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《Progress In Geophysics》 2005-04
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GPS data problems and its processing in marine geophysical survey

LUAN Xi-wu,LU Yin-tao,XU Tao (Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China)  
A large part of error of marine geophysical data is from GPS data.GPS data processing is important for improving the accuracy of acquired marine geophysical data.In this paper we show examples of GPS data sections containing wild value,zero value,and repeating value.Examples of logging time hiatus and track hiatus found in our GPS record were also given in this paper.We also detail the methods how to deal those kinds of bad data sections.The paper pointed out that for guarantying the safe marine geophysical measurement,a spare GPS receiver is needed during the cruise.But when two GPS receivers were used at the same time during the marine geophysical data acquiring,no matter what kinds of receiver were used,a time difference between the two receivers will always be there.And for a long time purposely arranged observation,we found no regular pattern or rule for this kind of time difference.A brief discussion for the causes of the above GPS data problems was given in the last part of this paper.We believe that bad weather,unsuitable satellites distribution,antenna moving status,receiver working stability,speed of decode mould,multi-route effects could be the reasons of causes of bad GPS data,but we still not sure which reason is corresponding for which kind of bad GPS data section.
【Fund】: 中国科学院海洋研究所知识创新领域前沿项目
【CateGory Index】: P714.8
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