940-2181-10 Hemisphere 10466.00  

Hemisphere S321+ Smart Antenna (940-2181-10)

Hemisphere Part Number: 940-2181-10

Hemisphere S321+ Smart Antenna
(Save $33.00 off RRP!)


S321+ GNSS Smart Antenna

The S321+ is Hemisphere's all-new multi-GNSS, multi-frequency, smart antenna. The S321+ provides robust performance and high precision in a compact and rugged package. With multiple wireless communication 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 RTK1 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 (web UI) 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 S321+ receiver is powered by the Athena RTK1 technology. With Athena, S321+ provides state-of-art RTK1 performance when receiving corrections from a static base station or network RTK1 correction system. With multiple connectivity options, the S321+ allows for RTK1 corrections to be received over radio, cell modem, Wi-Fi, Bluetooth, or serial connection. S321+ delivers centimeter-level accuracy with virtually instantaneous initialization times and cutting edge robustness in challenging environments.

The S321+ Smart Antenna comes by default with single frequency GPS only. The following services are available for purchase as software unlocks:

  • Atlas Subscription
  • Multi Frequency/RTK1
  • Multi GNSS
  • 20Hz

The S321+ 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. 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.

Atlas L-band has the following benefits:

  • Athena™ RTK1 engine and Atlas® L-band global corrections
  • Dual hot-swappable lithium batteries provides 12 hours of battery life (must replace within 20 seconds)
  • Wi-Fi, UHF, Cellular, and Bluetooth communication ports
  • Multi-Frequency, Multi-GNSS (GPS, GLONASS, BeiDou, Galileo, QZSS)
  • 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.

Please note:

1 Software unlock require for RTK.


GNSS Receiver

Receiver Type Multi-frequency GNSS
Positioning Modes RTK1, L-band, DGNSS, SBAS, Autonomous
Channels 394
RTK1 Formats Atlas H100, Atlas H30, Atlas H10
Update Rate/Recording Interval Selectable from 1, 2, 4, 5, 10 Hz (20 Hz available)

Satellite Tracking

GPS L1CA, L1P, L2P, L2C, L5
GLONASS G1, G2, P1, P2
BeiDou B1, B2
Galileo E1BC, E5a, E5b


  • Horizontal: 8mm + 1ppm
  • Vertical: 15mm + 1ppm
Static Performance (long occupation)
  • Horizontal: 3mm + 0.1ppm
  • Vertical: 3.5mm + 0.4ppm
Static Performance (rapid occupation)
  • Horizontal: 3mm + 0.5ppm
  • Vertical: 5mm + 0.5ppm
L-Band Performance
  • Horizontal: 0.08m
  • Vertical: 0.16m
  • Horizontal: 0.3m
  • Vertical: 0.6m
  • Horizontal: 1.2m
  • Vertical: 2.4m


Connectors I/O
  • 5-pin Lemo connector for external power supply, Serial communication, and external radio devices
  • 7-pin Lemo connector for USB OTG connection and troubleshooting
  • 1 SMA antenna connector for internal radio
  • 1 SMA antenna connector for modem module
WebUI To upgrade the software, manage the status and settings, data download, via smart phone, tablet or other electronic device, configure advanced radio settings
  • Smart voice broadcast system.
  • "Speaking" receiver
Reference Outputs
  • RTCM2.1
  • RTCM2.3
  • RTCM3.0
  • RTCM3.1
  • RTCM3.2 including MSM


Frequency Range 410 - 470 MHz
Channel Spacing 12.5KH / 25 KHz
Emitting Power 0.5 /1W
Operating Range 3 - 5 km typical/10 km optimal (Depends on terrain and operating environment)

Wireless Module

Wi-Fi Integrated module with internal Wi-Fi antenna
Bluetooth Bluetooth 2.1 + EDR Integrated Bluetooth (BT) communication module with internal BT antenna


PLS8-E (International)
  • 4G - Penta Band LTE - 800/900/1800/2100/2600 MHz - FDD-Band (20, 8, 3, 7, 1)
  • 3G - Tri Band UMTS (WCDMA) - 900/1800/2100 MHz - FDD-Band (8, 3, 1)
  • 2G - Dual Band GSM/GPRS/EDGE - 900/1800 MHz


Battery Hot-swappable 11.1 V - 37.74 Wh intelligent lithium (2 per kit)
Battery Life 12 hour operation from two batteries with UHF radio in Rx mode
Voltage 9 to 22V DC external power input with overvoltage protection (5-pin Lemo)
Charge Time Typically 7 hours


SIM Card User accessible SIM card slot
Memory Internal 8GB, accessible through USB and Wi-Fi
SD Card External Micro SD card slot, supports up to 64 GB.


Operating Temperature -30°C to 60°C (-22°F to 140°F)
Storage Temperature -40°C to 80°C (-40°F to 176°F)
Waterproof/Dustproof IP67. Protected from temporary immersion to a depth of 1 meter
Shock Resistance
  • MIL-STD-810G, method 516.6
  • Designed to survive a 2 m pole drop on concrete floor with no damage
  • Designed to survive a 1 m free drop on hardwood floor with no damage
Vibration MIL-STD-810G, method 514.6E-I
Humidity Up to 100%
Inflammability UL recognized, 94HB Flame Class Rating (3). 1.49mm
Chemical Resistance Cleaning agents, soapy water, industrial alcohol, water vapor, solar radiation (UV)


Size 14.1 D x 14.0 H (cm) / 5.5 D x 5.5 H (in)
Weight <1.38 kgs (<3.05 lbs)
Mounting 5/8"x11, 55° thread angle, stainless steel insert
Phase Center Offset GPS L1 and L2 offset below 2.5mm

Included in the Box:

  • S321+ Network Smart Antenna
  • Smart Battery x 2
  • Battery Charger x 1
  • Battery Charger Adapter x 1
  • Serial cable for PC or controller
  • RAW data activation
  • User Guide
  • Communications Guide
  • GSM/WCDMA External Antenna
  • Tape Measure
  • Carry Case
  • 4GB SD Card

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