水下PNT体系信息架构及关键问题

卫星导航系统固有的弱点与脆弱性制约了其水下应用，因此针对水下用户的定位导航授时（PNT）信息需求，迫切需要建设可提供全时全域、实用有效、安全可靠的PNT信息服务的水下PNT体系。针对水下PNT体系的顶层设计问题，重点探讨了PNT体系架构的核心信息架构设计及相关关键问题。系统分析了水下PNT体系建设的特殊性以及水下用户对于水下PNT服务的需求。在水下PNT体系构建原则的基础上，重点介绍了感知层、预处理参量层、本地时空参数层、环境信息层、多源信息融合层、系统应用服务层、体系服务管理层等七层水下PNT信息体系架构。总结了水下PNT体系构建时所涉及的关键科学问题和技术问题，并分析了后续水下PNT体系的主要研究方向。

Information Architecture and Key Issues of Underwater PNT System

The inherent weakness and vulnerability of satellite navigation system restrict its underwater application. Therefore, it is urgent to build an underwater PNT (UPNT) system that can provide real-time, all-domain, practical, effective, safe and reliable PNT information service for underwater users. Aiming at the top-level design of UPNT system, this paper focuses on the core information architecture design and related key issues of PNT architecture. The particularity of UPNT system construction and the requirements of the users for UPNT service are analyzed systematically. The principles in the construction of UPNT system is proposed, and the seven-layer information architecture of UPNT is emphasized, which includes perception layer,pretreatment parameters layer, local space-time parameter layer, environmental information layer, multi-source information fusion layer, system application service layer and service management layer. The main scientific and technical problems involved in the construction of UPNT system are summarized. And the subsequent research directions of UPNT system are discussed.