VK D3-H — Dual-Antenna RTK Positioning & Heading Module

The VK D3-H is a professional high-precision RTK GNSS module designed for industrial UAVs, agricultural drones, fixed-wing aircraft, VTOL platforms, and autonomous navigation systems.

Featuring dual-antenna GNSS technology, multi-frequency satellite reception, and real-time heading determination, the D3-H provides accurate positioning and orientation information for demanding unmanned aircraft applications.

With centimeter-level RTK accuracy, high-speed positioning updates, and compatibility with selected VK flight controllers, the D3-H is an advanced navigation solution for professional UAV integration.

Centimeter-Level RTK Positioning

The D3-H uses Real-Time Kinematic technology to provide high-precision satellite positioning.

When receiving valid correction data from a compatible RTK base station or correction service, the system can achieve:

Horizontal RTK Accuracy: 0.8 cm + 1 ppm

Vertical RTK Accuracy: 1.5 cm + 1 ppm

This level of positioning accuracy is particularly useful for applications requiring precise navigation and repeatable flight paths.

Typical applications include precision agriculture, industrial inspection, autonomous landing, mapping, and surveying.

Dual-Antenna GNSS Heading

The D3-H features a dual-antenna architecture that provides both positioning and heading information.

By calculating the relative position between two GNSS antennas, the system determines aircraft orientation without relying exclusively on a conventional magnetic compass.

This technology helps maintain reliable heading measurements in environments affected by magnetic interference.

Heading Accuracy: 0.2° with a 1 m antenna baseline

For optimal performance, both antennas must be installed with appropriate separation and orientation.

Multi-Constellation GNSS Reception

The D3-H supports multiple satellite navigation systems:

GPS

GLONASS

Galileo

BeiDou

QZSS

By receiving signals from several satellite constellations, the module improves satellite availability and positioning reliability.

This is particularly beneficial for professional UAV operations in complex environments.

Multi-Frequency GNSS Technology

The D3-H supports multi-frequency GNSS reception.

This technology helps reduce positioning errors caused by atmospheric disturbances and improves RTK performance.

Supported signal bands include:

GPS — L1 / L2

GLONASS — G1 / G2

Galileo — E1 / E5b

BeiDou — B1 / B2 / B3

QZSS — L1 / L2

Multi-frequency operation helps improve positioning reliability and RTK initialization performance.

High-Precision Heading Without Magnetic Calibration

Unlike conventional single-antenna GPS modules, the D3-H calculates heading using satellite positioning.

This provides an alternative to magnetic compass-based orientation estimation.

GNSS heading is particularly useful for large UAVs equipped with powerful electric motors, high-current power distribution systems, and other sources of electromagnetic interference.

It is also suitable for autonomous vehicles operating near metal structures or industrial equipment.

Fast RTK Initialization

The D3-H is designed for rapid satellite acquisition and RTK initialization.

Its manufacturer-published reference characteristics include:

Cold Start: Less Than 25 Seconds

Signal Reacquisition: Less Than 1 Second

RTK Initialization: Less Than 5 Seconds — Typical

Initialization Reliability: Greater Than 99.9%

Actual performance depends on satellite reception, correction data availability, antenna installation, and environmental conditions.

10 Hz Positioning Updates

The D3-H supports real-time navigation data updates at 10 Hz.

Positioning Data Update Rate: 10 Hz

GNSS Observation Data Update Rate: 10 Hz

This provides frequent positioning information to compatible flight controllers during autonomous missions.

Standard & Differential GNSS Positioning

In addition to RTK operation, the D3-H supports standalone GNSS and differential positioning.

The published positioning performance includes:

Standalone GNSS

Horizontal Accuracy: 1.5 m RMS
Vertical Accuracy: 2.5 m RMS

Differential GNSS

Horizontal Accuracy: 0.4 m RMS
Vertical Accuracy: 0.8 m RMS

RTK Positioning

Horizontal Accuracy: 0.8 cm + 1 ppm
Vertical Accuracy: 1.5 cm + 1 ppm

This flexibility allows the module to provide positioning information under different correction configurations.

