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调频连续波激光雷达探测运动目标时,通常采用二维傅里叶变换解耦合方法.当探测高速运动目标时,由于目标移动导致不同调频周期的中频信号频谱峰值不在同一距离单元,用二维傅里叶变换法进行解耦将产生速度模糊.新的解耦方法通过对多个周期的中频信号频谱峰值位置进行直线拟合,获得目标径向速度估计值.利用速度估计值构建多普勒补偿信号,并与原中频信号相乘.补偿后的中频信号频谱峰值在同一距离单元内.将补偿后的中频信号用二维傅里叶变换法获得的径向速度与之前的速度估计值相加,得到最终的目标径向速度.仿真结果说明新方法在获得较高测距、测速精度的同时,可以有效提高调频连续波激光雷达的无模糊速度.
Frequency-modulated CW laser lidar usually uses two-dimensional Fourier transform decoupling method.When the high-speed moving target is detected, the peaks of the intermediate frequency signal spectrum with different frequency modulation periods are not in the same distance unit due to the target moving, The decoupling of the Fourier transform method will produce the speed fuzzy.The new decoupling method obtains the target radial velocity estimation value by linearly fitting the peak positions of the intermediate frequency signal spectrum of multiple periods.The Doppler compensation Signal, and multiplied with the original IF signal. The compensated IF signal spectrum peak within the same distance unit. The compensated IF signal obtained by two-dimensional Fourier transform radial velocity obtained with the previous velocity estimate , And the final target radial velocity is obtained.The simulation results show that the new method can effectively improve the speed of the FM CW LIDAR without gaining higher ranging and velocity accuracy.