基于不同导航信号的BISAR系统分辨性能分析
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摘要
基于GNSS信号的双基合成孔径雷达(BISAR)成像系统具有多种突出的优势,已获得越来越多的关注。文中在广义模糊函数的基础上,针对导航卫星信号的伪随机码的特点,引入平均模糊函数的概念,以消除码元序列的伪随机性对系统模糊函数的影响。构建了适用于分析不同码元序列的平均广义模糊函数,对基于不同导航信号的BISAR系统的分辨性能进行了分析比较,并通过仿真进行验证。研究结果表明,导航卫星轨道对BISAR系统的分辨性能有较大影响,BDS导航信号拥有良好的分辨能力。
The BISAR system based on navigation satellite signals attracted more and more attention for its advantages. The concept of average ambiguity function was introduced in this paper in order to analyze the resolution capability of BISAR system independently of the particular pseudo-random code,and the generalized ambiguity function( GAF) of the system was studied. Then average GAFs of BISAR system based on different GNSS signals were calculated to compare their resolution performance. The results indicated that the trajectory of navigation satellite had a great influence on the performance of the BISAR system and BDS signal had the best resolution capability.
The BISAR system based on navigation satellite signals attracted more and more attention for its advantages. The concept of average ambiguity function was introduced in this paper in order to analyze the resolution capability of BISAR system independently of the particular pseudo-random code,and the generalized ambiguity function( GAF) of the system was studied. Then average GAFs of BISAR system based on different GNSS signals were calculated to compare their resolution performance. The results indicated that the trajectory of navigation satellite had a great influence on the performance of the BISAR system and BDS signal had the best resolution capability.
引文
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[15]甄杰,张振华,吴顺君.基于GPS信号的双基SAR数值距离徙动成像算法[J].电子与信息学报,2009,31(9):2039-2043.Zhen Jie,Zhang Zhenhua,Wu Shunjun,GPS signal based numeric range migration algorithm of bistatic SAR[J]. Journal of Electronics&Information Technology,2009,31(9):2039-2043.
[2] Wang J,Zhang X,Bao Z. Passive radar imaging algorithm based on subapertures synthesis of multiple television stations[J]. Journal of Electronics&Information Technology,2007,29(3):1-4.
[3] Gromek D,Kulpa K,Samczyński P. Experimental results of passive SAR imaging using DVB-T illuminators of opportunity[J]. IEEE Geoscience&Remote Sensing Letters,2016,13(8):1124-1128.
[4] Wei Qiu,Elisa Giusti,Alessio Bacci,et al. Compressive sensing-based algorithm for passive bistatic ISAR with DVB-T signals[J]. IEEE Transactions on Aerospace and Electronic Systems,2015,51(3):2166-2180.
[5]田卫明,曾涛,胡程.基于导航信号的Bi SAR成像技术[J].雷达学报,2013,2(1):39-45.Tian Weiming,Zeng Tao,Hu Cheng. Imaging algorithm for bistatic SAR based on GNSS signal[J]. Journal of Radars,2013,2(1):39-45.
[6]范学祯,刘飞峰,张天,等.基于北斗导航卫星的Bi SAR大场景成像[J].信号处理,2017,33(4):546-550.Fan Xuezhen,Liu Feifeng,Zhang Tian,et al. Large scene imaging of Bi SAR using Bei Dou navigation satellite system[J].Journal of Signal Processing,2017,33(4):546-550.
[7] Zavorotny V U,Voronovich A G. Scattering of GPS signals from the ocean with wind remote sensing application[J].IEEE Transactions on Geoscience&Remote Sensing,2000,38(2):951-964.
[8] Cherniakov M. Space-surface bistatic synthetic aperture radar-prospective and problems[C]. Edinburgh:International Conference of Radar,2002.
[9] Cherniakov M,Saini R,Zuo R,et al. Space-surface bistatic synthetic aperture radar with global navigation satellite system transmitter of opportunity-experimental results[J]. IET Radar Sonar&Navigation,2007,1(6):447-458.
[10] Zeng Tao,Liu Feifeng,Hu Cheng,et al. Image formation algorithm for asymmetric bistatic SAR systems with a fixed receiver[J]. IEEE Transactions on Geoscience&Remote Sensing,2012,50(11):4684-4698.
[11] Zeng Tao,Zhang Tian,Tian Weiming,et al. Bistatic SAR imaging processing and experiment results using Bei Dou-2/Compass-2 as illuminator of opportunity and a fixed receiver[C]. Singapore:5thIEEE Asia-Pacific Conference on Synthetic Aperture Radar,APSAR,2015.
[12] Zeng Tao,Cherniakov M,Long Teng. Generalized approach to resolution analysis in BSAR[J]. IEEE Transactions on Aerospace&Electronic Systems,2005,41(2):461-474.
[13] Daout F,Schmitt F,Ginolhac G,et al. Multistatic and multiple frequency imaging resolution analysis-application to GPSbased multistatic radar[J]. IEEE Transactions on Aerospace&Electronic Systems,2012,48(4):3042-3057.
[14] Santi F,Antoniou M,Pastina D. Point spread function analysis for GNSS-based multistatic SAR[J]. IEEE Geoscience&Remote Sensing Letters,2015,12(2):304-308.
[15]甄杰,张振华,吴顺君.基于GPS信号的双基SAR数值距离徙动成像算法[J].电子与信息学报,2009,31(9):2039-2043.Zhen Jie,Zhang Zhenhua,Wu Shunjun,GPS signal based numeric range migration algorithm of bistatic SAR[J]. Journal of Electronics&Information Technology,2009,31(9):2039-2043.