Baseline solution is the key step of static GPS surveying. The precision analysis of baseline solution result under every condition is benefit to improving GPS survey precision.
This paper describes three positioning modes of towing equipment in marine survey, the board-hanging mode, LAYBACK mode and ultra-short baseline mode.
介绍了海洋调查中测量设备拖曳体（拖鱼）的三种定位方法：舷挂式、LAYBACK方式和超短基线方式；
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The discussions are made in this paper on implement of repetition survey and the comparison of corresponding baselines with original baseline in the data processing.