精密多波束测量中GPS高程误差的综合修正法

Quality Control of GPS Height in Precise MBS Measurement

在精密多波束测量中,GPSRTK/PPK高程在提供瞬时垂直基准方面起着重要的作用。为获取高质量的换能器瞬时垂直基准,需对GPSRTK/PPK高程进行质量控制。为此,提出一种综合的质量控制方法,即利用Heave短时修正法、潮位联合吃水和Heave的长时间综合修正法,该法以融合后的记录来代替GPS高程中的异常记录,有效地消除了异常GPSRTK/PPK高程的影响,提高了多波束在垂直方向的最终成果精度。实践验证了该方法的正确性。

In precise multibeam measurement, GPS RTK/PPK height ploys an important role in providing instantaneous vertical datum. It is very necessary to implement quality control for GPS height in order to acquire a high quality instantaneous vertical datum of the transducer. Therefore, an integrated method, which is Heave modification for short-time abnormal GPS height records and the synthesis modification by blending tidal level, dynamic squat and Heave for the modification of long-time abnormal GPS height records, is given in the paper, This integrated method of quality control eliminates efficiently abnormal records and replaces abnormal records with blended records, which improves the final accuracy ofmultibeam results in vertical direction. Experiments proved it credible and accurate.