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在地表形变监测中,若全采用双频GPS则费用过高,若全采用单频GPS则因电离层误差得不到较好消除而导致精度下降。针对这一问题,本文采用GPS单双频混合模式,即通过解算监测区域外围的双频GPS数据获取该区域大气延迟误差残余量,将其用于改正内部单频监测站点数据,从而在降低硬件成本的同时改善监测精度。利用研发的软件对实测数据进行处理分析,结果表明,改正后的高程分量精度优于1.24cm,三维位置精度优于1.59cm,较单频方法提高24%;且当单频站点位于双频站点组成的区域内部时改正效果更好,高程分量精度优于0.95cm,三维位置精度优于1.2cm,精度改善比例达到30%,最高可达58%。
In the monitoring of surface deformation, if the dual-frequency GPS is used, the cost is too high. If the single-frequency GPS is adopted, the precision will not be well canceled because of the ionospheric error. In order to solve this problem, this paper adopts GPS single-dual-frequency mixed mode to obtain the atmospheric residual error of the region by solving the dual-frequency GPS data in the periphery of the monitoring area, which is used to correct the internal single frequency monitoring site data, Improve hardware cost while monitoring accuracy. The results show that the corrected elevation component accuracy is better than 1.24cm, the three-dimensional position accuracy is better than 1.59cm, which is 24% higher than that of the single-frequency method. And when the single-frequency site is located at the dual-frequency site When the internal area is composed, the correction is more effective. The accuracy of elevation component is better than 0.95cm, the accuracy of three-dimensional position is better than 1.2cm, the precision improvement ratio is up to 30% and the maximum is up to 58%.