A Robust Estimation Method for Correcting Dynamic Draft Error in PPK GPS Elevation Using ADCP Tilt Data

被引:9
|
作者
Matte, Pascal [1 ]
Secretan, Yves [1 ]
Morin, Jean [2 ]
机构
[1] Inst Natl Rech Sci, Quebec City, PQ G1K 9A9, Canada
[2] Environm Canada, Meteorol Serv Canada, Hydrol & Ecohydraul Sect, Quebec City, PQ, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Global positioning systems (GPS); Ship observations; Regression analysis; GLOBAL POSITIONING SYSTEM; HURRICANE KATRINA; WAVE HEIGHTS; SEA-LEVEL; TURBULENCE; BUOY;
D O I
10.1175/JTECH-D-13-00133.1
中图分类号
P75 [海洋工程];
学科分类号
0814 ; 081505 ; 0824 ; 082401 ;
摘要
Measuring temporal and spatial variations in water level with high resolution and accuracy can provide fundamental insights into the hydrodynamics of marine and riverine systems. Real-time kinematic global positioning systems (RTK GPS), and by extension postprocessed kinematic (PPK) positioning, have provided the opportunity to achieve this goal, by allowing fast and straightforward measurements with subdecimeter accuracy. However, boat-mounted GPS are subject to movements of the water surface (e.g., waves, long-period heaves) as well as to the effects of dynamic draft. The latter contaminate the records and need to be separated and removed from the data. A method is proposed to postcorrect the elevation data using tilt information measured by an attitude sensorin this case, an acoustic Doppler current profiler (ADCP) equipped with internal pitch and roll sensors. The technique uses iteratively reweighted least squares (IRLS) regressions to determine the position of the center of rotation (COR) of the boat that leads to optimal corrections. The COR is also allowed to change in time by performing the IRLS analyses on data subsamples, thus accounting for changes in weight distribution, for example, due to personnel movements. An example of application is presented using data collected in the Saint Lawrence fluvial estuary. The corrections exhibit significant reductions associated with the boat motion while keeping subtle variations in water levels likely related to local hydrodynamics.
引用
收藏
页码:729 / 738
页数:10
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