BDS-3+BDS-2双频数据高精度工程测量网应用试验及分析

Application experiment and analysis of high-precision engineering surveying network for BDS-3+BDS-2 dual-frequency data

鉴于当前北斗系统提供BDS-3+BDS-2联合服务,本文提出了BDS网数据处理模型并建立了基于BDS-3+BDS-2双频数据的高精度工程测量网,并进行了应用试验。选择4个同时支持BDS-3+BDS-2、GPS双频数据的CORS站布设高精度工程测量网进行数据处理,从相位观测值精度、验后标准化均方根误差、基线向量质量、基线重复性及网平差点位坐标结果做了比较分析与评估。试验结果表明,利用BDS-3+BDS-2的B1I、B3I双频数据建立的高精度工程测量网,所获得点位坐标结果与GPS的L1、L2双频数据对应结果存在平面上毫米级、高程上毫米至分米级的差异,应用于高精度工程测量网是行之有效的。

Aiming at the current stage of BeiDou system in BDS-3+BDS-2 hybrid service,this paper analyzes the data processing model of BDS network,and establishes a kind of high-precision engineering surveying network based on BDS-3+BDS-2 dual-frequency data for the application test.Four CORS stations that simultaneously support BDS-3+BDS-2 and GPS dual-frequency data are selected to lay high-precision engineering surveying network for data processing,and comparative analysis and evaluation are carried out in terms of the accuracy of phase observation values,standardized root-mean-square error after checking,quality of baseline vectors,repeatability of the baseline,and results of the net adjustment point coordinates.The experimental results show that:using the B1I and B3I dual-frequency data of BDS-3+BDS-2 to establish a high-precision engineering surveying network,the results of the obtained point coordinates are millimeter lever in horizontal direction and millimeter to decimeter level in vertical direction different from the corresponding results of the L1 and L2 dual-frequency data of GPS,which is effective to be applied to the high-precision engineering surveying network.