Centimeter-level positioning has become an important requirement for drones, autonomous mobile robots, UGVs, agricultural vehicles, surveying systems, and other outdoor autonomous platforms. But choosing an RTK GNSS system is not only about positioning accuracy.
For many robotics projects, the bigger challenge is system architecture.
Do you need a local RTK base station or an existing NTRIP service? Does the robot require heading as well as position? Will one base station serve one vehicle or multiple robots? Do you need 4G connectivity, long-range radio communication, or direct integration with a flight controller?
A modular RTK architecture makes it possible to answer these questions according to the application instead of forcing every project into the same hardware configuration.
The LucSys Robotics T-RTK UM982 Centimeter-Level GNSS Positioning Module is designed around this principle: start with the positioning module you need, then combine it with antennas, communication modules, base stations, and onboard systems according to the deployment environment.
Why Modular RTK GNSS Matters
Traditional RTK systems are often purchased as a fixed package: one base station, one rover, and a predefined communication method.
That may work for a single vehicle, but robotics projects are rarely static.
A university team may initially test one UGV and later expand to several mobile robots. A drone developer may begin with an NTRIP correction service but later need an independent field base station. An outdoor autonomous robot may use 4G in urban environments while requiring radio communication at a remote test site.
A modular architecture allows the RTK system to evolve with the project.
Instead of replacing the entire positioning system, developers can configure different combinations of:
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Mobile RTK rover modules
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RTK base stations
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Dual GNSS antennas
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4G communication modules
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Long-range radio modules
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Portable integrated base stations
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CORS/NTRIP correction services
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Pixhawk, embedded computers, ROS systems and other onboard controllers
This approach is particularly useful for research platforms, prototype development and multi-robot systems, where hardware configurations frequently change during development.
One Positioning Module, Multiple Deployment Options
The T-RTK is built around the UM982 multi-constellation, multi-frequency GNSS receiver, supporting GPS, BeiDou, GLONASS, Galileo, QZSS and SBAS signals.
Depending on the application, the mobile module can receive RTK corrections through different architectures.
1. Rover + CORS/NTRIP
If a reliable CORS or NTRIP service is available in the operating area, the robot can obtain correction data through the network.
This configuration can be useful for autonomous vehicles operating in areas with stable internet connectivity because a dedicated local base station may not be necessary.
2. Rover + Local RTK Base Station
For research fields, construction sites, farms or private test areas, developers can deploy their own RTK base station.
This provides a locally controlled positioning infrastructure and reduces dependence on external correction services.
3. Rover + Base Station + Radio
Where cellular connectivity is unavailable or undesirable, correction data can be transmitted using radio communication.
The available radio architecture supports point-to-multipoint networking, making it possible to distribute RTK correction data to multiple mobile nodes rather than building an independent base station for every vehicle.
4. Rover + Base Station + 4G
For distributed systems or larger operating areas, 4G communication can be integrated into the RTK architecture.
This can be useful when the base station and mobile platforms are separated by greater distances or when correction information needs to be distributed through an existing network.
5. Portable Integrated Base Station
Field robotics often requires equipment to be transported and deployed quickly.
An integrated portable base station combines the GNSS base, antenna, battery and tripod into one field-deployable system. Instead of assembling several independent components every time a test is performed, the complete base station can be transported to the site and set up as required.
This is especially useful for outdoor robotics experiments, UAV testing, surveying and temporary autonomous-system deployments.
One RTK Base Station for Multiple Robots
One of the most useful advantages of a modular RTK architecture appears when a project expands from a single robot to a multi-robot system.
RTK correction data is not necessarily limited to one rover.
With an appropriate communication network, one RTK base station can distribute correction information to multiple mobile units. The T-RTK radio system supports point-to-multipoint centralized networking, with a theoretical maximum of up to 100 nodes.
For example, a robotics laboratory could deploy:
1 RTK base station → multiple UGVs
or:
1 RTK base station → multiple UAVs
Each vehicle carries its own mobile positioning module, while the robots share the correction infrastructure.
This architecture can reduce hardware duplication and simplify deployment when developing robot fleets, drone swarms or heterogeneous autonomous systems.
It is particularly relevant to applications such as multi-UAV experiments, cooperative robotics, autonomous vehicle fleets, agricultural robots and distributed outdoor sensing platforms.
Position Is Not Enough: Dual-Antenna Heading
For autonomous vehicles, knowing position alone is not always sufficient.
