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线性调频连续波激光雷达在光电器件响应速度有限的条件下,要满足较高的距离分辨率的测量要求,就需要比同体制微波雷达大得多的相对带宽。这就导致线性调频连续波微波雷达的距离与速度去耦合方法不能被直接应用。针对探测近距高速运动目标和实时性高的要求,根据激光雷达目标回波的特点,提出了一种快速线性调频信号参数估计方法,利用均匀分成两段的中频信号的傅里叶变换来获取目标的距离与速度信息。在目标距离50m,速度1000m/s,中频信噪比为0的仿真条件下,雷达测距误差小于15mm,测速误差小于10m/s。仿真实验表明,该方法具有较高的测量精度和较强的抗干扰能力。
LFM CW laser lidar in the photoelectric device response speed is limited, to meet the higher resolution of the distance measurement requirements, you need to be much larger than the same system microwave radar relative bandwidth. This leads to that the method of decoupling the distance and speed of LFM microwave radar can not be applied directly. According to the characteristics of laser radar target echo, a fast linear frequency modulation signal parameter estimation method is proposed, which is based on the Fourier transform of the IF signal evenly divided into two segments. Target distance and speed information. Under the simulation condition that the target distance is 50m, the speed is 1000m / s and the intermediate frequency-to-noise ratio is 0, the ranging error of radar is less than 15mm and the error of measurement speed is less than 10m / s. Simulation results show that this method has higher accuracy and stronger anti-interference ability.