Hemisphere GPS S321 Non-UHF, User Manual

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S321 User Guide Chapter 1 - Introduction
Page 2 of 65
Introduction
This User Guide provides information to help you quickly set up your S321 Smart Antenna.
Product Overview
The S321 is an all
‐ new multi ‐ GNSS, multi ‐ frequency smart antenna designed by and for
surveyors. The S321 delivers robust performance and high precision in the field with a compact
and rugged package.
With multiple wireless communications ports and an open GNSS interface, the S321 can be used
in a variety of operating modes in a network or crew. Use the S321 as a precise base station
sending RTK or Atlas L
‐ band corrections to your existing rover network.
Turn S321 into a lightweight and easy to use rover by connecting it to your base via UHF radio or
Wi
‐ Fi network. The built ‐ in WebUI is used to control, manage, and upgrade the S321 with new
firmware and activations. S321 is Athena enabled and Atlas capable.
Athena RTK
Athena RTK (Real Time Kinematic) technology is available on Eclipse
‐
based GNSS receivers.
Athena RTK requires the use of two separate receivers: a stationary base station (primary
receiver) that broadcasts corrections over a wireless link to the rover (secondary receiver). The
localized corrections are processed on the rover to achieve superior accuracy and repeatability.
Performance testing has shown positioning accuracy at the centimeter level.
Athena RTK has the following benefits:

Improved Initialization time
‐
Performing initializations in less than15 seconds at better
than 99.9% of the time

Robustness in difficult operating environments
‐
Extremely high productivity under the
most aggressive of geographic and landscape-oriented environments

Performance on long baselines ‐ Industry ‐ leading position stability for long baseline
applications
Note: Throughout the rest of this User Guide the S321 Smart Antenna is referred to
simply as the S321.