Multi-frequency dual antenna GNSS receiver

  • 544 channels for tracking all known and future GNSS signals from GPS, GLONASS, Galileo, BeiDou, IRNSS, QZSS & SBAS on both antennas
  • Precise and robust heading calculation
  • Cm-level (RTK) and dm-level (PPP) position accuracy
  • Dual L-band channel, support PPP Marinestar corrections
  • Septentrio's advanced GNSS+ algorithms for robust industrial performance
  • Unique interference mitigation capabilities: 3 notch filters and chirp jammer mitigation
  • Easy to integrate, fully documented interface language
  • Comprehensive, on board web interface 
  • Low & scalable power consumption


The AsteRx4 is the most advanced multi-constellation dual antenna receiver from Septentrio. Its triple frequency engine can track all Global Navigation Satellite System (GNSS) constellations - GPS, GLONASS, Galileo, BeiDou, NavIC, and QZSS – on both antennas. It supports current and future signals as they become available – guaranteeing you reliable and accurate GNSS positioning into the future. For offshore applications please see AsteRx4 MARINE FG.

The GNSS+ toolkit - converting bad environments into good positioning

Activity in the ionosphere is a problem for GNSS signals, from loss of RTK fix to total loss of signal lock. Having honed our skills, supporting applications in the most iono-active areas on Earth,  the result is IONO+: the most advanced protection against ionospheric disturbances to GNSS signals on any receiver.

Metal and large nearby structures can reflect GNSS signals and produce multipath. The APME+ system effectively disentangles direct and reflected signals enhancing both position and measurement quality. APME+ is bias free and, in line with Septentrio’s commitment to maximum configurability, can be disabled.

Advanced Receiver Autonomous Integrity Monitoring (RAIM+comprises fault detection mechanisms of the receiver at all the levels including the generation of measurements, quality control and navigation algorithms. Detected faulty measurements, which are typically caused by high multipath or active ionosphere, are removed from the solution.

Mechanical vibrations or shocks caused by rough terrain can wreak havoc with satellite tracking. LOCK+ automatically adjusts the parameters of the AsteRx4 high-precision GNSS receiver so you never lose position.

AIM+ anti-jamming and RF spectrum monitoring system

All Septentrio high-precision GPS/GNSS receivers feature AIM+, the most advanced onboard  radio frequency interference (RFI) monitoring and mitigation technology on the market. It can suppress the widest variety of interferers, from simple continuous narrowband signals to the most complex wideband and pulsed jammers. The built-in protection against intentional and unintentional jamming and spoofing uses a sophisticated system of sampling and mitigation mechanisms. The RF spectrum can be viewed in real-time in both time and frequency domains.

Intuitive web user interface

AsteRx4 GPS/GNSS OEM receiver comes with fully documented interfaces, commands and data messages. The included GNSS receiver control and analysis software RxTools allows receiver configuration, monitoring as well as data logging and analysis. 

The receiver includes 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 AsteRx4 GNSS Receiver Web User Interface (WebUI)


This version of AsteRx4 is designed specifically for marine applications. It provides reliable high-accuracy positioning at sea with the Fugro Marinestar GNSS service (service subscription is required). Its exceptionally robust GNSS tracking, anti-shock LOCK+ technology and dual antenna support make AsteRx4 MARINE FG ideal for offshore construction or marine survey.





Septentrio’s 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
Integrated dual-channel L-band receiver
Heading GNSS attitude
More info

Optional feature


Hi-speed serial ports (RS232)
Ethernet port (TCP/IP, UDP, LAN 10/100 Mbps)
High-speed/full-speed USB device port
Event markers
More info

Depending on configuration.

xPPS output (max. 100 Hz)

Integrated position accuracy

Standalone - horizontal
More info

Open-sky conditions. RMS levels.

1.2 m
Standalone - vertical
More info

Open-sky conditions. RMS levels.

1.9 m
SBAS - horizontal
More info

Open-sky conditions. RMS levels.

0.6 m
SBAS - vertical
More info

Open-sky conditions. RMS levels.

0.8 m


Horizontal accuracy
More info

+ 0.5 ppm

0.6 cm
Vertical accuracy
More info

+ 1 ppm

1 cm


Velocity accuracy
More info

Open sky conditions. RMS levels.

3 cm/s

Product datasheets

Support documentation

Important note - Firmware upgrade:

This firmware version does not support Septentrio SECORX positioning based on TerraStar service. Receivers actively using the SECORX service need to remain at a lower firmware version.

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