BeiDou Global Navigation Satellite System (BDS-3) not only performs the normal positioning, navigation and timing (PNT) functions, but also provides featured services, which are divided into geostationary orbit (GEO) and medium earth orbit (MEO) satellite-based featured services in this paper. The former refers to regional services consisting of the regional short message communication service (RSMCS), the radio determination satellite service (RDSS), the BDS satellite-based augmented service (BDSBAS) and the satellite-based precise point positioning service via B2b signal (B2b-PPP). The latter refers to global services consisting of the global short message communication service (GSMCS) and the MEO satellite-based search and rescue (MEOSAR) service. The focus of this paper is to describe these featured services and evaluate their performances. The results show that the inter-satellite link (ISL) contributes a lot to the accuracy improvement of orbit determination and time synchronization for the whole constellation. Compared with some other final products, the root mean squares (RMS) of the BDS-3 precise orbits and broadcast clock are 25.1 cm and 2.01 ns, respectively. The positioning accuracy of single frequency is better than 6 m, and that of the generalized RDSS is usually better than 12 m. For featured services, the success rates of RSMCS and GSMCS are better than 99.9% and 95.6%, respectively; the positioning accuracies of single and dual frequency BDSBAS are better than 3 and 2 m, respectively; the positioning accuracy of B2b-PPP is better than 0.6 m, and the convergence time is usually smaller than 30 min; the single station test shows that the success rate of MEOSAR is better than 99%. Due to the ISL realization in the BDS-3 constellation, the performance and capacities of the global featured services are improved significantly.

北斗三号卫星全球导航系统（BDS-3）除执行正常的PNT定位导航授时功能外，还提供特色服务，分为地球静止轨道（GEO）和中地球轨道（MEO）星基本文中的特色服务。前者是指区域服务，包括区域短消息通信服务（RSMCS）、卫星无线电测定服务（RDSS）、北斗星基增强服务（BDSBAS）和基于B2b信号的星基精密单点定位服务（ B2b-PPP）。后者指的是全球服务，包括全球短消息通信服务（GSMCS）和 MEO 卫星搜索和救援（MEOSAR）服务。本文的重点是描述这些特色服务并评估它们的性能。结果表明，星间链路（ISL）对整个星座定轨和时间同步精度的提高有很大贡献。与其他一些最终产品相比，北斗三号精密轨道和广播时钟的均方根（RMS）分别为25.1 cm和2.01 ns。单频定位精度优于6 m，广义RDSS通常优于12 m。对于特色服务，RSMCS和GSMCS的成功率分别优于99.9%和95.6%；单频和双频BDSBAS定位精度分别优于3 m和2 m；B2b-PPP定位精度优于0.6 m，收敛时间通常小于30 min；单站测试表明MEOSAR的成功率优于99%。由于北斗三号星群实现ISL，全球特色服务的性能和容量得到显着提升。