论文标题
光谱噪声形状和激光束抖动的相关性对在太空中获得光链的相关性
Impact of spectral noise shape and correlations of laser beam jitter on acquiring optical links in space
论文作者
论文摘要
我们研究了扫描和目标航天器之间获得光学连接的概率如何取决于光束抖动的频谱形状，功率和维度，以及检测器积分时间，梁检测半径和扫描速度的选择。对于缓慢的扫描和较长的集成时间，失败的可能性（PFAIL）由集成的抖动功率确定为临界频率，我们通过将分析模型的结果与蒙特卡洛模拟的结果进行比较来验证。高于临界频率的抖动会导致整合窗口之间的相关性丧失，并且只要RMS抖动幅度不超过光束直径，就可以减少1D（radial）和2D（径向和切向）抖动的Pfail。在快速扫描和短时间的相反限制下，两个相邻扫描轨道上的抖动波动之间的紧密相关也降低了PFAIL。该分析模型还用于评估多个重叠轨道的影响以及目标漂移在不确定性平面中的影响。
We investigate how the probability of acquiring an optical link between a scanning and a target spacecraft depends on the spectral shape, power and dimensionality of the beam jitter, as well as on the choice of detector integration time, beam detection radius and scan speed. For slow scans and long integration times, the probability of failure (Pfail) is determined by the integrated jitter power up to a critical frequency, which we verify by comparing the results of an analytical model to those of Monte Carlo simulations. Jitter above the critical frequency leads to a loss of correlation between integration windows and decreases Pfail for both, 1d (radial) and 2d (radial and tangential) jitter, as long as the RMS jitter amplitude does not exceed the beam diameter. In the opposite limit of fast scans and short integration times, emergent correlations between jitter fluctuations on two adjacent scanning tracks also decrease Pfail. The analytical model is additionally used to assess the effect of multiple overlapping tracks and the impact of target drifts in the uncertainty plane.
