空间飞行器中可见光通信系统布局及性能分析

Layout and Performance Analysis of Visible Light Communication System in Spacecraft

传统的室内可见光通信研究考虑的场景规则比较固定,比如选用5×5×3的房间模型。为丰富可见光通信的利用场景,更加贴合实际需要,建立空间飞行器非规则场景,考虑长度的变化以满足不同的需要。为节省能量,通过遗传算法优化灯源布局,动态分析灯源数目、每个灯珠功率与飞行器长度之间的关系,以寻求合适方案。以往研究中每个灯珠功率通常为0.02W,当长度变化时就要增加灯源数目但可能造成资源浪费。如长度为5m,每只灯珠功率为0.02W时,所需功率为360W,但信噪比有效区域只有88.32%,不能满足需求。新方法不需要增加灯源数目,只需将灯珠功率调整为0.022W,所需功率即为316.8W,相比之下节省12%的功率,有效节省了能量,避免了能量浪费。

In the traditional indoor visible light communication research,the scenarios considered are relatively fixed,compared with the room model of 5*5*3.In order to enrich the utilization scene of visible light communication and meet the practical needs,the scene established in this paper is an irregular scene such as a space vehicle,and the change of length is considered to meet different needs.In order to save energy,the layout of lamp source is optimized by genetic algorithm,and the relationship between the number of lamp source,the power of each lamp bead and the length of aircraft is dynamically analyzed to find a suitable scheme.For previous studies,usually the power of each lamp bead is 0.02 W,when the length changes,it is possible to waste resources only by increasing the num⁃ber of lamp sources.In previous studies,the power of each lamp bead is 0.02w.When the length changes,we can only increase the number of light sources,which may cause waste of resources.For example,when the length is 5 meters and the power of each lamp bead is 0.02w,if only increasing the number of light sources,the required power is 360W,but the effective area of signal-to-noise ra⁃tio is only 88.32%,which can not meet the demand.The new method does not need to increase the number of lamp sources,and only needs to adjust the lamp bead power to 0.022w,and the required power is 316.8w,which saves 12%power.Therefore,the analysis method in this paper can effectively save energy and avoid energy waste.