双波长卫星激光测距系统的建立和应用

Satellite Laser Range (SLR) is capable to provide the most accurate range measurements for single-shot observation among satellite positioning techniques. With the development of sub-centimeter technique, SLR has done more extensive application in astrogeodynamic and space sciences. In order to meet the needs of the research, the demand of millimeter precision for SLR has been proposed. Currently, atmospheric correction is considered as one of the most important contributions to the error sources for satellite ranging. Two color laser ranging to satellite is unique to provide millimeter precision atmospheric correction, by measuring the differential time interval between the returns of two wavelengths from satellites.The project aims to establish of SLR system with millimeter precision by two color wavelength technique, which measures atmospheric delay and satisfy research needs.The research field of the project includes to design two-color laser equipment, to adopt dual-channel receivers and multi-counter technique.We have set up two color laser system with high conversion efficiency and better beam characteristic in space, and solve laser energy output fluctuate and wave configure unstable. In collaboration with Czech technical university, we adopted picosecond event timer, instead of multi-counter to carry out the experiment of SLR with sub-centimeter precision. These results are very useful for two-color SLR to obtain atmospheric correction at millimeter precision..

研制用于卫星激光测距的两种波长输出的激光器件，采用双通道同时接收、多台计数器记录、以及高精度时间游动补偿等技术，建立我国首台具有双波长测距能力的卫星激光测距系统。利用该系统对地面和卫星的实测，可直接测量出比目前大气改正模型更高精度的大气修正值，进一步提高卫星测距精度。该项研究将使我国激光测距技术进入世界前列。