S321+ Survey Smart Antenna

Hemisphere S321+ GNSS Smart Antenna

The S321+ multi-GNSS from Hemisphere GNSS is a multi-frequency smart antenna that provides high precision and robust performance in a rugged, compact package.



The S321+ GNSS smart antenna can be used in different operating modes, including as a base station sending RTK to an existing rover network, or as a lightweight rover by connecting it to a base with Wi-Fi or UHF radio. The receiver status and operation can be controlled and managed with the web user interface. The S321+ is also Atlas-capable and Athena-enabled.

Atlas, Hemisphere’s global correction service can be used by the S321+ receiver to deliver centimeter level world-wide correction data over L-band communication satellites.

By using Athena RTK technology, the S321+ provides state-of-art RTK performance when is receives corrections from a networked RTK correction system or static base station. The S321+ has multiple connectivity options enabling RTK corrections to be received via cell modem, radio, Bluetooth, Wi-Fi, or serial connection.


  • Atlas® L-band global corrections
  • Athena™ RTK engine
  • 12 hours of battery life with dual hot-swappable lithium batteries
  • Bluetooth, Cellular, UHF and Wi-Fi communication
  • 4 GB internal memory for data logging

Technical Specifications

Supply voltage:9 to 22V DC external power input with over- voltage protection (5-pin Lemo)
Dimensions:14.1 cm (D) x 14.0 cm (H)
5.5 inches (D) x 5.5 inches (H)
Weight:< 1.38 kg
< 3.05 lb
Operating temperature:-30 °C to 60 °C
-22 °F to 140 °F
IP rating:IP67. Protected from temporary immersion to a depth of 1 meter
Vibration:MIL-STD-810G, method 514.6E-I
Humidity:Up to 100%
Inflammability:UL recognized, 94HB Flame Class Rating (3).
GNSS Receiver
Receiver type:Multi-Frequency GNSS
Positioning modes:RTK, L-band, DGNSS, SBAS, Autonomous
RTK formats:RTCM3, ROX, CMR, CMR+
L-Band formats:Atlas H100, Atlas H30, Atlas H10
Update rate / Recording interval:Selectable from 1, 2, 4, 5, 10 Hz
(20 Hz available)


The S321+ from Hemipshere GNSS is available through Canal Geomatics. If you would like more information about this product, please feel free to get in touch with us by completing the Request Pricing form.