Case study of precision-of GPS differential correction strategies : Influence on aDcp velocity and discharge estimates
Case study of precision-of GPS differential correction strategies : Influence on aDcp velocity and discharge estimates
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DOI：
10.1061/(asce)0733-9429(2006)132:3(225
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发表时间：
2006-03
影响因子：
2.4
通讯作者：
C. Rennie;F. Rainville
中科院分区：
文献类型：
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作者：
C. Rennie;F. Rainville
以河流水流流速和流量测量为例，对四种全球定位系统(DGPS)的精度进行了评估。如果无法进行海底跟踪，则使用DGPS将声学多普勒海流剖面仪(ADCP)测得的水流速度分辨到地球坐标中。评估的DGPS系统是：(1)双频实时运动学(RTKL1L2)；(2)单频实时运动学(RTKL1)；(3)码相加拿大海岸警卫队(CG)；(4)码相广域增强系统(WAAS)。在加拿大加蒂诺河的一条断面上进行了重复流量测量(n=22)，同时收集了所有四个DGPS(VDGPS)的底轨船速(VBT)和船速(VDGPS)。VBT与VDGPS的平均单脉冲绝对差值分别为3.1(RTKL1L2)、3.2(RTKL1)、8.9(CG)和9.8 cm/S(WAAS)。在航道边缘附近观察到的误差更多，可能是由于河岸植被造成的阻塞和多径。
The precision of four differential global positioning systems (DGPS) was evaluated in the context of fluvial water velocity and discharge measurement. DGPS is used to resolve water velocities measured with an acoustic Doppler current profiler (aDcp) into earth coordinates if bottom tracking is unavailable. The DGPS systems assessed were: (1) the dual frequency real time kinematic (RTKL1L2); (2) the single frequency real time kinematic (RTKL1); (3) the code-phase Canadian Coast Guard (CG); and (4) the code-phase Wide Area Augmentation System (WAAS). Repeat discharge surveys (n=22) were conducted at a transect of the Gatineau River, Canada, simultaneously collecting bottom track boat velocity ( vBT ) and boat velocity from all four DGPS ( vDGPS ) . The mean absolute single ping differences between vBT and vDGPS were 3.1 (RTKL1L2), 3.2 (RTKL1), 8.9 (CG), and 9.8 cm∕s (WAAS). Errors were observed more often near channel margins, presumably due to obstruction and multipath associated with riverbank vegetation ...