基于PPK无验潮的水下地形测量技术研究

Research of Bathymetric Survey Technique based on PPK without Tidal Observation

随着载波相位差分技术的发展,RTK(Real Time Kinematic)三维水深测量已经广泛应用于水下地形测量中。RTK技术需要建立实时数据链接传输差分数据,当数据链接丢失时,定位精度会严重下降。针对此问题,本文研究了一种基于后处理动态差分无需实时数据链接的PPK(Post Processing Kinematic)定位技术,并通过静态和动态比测的方法,对不同GNSS系统及其组合解算策略进行了精度和稳定性测试,最后在杭州湾河口进行了实际应用。测试结果表明,PPK获取的结果具有良好的稳定性,定位精度能满足实际工作需要;实际应用结果表明基于PPK的无验潮水下地形测量技术具有广泛的应用前景。

With the development of carrier phase differential technique, RTK 3D bathymetric survey has been widely used in underwater topographic survey. RTK technology needs to establish a real-time data link to transfer differential data, when the data link is lost, the positioning accuracy will be seriously reduced. In order to solve this problem, a PPK positioning technology based on post processing dynamic difference without real-time data link has been studied, and the precision and stability of different GNSS systems and their combined solution strategies are tested by static and dynamic comparison methods, finally the actual application is carried out in Hangzhou Bay. The test results show that the results obtained by PPK have good stability and the positioning accuracy can meet the needs of actual work;the practical application results show that the bathymetric survey technology based on PPK without tidal observation has a wide application prospect.