河道测量差分信号中断补救措施探索和应用

Exploration and application of remedy measures for differential signal interrupt in river survey

为解决河道测量过程中因GNSS差分信号中断带来的不利影响,通过对GNSS单点定位精度、变化率的分析,采用单点定位后处理技术等方法对差分信号中断时采集的数据进行改正,并进行误差统计分析。结果表明:单点定位数据经后处理技术改正后,误差在相关规范容许范围内,数据成果满足质量要求,避免差分信号中断导致不必要返工影响结果质量的问题。GNSS单点定位后处理技术在河道测量中能够起到很好的补充作用,对河道及近海水下地形测量,特别是小比例尺水下地形测图具有很好的借鉴意义。

In order to solve the negative eff ects of GNSS diff erential signal interruption in river survey,the precision and rate of change of GNSS single point positioning are analyzed,the data collected during difference signal interruption is corrected by using the single point positioning post-processing technology,and the error is analyzed statistically.The results show that the error of single-point positioning data is acceptable after correction by postprocessing technology,and the data can meet the quality requirements,thus avoiding unnecessary rework caused by diff erential signal interruption aff ecting result quality.GNSS single point positioning post-processing technology can play a very good complementary role in river survey,which can also serve as a reference in river survey and off shore underwater topographic survey,especially in small scale underwater topographic survey.