许京伟, 王成浩. 前视阵FDA-MIMO雷达距离模糊杂波抑制方法[J]. 系统工程与电子技术, 2018, 40(12): 2662-2667.
[5]	文珺，史林，廖桂生. 一种机载非正侧视阵雷达近程杂波对消方法[J]. 系统工程与电子技术, 2013, 35(10): 2069-2073.
[6]	王娜, 谭顺成, 王国宏, 刘兆磊. 基于IMM的高脉冲重复频率雷达解距离模糊方法[J]. Journal of Systems Engineering and Electronics, 2011, 33(9): 1970-1977.
[7]	李军侠. 基于三步搜索算法的解距离模糊方法[J]. Journal of Systems Engineering and Electronics, 2011, 33(3): 557-561.

基于OFDM-LFM的弹载广域SAR成像距离模糊抑制

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

RichHTML

PDF (PC)

可视化

摘要/Abstract

引用本文

使用本文

图/表 16

参考文献 17

相关文章 7

编辑推荐

Metrics

本文评价