黑龙江基准站网虚拟格网化厘米级增强定位算法

An algorithm for virtual grid augmentation position with centimeter level based on reference station network in Heilongjiang province

针对基准站网的厘米级大用户增强定位的问题,提出了一种单虚拟点多用户的1∶n的虚拟格网技术方法,对用户双差大气延迟的内插残差和未内插的差分残差分别采用LIA内插模型和基线梯度进行分析,从而依照格网划分步骤选出最优的格网大小。通过黑龙江基准站网实测验证,格网划分为4′×4′时用户点位标准差N、E和U方向达到0.88、1.32和1.61 cm,能够实现基准站网的厘米级增强定位服务。

In order to improve the centimeter-level positioning service capability of large users of the reference station network,this paper proposes an improved 1∶n grid technology method of single virtual point and multi-user.The interpolated residual and non interpolated difference residual of user double difference atmospheric delay are analyzed by LIA interpolation model and baseline gradient respectively,so as to select the optimal grid size according to the grid division steps.According to the experimental verification of Heilongjiang reference network,the grid is divided according to the density of 4′×4′grid,and the standard deviation of user point position in N,E and U directions are 0.88,1.32 and 1.61 cm respectively,which can realize the centimeter-level enhanced positioning service of the reference network.