基于偏振紫外光单次散射的非视距目标定位方 法研究

Research on non-line-of-sight target location method based on single scattering of polarized ultraviolet light

本文从紫外光通信技术的发展趋势及研究背景出发,针对特定环境下实现目标定位的应用需求,结合偏振光的振动特性,提出了基于偏振紫外光单次散射实现非视距目标定位的方法。首先,基于紫外光大气散射传输特性,建立了偏振紫外光非视距单次散射模型,利用矩阵光学的方法推导了紫外光偏振散射传输特性;建立了接收光强与方位角及收发距离之间的关系。其次,利用Matlab软件仿真并分析了收发仰角及视场角对接收光强及方位角测量范围的影响,选取了合适的收发仰角及视场角。根据接收信号光强随方位角的变化获得目标方位角,并通过解算得出收发距离,理论上验证了系统可行性,并对各误差影响进行了仿真分析,在距离500m,收发仰角偏离(预设值25°)3°时,距离测量误差为25.3m。噪声对光强的影响导致方位角判定误差对测距误差的影响较小,但方位角判定误差为3°时,会引起距离500m时真实位置横向偏离误差26.2m。本文研究结果为拓展紫外光通信系统的功能及实际应用提供了理论基础,有一定的指导意义。

This paper starts from the development trend and research background of ultraviolet(UV)optical communication technology,for the application requirements of target localization in specific environments,a method based on single scattering of polarized ultraviolet light to achieve non-line-of-sight target localization is proposed by combining the vibration direction characteristics of polarized light.Firstly,based on the UV atmospheric scattering transmission characteristics,apolarized UV non-line-of-sight single scattering model is established,and the polarization scattering propagation characteristics of ultraviolet light is derived by the method of matrix optics.The relationship between the received light intensity and azimuth angle and distance between transmitter and receiver is established.Then,the Matlab software is used to simulate and analyze the effect of transmitter and receiver elevation angle and field of view angle on the received light intensity and azimuth angle measurement range,and the suitable transmitter and receiver elevation angle and field of view angle are selected.The azimuth angle of the target is obtained according to the change of the light intensity of the received signal with the azimuth,and the distance between transmitter and receiver is calculated.In theory,the feasibility of the system is verified,and the simulations and analyses of each error influence are carried out.At a distance of 500m,the distance measurement error is 25.3mwhen the transmitter and receiver elevation angle deviates 3°(preset value 25°).The influence of noise on the light intensity leads to the azimuth angle determination error to have a small effect on the ranging error,but the azimuth angle determination error of 3°can cause a lateral deviation error of 26.2mfrom the true position at a distance of 500m,thus improvement measures are proposed.The results of this paper provide a theoretical basis for expanding the functions and practical applications of UV optical communication systems and have certainguiding significance.