Real Time Kinematic (RTK) systems, together with Global Navigation Satellite System (GNSS) networks, are real-time location systems that are widely used in precision agriculture for autoguidance systems in farm vehicles. The RTK uses a reference signal from a base station, and the accuracy of the autoguidance system depends strongly on the signal quality arriving at the receiver that is installed in the vehicle or rover. In this paper, the relationship between the accuracy of the autoguidance systems and the propagation losses between the vehicle and the reference station is studied. The Covermap software tool, which was developed by the authors and validated with measurements, is used to determine the propagation losses. The advantage of this tool is that it allows analyzing any environment because it uses real geographical terrain data obtained from OpenStreetMap. In addition, the results are obtained instantaneously. A study was performed to analyze if the use of the Covermap tool in open environments improves the accuracy of guidance systems. In the study, an agricultural vehicle was connected to different reference stations, also called CORS (Continuously Operating Reference Stations), near the work location. The relationship between the propagation losses predicted by Covermap and the vehicle’s drift when connecting to each of these stations was determined. The stations that presented lower propagation losses resulted in less drift. This kind of software tools are very useful for determining the best reference station to which the rover should connect at any moment not according to the criterion of proximity but rather according to propagation losses.

实时动态 (RTK) 系统与全球导航卫星系统 (GNSS) 网络一起，是实时定位系统，广泛用于精准农业，用于农用车辆的自动导航系统。RTK 使用来自基站的参考信号，自动导航系统的准确性在很大程度上取决于到达安装在车辆或流动站中的接收器的信号质量。本文研究了自动导航系统的精度与车辆与参考站之间的传播损耗之间的关系。由作者开发并经过测量验证的 Covermap 软件工具用于确定传播损耗。这个工具的优点是它允许分析任何环境，因为它使用从 OpenStreetMap 获得的真实地理地形数据。此外，结果是即时获得的。进行了一项研究，以分析在开放环境中使用 Covermap 工具是否可以提高制导系统的准确性。在研究中，农用车辆连接到工作地点附近的不同参考站，也称为 CORS（连续运行参考站）。确定了 Covermap 预测的传播损耗与车辆在连接到每个站点时的漂移之间的关系。传播损耗较低的站导致漂移较小。