基于激光雷达观测数据的无线光通信系统性能研究

Research on the performance for free space optical communication system with the observation data from LADAR

在分析大气衰减效应对无线光(FSO)通信性能影响时,获取及时准确的能见度数据是关键。首先,分析了目前获取能见度方法的不足之处,提出由激光雷达(LADAR)反演得到的数据可以更好地满足FSO通信性能分析的需求;其次,在介绍了利用LADAR观测数据反演水平能见度方法的基础上,以烟台1月18日典型天气为例,获取了全天的能见度数据,并结合80%的相对湿度阈值对雾霾的转化过程进行分析;最后,结合实测数据,通过设置适当的通信系统参数,对该日天气条件下的误码率(BER)进行了实时分析,并得出雾比霾更容易引起通信系统性能的降低。本文所得结论,将为建立实际的FSO通信链路提供指导。

The accurate and timely visibility data is a crucial factor when the effect of atmospheric attenu- ation on the performance of free space optical （FSO） communication system is analyzed. Firstly, the shortcoming of the current method with obtaining the visibility data is pointed out,and the inversion data of laser radar （LADAR） is very suitable for estimating the performance of FSO link. Secondly,the way of inverting the horizontal visibility data from the laser radar observation data is introduced, and then the all day visibility data is received on January 18 because there is special weather in Yantai region. At the same time, combining the 80 % threshold value of relative humidity, the conversion process between fog and haze is analyzed briefly on that day. Lastly, based on the measured value of the laser radar, the bit error rate performance of FSO communication （BE_R） is analyzed in real time under the special weather condition by setting some appropriate parameters. The analysis results show that fog is far more likely to cause the BER performance degradation of FSO communication system than haze. The conclusion of this paper will provide very valuable guidance for building the practical FSO communication link in this re- gion.