Diversity receiving technology of ultraviolet approximate-line-of-sight communication in helicopter assisted landing

ZHAO Taifei; YANG Liyang; LENG Yuxin; MA Qianwen

doi:10.7510/jgjs.issn.1001-3806.2019.02.017

LASER TECHNOLOGY > 2019 > 43(2): 238-245. > DOI: 10.7510/jgjs.issn.1001-3806.2019.02.017

ZHAO Taifei, YANG Liyang, LENG Yuxin, MA Qianwen. Diversity receiving technology of ultraviolet approximate-line-of-sight communication in helicopter assisted landing[J]. LASER TECHNOLOGY, 2019, 43(2): 238-245. DOI: 10.7510/jgjs.issn.1001-3806.2019.02.017

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Diversity receiving technology of ultraviolet approximate-line-of-sight communication in helicopter assisted landing

1.
Department of Electronic Engineering, College of Automation and Information Engineering, Xi'an University of Technology, Xi'an 710048, China
2.
Sichuan Key Laboratory of Special Environment Robotics, Southwest University of Science and Techno-logy, Mianyang 621010, China

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Received Date: April 18, 2018
Revised Date: May 30, 2018
Published Date: March 24, 2019

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Abstract

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 22dB, 18dB and 16dB 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.
- optical communication,
- atmospheric turbulence,
- diversity reception,
- helicopter assisted landing

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