Page 5: of Marine Technology Magazine (May 2021)
Hydrographic Survey Sonar
The Next-generation INS/GNSS
Quality: Green -> centimetric position; Blue -> decimetric < 30cms; Red -> Raw GNSS data
SURVEYING UNDER BRIDGES Å GNSS Altitude (m) - Merged Å Altitude (m) - Merged
This survey has been done with an APOGEE INS under very challenging conditions for the GNSS receiver (red dots).
The boat is crossing multiple times three large bridges including one made of steel.
With Qinertia and its unique 100% in-house
GNSS/INS tightly coupled forward / backward processing, data collected under the bridges are
Altitude – Left GNSS only, Right: Post-processed fully exploitable (blue / green trajectory).
Long GNSS Outages Handling
The Fastest PPK Software Easy & Powerful Exporter outages and multi-path ef ects
Example: up to 80 seconds
Log duration: 2h15 Easy export to third party 95% positions < 2 cms
Processing Time: < 2 mins software (SBET/ ASCII)
Max error < 30 cms
Many thanks to Hydro Systems Development (HSD Japan) for their kind collaboration.
Full data available upon request at email@example.com www.sbg-systems.com
MTR #7 (1-17).indd 11 8/25/2020 11:49:40 AM