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Septentrio AsteRx-U3 GNSS & Heading Receiver

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



The 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.

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.

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.

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+ 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.

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.


  • 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)

Technical Specifications

GNSS Signals
GPS: L1 C/A, L1C1, L2C, L2 P(Y), L5
GLONASS: L1 C/A, L2 C/A, L3, L2P
Beidou: B1I, B1C, B2a, B2I, B3I
Galileo: E1, E5a, E5b, E5 AltBOC
QZSS: L1 C/A, L1C, L2C, L5
NavIC: L5
Size: 157 x 245 x 45 mm
Weight: 1.5 kg
Input Voltage: 9-48 VDC
Power Consumption: 8 W maximum
Operating Temperature: -30°C to +65°C, -22°F to +149°F
Storage Temperature: -40°C to +75°C, -40°F to +167°F
Humidity: IEC60721-3-5, Class 5K2
Dust: MIL-STD-810H, Method 510.7, Procedure I
Shock: MIL-STD-810H, Method 516.8, Procedure I/II
Vibration: MIL-STD-810H, Method 514.8, Procedure I
Corrosion: IEC60068-2-52, Method 2


The AsteRx-U3 GNSS and heading receiver from Septentrio is available through TerrisGPS. If you would like more information about this receiver, please contact us using the Request Pricing form.

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Client Testimonials

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"Thank you for your prompt service. All seems to be working well again. Your techs were very helpful with the troubleshooting."
J.O. - Ground Navigation
"Thanks for all the troubleshooting help, also to John for his assistance and the prompt answers from you guys!"
F.A. - Survey Industry

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