基于倒谱分析的脉冲激光测距抗云烟干扰算法
|
摘要
针对脉冲激光测距因云烟干扰造成的多径效应而难以准确定位目标回波的问题,介绍了倒谱提取时延的原理,以及利用倒谱技术结合信号积累来定位真实目标回波位置的方法,随后分析讨论了累积次数、混叠因子和输入信噪比对目标定位率的影响,并用蒙特卡罗法统计得到3个影响因子与目标定位率的关系图。针对输入信噪比对目标定位率有较大影响的分析结果,使用小波阈值去噪作为算法的预处理,仿真结果表明加入去噪流程后定位性能得到了一定提升。
Aiming at the difficulty of locating target echo when multi-path interference was involved in pulse laser range measurement which was usually caused by clouds and smog,an algorithm using cepstrum technology and signal accumulation was proposed.The principle of time-delay detection using cepstrum technology and the detailed process of the location algorithm was introduced.Then the influence of numbers of accumulation,aliasing factor and received SNR on location rates of target echo was discussed,and the relationship diagrams of these three factors were given by using Monte Carlo method.The statistical results show that the received SNR makes great influence on location rates of target echo.Therefore,wavelet threshold denoising method was used as a pretreatment and the location rates was improved to some extent.
Aiming at the difficulty of locating target echo when multi-path interference was involved in pulse laser range measurement which was usually caused by clouds and smog,an algorithm using cepstrum technology and signal accumulation was proposed.The principle of time-delay detection using cepstrum technology and the detailed process of the location algorithm was introduced.Then the influence of numbers of accumulation,aliasing factor and received SNR on location rates of target echo was discussed,and the relationship diagrams of these three factors were given by using Monte Carlo method.The statistical results show that the received SNR makes great influence on location rates of target echo.Therefore,wavelet threshold denoising method was used as a pretreatment and the location rates was improved to some extent.
引文
[1]Zhou Zhiwei,Sun Xiaoquan,Fan Xiang.Jamming methodson laser rangefinder and relational countermeasures[J].Infrared and Laser Engineering,2005,34(12):646-650.(in Chinese)周志伟,孙晓泉,樊祥.激光测距干扰与反干扰技术研究[J].红外与激光工程,2005,34(12):646-650.
[2]Oppenheim Alan V,Schafer Ronald W.Discrete-Time SignalProcessing[M].Beijing:Science Press,1998:632-634.(inChinese)A V奥本海姆,R W谢弗.离散时间信号处理[M].北京:科学出版社,1998:632-634.
[3]Zhou Changxi,Xu Guoming.Homomorphic signal processingof continuous multiple earthquake overlap recording[J].ActaSeismologica Sinica,1990,12(3):299-306.(in Chinese)周常羲,徐果明.连续多发地震重叠记录的同态信号处理[J].地震学报,1990,12(3):299-306.
[4]He Zhengjia,Zi Yanyang,Zhang Xining.Modern SignalProcessing and Engineering Application[M].Xi'an:Xi'anJiaotong University Press,2007:63-64.(in Chinese)何正嘉,訾艳阳,张西宁.现代信号处理及工程应用[M].西安:西安交通大学出版社,2007:63-64.
[5]Wan Jianwei,Wang Ling.Signal Processing SimulationTechnology[M].Changsha:National University of DefenseTechnology Press,2008:250-252.(in Chinese)万建伟,王玲.信号处理仿真技术[M].长沙:国防科技大学出版社,2008:250-252.
[6]Ove Steinvall,Tomas Chevalier.Range accuracy and resolutionfor laser radars[C]//SPIE,2005,5988:598808-1-598808-16.
[7]Zhang Zhengyu,Sui Xiaolin.Faint signal digital correlationdetection of laser ranging:study and simulation[J].ChineseJournal of Lasers,2002,29(7):661-665.(in Chinese)章正宇,眭晓林.激光测距弱信号数字相关检测技术的研究和仿真[J].中国激光,2002,29(7):661-665.
[8]Li Li,Peng Yuhua,Yang Mingqiang,et al.New signal de-noising method and its application in laser signal[J].Infrared and Laser Engineering,2006,35(3):305-309.(inChinese)李立,彭玉华,杨明强,等.一种新的信号去噪方法及在激光信号中的应用[J].红外与激光工程,2006,35(3):305-309.
[2]Oppenheim Alan V,Schafer Ronald W.Discrete-Time SignalProcessing[M].Beijing:Science Press,1998:632-634.(inChinese)A V奥本海姆,R W谢弗.离散时间信号处理[M].北京:科学出版社,1998:632-634.
[3]Zhou Changxi,Xu Guoming.Homomorphic signal processingof continuous multiple earthquake overlap recording[J].ActaSeismologica Sinica,1990,12(3):299-306.(in Chinese)周常羲,徐果明.连续多发地震重叠记录的同态信号处理[J].地震学报,1990,12(3):299-306.
[4]He Zhengjia,Zi Yanyang,Zhang Xining.Modern SignalProcessing and Engineering Application[M].Xi'an:Xi'anJiaotong University Press,2007:63-64.(in Chinese)何正嘉,訾艳阳,张西宁.现代信号处理及工程应用[M].西安:西安交通大学出版社,2007:63-64.
[5]Wan Jianwei,Wang Ling.Signal Processing SimulationTechnology[M].Changsha:National University of DefenseTechnology Press,2008:250-252.(in Chinese)万建伟,王玲.信号处理仿真技术[M].长沙:国防科技大学出版社,2008:250-252.
[6]Ove Steinvall,Tomas Chevalier.Range accuracy and resolutionfor laser radars[C]//SPIE,2005,5988:598808-1-598808-16.
[7]Zhang Zhengyu,Sui Xiaolin.Faint signal digital correlationdetection of laser ranging:study and simulation[J].ChineseJournal of Lasers,2002,29(7):661-665.(in Chinese)章正宇,眭晓林.激光测距弱信号数字相关检测技术的研究和仿真[J].中国激光,2002,29(7):661-665.
[8]Li Li,Peng Yuhua,Yang Mingqiang,et al.New signal de-noising method and its application in laser signal[J].Infrared and Laser Engineering,2006,35(3):305-309.(inChinese)李立,彭玉华,杨明强,等.一种新的信号去噪方法及在激光信号中的应用[J].红外与激光工程,2006,35(3):305-309.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心