Overview

The TOXU TX-RTK-UM982-Kit is a complete dual-antenna RTK GNSS receiver solution based on the Unicore UM982 high-precision positioning module. It is designed for UAVs, autonomous vehicles, robotics and other navigation systems requiring both centimeter-level positioning and reliable heading output.

The receiver supports GPS, BDS, GLONASS, Galileo and QZSS multi-frequency signals. With compatible RTCM correction data, it can provide horizontal RTK accuracy of 0.8 cm + 1 ppm and vertical RTK accuracy of 1.5 cm + 1 ppm.

Two GNSS antennas allow the UM982 receiver to calculate moving-baseline GNSS heading using carrier-phase measurements. This provides a non-magnetic yaw source that is less affected by motors, electrical systems, metal structures and other sources of magnetic interference.

Moving-baseline GNSS heading does not require correction data from a fixed RTK base station. However, external RTCM correction data is required when centimeter-level absolute RTK positioning is needed.

The receiver also includes an IST8310 electronic compass, status indicators and a flight controller safety button. It can operate as an RTK rover, moving-baseline rover or manually configured GNSS base station.

The TX-RTK-UM982-Kit provides a cost-effective integration option for projects evaluating the Holybro H-RTK Unicore UM982 dual-antenna receiver. It is an independent TOXU product, and final compatibility must be verified according to the connector, pin definition, firmware and system configuration.

Key Features

Unicore UM982 GNSS Platform

Uses the Unicore UM982 multi-constellation and multi-frequency GNSS module for high-precision positioning and dual-antenna heading applications.

Dual-Antenna Moving-Baseline Heading

Calculates yaw from the relative position of two GNSS antennas, providing heading information without relying on the surrounding magnetic field.

Reduced Magnetic Interference

GNSS-based heading is suitable for UAVs and robotic systems affected by motors, power cables, metallic structures and other magnetic interference sources.

Multi-Constellation GNSS Support

Supports BDS, GPS, GLONASS, Galileo and QZSS satellite systems for improved positioning availability.

Multi-Frequency Signal Tracking

Tracks BDS B1/B2/B3, GPS L1/L2/L5, GLONASS L1/L2, Galileo E1/E5a/E5b and QZSS L1/L2/L5 signals.

Centimeter-Level RTK Positioning

Provides horizontal RTK accuracy of 0.8 cm + 1 ppm and vertical RTK accuracy of 1.5 cm + 1 ppm when suitable correction data is available.

High-Accuracy Heading Output

Supports heading accuracy of 0.1° with a 1 m antenna baseline under suitable operating conditions.

20 Hz Navigation Output

Supports positioning, heading and raw observation data output at rates up to 20 Hz.

Integrated IST8310 Compass

Includes an IST8310 electronic compass as an additional magnetic heading source for compatible flight control systems.

Flexible Operating Modes

Supports operation as an RTK rover, moving-baseline rover or manually configured GNSS base station.

Multiple Communication Interfaces

Provides a 10-pin JST-GH flight controller interface, a 6-pin auxiliary UART interface and a USB Type-C configuration interface.

PX4 and ArduPilot Integration

Designed for integration with compatible Pixhawk flight controllers using supported PX4 or ArduPilot firmware.

Complete Dual-Antenna Kit

Includes two high-precision helical antennas, antenna mounts, SMA cables and multiple JST-GH connection cables.

Technical Specifications

Applications

• UAV moving-baseline GNSS heading

• Multirotor and fixed-wing aircraft

• Autonomous vehicle navigation

• Robotics and unmanned ground vehicles

• Systems operating near motors and magnetic interference

• Precision agriculture equipment

• UAV mapping and aerial surveying

• Centimeter-level RTK positioning

• GNSS base and rover systems

System Integration

The TX-RTK-UM982-Kit uses two GNSS antennas for moving-baseline heading. The primary and secondary antennas must be installed rigidly on the same vehicle with a known baseline distance and orientation.

Increasing antenna separation generally improves heading performance. The specified heading accuracy of 0.1° is based on a 1 m antenna baseline under suitable signal conditions.

For correct yaw output, the antenna orientation and heading offset must be configured according to the installation direction. The primary antenna can be placed in front of the secondary antenna or installed using another known orientation with the corresponding software offset.

Moving-baseline heading can operate without RTCM correction data from a fixed base station. This allows the receiver to provide a non-magnetic yaw source even when centimeter-level absolute positioning is not required.

Centimeter-level absolute RTK positioning requires compatible RTCM correction data from a fixed base station, CORS network or NTRIP service.

The receiver may also be operated with only one antenna for conventional GNSS positioning. In single-antenna operation, the primary antenna connector must be used and moving-baseline heading will not be available.

