激光技术2019，Vol.43Issue(2)：238-245,8.DOI:10.7510/jgjs.issn.1001-3806.2019.02.017
直升机助降中紫外光近直视通信分集接收技术
Diversity receiving technology of ultraviolet approximate-line-of-sight communication in helicopter assisted landing
摘要
Abstract
In order to effectively suppress the strong turbulence effect caused by the wake of helicopter during landing, diversity reception technology was used for suppression. According to the characteristics of wireless ultraviolet slant communication and approximate-line-of-sight (ALOS) communication, the probability density function of edge distribution of the received signal strength was given. The correction model of UV ALOS communication system based on gamma-gamma distribution was established. The diversity reception technology was introduced into the model. The influence of turbulence effect on the edge probability density distribution of optical signal intensity was analyzed theoretically. Bit error performances of maximal ratio combining (MRC), equal gain combining (EGC) and selective combining (SC) were analyzed. The results show that, the stronger the turbulence intensity is, the worse the bit error rate performance of UV ALOS system is. With two diversities, the signal-to-noise rates of MRC, EGC and SC have increased 22 dB, 18 dB and 16 dB respectively. The diversity reception technology can effectively suppress the strong turbulence effect in helicopter assisted landing and improve the stability and anti-fading performance of communication system.关键词
光通信/大气湍流/分集接收/直升机助降Key words
optical communication/atmospheric turbulence/diversity reception/helicopter assisted landing分类
信息技术与安全科学引用本文复制引用
赵太飞,杨黎洋,冷昱欣,马倩文..直升机助降中紫外光近直视通信分集接收技术[J].激光技术,2019,43(2):238-245,8.基金项目
国家自然科学基金资助项目(U1433110) （U1433110）
陕西省教育厅科研计划资助项目(17-JF024) （17-JF024）
西安市碑林区科技计划资助项目(GX1617) （GX1617）
西南科技大学特殊环境机器人技术四川省重点实验室开放基金资助项目(17kftk04) （17kftk04）
