| 基于互相关时延估计的激光引信远距离定距 |
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| 引用本文： | 徐伟,陈钱,顾国华,何伟基.基于互相关时延估计的激光引信远距离定距[J].探测与控制学报,2011,33(3):6-9,23. |
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| 作者姓名： | 徐伟 陈钱 顾国华 何伟基 |
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| 作者单位： | 南京理工大学近程高速目标探测技术国防重点学科实验室,江苏南京,210094 |
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| 基金项目： | 教育部长江学者创新团队项目资助(IRT0733) |
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| 摘 要： | 激光引信远距离定距目标回波微弱、信噪比低,针对传统脉冲式激光测距方式探测困难且测量误差大的难题,提出了基于互相关时延估计的数字化激光引信远距离定距方法。该方法首先通过快速傅里叶变换将发射脉冲和回波脉冲由时域变换到频域,然后对发射脉冲串序列的傅里叶系数进行共轭运算,并与回波脉冲串序列的傅里叶系数相乘,最后通过快速傅里叶逆变换得到互相关函数,对互相关函数进行峰值检测得到回波时延,从而实现目标定距。实验结果表明:该方法可以在低信噪比下实现目标定距,有效增加了激光引信的定距距离,最大测量误差为0.35 m,误差主要来源于回波脉冲的展宽。
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| 关 键 词： | 激光引信 远距离定距 互相关 时延估计 |
Laser Fuze Long-distance Ranging Based on Cross-correlation Time Delay Estimation |
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| XU Wei,CHEN Qian,GU Guohua,HE Weiji.Laser Fuze Long-distance Ranging Based on Cross-correlation Time Delay Estimation[J].Journal of Detection & Control,2011,33(3):6-9,23. |
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| Authors: | XU Wei CHEN Qian GU Guohua HE Weiji |
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| Affiliation: | XU Wei,CHEN Qian,GU Guohua,HE Weiji(Ministerial Key Laboratory of JGMT,Nanjing University of Science and Technology,Nanjing 210094,China) |
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| Abstract: | In order to solve the problems that conventional pulsed laser fuze long-distance ranging system had difficulties to detect the targets over long distance and the detecting precision was very poor due to the extremely weak echo signal and low SNR,a digital pulsed laser fuze long-distance ranging method was proposed based on the principle of cross-correlation time delay estimation.Firstly,the transmitted pulse and echo pulse were transformed into the frequency domain from the time domain by fast Fourier trans... |
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| Keywords: | laser fuse long-distance detection cross-correlation time delay estimation |
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