频率捷变对改善低空目标探测的分析与研究
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摘要
由于预警雷达在低空探测中受多径影响严重,导致雷达跟踪性能下降。而频率捷变作为雷达常规抗干扰措施,其捷变特性在一定程度上能使多路径信号和回波信号去相关、减小其影响。为此,首先建立了多径模型,计算了雷达多路径传输因子。在此基础上,分析了频率捷变的去相关特性,得出了不同多路径路程差去相关所需要的捷变带宽。紧接着,建立雷达回波仿真模型,对不同捷变间隔情况下的单脉冲回波和积累后的信噪比进行比较。可以看出,捷变带宽越宽,对多径改善越好,但对于目标回波受多径影响不大的位置,捷变没有改善效果,相反信噪比会有少量损失。
Due to multipath impact on early warning radar detection performance of low altitude target,the track performance drops. Frequency agility acting as the regular anti-interference measure can decorrelate the multipath signal and radar echo signal partly. Therefore,firstly,a multipath model is built and the multipath transmission coefficient is computed. Based on this,the decorrelation of frequency agility is analyzed and the agility bandwidth of different multipath differences is obtained. Then,the signal noise ratio( SNR) of single pulse and accumulation with different agility intervals are compared.Lastly,it comes to the conclusion that the more agility bandwidth will get the better performance.However,the frequency agility will not improve SNR at the normal location where SNR will have little loss.
Due to multipath impact on early warning radar detection performance of low altitude target,the track performance drops. Frequency agility acting as the regular anti-interference measure can decorrelate the multipath signal and radar echo signal partly. Therefore,firstly,a multipath model is built and the multipath transmission coefficient is computed. Based on this,the decorrelation of frequency agility is analyzed and the agility bandwidth of different multipath differences is obtained. Then,the signal noise ratio( SNR) of single pulse and accumulation with different agility intervals are compared.Lastly,it comes to the conclusion that the more agility bandwidth will get the better performance.However,the frequency agility will not improve SNR at the normal location where SNR will have little loss.
引文
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[13]WILSON S L,CARLSON B D.Radar Detection in Multipath[J].IEE Pro-Radar,Sonar Navig,1999,1(1):45-54.
[14]何子述,黎敏,荆玉兰.频率捷变的相控阵雷达目标多径DOA估计算法[J].系统工程与电子技术,2005,27(11):1880-1883.HE Zi-shu,LI Min,JING Yu-lan.Target Multipath DOA Estimation Algorithm Based Ofrequency Agility for Phased Array Radar[J].Systems Engineering and Electronics,2005,27(11):1880-1883.
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[2]斯科尼克.雷达系统导论[M].北京:电子工业出版社,2006:365-367.Merrilli Skolnik.Introduction to Radar Systems[M].Beijing:Publishing House of Electronics Industry,2006:365-367.
[3]周志增,侯少岭,于志勇.干扰和多径对低空目标检测概率的复合影响分析[J].科学技术与工程,2016,16(3):7-10.ZHOU Zhi-zeng,HOU Shao-ling,YU Zhi-yong.Analysis of Low Altitude Target Detection Probability Affecting with Jamming and Multipath[J].Science Technology and Engineering,2016,16(3):7-10.
[4]刘晓宏,文树梁.频率分集技术在雷达低角跟踪中的应用[C]∥第十届全国雷达学术年会论文集,2008:253-255.LIU Xiao-hong,WEN Shu-liang.The Application of Frequency Diversity in Low-Angle Radar Tracking[J].The10th National Annual Conference on Radar,2000,25:253-255.
[5]王国玉,汪连栋.雷达电子战系统数学仿真与评估[M].北京:国防工业出版社,2004:306-309.WANG Guo-yu,WANG Lian-dong.Mathematical Simulation and Evaluation of Radar Electronic Warfare System[M].Beijing:National Defence Industry Press,2004:306-309.
[6]朱雅楠,倪晓峰.单脉冲雷达低空多路径建模与仿真分析[J].现代防御技术,2011,39(4):179-183.ZHU Ya-nan,NI Xiao-feng.Modeling and Simulation Analysis of Monopulse Radar Low Altitude Multipath[J].Modern Defence Technology,2011,39(4):179-183.
[7]王利军,郭建明,郝晶.多径效应对雷达探测低空巡航导弹的影响[J].雷达科学与技术,2011,8(1):7-10.WANG Li-jun,GUO Jian-ming,HAO Jing.The Influence of Multi-Path Effect on Low Altitude Cruise Missile Detection in Radar[J].Radar Science and Technology,2011,8(1):7-10.
[8]BARTON D K.Low-Angle Radar Tracking[J].Proc of the IEEE,1974,62(6):687-704.
[9]刘以安,邓亮,钟娟,等.雷达电磁信号的多径传播仿真研究[J].计算机仿真,2005,22(6):15-19.LIU Yi-an,DENG Liang,ZHONG Juan,et al.Study of Multi-Path Propagation Simulation of Radar Signal[J].Computer Simulation,2005,22(6):15-19.
[10]SCOLNIK M I.Radar Handbook[M].2nd ed.New York:Mc Graw-Hill Publishing Company,1999.
[11]徐振海,肖顺平,熊子源.阵列雷达低角跟踪技术[M].北京:科学出版社,2014:123-125.XU Zhen-hai,XIAO Shun-ping,XIONG Zi-yuan.Low Angle Tracking Techniques for Array Radars[M].Beijing:Science Press,2014:123-125.
[12]徐振海,黄坦,熊子源,等.基于频率分集的阵列雷达低角跟踪算法[J].国防科学技术大学学报,2014,36(2):93-98.XU Zhen-hai,HUANG Tan,XIONG Zi-yuan,et al.Low Angle Tracking Algorithm Using Frequency Diversity for Array Radar[J].Journal of National University of Deffence Thechnology,2014,36(2):93-98.
[13]WILSON S L,CARLSON B D.Radar Detection in Multipath[J].IEE Pro-Radar,Sonar Navig,1999,1(1):45-54.
[14]何子述,黎敏,荆玉兰.频率捷变的相控阵雷达目标多径DOA估计算法[J].系统工程与电子技术,2005,27(11):1880-1883.HE Zi-shu,LI Min,JING Yu-lan.Target Multipath DOA Estimation Algorithm Based Ofrequency Agility for Phased Array Radar[J].Systems Engineering and Electronics,2005,27(11):1880-1883.
[15]Mark A Richards.雷达信号处理基础[M].北京:电子工业出版社,2008:242-244.Mark A Richards.Fundamentals of Radar Signal Processing[M].Beijing:Publishing House of Electronics Industry,2008:242-244.