Spectra Precision FAST Survey Reference Manual - Manual (Page 86)

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The RTK tab is used to configure the GPS RTK communications.
 Device:
This list contains the supported devices that deliver or receive RTK messages, such as a radio or IP
modem. If an External Radio is selected, the user will need to specify the Port, Baud, Parity and Stop Bits that the
radio manufacturer requires. For internal radios, FAST Survey will detect the proper settings.
 Network:
This list allows you to configure and connect to various networks (e.g. NTRIP).
 Message Type:
You must select the RTK message type that you wish to broadcast and receive. This is the format
of the RTK message that is either sent from the base and received by the rover.
 Base ID:
This is typically used to isolate paired devices. The user specifies that the base is "ID 1", then the rover
should be set to only listen for "ID 1" so that other base stations that might be in the area do not interfere.
 Send Rover Position to Network:
This will output a NMEA GGA message for networks that require it.
Manufacturer Setup Instructions
For manufacturer specific information, please consult with the Instrument Setup by Manufacturer section.
GPS Base
For GPS equipment, it is necessary to set up the base antenna and record the correct antenna height, the antenna type
(for certain equipment), and the methods used for localizing (obtaining the desired coordinates).
Much of GPS Base is common to most instruments. For example, the Base Ant. Height would be entered in feet or
meters, depending on the setting specified in Units within Job Settings. Vertical or Slant height refers to the method
used to measure the height of the base antenna. Vertical refers to the distance from the ground point to the antenna disk,
measured plumb. Slant refers to the distance from the edge of the antenna disk down to the ground point directly
beneath the center of the antenna. Elevation Mask refers to the degrees above the horizon above which satellites will be
used for GPS “correction” calculations, and below which satellites will be ignored. Keep in mind that it is not always
better to lower the elevation mask below 10 or 15 degrees. Satellites closer to the horizon than 10 degrees will often
degrade the calculation of coordinates.
The “alternative” to GPS Base is GPS Rover. GPS receivers can usually function as either type, but must be
“configured” for the role they will serve. You will be warned when you switch receiver configuration from Base to
Rover and vice versa, to confirm that is what is intended.
With all RTK GPS Equipment selections (except GPS Simulation), GPS Base will first bring up settings and then
proceed to the 6-option GPS Base screen which “locates” the base position.
After completing the GPS communications setup and clicking on the Ok button the Base Configure dialog will be
presented. These button options "locates" the base position. The 6-button GPS Base options (3 buttons per “tab”),
common to all, are discussed first, followed by equipment-specific settings.