Local Base Station vs. Network RTK

Whether you're working in drone mapping, land surveying, precision agriculture, or construction… accurate positioning is crucial.

When achieving centimeter-level GNSS positioning accuracy in the field, both local base stations and network RTK are mature and reliable professional-grade solutions. Depending on your drone mapping workflow, either can be a suitable tool.

Mapping drones rely on RTK (Real-Time Kinematics) technology to achieve centimeter-level accuracy. When using RTK correction methods, both local base station RTK and network RTK can support centimeter-level accuracy mapping.

Which GNSS Correction Solution Is Better for Precision Positioning? Let's take a closer look.

Do you know what RTK is?

RTK technology, short for Real-Time Kinematics, is a satellite positioning technology that uses correction data to improve GPS positioning accuracy.

RTK doesn't just rely on satellite signals; it compares satellite data received by the rover with correction data from a reference station.

Standard GPS positioning accuracy is 1–5 meters, while RTK technology offers 1–3 centimeters. This is why surveyors prefer drones for centimeter-level accuracy.

What is a Local Base Station?

A local base station is a physical GNSS receiver placed at a known location. It continuously receives satellite signals and sends correction data directly to nearby equipment. Depending on site conditions, you may also need to establish GCP points.

How a Local Base Station Works?

Communication at a local base station is via radio transmission, UHF communication, and a dedicated wireless module.

The base station receives satellite signals, calculates positioning errors, and sends correction data to the rover. The rover adjusts its coordinates in real time to confirm positioning accuracy step by step.

Even without sending correction information to the drone in real time, you can still use a post-processing workflow.

Advantages and Disadvantages of Local Base Stations

Advantages of Local Base Stations

The biggest advantage of local base stations is that they do not require a mobile network, making them ideal for remote areas.

In large, complex areas such as suburban farms, mountainous regions, construction sites, mining areas, and archaeological sites, surveying and large-scale professional projects can leverage the advantages of local base stations to quickly complete geographic surveying and mapping, obtaining accurate data.

Secondly, establishing a local base station offers strong independence and autonomy; it requires no service subscriptions and does not rely on external infrastructure, allowing control of the entire correction system.

Local base stations also maintain low network latency and more stable signal quality.

Disadvantages of Local Base Stations

Deploying a local base station incurs higher initial costs, especially hardware costs. Furthermore, the setup process is time-consuming, and the radio transmission distance is limited. Therefore, ROI needs to be considered when establishing a Local Base Station, which is typically applicable to large-scale surveying projects.

What is Network RTK?

Network RTK utilizes an existing network of permanent reference stations. This means your equipment does not need to carry its own base station but receives correction data via the internet.

Network RTK obtains RTK data through NTRIP, which simplifies positioning. Meanwhile, because the calibration data comes from a continuously operating network of reference stations, real-time centimeter-level positioning is also possible.

How Network RTK Works?

When using network RTK services, simply connect the drone to the internet and the RTK calibration service to receive calibration data from the network, and the precise location can be calculated in real time.

Advantages and Disadvantages of Network RTK

Advantages of Network RTK

Network RTK achieves centimeter-level accuracy mapping without the need to purchase additional hardware or physical base stations, resulting in lower upfront costs.

Network RTK also allows for rapid deployment; simply turn on the drone and connect to the RTK network to begin work, without the need to set up GCP points on-site.

Based on the advantages of NTRIP, accurate data can be obtained even when moving between multiple locations, offering greater flexibility.

Furthermore, the advantages of network RTK make carrying mapping drones more convenient, significantly reducing weight.

Disadvantages of Network RTK

Stable internet coverage is fundamental to network RTK; without a cellular signal, calibration data cannot be obtained. Poor network connectivity also reduces reliability. This is the biggest limitation.

When it comes to regional calibration networks, many RTK calibration service providers charge fees, such as monthly subscriptions or annual fees.

Local Base Station vs Network RTK: Which is better for drone operators?

Both network RTK and local base stations can achieve centimeter-level accuracy. The real difference lies not in the accuracy itself, but in how and when that accuracy is achieved. Network RTK offers greater convenience, improving measurement speed and operational efficiency, while local base stations offer greater independence and reliability.

For drone operators, the choice largely depends on the type of task. Generally, local base stations are preferred for remote areas, while network RTK is preferred for urban operations.

However, in many cases, experienced surveyors will flexibly utilize multiple methods based on site conditions, network connectivity, project size, and operational requirements.

If you prefer a hybrid approach, choosing the right RTK drone is crucial. Autel RTK drones support RTK, PPK, and network RTK.

Summary

The choice between network RTK and local RTK base stations is not based on which technology is generally better. Both systems provide centimeter-level accuracy and are powerful professional surveying solutions.

It all depends on the specific project requirements. Owning your own base station offers independence and reliability, but at a higher hardware cost. Network RTK offers flexible deployment and can quickly streamline workflows.

If you're still struggling to choose the right measurement method, take a closer look at our insights on Local Base Station vs. Network RTK.