a-GEO L300 IMU RTK GNSS Rover and Base Set

Complete RTK GNSS base-and-rover system

The a-GEO L300 Rover and Base Set gives surveying and construction teams the equipment needed to establish a local RTK correction source and measure with a mobile rover. It is suitable for projects where centimetre-level positioning is required but access to an NTRIP or CORS correction network is unavailable, unreliable or not preferred.

One a-GEO L300 receiver is installed over a known or assigned reference point and configured as the base. The second L300 is mounted on the survey pole and used as the rover. Correction data is transmitted from the base to the rover through the integrated UHF radios, allowing the rover to calculate an accurate real-time position across the project area.

Designed for survey and construction workflows

This base-and-rover set can be used for construction layout, topographic measurement, road and utility projects, earthworks, site documentation, control surveys and accurate GIS data collection. It is particularly practical for contractors and surveyors working on private sites, remote projects or changing locations where setting up an independent base is more convenient than arranging access to a correction service.

The complete package includes an a-GEO S50III Android data collector, SurPro surveying software, a survey pole and controller bracket for rover work. A tripod, tribrach and adapter are supplied for securely mounting and centring the base receiver over the reference point.

1408-channel multi-constellation tracking

Each L300 receiver uses a 1408-channel GNSS board capable of tracking signals from GPS, GLONASS, Galileo, BeiDou, QZSS and SBAS constellations. Access to multiple constellations and frequencies provides the receiver with a broad selection of satellite observations throughout the working day.

Under suitable conditions, the documented single-baseline RTK accuracy is 8 mm + 1 ppm horizontally and 15 mm + 1 ppm vertically. Static GNSS observations are specified at 2.5 mm + 0.5 ppm horizontally and 5 mm + 0.5 ppm vertically. Actual results depend on factors such as satellite geometry, base position quality, baseline length, radio communication, atmospheric conditions, multipath and nearby obstructions.

Calibration-free IMU tilt measurement

The L300 includes a nine-axis IMU that supports calibration-free tilt compensation up to 60°. During rover measurements, the survey pole does not have to remain perfectly vertical. The operator can place the pole tip on the required point while holding the receiver at an angle.

This makes it easier to measure points beside buildings, fences, vehicles, stored materials and site machinery. It is also helpful at excavation edges, against kerbs and on uneven ground where carefully levelling the pole would otherwise slow down the work.

Integrated UHF radio for local RTK corrections

The integrated 410–470 MHz UHF radio can transmit and receive RTK corrections. In this set, the base receiver transmits correction data while the rover receives it. Radio frequencies, protocols, channels and power settings can be configured to suit the project and compatible equipment.

The receiver manual specifies selectable 1 W and 2 W transmission power and a working range greater than 4 km under appropriate conditions. Practical range varies with terrain, antenna height, buildings, vegetation, interference, radio configuration and local regulations. Raising the base receiver and maintaining a clear path between the base and rover can improve communication reliability.

Network RTK remains available

Although this package is designed for local base-and-rover operation, each L300 also includes an integrated 4G modem. The rover can therefore connect to an NTRIP or CORS service when a suitable mobile network and correction subscription are available. This gives the team the choice between using its own base or working through an established correction network.

The receiver can also be configured to transmit corrections through an internet connection. Available operating options include internal UHF, network communication, NTRIP client, NTRIP server and NTRIP caster workflows.

S50III controller with SurPro software

The included a-GEO S50III data collector provides a dedicated Android controller for configuring the rover and completing survey tasks. It mounts to the supplied survey pole using the controller bracket, keeping receiver status, mapping information and measurement controls within reach while moving around the site.

SurPro software supports common GNSS field operations such as project creation, coordinate-system configuration, point measurement, line and point stakeout and field data management. This allows operators to collect coordinates, navigate to design positions and review survey information directly in the field.

Static observations and post-processing

The L300 is not limited to real-time rover measurements. It can also record raw GNSS observations for static surveys and post-processed workflows. This is useful when establishing control, checking reference coordinates or collecting data in locations where a stable real-time correction link cannot be maintained.

Its internal storage supports commonly used GNSS data and correction formats, including RTCM, RINEX and NMEA. Survey files can be managed through USB Type-C or the receiver’s browser-based Web UI.

Web-based receiver configuration

Each receiver can create a Wi-Fi hotspot that provides access to its Web UI through a phone, tablet or computer. From the interface, users can review satellite and receiver status, choose a base or rover operating mode, configure the UHF radio, enter network settings and manage recorded data.

This browser-based approach allows many receiver settings to be changed without installing a separate desktop configuration application.

Rugged receivers for regular site use

The a-GEO L300 uses a magnesium-alloy housing and has an IP67 environmental rating. It is documented as dustproof and protected against temporary immersion to a depth of one metre for up to 30 minutes. The receiver is also specified to survive a two-metre pole drop onto concrete, although careful handling remains important for any precision surveying instrument.

Each receiver has an internal 6800 mAh lithium-ion battery with USB Type-C charging. Published operating time is up to 12 hours in rover mode, approximately 7 hours in base mode and up to 15 hours in static mode. Battery life in practice depends on radio output, mobile-network use, temperature, receiver settings and battery condition.

Typical applications

• Construction point, line and level stakeout
• Topographic and detail surveying
• Road, utility and civil engineering measurement
• Earthworks, excavation and machine-control reference surveys
• Site control and coordinate checks
• As-built surveys and project documentation
• Accurate GIS and infrastructure asset collection

Choosing and configuring the set

Reliable base-and-rover results require the base receiver to be installed over a stable point and configured with suitable coordinates. An incorrect base coordinate will be transferred to every rover measurement, even when the rover reports a fixed RTK solution. Projects tied to an official coordinate reference system may therefore require a surveyed control point or an appropriate site calibration.

Global GPS Systems can help confirm the correct radio settings, coordinate-system workflow, controller configuration and accessories for the intended construction, surveying or GIS application. The controller, field software and selected accessories can also be adapted where a project requires a different setup.