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

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。

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

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.