非视线单次散射大气传输模型研究

Study on non-line-of-sight single-scatter atmospheric propagation model

为了研究波长为1.06μm的红外激光散射通信系统各种几何参量对系统性能的影响,利用非视线单次散射大气传输模型分析了接收机、发射机的收发视场、俯仰角以及传输距离等几何参量对接收机接收功率和路径传输损耗的影响。结果表明,增大接收机的视场可以提高探测到的散射光信号功率,而增加发射机的发散角则基本不影响接收到的信号功率;在其它参量不变的情况下,增大接收机或者发射机的仰角都减小了接收机的探测到的信号功率;在散射角和传输距离一定的情况下,适当地降低发射机的仰角可以提高接收机探测到的散射光信号功率。这些结果对系统设计有一定的参考价值。

In order to study the impact of geometry of the transceiver in the non-line-of-sight system working at the wavelength of 1.06μm, based on a single-scatter atmospheric propagation model, the impact of the field-of-view （FOV） of the transceiver, pitching angle and transmitting distance on the received signal power and path loss was studied by means of numerical calculation. It is shown that a larger F0V may significantly enhance the detected laser power, while the increase of transmitter beam divergence does not make any difference. It is also indicated that decreasing either the apex angle of the transmitter or receiver makes the detection of the weak scattering signal more difficult while other parameters remain the same. It is shown that decreasing the apex angle of the transmitter appropriately helps the signal detection for a certain scattering angle and transmitting distance. These results are valuable in system design.