Basu Santasri, Voelz David
Klipsch School of Electrical and Computer Engineering, New Mexico State University, Las Cruces, New Mexico 88003, USA.
J Opt Soc Am A Opt Image Sci Vis. 2008 Jul;25(7):1594-608. doi: 10.1364/josaa.25.001594.
Establishing a link between a ground station and a geosynchronous orbiting satellite can be aided greatly with the use of a beacon on the satellite. A tracker, or even an adaptive optics system, can use the beacon during communication or tracking activities to correct beam pointing for atmospheric turbulence and mount jitter effects. However, the pointing lead-ahead required to illuminate the moving object and an aperture mismatch between the tracking and the pointing apertures can limit the effectiveness of the correction, as the sensed tilt will not be the same as the tilt required for optimal transmission to the satellite. We have developed an analytical model that addresses the combined impact of these tracking issues in a ground-to-satellite optical link. We present these results for different tracker/pointer configurations. By setting the low-pass cutoff frequency of the tracking servo properly, the tracking errors can be minimized. The analysis considers geosynchronous Earth orbit satellites as well as low Earth orbit satellites.
利用卫星上的信标可以极大地辅助地面站与地球同步轨道卫星之间建立链路。在通信或跟踪活动期间，跟踪器甚至自适应光学系统可以使用该信标来校正由于大气湍流和支架抖动效应导致的光束指向。然而，照亮移动目标所需的指向提前量以及跟踪孔径与指向孔径之间的孔径失配会限制校正的有效性，因为感测到的倾斜与向卫星进行最佳传输所需的倾斜不同。我们已经开发了一个分析模型，该模型解决了这些跟踪问题在地面到卫星光链路中的综合影响。我们给出了不同跟踪器/指向器配置的这些结果。通过适当地设置跟踪伺服的低通截止频率，可以将跟踪误差最小化。该分析考虑了地球同步轨道卫星以及低地球轨道卫星。
