测绘地理信息

由于3个或以上物理基准站的坐标和观测数据属于控制数据，不能在公共网络上发播和使用，这很大程度上限制了网络实时动态（real-time kinematic,RTK）系统在公共服务如自动驾驶、高精度导航中的使用。而非物理观测站的虚拟观测数据是可公开使用的数据，能在公共网络中传输和使用，因此介绍了虚拟基准站观测值的生成方法，并在此基础上提出一种基于BDS/GNSS(BeiDou navigation satellite system/global navigation satellite system)虚拟基准站建立区域误差模型来实现网络RTK播发服务的方法。实验结果表明，在满足基准站数据可控的条件下，该方法可以实现平面优于3 cm，高程优于5 cm的实时定位精度，与物理基准站网络RTK系统具有同等定位性能。

The coordinates and observation data of three or more physical reference stations are secret and cannot be broadcasted and used on public network,which largely limits the use of Network RTK system in public services,such as automatic driving,high-precision navigation and so on. However,the virtual station observation data of physical observation stations can be transmitted and used in public network.Therefore,this paper first introduces the generation method of observation values of virtual reference stations and then proposes a regional atmosphere error model based on BDS/GNSS virtual reference station observation data to provide network RTK broadcasting service for RTK users. The experimental results of the network RTK system based on virtual reference stations show that the horizontal accuracy is better than 3 cm and the vertical accuracy is better than 5 cm. This method can meet the secret requirement of the laws and attain the same performance as the physical reference station network RTK system.