The 10-pin JST-GH interface is intended for connection to compatible Pixhawk GPS1 ports. The supplied 10-pin to 6-pin cable can be used with compatible GPS2 ports. The pin definition, voltage and flight controller documentation must be checked before installation.

The USB Type-C interface supports receiver configuration and computer communication. Base-station operation may require manual configuration using Unicore UPrecise or compatible ground-control software.

The integrated IST8310 is an electronic compass. The product does not include a specified gyroscope or accelerometer and must not be described as a GNSS/INS receiver.

Standard Kit Configuration

Complete GNSS Solution Support

GNSS Antenna Matching

TOXU provides matched GNSS antennas including ceramic antennas, patch antennas, helical antennas and survey-grade RTK antennas for different positioning requirements.

RF Cable Assembly

TOXU provides customized RF cable assemblies with SMA, MMCX, MCX, TNC, FAKRA and other connector options.

Connector Solution

TOXU supports RF connector selection, Pixhawk connection cables and customized interconnection solutions.

Dual-Antenna System Integration

TOXU supports antenna selection, baseline planning, cable matching and mounting solutions for moving-baseline GNSS heading systems.

GNSS Board Development

TOXU can integrate GNSS modules into customized receiver boards according to customer requirements.

Hardware Customization

TOXU supports PCB design, prototype development and mass production for customized GNSS positioning products.

Why Choose TOXU

Complete Dual-Antenna Heading Kit

The TX-RTK-UM982-Kit includes the receiver, two helical GNSS antennas, antenna mounts, RF cables and flight controller cables required for system integration.

Non-Magnetic Heading Solution

Moving-baseline GNSS heading provides a reliable yaw source for platforms affected by motors, high-current wiring and surrounding metal structures.

Cost-Effective UM982 Integration

TOXU provides an independent UM982-based solution for customers seeking functionality comparable to the Holybro H-RTK Unicore UM982 while controlling system integration costs.

Customized Hardware Support

TOXU can customize antenna models, RF cable lengths, flight controller connectors, receiver enclosures and mounting components.

Prototype and Mass Production

TOXU supports engineering evaluation, prototype development, customized assembly and volume production.

FAQ

Q: What GNSS module is used in the TX-RTK-UM982-Kit?

The receiver is based on the Unicore UM982 multi-constellation, multi-frequency RTK GNSS module.

Q: Does the kit provide GNSS heading?

Yes. Two GNSS antennas allow the UM982 to calculate moving-baseline yaw, also known as GNSS heading.

Q: Does GNSS heading require an RTK base station?

No. Moving-baseline GNSS heading can operate without correction data from a fixed RTK base station. External correction data is required for centimeter-level absolute RTK positioning.

Q: What heading accuracy does the receiver support?

The specified heading accuracy is 0.1° with a 1 m antenna baseline under suitable operating conditions.

Q: Can the receiver operate with only one antenna?

Yes. It can operate as a conventional single-antenna GNSS receiver when the primary antenna connector is used, but moving-baseline heading will not be available.

Q: Does the kit support centimeter-level RTK positioning?

Yes. With compatible RTCM correction data and suitable operating conditions, it supports horizontal RTK accuracy of 0.8 cm + 1 ppm and vertical accuracy of 1.5 cm + 1 ppm.

Q: Does the receiver include a compass?

Yes. An IST8310 electronic compass is included as an additional magnetic heading source.

Q: Is the TX-RTK-UM982-Kit an INS receiver?

No. The specified product includes an electronic compass but does not include a gyroscope or accelerometer, so it must not be classified as a GNSS/INS receiver.

Q: Is it compatible with Pixhawk flight controllers?

The kit includes JST-GH cables intended for compatible Pixhawk GPS1 and GPS2 ports. The connector pin definition, voltage and firmware configuration must be confirmed before installation.

Q: Is this product manufactured by Holybro?

No. The TX-RTK-UM982-Kit is an independent TOXU product designed for similar UM982 dual-antenna UAV applications. It is not manufactured or endorsed by Holybro.

Q: Can TOXU provide customized GNSS solutions?

Yes. TOXU provides complete GNSS hardware integration services including customized receiver boards, GNSS antennas, RF cable assemblies, connectors and PCB hardware development.

Q: Can TOXU customize the antenna baseline and mounting solution?

Yes. TOXU can provide different antenna models, RF cable lengths, antenna mounts and installation recommendations according to the required baseline and vehicle structure.

Q: Can the UM982 module be integrated into a customized board?

Yes. TOXU can integrate the UM982 or other GNSS modules into customized PCB boards and provide prototype development and mass production support.

Q: Can TOXU provide antenna and cable solutions?

Yes. TOXU provides matched GNSS antennas, RF cables and connectors to complete the positioning system solution.