距离模糊对SABBR杂波功率谱的影响
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摘要
天空双基地预警雷达常采用高脉冲重复频率,由此带来的距离模糊对杂波功率谱会产生一定的影响。针对该问题,首先分析了天空双基地预警雷达的几何关系,然后建立了杂波模型并给出了距离模糊下的杂波协方差矩阵,最后通过仿真分析了不同收发球心角下模糊距离环的分布情况,以及不同收发球心角和飞行方向构型下距离模糊对杂波功率谱的影响。仿真结果表明距离模糊的分布情况主要由收发球心角决定,距离模糊使天空双基地预警雷达杂波频谱严重展宽,自由度增加。研究成果可为距离模糊下的杂波抑制技术提供技术支撑。
High pulse repetition frequency is often used in space-air based bistatic radar,which brings range ambiguity causing certain impact on clutter power spectrum. In view of this issue,firstly,the geometric relations of space-air based bistatic radar are analyzed,based on which a clutter model is established. Next the clutter covariance matrix considering range ambiguity is given. Finally,the distribution of range ambiguity under different sphere central angles and the impact of range ambiguity on clutter power spectrum under different sphere central angles and flight direction configurations are analyzed through simulation. The results show that distribution of range ambiguity is mainly determined by sphere central angle,and the range ambiguity causes the stretching of clutter spectrum and increasing of degree of freedom. The research results can provide technical support for clutter suppression technology under range ambiguity.
High pulse repetition frequency is often used in space-air based bistatic radar,which brings range ambiguity causing certain impact on clutter power spectrum. In view of this issue,firstly,the geometric relations of space-air based bistatic radar are analyzed,based on which a clutter model is established. Next the clutter covariance matrix considering range ambiguity is given. Finally,the distribution of range ambiguity under different sphere central angles and the impact of range ambiguity on clutter power spectrum under different sphere central angles and flight direction configurations are analyzed through simulation. The results show that distribution of range ambiguity is mainly determined by sphere central angle,and the range ambiguity causes the stretching of clutter spectrum and increasing of degree of freedom. The research results can provide technical support for clutter suppression technology under range ambiguity.
引文
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[15] HUANG Z,WANG L,YUAN J,et al. Doppler Frequency Analysis of Ground Clutter for Space-Air Based Bistatic Radar[C]∥Radar Conference 2015,IET International.IET,2015.-4.
[2]周志鹏.天基雷达的发展与系统技术[J].现代雷达,2011,33(12):1-5.ZHOU Zhi-peng. Development and System Technique of SBR[J]. Modern Radar,2011,33(12):1-5.
[3]李青,林幼权,武楠.美国天基预警雷达发展历程及现状分析[J].现代雷达,2018(1):7-10.LI Qing,LIN You-quan,WU Nan. Analysis of Development History and Status for American Space-Base Early Warning Radar[J]. Modern Radar,2018(1):7-10.
[4]汤春林.天基AMTI雷达信号处理若干关键技术研究[D].成都:电子科技大学,2012:12-38.TANG Chun-lin. Research on Key Techniques of Signal Processing in Space-Based Radar[D]. Chengdu:University of Electronic Science and Technology of China,2012:12-38.
[5]王文生,王小谟.天基雷达的几个基本问题[J].现代雷达,2007,29(4):1-4.WANG Wen-sheng,WANG Xiao-mo. Several Basic Questions for Space-Based Radar[J]. Modern Radar,2007,29(4):1-4.
[6] DAVIS M E. Technology Challenges in Affordable Space Based Radar[C]∥Radar Conference,2000. The Record of the IEEE 2000 International. IEEE,2000:18-23.
[7] S. Unnikrishna Pillai,KE Yong-li,Braham Himed,等.天基雷达理论与应用[M].北京:电子工业出版社,2016.
[8] KE Yong-li,MANGIAT S,ZULCH P,et al. Clutter Impacts on Space Based Radar Gmti:a Global Perspective[C]∥2007-06-15,S. l.:s. n.,2007:1-15.
[9] PILLAI S. Effect of Earth’s Rotation and Range Fold over on Space Based Radar Performance[C]∥IEEE International Radar Conference,Arlington,Virginia,USA.USA:IEEE,2005:348-353.
[10]王悦,袁俊泉,黄忠言,等.地球自转对SABBR杂波多普勒特性的影响[J].空军预警学院学报,2018,32(1):16-20.WANG Yue,YUAN Jun-quan,HUANG Zhong-yan,et al. Effect of Earth’s Rotation on Clutter Doppler Characteristics in Space-Air Based Bistatic Radar[J]. Air Force Early Warning Academy,2018,32(1):16-20.
[11] PENG Y U,JIANG C S. Space-Time Two-Dimensional Clutter Modeling and Peformance Analysis of STAP for Space-Based Radar[J]. Modern Radar,2011,33(3):29-33.
[12]王瑜,贾鑫.天基双基地预警雷达地杂波频率特性研究[J].系统仿真学报,2008,20(24):6866-6870.WANG Yu,JIA Xin. Research of Frequency Characteristics of Ground Clutter for Space-Based Bistatic Warning Radar[J]. Journal of System Simulation,2008,20(24):6866-6870.
[13] LI Hua,TANG Jun,PENG Ying-ning. The Clutter Range-Ambiguity in Hybrid Bistatic Space-Based Radar[C]∥IEEE Conference on Radar,2016
[14]袁博资,王力宝,袁俊泉,等.天空双基地雷达杂波建模与分析[J].信号处理,2015,31(5):611-620.YUAN Bo-zi,WANG Li-bao,YUAN Jun-quan,et al.Modeling and Analysis of Clutter for Space-Air Based Bistatic Radar[J]. Journal of Signal Processing,2015,31(5):611-620.
[15] HUANG Z,WANG L,YUAN J,et al. Doppler Frequency Analysis of Ground Clutter for Space-Air Based Bistatic Radar[C]∥Radar Conference 2015,IET International.IET,2015.-4.