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激光相干探测比直接探测具有更高的灵敏度,在远距离非合作目标探测识别中具有优势。为实现漫反射目标速度非接触式测量,采取连续激光外差探测方式,对室内转动漫反射目标速度进行测量。通过对影响测量结果的误差源进行分析,找出影响外差测速准确性的主要影响因素并进行修正。同时采用振幅调制法对转速实时测量,将其作为目标真实速度。将外差测速与振幅调制测速结果进行对比,实验表明:顺时针旋转测速相对误差在2%以内的概率为99.25%,测速绝对误差在0.05 m/s以内,随着速度增大,测量相对误差呈减小趋势,测量绝对误差呈增大趋势。受运动目标速度限制,实验测速动态范围在0.05~16 m/s之间,而该测量系统实际测速最大值可达445 m/s。
Laser coherent detection has higher sensitivity than direct detection, and has advantages in long-range non-cooperative target detection and recognition. In order to realize the non-contact measurement of target velocity of diffuse reflection, a continuous laser heterodyne detection method was adopted to measure the target velocity of diffuse reflection in the room. By analyzing the error sources that affect the measurement results, the main influencing factors that affect the accuracy of the velocity measurement of the heterodyne are found and corrected. At the same time using amplitude modulation method of real-time measurement of speed, as the target real speed. The experimental results show that the relative error of clockwise rotation is less than 2% and the absolute error is less than 0.05 m / s. As the velocity increases, the relative error is measured Showing a decreasing trend, the absolute error of measurement showed an increasing trend. Due to the limitation of the moving target speed, the dynamic range of experiment speed is between 0.05-16 m / s, while the maximum speed of this measuring system can reach 445 m / s.