跟踪移动信标并实时计算斜程路径大气相干长度的差分像运动测量装置

DIMM System for Tracking Motion Target and Calculating the Atmospheric Coherence Length along Slant Propagation Path

介绍了一种能够跟踪移动信标的新型大气相干长度测量系统。系统使用遗传算法与区域加宽迭代质心算法结合而成的新算法处理差分运动图像,实时计算移动目标脱靶量与光波到达角起伏方差,实现了跟踪测量的功能。测量实验中,利用飞行高度为35km的平流层气球搭载的碘钨灯作为光源,实时测量了斜程传输路径上的大气相干长度值。与此同时,在距离新仪器5m处放置了一台以太阳的边缘作为光源、测量整层大气相干长度的大气相干长度仪进行对比测量。对比结果表明,两组测量数据具有较好的相关性。据此初步分析与讨论了利用激光导星技术主动探测整层大气相干长度的可行性。

A new differential image motion monitor （DIMM） system for measuring atmospheric coherence length which can track motion target is developed. The system uses a new algorithm which is composed of genetic algorithm and iterative centroid algorithm to process differential image and calculate the offset of the target and the covariance of the angle-of-arrival fluctuation in realtime. So, it can track motion targets and measure the atmospheric coherence length. In experiment, we use a halogen lamp tied in a stratosphere balloon at the altitude of 35 km as the lamp-house to measure the atmospheric coherence length along slant propagation path. Simultaneously, we put another instrument 5 m away from the new system which selects the solar limb as the lamp-house to measure the total layer atmospheric coherence length. The result indicates a linear correlation between the two groups of data. At last, we analyze and discuss the feasibility of a method which can use laser guide star to measure the total layer atmospheric coherence length.