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S321 GNSS Survey Smart Antenna

Item# S321

This product has been replaced by the S321+ . Please see the S321+ under related products.
The S321 is Hemisphere GNSS's all-new multi-GNSS, multi-frequency smart antenna. It offers robust performance and high precision in a compact and rugged package. View Full Description

Category: Enclosures / Sensors
Manufacturer: Hemisphere GNSS
Hemisphere GNSS


S321 GNSS Survey Smart Antenna

The Hemisphere S321 has been replaced by the S 321 (Plus). Please see the S321+ (plus) under related product. 

The S321 is Hemisphere’s all-new multi-GNSS, multi-frequency smart antenna. It offers robust performance and high precision in 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.

  • Use the S321 as a precise base station sending RTK 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 web user interface can be used to control and manage the receiver status and operation, as well as to upgrade the S321 with new firmware and activations. S321 is Athena-enabled and Atlas- capable.

The receiver is powered by Hemisphere's Athena™ RTK (real-time kinematic) technology. With Athena, the S321 provides state-of-art RTK performance when receiving corrections from a static base station or network RTK correction system. With multiple connectivity options, the S321 allows for RTK corrections to be received over radio, cell modem, Wi-Fi, Bluetooth, or serial connection. The S321 delivers centimeter accuracy with virtually instantaneous initialization times and cutting edge robustness in challenging environments.


  • Athena RTK engine
  • GPS, GLONASS, BeiDou, Galileo, QZSS
  • 372 channels
  • Atlas corrections delivered via L-band and over the Internet
  • Wireless connectivity via Bluetooth and Wi-Fi
  • Powerful web UI
  • Two versions (Each can be configures as a Base or Rover):
    •     UHF GSM/WCDMA
    •     GSM/WCDMA (Network Rover)
  • 4 GB internal memory card and 64 GB-capable MicroSD card for data logging, download and upload

This receiver also enables users to work with the Atlas™ service. Atlas is Hemisphere’s industry leading global correction service, which can be added as a subscription to the S321. The Atlas system delivers world-wide centimeter-level correction data over L-band communication satellites and over internet. With Atlas, S321 users are able to experience sub-decimeter positioning performance anywhere on earth, without the need to be nearby a GNSS or communication infrastructure.

The Atlas L-band has the following benefits:

  • Positioning accuracy - Competitive positioning accuracies down to 2 cm RMS in certain applications

  • Positioning sustainability - Advanced position quality maintenance in the absence of correction signals, using Hemisphere’s patented technology