A stationary or slow-moving robot may have difficulty estimating its orientation accurately from GNSS velocity information alone. Magnetometers can also be affected by motors, steel structures, electrical systems and other magnetic disturbances.
Dual-antenna GNSS provides another option.
By measuring the relative positions of two GNSS antennas installed on the same platform, the receiver can estimate the vehicle's heading even when the robot is stationary.
The T-RTK UM982 supports dual GNSS antenna inputs, with specified heading accuracy of 0.1° RMS with a 1 m antenna baseline. Its RTK positioning specification is 0.8 cm + 1 ppm horizontally and 1.5 cm + 1 ppm vertically, with positioning output rates configurable up to 20 Hz.
This makes dual-antenna RTK particularly useful for UAVs, UGVs, autonomous boats, agricultural vehicles and mobile robots that require both accurate global position and heading information.
Designed for Robotics Integration
High positioning accuracy is only useful if the GNSS data can be integrated into the rest of the robot.
For this reason, interface flexibility is another important part of a modular positioning system.
The T-RTK provides USB, UART, PPS and I²C interfaces together with SMA and MMCX antenna connections. It supports NMEA-0183 and Unicore data formats as well as RTCM 3.X correction data.
For robotics development, positioning, velocity, heading and related GNSS information can be accessed through ROS, Python and C++.
The module can also connect with compatible Pixhawk flight controllers, making it suitable for UAV development as well as ground-robot applications.
This allows the same positioning hardware to be used across different development environments rather than being tied to one specific robot controller.
RTK GNSS for UAVs
For UAV applications, centimeter-level GNSS can support accurate waypoint navigation, mapping, inspection, precision landing and coordinated multi-drone experiments.
Dual-antenna heading can also provide an independent heading reference, while modular correction links allow developers to select between NTRIP, radio or private base-station infrastructure depending on the operating environment.
For multi-UAV systems, sharing one RTK base station between several drones can be particularly attractive because every aircraft does not require a separate reference station.
RTK GNSS for UGVs and Mobile Robots
Outdoor UGVs often combine GNSS with LiDAR, cameras, IMUs and wheel odometry.
RTK GNSS can provide a globally referenced position input to the localization stack while local sensors handle short-term motion estimation and obstacle perception.
This can be useful for autonomous navigation in farms, campuses, industrial areas, construction sites and other large outdoor environments.
For researchers developing different UGV platforms, the modular form factor also makes it easier to move the positioning architecture between robots without redesigning the entire navigation system.
RTK GNSS for Multi-Robot Research
Multi-robot systems introduce an additional requirement: every robot needs to operate in a consistent coordinate framework.
Accurate global positioning can simplify experiments involving cooperative navigation, formation control, distributed sensing and heterogeneous robot coordination.
A shared RTK base station can provide a common correction reference while individual rover modules supply positioning information to each robot.
This makes the system useful not only as a GNSS sensor, but also as part of the positioning infrastructure for an entire robot fleet.
How Should You Configure an RTK System?
There is no single RTK configuration that is best for every robotics project.
For a single robot operating in an area with reliable NTRIP coverage, a mobile RTK module may be sufficient.
For an independent outdoor test site, a mobile module plus a local base station may be more appropriate.
For multiple robots, one base station combined with multiple rover modules and a point-to-multipoint communication link can provide a more scalable architecture.
For UAVs or vehicles requiring accurate orientation at low speed, a dual-antenna configuration should also be considered.
And for temporary field deployments, a portable integrated base station can simplify transport and setup.
The key is to build the positioning system around the application rather than adapting the application to a fixed RTK package.
A Flexible Foundation for Autonomous Systems
As autonomous systems move from single prototypes toward multi-robot deployments, positioning infrastructure needs to become more flexible as well.
The LucSys Robotics T-RTK UM982 combines centimeter-level RTK positioning, dual-antenna heading, multiple correction methods, flexible communication options and robotics-oriented software interfaces in a modular platform.
Developers can start with a simple rover configuration and later expand to a private base station, radio or 4G communication, dual antennas or multiple mobile nodes.
For UAVs, UGVs, autonomous robots and multi-agent research platforms, this modular approach provides a practical way to build a high-precision GNSS system that can grow together with the project.
Explore the LucSys Robotics T-RTK Centimeter-Level GNSS Positioning Module to select the mobile unit, base station and communication configuration that best matches your autonomous-system application.