Ag Leader Base Station Hardware Manual - Manual (Page 7)

Hardware Installation Manual 5
Accurate Latitude and Longitude Positions
advantage of this method is that it provides a large RTK coverage area without the need to move the Base Station
components once they have been installed.
Accurate Latitude and Longitude Positions
Mapping functions of the User Display and/or 3rd party software for boundary creation or variable rate applications require an
accurate latitude and longitude position for the vehicle. The latitude and longitude of the vehicle is calculated by its relative
distance to the latitude and longitude of the Base Station GPS Antenna. Therefore, the accuracy of the latitude and longitude of
the vehicle is entirely dependant on the accuracy of the latitude and longitude the Base Station. Accurate Base Station position
is accomplished by either “surveying in” or by manually entering a known position as discussed in the following sections.
Note: If accurate vehicle latitude and longitude is not needed, an RTK system still provides sub-inch accurate positioning.
Additionally, repeatability is independent of accurate latitude and longitude. In other words, even without an accurate
latitude and longitude, the vehicle will still be able to steer with sub-inch accuracy and repeat saved jobs.
Base Station Surveying for Accurate Latitude and Longitude
Note: If a job does not require an accurate latitude and longitude for example, to use with 3rd party software for mapping
and variable rate applications, it is not necessary to take the time to let the Base Station survey in.
The Base Station is designed to automatically survey its position over a continuous 24 hour period to an accuracy of 4 inches
(10 cm). Once the Base Station is powered on, it will begin to average its position. After it has been running for at least 24
hours, the system will calculate its position and store it for future use. If the Base Station antenna is moved to another position,
the survey process starts over and the new position will be saved. The Base Station can store up to 16 different locations. When
the Base Station is powered up, it will first check to see if it is near any of the stored locations in its memory. If it is, it will
automatically use that stored location as the latitude and longitude it uses to calculate the vehicle's latitude and longitude.
Initial Survey Procedure
Follow this procedure when setting up a new job (at a new location) that requires accurate vehicle latitude and longitude.
1. Choose a location and mount the Base Station according to the guidelines in Repeatability on page 4 and Maximizing
Positioning Performance on page 7. Also, see the appropriate chapter for your Base Station configuration for detailed
hardware setup instructions.
2. Power ON the Base Station, and plan to leave it on for at least 24 hours.
3. Inspect the faceplate LEDs. See the appropriate chapter for your Base Station configuration for additional information on
the LEDs.
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The PWR LED should be on steady, indicating constant power supply.
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The ST LED will flash indicating the channel number of the Base Station (should be last 3 digits of the serial number).
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Once the Base Station begins to receive satellite signals, the NSV LED will blink once per satellite received separated by
a short pause between groups.
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Once sufficient satellite data has been received to begin position averaging, the ST LED will begin to blink once per
second.