GPS/VRS实时网络改正数生成算法研究

Study of the Real-Time Network Correction Generation Approach for GPS/VRS Technique

为提高厘米级网络GPS/VRS实时动态定位的精度和可靠性,系统地探讨VRS网络实时改正数的生成模型,并提出适用于中长距离参考站网络的电离层、对流层以及卫星轨道改正数计算的改进算法。结合四川GPS参考站网络（SGRSN）以及自主开发的虚拟参考站软件平台VENUS系统,对上述改正数生成算法进行试验验证,结果表明其大气误差改正数精度为2~4 cm,轨道误差的影响可基本消除,满足80 km以上中长距离稀疏参考站网络厘米级实时动态定位服务要求。

The methodology of the network correction generation approach is improved. The systemic error mitigating method for both the atmospheric delay and orbital error are proposed here to enhance the accuracy and the reliability of the precise centimeter level GPS/VRS positioning based on reference station network. Test data acquired from SGRSN （Sichuan GPS Reference Station Network） are used in the VENUS （VRS Enhanced Utility Software） system to evaluate the performance of the modeling techniques. The results demonstrate that distance-dependent errors can been effectively modeled suitable for long range GPS CORS network with station distance of 80 km or longer, the accuracy of the atmospheric correction is about 2 to 4 centimeter and the orbital correction error can be of sub-millimeter level.