摘要
基线向量是将全球导航卫星系统(GNSS)接收机采集的观测数据用随机软件、商用软件或者专用软件计算出来的接收机之间的三维坐标差,基线向量是相对定位的结果,他是控制网平差的观测量,基线向量的质量影响着控制网的平差结果,控制网在无约束平差以及约束平差前应对基线向量进行质量检验,检验的目的是为了剔除粗差以及基线解超限的基线,通过对某C级网的计算发现,不进行基线检核的约束平差结果反而比进行基线检核的约束平差结果得到更高的点位精度,通过对点位中误差计算过程的分析,可以得出随着多余观测量的增加,在不进行基线检核的情况下反而会得到虚高的点位中误差,GNSS控制网的点位中误差并不能完全真实反映控制网的精度,而单位权中误差的大小更能反映网的精度,因此GNSS控制网在无约束以及约束平差前进行基线检核很有必要.
Abstract
The baseline vector is calculated by using the observation data collected by global navigation satellite system(GNSS)receiver with random software or commercial and special software.The three-dimensional coordinate difference between the receivers,baseline vector is the result of relative positioning,it is the observation of control network adjustment,and the quality of baseline vector affects the adjustment result of control network.The control network should check the quality of baseline vector before unconstrained and constrained adjustment.The purpose of the inspection is to eliminate gross errors and baselines whose baseline solutions are out of limit.Through the calculation of a C-level network,it was found that the result of constrained adjustment without baseline check was higher than that of constrained adjustment with baseline check.Through the analysis of the calculation process of point-to-point error,it could be concluded that with the increase of baseline vector,virtual high point-to-point error will sometimes be obtained without baseline check.The point error of GNSS control network can not fully reflect the accuracy of the network,but the error in unit weight can better reflect the accuracy check of the network.It is necessary to check the baseline of GNSS control network before unconstrained and constrained adjustment.
国家科技期刊平台
NSTL
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