激光水下通讯误码率的影响

Influence of bit-error rate in laser underwater communications

蓝绿激光水下通信技术是水下激光引信探测技术的研究基础。对蓝绿激光加载数字脉冲信号后在水下的通讯效果进行了研究,分析了引起蓝绿激光水下传输衰减的因素,设计了蓝绿激光水下信号传输实验系统,测试了光发射接收组件在不同水质和不同距离下的通信误码率。实验结果显示信号传输误码率在纯水和空气中的变化并不明显,但水中杂质浓度的增加使得信号传输误码率发生急剧变化。实验证明:悬浮粒子散射是引起激光水下通讯误码的主要原因;通过使用连续型蓝绿激光通信,可以提高通信速率和灵敏度,降低误码率。

The blue-green laser underwater communications technology is the research base of the underwater laser fuse detection technology. The light absorption and scattering caused by a wide variety of seawater compositions make the laser attenuation underwater more complex than in air. In this paper, the underwater communication effects of blue-green laser which loads digital pulse signal was studied. The factors that cause transmission losses were analyzed. It provided the design of the blue-green laser underwater signal transmission experimental system to test the communication error rate of the light emission ＆ receiving components at different distances and under different aqueous media. Experiments show that the bit-error rate almost remains invariable in the pure water and air, but increases with the concentration of the impurity in water. It verifies that the laser underwater communication error is mainly caused by particulate scattering, and the use of continuous laser source can increase the communication speed and sensitivity, and reduce the error rate.