Modular RTK GNSS for Drones and Robots: One Base Station, Multiple Rovers

Centimeter-level positioning is becoming essential for drones, UGVs, autonomous robots, agricultural vehicles and outdoor robotic systems.

But accuracy is only one part of the problem.

Real-world robotics projects also need flexible correction-data transmission, reliable heading, easy integration with different platforms, and the ability to expand from a single robot to a multi-robot system.

This is why a modular RTK GNSS architecture can be more practical than a fixed base-and-rover kit.

One RTK Platform, Multiple Configurations

Different robots operate in different environments.

A UAV operating in a city may receive RTK correction data directly from a CORS/NTRIP service over 4G. A UGV working in a remote field may instead require a local RTK base station and radio communication.

A modular RTK system allows developers to select only the components required for each application.

Typical configurations can include:

• Mobile RTK rover

• RTK base station

• Portable integrated base station

• 4G communication module

• Long-range radio module

• Single-antenna positioning

• Dual-antenna positioning and heading

The T-RTK UM982 Modular RTK GNSS System is designed around this flexible architecture.

Instead of replacing the complete positioning system when the application changes, developers can combine different modules according to the robot, communication environment and deployment requirements.

One Base Station, Multiple Drones

For multi-drone applications, high-precision positioning is only part of the challenge.

Efficient RTK correction distribution is equally important.

Rather than deploying a separate base station for every UAV, one RTK base station can provide correction data to multiple rover units.

In a multi-drone configuration, several UAVs can therefore share the same RTK correction source while maintaining their own high-precision positioning.

This architecture is particularly useful for:

• Drone swarms

• Multi-UAV research

• Multi-robot systems

• Agricultural robot fleets

• Autonomous vehicle testing

• Heterogeneous robotic platforms

In our multi-drone demonstration, three UAVs share one RTK base station and perform a coordinated flight test.

This reduces duplicated infrastructure and makes it easier to scale from one robot to a larger robotic fleet.

Dual-Antenna RTK for Positioning and Heading

Some robotic applications require more than position.

Reliable heading information is important for UAVs, autonomous vehicles and mobile robots, especially during low-speed operation or when the vehicle is stationary.

A dual-antenna RTK configuration can provide both centimeter-level positioning and heading information based on the GNSS antenna baseline.

This makes dual-antenna RTK particularly suitable for applications such as:

• UAV navigation

• Autonomous UGVs

• Agricultural machinery

• Mobile mapping

• Robotic inspection

• Multi-robot coordination

By combining positioning and heading in the same GNSS architecture, developers can simplify the overall navigation system.

CORS, 4G or Local RTK Base Station

A modular RTK system should also adapt to different communication environments.

Where cellular coverage and CORS services are available, a 4G module can receive NTRIP RTK correction datadirectly from the network.

For remote areas, research fields or private test sites, users can deploy their own RTK base station and distribute RTCM correction data through a radio or local network.

This gives developers several deployment options:

CORS + 4GSuitable for robots operating in areas with reliable mobile networks.

Local Base Station + RadioSuitable for farms, outdoor testing areas and remote environments.

Local Base Station + Multiple RoversSuitable for multi-drone and multi-robot systems.

Portable OneBase StationSuitable for temporary field deployment and mobile robotics experiments.

The positioning architecture can therefore change with the application without changing the entire RTK platform.

RTK GNSS Designed for Robotics Integration

For robotics developers, interfaces and software support are just as important as positioning accuracy.

The T-RTK UM982 supports common hardware interfaces including USB, UART, PPS and I²C, while selected configurations support integration with compatible Pixhawk flight controllers.

ROS, Python and C++ support also makes it easier to access GNSS data such as:

• Position

• Velocity

• Heading

• RTK status

• GNSS information

This allows the same RTK hardware to be integrated into UAVs, UGVs, ROS robots and autonomous research platforms.

A Scalable RTK Architecture for Multi-Robot Systems

For a single prototype, almost any RTK receiver may be enough.

The real advantage of a modular system becomes clear when a project starts to scale.

The same RTK platform can support:

one robot → multiple robotssingle antenna → dual antennaCORS → private base station4G → radio communicationsingle rover → multiple rovers sharing one base station

For robotics teams working with different platforms, this creates a more reusable and scalable positioning architecture.

Instead of treating RTK as an individual sensor installed on each robot, it can become a shared positioning infrastructure for the entire multi-robot system.

Explore the T-RTK UM982

The T-RTK UM982 Modular RTK GNSS System provides centimeter-level positioning with flexible Mobile, Base, OneBase, 4G, radio and dual-antenna configurations for UAVs, UGVs and autonomous robots.

View specifications and available configurations:https://shop.lucsysrobotics.com/products/centimeter-level-gnss-positioning-modulet-rtk