Dynamic Takeoff & Landing

The D3-H is designed for professional UAV applications requiring dynamic positioning.

When integrated with compatible flight controllers and navigation systems, it can support applications involving:

Precision Takeoff

Autonomous Landing

Moving-Platform Operations

Dynamic Position Tracking

Vehicle-Based UAV Deployment

The availability of these functions depends on the selected autopilot and system configuration.

VK Flight Controller Integration

The D3-H is designed for integration with compatible VK flight control systems.

Supported applications include selected agricultural and industrial controllers, such as:

VK V9-AG

VK V10-PRO

VK V12

The module provides positioning and heading information to the connected flight controller through the appropriate navigation interface.

Compatibility must be verified against the selected controller and firmware version.

RTK Base Station Compatibility

The D3-H can operate with compatible RTK correction sources.

Within the VK ecosystem, it is intended for integration with compatible D2B and D3B RTK base station systems.

A correctly configured RTK base station provides correction information that enables centimeter-level positioning.

The airborne D3-H module and ground base station perform different functions and are not interchangeable.

Professional UAV Applications

The VK D3-H is suitable for:

Industrial Multirotor UAVs

Fixed-Wing Aircraft

VTOL Platforms

Agricultural Spraying Drones

Mapping and Surveying UAVs

Precision Landing Systems

Industrial Inspection Aircraft

Autonomous Logistics Platforms

Moving-Platform UAV Operations

Research and Development Systems

Technical Specifications

Product: VK D3-H
Brand: VK
Module Type: Dual-Antenna RTK GNSS Positioning & Heading Module

Primary Functions: High-Precision Positioning / GNSS Heading Determination

GNSS Technology: Multi-Constellation / Multi-Frequency RTK

Antenna Configuration: Dual Antenna

Supported GNSS: GPS / GLONASS / Galileo / BeiDou / QZSS

GPS Frequencies: L1 / L2
GLONASS Frequencies: G1 / G2
Galileo Frequencies: E1 / E5b
BeiDou Frequencies: B1 / B2 / B3
QZSS Frequencies: L1 / L2

Standalone Horizontal Accuracy: 1.5 m RMS
Standalone Vertical Accuracy: 2.5 m RMS

DGPS Horizontal Accuracy: 0.4 m RMS
DGPS Vertical Accuracy: 0.8 m RMS

RTK Horizontal Accuracy: 0.8 cm + 1 ppm
RTK Vertical Accuracy: 1.5 cm + 1 ppm

Dual-Antenna Heading: Supported
Heading Accuracy: 0.2° — 1 m Antenna Baseline

Cold Start: <25 s
Signal Reacquisition: <1 s
RTK Initialization Time: <5 s — Typical
RTK Initialization Reliability: >99.9%

GNSS Observation Update Rate: 10 Hz
Positioning Update Rate: 10 Hz

Velocity Accuracy: 0.03 m/s RMS
Time Accuracy: 20 ns RMS

Correction Formats: RTCM 3.0 / 3.2
Data Protocols: NMEA 0183 / Unicore

Flight Controller Integration: Compatible VK Autopilot Systems

Operating Voltage: 5 V

Dimensions: 85 × 49 × 21 mm

Weight: Approximately 100 g

What’s Included

1× VK D3-H RTK Positioning Module

2× GNSS Antennas

1× Connection Cable

The package contents should be confirmed against the commercial configuration supplied by VK.

An RTK base station or compatible correction service is required to achieve centimeter-level RTK positioning.

The D3-H supports dual-antenna heading. Both antennas must be installed correctly to obtain reliable orientation measurements.

Flight controller, RTK base station, radio telemetry equipment, and other UAV accessories are not included unless explicitly specified.

Positioning and heading performance depend on satellite visibility, antenna configuration, correction quality, and operating conditions.