Precise point positioning (PPP) with augmentation by a network of continuously operating reference stations (CORS), known as PPP-RTK, enables fast ambiguity resolution with PPP. However, it suffers from the dependency of a CORS network for augmentation corrections generation. This paper proposes a new real-time PPP-RTK method that generates the augmentation corrections using undifferenced and uncombined PPP at a single reference station. This method enables high accuracy and fast convergence real-time PPP-RTK for both multi-frequency and single-frequency receivers without the need of PPP estimate convergence at the reference station. It provides potential flexibility to include any number of more local reference stations for augmentation correction generation. The method can be regarded as a state-space-representation based RTK approach that offers equivalent performance but can overcome the limitations associated with the observation-space-representation based positioning techniques, such as the high transmission rate and rigorous baseline length requirements. It can also be considered as a special case of the network-based PPP-RTK but it offers increased flexibility in system implementation and opens doors to develop new correction services for PPP-RTK applications. Field tests results validate the positioning performance of the proposed method. The static positioning test indicates that the method could instantly output cm-level positioning solutions even before the corrections estimate convergence at the reference station. And the kinematic vehicle-based test reveals that, the method can provide the rover station receiver cm-level positioning solutions with instant initialization and ambiguity resolution either using a dual-frequency Global Navigation Satellite System (GNSS) receiver or a low-cost single-frequency GNSS receiver with 100% ambiguity fix rate. Also, the test results with different baseline lengths prove that the proposed method will be gradually degraded into standard AR-enabled PPP when the baseline length grows longer, and the ambiguity can be effectively fixed even at the 1258 km baseline length.

通过称为 PPP-RTK 的连续运行参考站 (CORS) 网络进行增强的精确点定位 (PPP) 可以通过 PPP 实现快速模糊度解决。然而，它受到 CORS 网络对增强校正生成的依赖性的影响。本文提出了一种新的实时 PPP-RTK 方法，该方法在单个参考站使用非差分和非组合 PPP 生成增强校正。该方法能够为多频和单频接收机实现高精度和快速收敛的实时 PPP-RTK，而无需在参考站进行 PPP 估计收敛。它提供了潜在的灵活性，可以包含任意数量的更多本地参考站以生成增强校正。该方法可以被视为一种基于状态空间表示的 RTK 方法，它提供了等效的性能，但可以克服与基于观测空间表示的定位技术相关的限制，例如高传输速率和严格的基线长度要求。它也可以被视为基于网络的 PPP-RTK 的一个特例，但它在系统实施方面提供了更大的灵活性，并为为 PPP-RTK 应用开发新的校正服务打开了大门。现场测试结果验证了所提出方法的定位性能。静态定位测试表明，该方法甚至可以在校正估计参考站收敛之前立即输出厘米级定位解。基于运动学车辆的测试表明，该方法可以使用双频全球导航卫星系统（GNSS）接收器或具有100％模糊定位率的低成本单频GNSS接收器为流动站接收器厘米级定位解决方案提供即时初始化和模糊度分辨率。此外，不同基线长度的测试结果证明，当基线长度变长时，所提出的方法将逐渐退化为标准的支持 AR 的 PPP，即使在 1258 km 的基线长度上也能有效地固定模糊度。