Technical methods for SLR daylight tracking

The daylight tracking observation is necessary and the tendency of Satellite Laser Ranging (SLR) in the future. More than half of the SLR stations in the world can take the daylight tracking observations. From the experience of the most successful stations around the world, Changchun station has been working on the daylight tracking technique in recent years. This paper introduces the performance and progress for SLR system daylight tracking in Changchun station. It first introduces the problems and difficulties facing this system for daylight tracking-mount model, the separation of emitting and receiving parts of the telescope, control range gate, and installing narrower filter. Secondly, it presents some work which has been done in the system for daylight tracking: system stability improvement, laser stability improvement, mount model adoption, control system, etc. From these analysis and work which has been done, the system performance has been greatly improved. A routine operation system for daylight tracking observation has been set up.