Understanding Communication Interfaces in RTK GNSS Receivers

In modern surveying and mapping, RTK GNSS receivers are indispensable tools. The communication system  on the motherboard determines the device's adaptability in various working scenarios, from surveying and mapping to agriculture and construction. These receivers are often equipped with multiple communication options to ensure connectivity.

In this blog,I will introduce these common communication interfaces and their functions one by one.

1.UHF Radio

In the RTK GNSS field, UHF typically refers to a digital radio, whether built into or connected to the device.

Function：In remote mountainous areas or border regions without network coverage, UHF (Ultra-High Frequency) radio is the core method for transmitting differential data between RTK base stations and rover stations.

2.4G/SIM

4G/SIM refers to the fourth-generation mobile communication technology module built into the RTK receiver.

Function：The equipment integrates a 4G module, enabling the RTK receiver to establish a connection with the CORS station server via the Internet, achieving bidirectional real-time transmission of correction data, and significantly improving the equipment's operational efficiency and positioning accuracy in wide-area surveying and mapping and mobile operation scenarios.

3.Wifi

It allows electronic devices (such as mobile phones, computers, and RTK receivers) to access local area networks or the Internet via radio waves, enabling high-speed data exchange.

Function：Most RTK receivers have a built-in web UI (web server). Firmware upgrades, data downloads, or parameter configurations can be performed in a browser via a smartphone or computer's Wi-Fi connection.

4.Bluetooth/NFC

Bluetooth is a wireless technology standard that supports short-range communication between devices.

NFC is a short-range, high-frequency wireless communication technology that allows electronic devices to perform contactless, peer-to-peer data transfers when they are close to each other.

Function：Bluetooth is a wireless technology that enables short-range communication between devices.The surveyor simply brings the NFC-enabled controller close to the gnss receiver, and Bluetooth automatically activates, pairs, and connects.

5.USB

USB is a standard interface technology used for transferring data and power between computers and external devices.

Function：The USB interface supports the import and export of observation data, system firmware upgrades, high-power fast charging, and PC-based parameter configuration.

6.RS-232 port

RS232 is a classic serial communication standard that supports the integration of third-party sensors and communication between industrial devices.

Function：It is typically used to connect an external high-power radio or depth sounder to a computer configuration.

7.Laser

GNSS laser refers to using laser technology with GNSS systems for accurate positioning and distance measurements.

Function：

green lasers to RTK systems improves visibility, accuracy, and efficiency while ensuring safety by enabling precise calibration in inaccessible or hazardous areas. APEKS AP30 laser and AP40laser+ are with green laser technology. AP30laser is with 30m laser surveying ,AP40laser+ is upgraded to 120m laser.

8.Camera

GNSS camera helps new users navigate complex environments and improves efficiency by providing enhanced positioning, obstacle detection, and environmental awareness.

Functions:

Image surveying: Remotely captures images of dangerous or obstructed areas where poles cannot be erected, directly extracting 3D coordinates from the photos.

AR STAKEOUT: Overlays 3D target points onto the real-world scene, providing intuitive guidance like in-car navigation, eliminating the need for traditional map-based point finding.

Assisted Laser surveying: Enhances spot recognition through image algorithms during laser measurement, ensuring accurate target locking even against complex backgrounds.

To help you understand more intuitively which communication interfaces APEKS gnss supports, we have summarized the core communication interfaces mentioned above as follows.

Conclusion

Every communication interface of the APEKS receiver safeguards the reliability and convenience of high-precision operations. Whether facing the challenges of remote mountains with no signal or pursuing high-speed efficiency on smart construction sites, this "all-around connectivity" interface layout allows surveyors to freely switch to the optimal solution according to the environment, truly achieving "centimeter-level freedom" in complex environments.