The goal this research is to investigate the use RTK heave as a - PowerPoint PPT Presentation

The goal this research is to investigate the use RTK heave as a replacement of MRU heave

Heave is a major contributor to errors in depth measurements.

Heave is a major contributor to errors in depth measurements.

In the past, manual or automatic smoothing of the data was the only practical way of partially correcting wave-induced errors.

The MRU accuracy in Heave is : +/- 5 cm

The RTK vertical accuracy: +/- 1 cm Rover Base

Why  Testing the new method of measuring heave  MRU heave may suffer from drift due to turn or acceleration

Remember  RTK may suffer from outage due to bad communication, could be overcome by PPK  sampling rate of MRU is higher than RTK

R2Snoic MBES project

R2Snoic MBES project: Three surveying lines Total length of 2 km Average depth: 15 m

area-based editing swath-based editing (Phase III) raw data (Phase II) review (Phase I) reading parameters applying correction s

Two ways of processing: Heave RTK Heave MRU Tide RTK Tide RTK

Two ways of processing: Heave MRU Tide RTK

Two ways of processing: Heave RTK Tide RTK

area-based editing swath-based (Phase III) editing (Phase II) raw data review (Phase I) Area based comparison reading parameters applying corrections Heave based comparison

H m and H r plot for the first survey line of R2Sonic project

H m and H r plot for the second survey line of R2Sonic project

H m and H r plot for the third survey line of R2Sonic project

H m and H r correlation for the first survey line of R2Sonic project

H m and H r correlation for the second survey line of R2Sonic project

H m and H r correlation for the third survey line of R2Sonic project

Standard Deviation between H m and H r for the three lines Line Standard Deviation (m) 1 0.02 2 0.03 3 0.02

area-based editing swath-based (Phase III) editing (Phase II) raw data review (Phase I) Area based comparison reading parameters applying corrections

Soundings profile for two surfaces S m and S r

0.006 and the standard deviation is 0.218

 there are high correlation between both Hm and Hr . In other words RTK heave could be used as a replacement of MRU heave

 Appling the same test on single beam echo sounder  Appling the same test in rough seas to see how the RTK heave will follow the MRU heave

Hydrographic Survey Research Group Dr. Mohamed Mohasseb Hassan Halwanee Mohamed Elmelegy Tamer Nada Ahmed Naguib Egyptian Navy. Dr.Ashraf Elasal Pat Sanders Prof. Dr. Saad Mesbah