非合作转动目标相干测速实验研究

Experimental research of heterodyne velocity measurement for non-cooperative rotatable target

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。

Heterodyne laser detection has much more higher sensitivity than direct detection,and it has great advantage in the detection and recognition of long range non-cooperative target.In order to realize the non-touch velocity measurement of diffuse reflection object,the continuous wave laser heterodyne detection was adopted in this paper for the sake of velocity measurement of rotatable target in the laboratory.The main factors that influence the velocity accuracy was found and modified via the analysis of error source.At the same time,the method of amplitude modulation was used for the velocity calibration,of which the result was considered as the real velocity of the rotatable object.Then,the velocity results from the two methods above were compared and the results show that the probability that relative errors are lower than 2% is 99.25%,while the target rotated clockwise;the absolute errors are less than 0.05 m/s;the relative errors has increscent trend and the absolute errors has shrunken trend while increasing the rotatable velocity;the dynamic range of the measured velocity is from 0.05 m/s to 16 m/s due to the restriction of the target′s velocity.The maximal velocity which can be measured in the experimental system is 445 m/s.