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operator must be aware of what is available on the Remote and configure the data
item accordingly.
Note: This option is not available in the WinFrog Remote package.
Antenna Height:
Set the Antenna Height using the radio buttons and the (input) Ellipsoid Height field.
Settings are as follows:
Calculated – Select this option to force WinFrog to calculate the GPS antenna
Height, as well as its Latitude and Longitude. In this mode, WinFrog requires a
minimum of four satellites to be visible.
Fixed – Select this option to fix the GPS antenna ellipsoid height to the value
entered in the Ellipsoid Height field. In this mode, WinFrog is able to calculate
valid positions using a minimum of three satellites.
Auto\Last Height – If this mode is selected, WinFrog will calculate a 3D position
if four or more satellites are available. If only three satellites are visible, or if the
VDOP of the solution exceeds the value set in the Alarms dialog box, the height
is fixed to that of the last valid position. In this mode WinFrog is able to calculate
valid positions using a minimum of three satellites.
Auto\Input Height – If this mode is selected, WinFrog will calculate a valid 3D
position if four or more satellites are available. If only three satellites are
available, or if the VDOP of the solution exceeds the value set in the Alarms
dialog box, the height is fixed to the value entered in the Ellipsoid Height field.
In this mode, WinFrog is able to calculate valid positions using a minimum of
three satellites.
Note: The Antenna height entered in the Pseudorange Calculation dialog box
refers to the WGS 84 Ellipsoid.
Offsets:
Offsets are entered to relate the GPS antenna position to the vessel's Common
Reference Point (CRP). Offsets are entered as measured from the CRP (of the
vehicle) to the device (antenna) location. Offsets Fore and Starboard are entered as
positive values, offsets measured Port and Aft are entered as negative values. Rule
of thumb suggests the CRP "Z" reference should be at the water line.
DGPS Mode:
Select the desired mode of DGPS operation
There are four different DGPS modes: Auto, On, Off and Generate.
Auto: WinFrog will automatically use differential corrections in its position
calculations, when available. If no corrections are available, WinFrog will
compute a single point (autonomous) position solution.
WinFrog User's Guide - Appendix C – GPS/NovAtel Con
Page 11 of 22
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