提出了一种二维点列式激光多普勒测量方法, 用于捕捉轨迹有一定波动范围的空间运动物体的速度信息。该方法使衍射光栅产生的多束相干光在空间某探测位置相交,从而形成一个结构可调的二维探测体阵列。当物体轨迹的波动量在二维阵列范围内时,系统即可以获得其速度信息。与扩展光束型的多普勒测速系统相比,该方法具有空间分辨率高及能量集中等优点,因此可以用于远距离探测。另外,对固体表面散射光的多普勒信号进行了分析及模拟。结果表明：测量结果与模拟结果相一致,且经频谱校正后的平均误差可以达到1.63%。该系统结构易于集成,调节方便,适用于轨迹有一定波动量的空间物体的速度测量。

A two-dimensional point Laser Doppler Velocimeter (LDV) is proposed for the velocity measurement of solid objects with a certain trajectory fluctuation. The arrangement uses several coherent beams generated by the same ruled diffraction gratings to form a two-dimensional detecting region with several groups of measuring volume array. The structure of the detecting region is adjusted manually in terms of the specific measuring conditions. When object trajectory fluctuation does not exceed the detecting region, the system effectively detects the velocities of objects. As compared to the beam expanded differential LDV, this type of instrument has a higher spatial resolution due to its small measurement volume. In addition, the system concentrates its energy upon the detecting point instead of the whole area, so it is more suitable for remote detection. The signal of scattered lights from the solid object is also analyzed and simulate. Experimental results indicate that the measurement result is in agreement with the simulated one, and the mean error of velocity is 1.63% by using the frequency spectrum correction algorithm. The presented system has a potential for realizing the velocity measurement of spatial objects with a certain trajectory fluctuation.