使用水下激光遥测和远程访问的海底宽带

Ishan Mons, V. Veedu, J. Pollock, G. Nakafuji, H. Elshahawi, K. Jim, M. Hadmack
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引用次数: 0

摘要

由于声学固有的带宽限制和其他传输方式的范围限制,高速无线通信在海底环境中被证明是难以实现的。一个真正连接的海底系统需要一个高速、弹性的架构,可以集成新的传感器技术和边缘分析,并允许闭环监测和控制海底作业,以实现完整性监测和优化。与地面物联网应用一样,实现这种“数字海底”愿景需要应用高速、点对点无线技术,以补充而不是取代“硬有线”通信,如光纤或声学系统。这项工作涉及ULTRA(水下激光遥测和远程访问)的开发,这是一种超远程水下激光通信系统,用于水下通信架构的关键点,以提高可靠性、操作灵活性,并减少与海底物理连接相关的通信系统维护。为了演示ULTRA的数据容量和范围,构建了一个可灵活通过空气或水传输的亚尺度实验室点对点无线激光通信系统。测试系统对空气、淡水和不同水质的海水使用功率和调制频率。实现了光学和射频编码方法,以促进和表征通过各种媒体的数据传输。该实验室实验使用了一个亚尺度、滤波和衰减的5 mW蓝绿激光,在22米折叠路径配置中演示了使用单通道正交相移键控(QPSK)调制,以312兆比特每秒(Mbps)的数据速率实时传输数据。现场原型ULTRA系统将使用未衰减的5mw激光,在清晰的条件下,以312 Mbps的速度可以达到约280米的范围,这是深水海底的典型条件。激光功率和数据速率的选择被认为是水下航行器运行环境下的操作权衡。ULTRA的扩展范围可以支持各种用例,极大地增强海底数据通信能力,从而实现“数字化海底”。
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Subsea Broadband Using Underwater LASER Telemetry and Remote Access
High speed wireless communication has proven elusive in subsea environments due to the inherent bandwidth limitations of acoustics and range limitations of other transmission modalities. A truly connected subsea system necessitates a high-speed, resilient architecture that can enable the integration of new sensor technologies and edge analytics and allow closed-loop monitoring and control of subsea operations for integrity monitoring and optimization. Like terrestrial Internet of Things applications, the realization of this "digital subsea" vision requires the application of high speed, point-to-point wireless technologies to complement rather than replace "hard-wired" communications such as optical fiber or acoustic systems. This work addresses the development of ULTRA (Underwater LASER Telemetry and Remote Access), an ultra-long range underwater laser communications system for use in critical points of the subsea communications architecture to increase reliability, operational flexibility, and reduce communication system maintenance associated with physical subsea connections. To demonstrate the data capacity and range of ULTRA, a subscale laboratory point-to-point wireless laser communication system was constructed with the flexibility to transmit through either air or water. The test system used power and modulation frequencies for air, fresh water, and different qualities of seawater. Optical and RF encoding methodologies were implemented to facilitate and characterize data transmission through the various media. The laboratory experiment used a subscale, filtered, and attenuated 5 mW blue-green laser in a 22-meter folded path configuration to demonstrate real-time data transmission at 312 Megabit per Second (Mbps) data rate using single channel Quadrature Phase Shift Keying (QPSK) modulation. A field prototype ULTRA system will use an unattenuated 5 mW laser that can reach approximately 280-meter range at 312 Mbps in clear conditions, which are typical of deepwater subsea. The selection of laser power and data rate are considered operational tradeoffs in environments where underwater vehicles operate. The extended range of ULTRA can enable various use cases to greatly augment subsea data communications capacity to enable the "Digital Subsea".
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