A bidirectional Ultra-Wideband (UWB) localization scheme is one of the three widely adopted design integration processes commonly used in time-based UWB positioning systems. The key property of bidirectional UWB localization is its ability to serve both navigation and tracking tasks within a single localization scheme on demand. Traditionally, navigation and tracking in wireless localization systems were treated as separate entities due to distinct applicable use-cases and methodological needs in each implementation process. Therefore, the ability to flexibly or elastically combine two unique positioning perspectives (navigation and tracking) within a single scheme can be regarded as a paradigm shift in the way location-based services are conventionally observed. This article reviews the mentioned bidirectional UWB localization from the perspective of a flexible and versatile positioning topology and highlights its potential in the field. In this regard, the article comprehensively describes the complete system model of the bidirectional UWB localization scheme using modular processes. It also discusses the demonstrative evaluation of two system integration processes and conducts a SWOT (Strengths, Weaknesses, Opportunities, and Threats) analysis of the scheme. Furthermore, the prospect of the presented bidirectional localization scheme for achieving precise location estimation in 5G/6G wireless mobile networks, as well as in Wi-Fi fine-time measurement-based positioning systems was briefly discussed.

翻译：双向超宽带（UWB）定位方案是基于时间测量的UWB定位系统中三种广泛应用的设计集成方案之一。其核心特性在于，能够在单一定位方案中按需同时支持导航与追踪任务。传统上，由于无线定位系统中的导航与追踪在具体应用场景和方法需求上存在显著差异，两者通常被视作独立实体。因此，在单一方案中灵活或弹性整合两种截然不同的定位视角（导航与追踪），可视为对位置服务传统认知范式的革新。本文从灵活且多功能的定位拓扑视角出发，综述了上述双向UWB定位方案，并重点阐述了该领域的发展潜力。为此，本文通过模块化流程系统性地描述了双向UWB定位的完整架构模型，论证了两种系统集成方案的演示评估，并对该方案开展了SWOT（优势、劣势、机遇与威胁）分析。此外，本文还简要探讨了所提出的双向定位方案在5G/6G无线移动网络以及基于Wi-Fi精细时间测量定位系统中实现精确定位估计的应用前景。