To achieve sub-inch/centimeter-level precision and unlock transformative data insights, Real-Time Kinematic (RTK) and Post-Processed Kinematic (PPK) GPS emerge as critical enablers. However, understanding their nuances is key to maximizing their contributions.
See our list of supported drones here (including RTK drones)!
Real-Time Kinematic (RTK)
- Centimeter-level positioning: Real-time correction data from a strategically placed base station streamlines precise drone location determination during flight.
- Ideal for dynamic operations: RTK's instantaneous accuracy empowers real-time adjustments and monitoring of moving targets, making it suitable for construction site analysis or infrastructure inspection.
- Minimized error risk: Immediate correction mitigates atmospheric and satellite clock error influences, reducing data uncertainty.
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RTK coverage is included for advanced, teams and enterprise users in DroneDeploy
Considerations
- Base station dependence: Requires a stationary reference point with reliable correction signal access, potentially limiting operational flexibility.
- Range limitations: Accuracy degrades with increased distance from the base station, impacting project scalability.
- Signal susceptibility: Obstacles or atmospheric conditions can disrupt correction signals, compromising accuracy in specific environments.
- DroneDeploy displays the RTK coverage if you are using a Mavic 3 Enterprise when planning a flight.
See additional RTK articles:
Mavic 3 Enterprise RTK workflow
RTK Mapping with the DJI Phantom 4 RTK
Single GCP Processing for RTK and PPK captures
Post-Processed Kinematic (PPK)
- Flexibility and reach: Eliminates base station dependency, enabling drone operations across vast areas or remote locations with access to satellite signals.
- Cost-effective alternative: By leveraging existing reference station networks, PPK removes the need for additional base station infrastructure setup.
- High post-processing accuracy: Similar to RTK, PPK achieves sub-inch/centimeter-level positioning through meticulous post-flight data analysis and comparison with reference station measurements.
- PPK Processing is included for advanced, teams, or enterprise customers in DroneDeploy
Considerations
- Processing delay: Obtaining definitive location data requires post-processing, introducing a wait time compared to RTK's real-time feedback - about 15 additional minutes are required for PPK processing.
- Error susceptibility: Processing relies on accurate reference data and can be susceptible to potential errors in reference stations or network connectivity.
- Limited real-time applications: Post-processing renders PPK unsuitable for tasks requiring immediate location information, such as real-time collision avoidance or dynamic obstacle tracking.
See additional PPK articles:
Making the Optimal Choice
The ideal technology selection hinges on your specific project requirements and operational realities:
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Choose RTK for:
- Mission-critical projects demanding real-time, sub-inch/centimetre-level accuracy.
- Operations within range of a reliable base station.
- Applications where minimizing data processing delays is crucial.
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Choose PPK for:
- Mapping large areas or remote locations with minimal infrastructure setup.
- Cost-sensitive projects where base station installation is impractical.
- Scenarios where post-processing delay is acceptable and real-time location data is not essential.
- Missions that exceed 10 minutes in flight time (region dependent, see our map for required PPK flight times).
Remember, both RTK and PPK offer powerful tools for achieving high-precision drone positioning. By understanding their strengths and limitations, you can confidently navigate the landscape of drone data acquisition and unlock the full potential of your aerial mapping initiatives.
See: DroneDeploy's Flying with Ground Control Section for how to capture and upload RTK data