Study an Observation Method of Space Debris Environments by a Laser Radar

激光雷达的探测能力在很大程度上取决于激光的输出和光学天线的性能。激光的辐射方向图应尽量均匀，无黑斑。实验表明，将常规w级高功率激光器应用于无线应用时，由于图案的劣化，激光雷达的特性明显下降。推导出了一种能使宽波段激光器的辐射方向图平滑的设计方法。在高性能光学天线馈电系统中，设计了一种最能容忍制造误差的反射面整形方法——副反射面和透镜。通过仿真验证了该方法的有效性。强照明和接收光是通过空间叠加从多个激光器的输出功率得到的。在单模激光中，对散斑效应进行限制是可能的。这一事实已被实验证实。

The detection capability of laser radars strongly depends on the output of a laser and the performance of an optical antenna. The radiation pattern of the laser should be uniform without dark spots as much as possible. It was experimentally shown that the characteristics of the laser radar is significantly degraded due to the deterioration of the patterns, if a conventional high power laser of W-class is applied to wireless uses. The design method was derived to smooth the radiation pattern of a broad area laser which is most promising for these applications.It is contrived to shape a sub-reflector and a lens in the feed system of a high-performance optical antenna as the reflector shaping method which is most tolerant to manufacturing errors. The validity was shown through simulation.Strong illuminating and receiving lights are obtained by spatially superimposing the output powers from plural lasers. And it is possible to restrict the speckle effect which is significant in a single mode laser. This fact was confirmed experimentally.