Multi-constellation, dual-antenna GNSS receiver

  • Full-constellation, triple-frequency satellite tracking on both antennas
  • Sub-degree GNSS heading & pitch or heading & roll
  • Best-in-class centimeter-level RTK performance
  • AIM+ unique interference mitigation system as part of the advanced GNSS+ algorithm suite
  • Integrated UHF radio, cellular modem, Bluetooth and Wi-Fi (depending on configuration)

AsteRx-U3 is a multi-frequency, multi-constellation GNSS positioning and heading receiver, which includes a multitude of wired as well as wireless communications in a rugged IP68 housing, for the broadest range of applications.

Consistently accurate now and into the future

The AsteRx-U3 is the most advanced integrated multi-constellation dual-antenna receiver from Septentrio. Its multi-frequency engine can track signals from all Global Navigation Satellite System (GNSS) constellations: GPS, GLONASS, Galileo, BeiDou, NavIC and QZSS – on both antennas. This guarantees you reliable and accurate GNSS positioning now and into the future.

Reliable centimeter accuracy

Septentrio’s 20 years of experience in the GNSS industry ensures that the AsteRx-U3 offers the highest possible accuracy, down to the centimeter level. LOCK+ technology maintains tracking during heavy vibrations and IONO+ ensures position accuracy even during periods of elevated ionospheric activity. The AsteRx-U3 offers the very latest in advanced interference mitigation technology  AIM+, which filters out ambient intentional and unintentional RF interference.

Any device, any platform

Use any device with a web browser to operate the AsteRx-U3 without any special configuration software via the Web interface, accessible over Ethernet, Wi-Fi or USB connections.

AIM+ anti-jamming and RF spectrum monitoring system

AIM+ offers built-in protection against intentional and unintentional jamming using a sophisticated system of sampling and mitigation mechanisms. Your high-precision GNSS receiver can automatically suppress the widest variety of interferers from simple continuous narrow-band signals to the more complex wide band and pulsed transmitters as well as lnmarsat and Iridium satellite transmissions.  

Intuitive web user interface

With your high-precision GPS reference receiver comes an intuitive web user interface for easy operation and monitoring allowing you to control the receiver from any mobile device or computer. The web interface also uses easy-to-read quality indicators ideal to monitor the receiver operation during the job at hand.

Illustrative image for Septentrio AsteRx-U3 GNSS Receiver Web User Interface (WebUI)

GNSS technology

GPS: L1 C/A, L1C, L2C, L2 P(Y), L5
More info


Beidou: B1I, B1C, B2a, B2I, B2b, B3I
Galileo: E1, E5a, E5b, E5 AltBoc
QZSS: L1 C/A, L1C/B, L2C, L5
NavIC: L5
5 constellation RTK (base and rover)

Septentrio patented GNSS+ technologies

AIM+ Advanced Interference Monitoring and Mitigation
More info


Unique anti-interference system monitors, flags and mitigates narrow and wideband interference, jamming and spoofing.

More info


Hi-speed serial ports (RS232)
Ethernet port (TCP/IP, UDP, LAN 10/100 Mbps)
More info
xPPS output (max 100Hz)
Outputs to drive external LEDs
Event markers
General purpose output
NTRIP (client)
Initialisation time
7 s

Other positioning modes accuracy

Horizontal DGNSS
0.4 m
Vertical DGNSS
0.7 m

Time precision

xPPS out
More info

Incl. software compensation of sawtooth effect


Product datasheet

Support documentation

AsteRx-U3 User Manual v1.7
10.27 MB

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