航空学报 > 2014, Vol. 35 Issue (2): 523-531   doi: 10.7527/S1000-6893.2013.0409

调频连续波激光雷达目标相对距离及径向速度信息提取方法

杜小平1, 宋一铄2, 曾朝阳3   

  1. 1. 装备学院 航天指挥系, 北京 101416;
    2. 装备学院 研究生院, 北京 101416;
    3. 装备学院 光电装备系, 北京 101416
  • 收稿日期:2013-05-20 修回日期:2013-10-08 出版日期:2014-02-25 发布日期:2013-10-24
  • 通讯作者: 杜小平,Tel.:010-66364643 E-mail:dxp8600@163.com E-mail:dxp8600@163.com
  • 作者简介:杜小平 女,博士,教授,博士生导师。主要研究方向:空间光学测量。Tel:010-66364643 E-mail:dxp8600@163.com;宋一铄 男,博士研究生。主要研究方向:光电探测器建模与应用。E-mail:stephensong1005@sina.com.cn;曾朝阳 男,博士,副教授。主要研究方向:光电探测系统设计。E-mail:cyzeng@139.com
  • 基金资助:

    部级项目

Methods for Relative Distance and Radial Velocity Information Extraction in LFM/CW Laser Radar

DU Xiaoping1, SONG Yishuo2, ZENG Zhaoyang3   

  1. 1. Department of Aerospace Command, Academy of Equipment, Beijing 101416, China;
    2. Graduate School, Academy of Equipment, Beijing 101416, China;
    3. Department of Photoelectric Equipment, Academy of Equipment, Beijing 101416, China
  • Received:2013-05-20 Revised:2013-10-08 Online:2014-02-25 Published:2013-10-24
  • Supported by:

    Ministry Level Project

摘要:

利用线性调频连续波(LFM/CW)激光雷达进行测量时,相对运动引起的多普勒效应和信息输出延迟都会造成测量结果偏差。分析了多普勒效应和信息输出延迟对测量的影响,提出了基于偏差抵消原理的相对距离及径向速度信息提取方法,根据测量任务需求对该方法和基于二维傅里叶变换的信息提取方法进行了仿真比较。结果表明:基于偏差抵消的信息提取方法不仅可以在相对径向速度未知的情况下准确提取目标相对距离信息,更可在每个调频周期结束后给出测距结果从而提高测距实时性;相比基于二维傅里叶变换的信息提取方法,当相对径向速度小于750 m/s时,基于偏差抵消的信息提取方法可使得测速偏差减小一个数量级。

关键词: 调频连续波, 激光雷达, 多普勒效应, 偏差抵消, 相对测量

Abstract:

When using the LFM/CW laser radars, the relative motion between a target and the radar causes the Doppler effect and information output delay which may result in measurement errors. In this paper, the so-caused measurement errors are analyzed. Based on the idea of error cancellation, a new method for information extraction is presented. Simulations are performed to compare this new method with the method based on 2-dimentional FFT (2D-FFT). The results show that the new method can extract accurate relative distance information in every modulation period while the relative radial velocity information is unknown. Compared with the 2D-FFT based method, the new method decreases the errors in velocity measurement by one order of magnitude when the relative radial velocity is less than 750 m/s.

Key words: LFM/CW, laser radar, Doppler effect, error cancellation, relative measurement

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