WinFrog User’s Guide - Appendix C – GPS/MX 9400
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Accuracy:
The Accuracy value entered provides WinFrog with the expected accuracy of the
position from this device. This value is used in the weighting of this device compared
to other positioning devices that may be added to the vehicle’s device list. The
smaller the value entered, the more accurate it is considered to be, and hence the
more weight that will be applied to the device’s data.
The Accuracy parameter can be changed from the suggested values; changes
should be made with caution, however, as they will affect the final filtered position of
the vehicle.
Code:
This entry window is used when the GPS data is being received by a remote GPS
receiver connected via telemetry link. If this is the case, set the Code to coincide
with the code parameters associated with the GPS unit being used.
For all other applications, the Code entry must be set to 0.
Offsets:
Offsets are required to associate the GPS antenna position with the vessel’s
Common Reference Point (i.e. CRP). The offsets are applied
from
CRP (of the
vehicle)
to
the GPS antenna location.
Forward Offsets are entered as positive values.
Aft Offsets are entered as negative values.
Starboard Offsets are entered as positive values.
Port Offsets are entered as negative values.
Height Offsets are positive upwards. (It is suggested that the vessel’s Height origin
should be at the water line.
Data item: GPS, MX9400, PSEUDORANGE
As mentioned above, both the Pseudorange device and the Ephemeris device must be
added to the vehicle’s device list. You must edit the Pseudorange device to suit the
vehicle. There is no configuration required for the Ephemeris device.
In the vehicle’s Devices list, highlight the GPS, MX9400, PSEUDORANGE device and
select the Edit button. The Pseudorange Calculation dialog box appears, as seen
below.
