单频GPS/BDS组合变形监测系统精度测试

Test on precision of combined single-frequency GPS/BDS deformation monitoring system

为测试单频GPS/BDS组合变形监测系统的精度,选择在五强溪库岸边坡环境,采用人工变形模拟位移装置进行了多组精度测试实验数据采集,并采用自主研发的GPS/BDS组合变形监测数据处理软件进行数据处理。结果表明,在该库岸边坡变形监测环境下,单频GPS/BDS组合变形监测系统的定位精度优于GPS、BDS单系统,其定位精度比单频GPS系统在E方向提高0.8mm,N方向提高1.2mm,U方向提高4.5mm。说明在有较多遮挡的变形监测环境中,GPS/BDS组合系统能明显改善监测精度。

To test the precision of combined single frequency GPS/BDS deformation monitoring system,multiple tests with artificial simulation displacements were conducted on the left bank slope of Wuqiangxi dam. The collected test data were processed using the combined GPS/BDS deformation monitoring data processing software which developed by the GNSS research team in Central South University. The results show that,in the deformation monitoring environment,the precision of the combined single frequency GPS/BDS deformation system is higher than that of single GPS or BDS deformation monitoring system. The precision of combined GPS/BDS deformation system is improved by 0. 8mm,1. 2mm,4. 5mm in E,N,U directions respectively. It implies that the combined GPS/BDS deformation system can obviously improve the monitoring accuracy in real complex deformation monitoring environments with masked objects.