Vector Sensor Reference Manual 141
Both beacon and SBAS services use base stations to calculate GPS correction data. Beacons use a
single, local base station for corrections, while SBAS services use a wide area network of stations.
If there is a significant distance to the closest beacon (greater than a 200 - 300 hundred miles), this
will have an effect on positioning accuracy due to differing environmental conditions between the
remote receiver and base station (spatial decorrelation). In such a case, if the accuracy degradation
is not tolerable, SBAS should be considered. However, if you are operating at distances
significantly away from the SBAS network, the same issue of spatial decorrelation can occur.
Beacon signals are more susceptible to radio frequency interference than SBAS signals, however
the state of CSI Wireless beacon technology has progressed such that beacon systems provide
very good immunity to environmental noise. If RF noise presents a continuing problem with your
installation, you should first try relocating the MBL-3 beacon antenna. If this doesn’t solve the
problem, consider using SBAS.
Both SBAS and beacon services are free, so it’s possible to use both for a period of time, to
determine which satisfies your needs best. Once this has been determined, it’s a good idea to
continue using one of the two services from then on, and not switch from between the services
frequently. This will help to ensure consistent positioning from day to day. For information
relating to locations of DGPS beacons, please consult our company web site at:
www.csi-wireless.com
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