基于伪随机码相位调制和外差探测的高精度激光测速测距系统研究

为在远距离范围内实现高精度的激光测速测距，提出了一种联合利用伪随机码相位调制和外差探测技术的激光测速测距方法，并搭建了实验验证平台。当激光出射功率为2mW、参考光功率为117 、调制速率为100MHz、单周期内伪随机码序列长度为81.9 时，该系统在对位于约8 m处、径向速度约为1.4 m/s的目标进行测试时，可以实现0.138m的测距精度，以及4.16cm/s 的测速精度。实验结果证实，该套系统可实现高精度的径向速度和距离测量，且系统工作状态为长脉宽低峰值功率，为远距离的激光测速测距系统设计开辟了一条新途径。

Research on high precision lidar velocity and range measurement system based on the technologies of pseudo-random code phase

In order to realize a high precision measurement for velocity and range in a long distance, a method based on the technologies of Pseudorandom Code (PRC) phase modulation and heterodyne detection is proposed, and an experiment demonstration system is established. With the laser emission power of about 2mW, the local oscillator power of about 117 , the modulation rate of 100MHz, and the single-period Pseudo-random Code sequence length of about 81.9 , the system can realize a range accuracy of 0.138m and a speed accuracy of 4.16cm/s when the target located is at about 8m with a line of sight velocity of about 1.4m/s. The experimental results show that the system can realize a high precision velocity and range measurement with a low peak power and a long pulse length, which offers a new way for the design of long distance laser speed and range measurement system.