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Datawell - Model MOSE-G1000 -GPS Based Motion Sensor
The MOSE-G1000 measures its three-dimensional motion in 3 frequency regimes where each regime has its own precision. Centimetre precision is achieved in the high frequency regime (1-100 s periods). Here the MOSE-G1000 works just like the Datawell DWR-G directional wave buoys. For very low frequencies the GPS position is output every 10 seconds with a precision of several meters. In addition to these high and very low frequency regimes the MOSE-G1000 covers the low frequency regime (10-1000 s periods) in between. In this regime the precision amounts to several centimetres depending on the filter selected.
As the measurement noise increases with longer periods, 3 filters with cut-off periods of 300, 600 or 1000 s have been implemented. The correct choice of filter will minimize the noise while preserving the motion periods of interest. To eliminate unwanted motion on the short period side 2 filters with a 10 or 30 s cut-off period are available. These latter 2 filters have no effect on the noise.
All data are output through one RS232 port. The MOSE-G1000 is NMEA compliant. Human readable NMEA proprietary messages are output. A single cable carrying power and signal lines enters the unit. The unit has a base plate with 4 holes for mounting. Since GPS refers directly to the WGS84 reference frame no special alignment is required.