Date: April 16, 2019
Location: A River Section Near Youyi Bridge in Xiangyang City, Wuhan
Facility: SL20 Autonomous Survey USV
River condition: Relatively strong wind, waves over 10cm high, with ships passing by.
Mission: Utilize the SL20 USV to survey the underwater topography and section of this river sector systematically to generate a three-dimensional coordinate system for later mapping processing
The survey area is 150m away from Youyi bridge. In this areathe river is of 200 to 300 meter wide, water depth is majorly between 3 to 12 meter, the flow velocity is about 0.8m/s. This section is a navigable section with vessels constantly passing by. The survey area is shown below:
Pic 1-1 Maps of the survey area
The SL20 Autonomous Survey USV
The SL20 Autonomous Survey USV is a new generation of survey vessel integrating navigation system, GNSS Global Positioning System and highly accurate bathymetric surveying system. It has the following advantages compared with a tradition survey boat:
Problems can be solved by the unmanned boat surveying system:
Mobile Station: Southern Galaxy 1
Base Station: Southern Galaxy 6
Southern Freedom software, dedicated for unmanned boat operation, integrates functions including USV navigation, data collecting, storing and post-processing.
Pic 6-1 Autonomous survey lines of the USV
Pic 6-2 Southern Cass data (.dat format)
Pic 6-3 Custom data output
Section data output
Pic 6-4 Crosspoint data comparison
Pic 6-5 Section 1
Pic 6-6 Section 2
Pic 6-7 Section 3
The SL20 Autonomous Survey USV complied its mission successfully in this task. It’s proved that the USV is easy to be transported, set up and operated. It can be applied to underwater topography survey and provide basic data support for river management, regulation, and silt cleaning.