The Hemsiphere S321+ GNSS Receiver
The Hemisphere S321+ has been Bench-Mark’s best-selling surveying receiver for the past three years. This is the best all around piece of equipment we have to offer here at Bench-Mark. This is the receiver that has all of the features of the highest end GNSS manufacturers at a price that is actually reasonable. There is no need to pilfer your coffers in order to pay for this unit. The S321+ is designed to quickly pay itself back, and is designed to last you for years to come. This is the network rover that will keep you ahead of the competition for years to come.
Multi Constellation GNSS and Triple Frequency
The S321+ is Hemisphere’s multi-GNSS, multi-frequency smart antenna. With the Hemisphere S321+ you receive corrections from; GPS, GLONASS, Galileo, BeiDou, and SBAS constellations at no extra charge. There is no need to activate the extra satellite constellations, they all come standard with the Hemisphere S321+. To add to this, the S321+ is also triple frequency. With a triple frequency receiver you have access to the most powerful GNSS signal yet L5. The L5 signal allows you to get performance otherwise impossible with traditional signals, in canopy positions. The L5 signal is powerful enough to get through tree canopies, allowing you to get shots that you would otherwise not have been able to get.
The S321+ provides robust performance and high precision in a compact and rugged package. With a surveyor tough aluminum body, the S321+ is built to withstand whatever conditions you throw at it. The S321+ is built to survive a 2 M pole drop. This is the receiver that is built with accidents in mind, and is built to survive them. The IP67 environmental rating means that Hemisphere’s S321+ can withstand whatever conditions you face on site. This is the receiver that is built to last for years to come, and has the technology to compete that long as well.
Athena RTK Engine
The S321+ receiver is powered by Athena RTK technology. With Athena, S321+ provides state-of-the-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. S321+ delivers centimeter-level accuracy with virtually instantaneous initialization times and cutting-edge robustness in challenging environments.
The S321+ also boasts the impressive SureFix technology. With SureFix, you can always be assured that the solution you are seeing is the true solution. While determining a a SureFix solution, the Hemisphere S321+ runs two solutions in parrellel on the board level. It is doing the equivalent of recording a fixed solution, and dumping the antenna to determine if the fixed position is consistent. You can be assured that a SureFix solution is correct 99.999 % of the time. This is the data you can rely on every time.
The S321+ receiver also enables users to work with Atlas. Atlas is Hemisphere’s industry-leading global correction service, which can be added as a subscription to the S321+. Atlas 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 near a GNSS or communication infrastructure.
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.
The S321+ features the ability to send and receive corrections over both cell and UHF modems. The powerful 1 W internal Satel radio is one of the best in the industry. With an optimal range of 10 km, you barely have the need for an external base radio. This is the receiver that has the radio power to get every survey done. In fact the S321+’s internal Satel radio is the best performing radio on Bench-Mark’s Range Test Baseline. Over 3.5 km with no line of site, the internal radio of the S321+ has no issues receiving corrections and calculating a fixed position. Once we step out of the truck, the receiver nearly instantly fixes. Every other receiver we have tested on this baseline, has had some range issues. This is the ultimate internal radio.
The internal 4G cell modem also allows you to send and receive corrections over cell. The S321+ is one of our favourite receivers to use on our own StormCaster internet RTK service. With StormCaster you can set up a permanent base at the office and as long as you have cell service, survey with unlimited range. With an internal cellular modem, you can run an an unlimited amount of rovers of the same base at multiple different job sites.
On top of the above mentioned communication options, the S321+ also broadcasts a Wifi signal over which setup and updates can be applied. With the Web-UI you can quickly set up static data, a base and a rover with little to no hassle. This is the receiver that has an option for any kind of way you want to work.
Key S321+ Features
- Multi-Frequency, Multi-GNSS Base Station/Rover
- GPS, GLONASS, BeiDou, Galileo, and QZSS
- Athena™ RTK, Atlas® L-Band, and SBAS-Capable
- Hot Swappable Batteries with 12 Hours of Combined Life
- Wifi, UHF, Cellular and Bluetooth Communication
- 8 GB of Internal Memory for Data Logging, Downloading, and Uploading
- 572 Channels
- 1, 2, 4, 5, or 10 Hz Update Rate (20 Hz Optional)
- Internal Radio (410 – 470 MHz)
Benoit B. –
The S321 is a great unit.
Peter Llewellyn – DGH Engineering Ltd. –
A great unit. Did even better near trees compared to other GNSS Equipment I’ve used in the past. I will definitely recommend it to others.
James Kenny – Pasquini & Associates Consulting –
Just an update, well Rene it’s the best built GPS I’ve ever used, I’m completely impressed with the design, the radio is way better now, and since the S321 firmware update it’s repeatability and accuracy has been dead on!
Also this Mesa2 works awesome in every aspect daylight, it’s viewability is like nothing else on the market and in wet conditions the screen works flawlessly.