For users who want high-accuracy
WAAS-corrected data without paying for an expensive
multiple-correction system. This system has a 5-Hz
update rate and WAAS correction capabilities. It
fits on the bridge of the Riverboat or Q-Boat. It’s
also a good choice for any high-accuracy inland
waters GPS application.
OS-GPS-DBS
The DBS system is for users who need differential
GPS accuracy but do not have access to Coast Guard,
WAAS, EGNOS, MSAS or other “free” correction
broadcast beacons. It consists of three components:
A dedicated base station that generates satellite
differential corrections. These corrections
are necessary because of position errors due
to atmospheric variations in travel time. A
base station located at a known position near
the remote will receive satellite data affected
by the same atmospheric conditions as the remote.
A “rover” or remote unit located
on your boat or other remote sensor platform.
The remote uses the corrections to adjust for
atmospheric conditions and provide a position
normalized by the base station’s known
position.
An RF link to transmit the corrections from
the dedicated base station to the boat. When
using our HydroLink transceivers, the same set
may be used to both transmit the corrections
from the base station and the sensor data from
the boat’s instruments.
The Oceanscience DBS system is much less expensive
than competing dedicated base station systems from
major manufacturers.
One concern when using a dedicated reference station
is the idea that the reference station must be surveyed
in. For river discharge measurements, the boat’s
position relative to the starting point is what’s
important. So relative, rather than absolute, accuracy
is needed. The absolute position of the base station
is not important, but it must not move during the
survey.
