DGPS在广西沿海海底地形测绘中的应用

APPLICATION OF DGPS TO THE BATHYMETRIC SURVEY IN THE GUANGXI OFFSHORE AREA

DGPS（DifferentialGlobalPositioningSystem）测量技术即差分定位技术，包括实时差分和后处理差分定位技术，正在远海和近海测量中得到广泛应用。后处理差分定位与微波定位及GPS实时差分定位相比，具有作用距离远，不受基准台与船台之问的障碍物影响以及减少基准台等优点。对于近海大比例尺（大于1：1万）测量，可采用实时差分定位的方法，而小于1：1万中小比例尺海底地形图测绘及海上其他工程测量，采用后处理差分定位，既能满足精度要求，又能提高工作效率。本文主要介绍利用DGPS后处理定位方法，在测绘广西沿海1：5万海底地形图中的应用情况。

DGPS(Differential Global Positioning System) surveying technique in a differential positioning technique, and is applied widely in nearshore and off shore areas compared with the microwave positioning and the real-time DGPS positioning, the postprocessing differential positioning has three advantages, i. e., large operating range,not being affected by the obstructions between the reference and mobile stations, and reduction in number of reference stations. The real-time differential positioning can be used for the off shore large scale (>1: 10 000) surveys, but for the small scale (<1:10 000)bathymetric chart surveys and other off shore engineering surveys, it is better to use post-processing differential positioning technique to meet with the requirements for accuracy and to raise working efficiency. In this prper, the applications of DGPS postprocessing positioning technique to the bathymetric chart (1: 50 000 scale ) surveys in Guangxi offshore area are introduced.