Resetting the GNSS receiver
Trimble GNSS field applications all have options to reset the receiver to:
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delete the almanac
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delete information stored on the last known position
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restart the receiver
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reset the GNSS receiver to factory default settings
Ensuring the accuracy of your GNSS data
The Juno 5 series handheld has an integrated high-performance GNSS receiver that calculates accurate
GNSS positions. The accuracy that you obtain from the handheld is affected by a number of factors,
including whether the data is differentially corrected in real-time or after data collection, and the
availability of GNSS satellites in the sky when you collect the data.
To correct errors in the collected data and to further improve the accuracy of the GNSS positions, use
differential GNSS. Differential GNSS (DGNSS) requires one or more additional receivers, called base
stations or reference stations, which are located at known points. Data collected at the base stations is
used to determine GNSS measurement errors and compute corrections to these errors. These
corrections are then applied to data collected in the field either in real time or during postprocessing. For
more information, see Differential GNSS explained, page 64.
The list below identifies the most important settings and techniques that you can use in the field to
improve the accuracy of your data. This list assumes that you are using Trimble GNSS field software, and
lists items in order of most important to less important.
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If you are using the TerraSync software to collect data, use accuracy-based logging. For more
information, refer to the TerraSync software Getting Started Guide on
http://www.trimble.com/mappingGIS/TerraSync.aspx?dtID=technical_support.
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Use real-time differential corrections. If you have access to dual-frequency corrections from a VRS
network, use the corrections from the VRS network.
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Connect to an external antenna, if you have one.
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Plan GNSS data collection around the times of the day when satellite geometry is best.
Connecting to a real-time differential correction source
Use a real-time differential GNSS (DGNSS) source to give you better accuracy as you collect data. For more
information about how real-time differential GNSS works, see Differential GNSS explained, page 64.
Using real-time corrections from an Internet source
DGNSS corrections are often broadcast over the Internet. For example, corrections generated by a VRS
network are commonly broadcast over an Internet server. A VRS network uses data from several base
stations to provide rover receivers with corrections that are generally more accurate than corrections
from a single base station. Alternatively, you can connect to a server that provides DGNSS corrections
from a single base station.
The Juno 5 handheld supports RTCM 2.3 DGNSS correction data.
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