Spherefix SP35 RTK GNSS Receiver with Laser and AR Stakeout

Flexible RTK Surveying Beyond the Pole Tip

The Spherefix SP35 RTK GNSS receiver is built for field teams that need accurate positioning without being limited to points that can be occupied directly with a survey pole. It brings together multi-frequency GNSS tracking, IMU tilt compensation, AR stakeout and camera-assisted laser measurement in a compact receiver weighing no more than 780 g.

This combination makes the SP35 suitable for cadastral and topographic surveying, construction setting out, utility work, GIS asset collection, earthworks, site verification and general engineering measurement. It can also support drone teams that need accurately surveyed ground control points or checkpoints for mapping projects.

Camera-Assisted Laser Measurement

The integrated laser module allows an operator to collect a point without placing the pole directly on it. This is useful when measuring building corners, façades, trenches, stockpiles, walls, road edges, fenced areas or other locations that are obstructed, unstable or unsafe to approach.

A dedicated aiming camera helps the operator identify the intended point while the receiver combines laser distance information with GNSS and inertial measurements. For laser tilt surveying within a distance of 5 metres, the published three-dimensional error is no more than 2.5 cm. This capability can reduce the need for improvised pole positions and make difficult point collection more practical in everyday fieldwork.

Visual AR Stakeout Guidance

Traditional stakeout often requires the user to follow directional arrows and distance values while repeatedly checking the controller. The SP35 adds an ultra-wide-angle AR camera that displays the real working environment and guides the user towards the target point visually.

This real-scene guidance can make construction layout and point finding easier to understand, particularly for less experienced operators or on busy sites where orientation is difficult. Once the user approaches the target, standard RTK values can be used to complete the final positioning accurately.

Measure Accurately with a Tilted Pole

The tightly coupled IMU enables tilt-compensated surveying with positioning accuracy below 2 cm within a tilt range of up to 60°. The pole therefore does not need to remain perfectly vertical for every observation.

In practical use, this helps when collecting points beside walls, underneath vegetation, near parked machinery or on sloping and uneven ground. It can also speed up routine point collection by reducing the time spent centring the bubble. The inertial system is designed to operate without relying on a magnetic compass, which helps avoid disruption from nearby metal objects or electrical equipment.

Multi-Constellation GNSS Tracking

The SP35 uses 1,408 channels to track GPS, GLONASS, BeiDou, Galileo, QZSS, SBAS and NavIC signals. Support for multiple constellations and frequencies gives the receiver access to a broad satellite pool, helping it maintain an effective satellite geometry as field conditions change.

The receiver provides RTK accuracy of ±(8 mm + 1 ppm) horizontally and ±(15 mm + 1 ppm) vertically under suitable operating conditions. Static surveying is also supported for control work and projects where observations will be processed separately. A maximum data update rate of 20 Hz allows the receiver to respond quickly while the surveyor is moving or setting out points.

Rover Base and Static Workflows

The SP35 can be configured for rover, base or static operation. As a network rover, it can receive corrections through its integrated mobile data connection. For local base and rover work, the built-in 410–470 MHz radio supports selectable 0.5 W and 1.5 W transmission power and commonly used radio protocols.

Bluetooth, Wi-Fi and NFC provide additional connection options for controllers, configuration and field software. The receiver also supports common GNSS data formats, helping it fit into established surveying workflows and data-processing procedures.

Designed for Full Days Outdoors

A 7.4 V 6500 mAh internal battery provides more than 16 hours of typical operation when the receiver is used as a GSM rover. This is intended to cover a normal field day without frequent battery changes or interruptions for charging.

The magnesium-alloy housing combines a low carrying weight with protection for demanding outdoor work. The receiver is IP68 rated, resistant to a two-metre pole drop at room temperature and specified for operation from −30°C to +65°C. These characteristics make it suitable for construction sites, wet ground, dusty environments and changing seasonal conditions.

Who Uses the Spherefix SP35

Professional surveyors can use the SP35 for control, detail surveys, boundary work, stakeout and difficult-point measurement. Construction teams can use it to position foundations, utilities, kerbs, roads and other design features. Civil engineers and site managers can collect or verify coordinates during inspections and progress checks.

GIS crews can capture assets such as chambers, signs, poles, drainage features and utility infrastructure. Drone mapping professionals can use the receiver to survey ground control points and independent checkpoints. The visual workflow and tilt compensation also make accurate GNSS measurement more accessible to construction workers who do not use surveying equipment every day.

Choosing and Supporting Your SP35 System

The most suitable SP35 configuration depends on how corrections will be received, which field software is required and whether the receiver will be used as a rover, local base or both. Radio frequencies, network compatibility, coordinate systems and accessory requirements should be checked before deployment.

Global GPS Systems can help buyers select a compatible controller, survey pole, radio configuration and software setup for their intended work. Practical product support is also available for system configuration, field workflows and integrating the receiver into an existing GNSS equipment fleet.