SDCORS网高精度数据处理中的基准约束研究

Study on high-accuracy data processing of SDCORS network under different datum constraints

为客观研究主要的基准约束类型即自由网解算、约束参考站、固定参考站和最小约束解算对CORS网平差结果精度的影响,使用Bernese软件对2012年1月1日—2012年1月5日SDCORS的84个测站和5个IGS观测站的数据进行处理。结果表明:自由网解算的精度最低,最小约束解算的精度最高,在一定范围内,约束参考站的解算精度会随着给定的约束减小而变高。所以,测站点坐标应使用最小约束解算。

To studythe impact of main different datums on the precision of the SDCORS network solution,including the free network solution,constraining reference coordinates,fixing reference coordinates and minimum constraint solution.GPS data of 84 continuous operational reference system of Shandong（SDCORS）sites and 4 IGS stations for DOYs 1 to 5 in 2012 were processed using Bernese software.The results show that the free network solution makes the lowest precision and the minimum constraint solution has the highest precision in the SDCORS network adjustment.The given constraint gets smaller,the precision of constraining reference coordinates is better within a certain range.In conclusion,the datum of minimum constraint solution is proposed to process SDCORS GPS data.