Carlson Viking Triple Fix RTK GNSS Receiver with IMU Tilt

High confidence RTK positioning for demanding fieldwork

The Carlson Viking RTK GNSS receiver is designed for professionals who need accurate positioning but cannot always work with a completely open view of the sky. Surveyors, construction crews, civil engineers and GIS teams regularly work beside buildings, machinery, trees and other objects that can reflect or obstruct GNSS signals. Viking combines a high-performance GNSS antenna, multi-frequency satellite tracking and Carlson’s GAMA RTK processing technology to provide a robust positioning solution for these environments.

The receiver can work as either a GNSS rover or RTK base station, making it suitable for anything from an individual survey pole to a complete base and rover system. It is designed by Carlson and assembled in Maysville, Kentucky using components from the USA and Europe.

TRIPLE-FIX RTK adds another check to your position

A major difference between the Carlson Viking and a conventional RTK receiver is its TRIPLE-FIX architecture. Inside the receiver are two GNSS RTK modules and three independent RTK engines, including Carlson’s GAMA RTK engine. Rather than relying on only one RTK calculation, the receiver can compare solutions generated by multiple engines.

In practical fieldwork, this gives the operator more information about whether independent calculations agree on the fixed position. That is particularly useful when surveying close to structures, under partial tree cover or around equipment where multipath and poor satellite geometry can make an apparently fixed solution less dependable. It does not remove the need for good survey practice, but it gives experienced operators another layer of information when assessing a measurement.

Measure with the pole tilted instead of perfectly level

The Viking has an integrated six-axis IMU for pole tilt compensation. Once initialized, the system calculates the position of the pole tip even when the receiver itself is not directly above it. There is no routine magnetic calibration procedure, and the inertial sensors are designed to operate without relying on the surrounding magnetic field.

This is particularly useful when measuring building corners, kerbs, fences, trenches, utility features, stockpiles and other points that are difficult to occupy with a perfectly vertical pole. Tilt compensation can be used at inclinations up to 60°, allowing the surveyor to concentrate on placing the pole tip on the point rather than repeatedly leveling the antenna.

Use the Viking as a rover or an RTK base

Viking is designed for flexible correction workflows. As a rover it can receive RTK corrections through an NTRIP connection, direct IP connection, Carlson services, serial connection or UHF radio. Support for common RTK correction protocols including RTCM3, CMR and CMR+ helps the receiver fit into existing GNSS infrastructure instead of limiting it to a single correction method.

When configured as a base station, Viking can transmit corrections through its integrated UHF radio or network-based connections. This makes it suitable for a dedicated local base and rover setup, temporary construction site control or integration into a wider positioning workflow. UHF configuration and permitted radio frequencies vary by region, so the correct regional radio configuration should always be selected for the country where the equipment will be used.

Multi-constellation GNSS for better satellite availability

The receiver has 632 GNSS channels and supports GPS, GLONASS, Galileo, BeiDou, QZSS and NavIC. Tracking multiple constellations and frequencies gives the positioning engine more observations to work with, which can be especially valuable where part of the sky is obstructed.

Carlson also incorporates signal processing intended to reduce the impact of multipath, radio interference, jamming and spoofing. Multipath is particularly relevant on construction sites and in built-up areas because GNSS signals can reflect from walls, vehicles and machinery before reaching the antenna. Reducing the influence of these reflected signals helps the receiver maintain a more stable positioning solution in places where GNSS work is normally more difficult.

Designed for surveying construction GIS and drone work

The Carlson Viking can cover several different roles within a geospatial operation. Land surveyors can use it for control, topographic surveys, setting out and detail collection. Construction teams can use accurate coordinates for site layout, checks and as-built measurements, while GIS crews can capture accurately positioned assets and features directly in the field.

• Surveying: RTK control, topographic work, stakeout and detailed point collection.
• Construction and civil engineering: site layout, position checks and as-built measurements.
• GIS and asset mapping: high-accuracy collection of utilities, infrastructure and other mapped features.
• Drone surveying: survey control and ground control workflows, with the Viking also able to operate as a correction base for compatible RTK drones when the required Carlson software and correction service are configured.
• Marine and specialist positioning: base or rover operation for applications requiring accurate GNSS coordinates and flexible data interfaces.

Connectivity for modern RTK workflows

The Viking includes an integrated 4G LTE cellular modem, configurable UHF radio, Wi-Fi and Bluetooth. Two RS232 interfaces and USB Ethernet provide additional options when the receiver needs to connect with other equipment or specialist software. This combination allows crews to choose between internet-based correction services and a local radio base depending on the project and available infrastructure.

A built-in web interface provides access to receiver configuration, GNSS status, correction settings, data logging and system administration. This is useful for technicians setting up a base station as well as surveyors who want deeper information about receiver status without relying only on the field software.

RINEX logging and static GNSS measurements

In addition to real-time RTK work, the Viking can record raw GNSS observations for static positioning. Recorded data can be exported as RINEX for post-processing and control establishment. Internal storage and a removable SD card provide options for keeping field data on the receiver, making the Viking useful for projects that combine real-time positioning with longer static observations.

Made for long days in the field

The housing carries an IP67 ingress protection rating and is designed to withstand temporary immersion in water. Carlson also specifies MIL-STD-810G shock and vibration testing. The receiver weighs approximately 1.35 kg with both batteries installed, while its dual hot-swappable battery arrangement allows one battery to be replaced while the receiver remains powered by the other.

This is useful during long field sessions because the receiver does not have to be shut down simply to exchange a depleted battery. Batteries can be charged externally, while the receiver also supports external power for longer-term base station installations.

Integrated with Carlson field software

The Carlson Viking is designed to work closely with Carlson SurvPC and Carlson Layout. Surveyors can monitor the RTK solution, IMU status and correction connection directly from their normal field workflow. Supported Carlson Hybrid+ workflows can also combine GNSS observations with robotic total station measurements, which can be useful on projects where some points are better observed with satellites and others with an optical instrument.

Carlson Viking from Global GPS Systems

Choosing the correct GNSS receiver is only part of building a reliable RTK workflow. Global GPS Systems can help determine whether the Carlson Viking should be configured as a rover, base station or complete base and rover system and can assist with compatible data collectors, field software, correction services and accessories. This is particularly useful when the receiver needs to work with an existing NTRIP network, local UHF base, construction workflow or RTK drone setup.

For surveyors, engineers and field crews looking for a professional RTK GNSS receiver with multi-engine position validation, calibration-free IMU tilt compensation and flexible base or rover operation, the Carlson Viking provides a versatile platform for both everyday measurement and more demanding positioning environments.