偏振调能技术对SLR数据偏差的改善研究

发布时间：2018-03-19 15:20

本文选题：卫星激光测距　切入点：地靶校准　出处：《红外与激光工程》2017年09期 　论文类型：期刊论文

【摘要】：改善激光观测数据偏差对推动毫米级精度卫星激光测距(Satellite Laser Ranging,SLR)技术在全球大地测量观测系统中应用具有重要作用。系统时延标定误差是激光观测数据偏差产生的主要原因,其中地面靶目标测量与卫星测量时的系统差异,以及单光子探测中激光回波强度所引起的光子探测时间游动误差是主要因素。以上海天文台SLR系统为平台,对上述两种测量模式下系统时延及激光回波强度差异进行了分析和修正。利用激光偏振特性,应用半波片-偏振片组合调能技术,实现两种测量模式下光路的"零差异"切换以及回波强度的实时控制,有效减少光路不同和探测器时间游动效应,激光数据偏差改善了10~20 mm,达到了国际SLR数据质量标准要求。激光偏振技术也可用于高重复率激光测距的激光后向散射规避,提高激光回波数,具有很好的应用推广价值。
[Abstract]:Improving the deviation of laser observation data plays an important role in promoting the application of the millimeter precision satellite Laser ranging SLR technology in the global geodetic observation system. The system delay calibration error is the main cause of the laser observation data deviation. The system difference between the ground target measurement and the satellite measurement, and the error caused by the laser echo intensity in the single photon detection are the main factors. The SLR system of Shanghai Observatory is used as the platform. The difference of system delay and laser echo intensity in the two measuring modes is analyzed and corrected. Based on the polarization characteristics of laser, the combined energy regulation technique of half-wave plate and polarizer is used. The "zero difference" switching of optical path and the real-time control of echo intensity are realized in two measuring modes, which can effectively reduce the effect of different optical paths and detector time walks. The deviation of laser data has been improved by 10 ~ 20 mm, which meets the requirements of international SLR data quality standard. Laser polarization technology can also be used to avoid laser backscattering in high repetition rate laser ranging, and to increase the number of laser echo, which has a good value of application and popularization.
【作者单位】：中国科学院上海天文台;
【基金】：国家自然科学基金(11303074,U1631240,11503068)
【分类号】：P228.5

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