Alpha 5i RTK GNSS Receiver with IMU Tilt

The Alpha 5i is a professional multi-frequency RTK GNSS receiver designed for high-precision positioning, surveying, mapping and construction work. It combines multi-constellation satellite tracking, IMU tilt compensation, 4G connectivity and a built-in UHF radio in one compact receiver.

The Alpha 5i is intended for land surveyors, construction professionals, civil engineers, mapping specialists, utility crews, GIS teams and other users who need centimetre-level positioning in the field.

The receiver can be used for topographic surveys, cadastral measurements, construction layout, point staking, as-built surveys, road and infrastructure projects, earthworks, utility mapping, GIS data collection and other high-accuracy positioning tasks.

Yes. The Alpha 5i can operate as an RTK rover and receive correction data through its built-in UHF radio or an internet-based correction service using its 4G modem. A compatible controller and field software are required to manage measurements and survey data.

Yes. Its integrated UHF transceiver supports both receiving and transmitting, allowing the receiver to be configured for compatible base-and-rover workflows. The required configuration, radio settings and accessories depend on the survey setup.

Yes. Its fast RTK fixing, integrated communications and tilt-compensated measurements are designed to support efficient single-operator fieldwork. Actual productivity depends on satellite visibility, correction availability, field software and site conditions.

The specified RTK accuracy is ±(8 + 1 ppm) mm horizontally and ±(15 + 1 ppm) mm vertically under suitable operating conditions. The product is designed to support approximately 2 cm field measurements, although actual accuracy depends on correction quality, satellite geometry, multipath, baseline length and environmental conditions.

The Alpha 5i is designed to reach a fixed RTK solution in approximately two seconds when correction data, satellite coverage and operating conditions are suitable. Fixing time may be longer near buildings, trees or other signal obstructions.

The receiver supports signals from GPS, GLONASS, Galileo, BeiDou, QZSS and SBAS. Using several constellations and frequencies improves satellite availability and helps maintain positioning performance in challenging environments.

The Alpha 5i has 1,116 GNSS channels for tracking multiple frequencies and satellite constellations simultaneously.

IMU tilt compensation combines GNSS positioning with inertial sensors so the survey pole does not need to be held perfectly vertical for every measurement. This can make it easier to measure building corners, hidden points, hazardous locations and other positions that are difficult to occupy with a level pole.

The Alpha 5i is designed to provide centimetre-level tilt-compensated measurements with the pole tilted by up to approximately 60 degrees. Measurement quality still depends on correct calibration, satellite conditions and the surrounding environment.

The tilt system may require initialization or calibration before use, depending on the field software and current operating state. Users should follow the on-screen procedure and verify the pole height and solution status before recording important points.

Yes. It has an integrated 1 W/2 W UHF transceiver operating in the 410–470 MHz range. It can receive or transmit compatible RTK correction data without requiring a separate external radio for many configurations.

The specified radio range is up to 16 km under favourable open-sky and line-of-sight conditions. Terrain, vegetation, buildings, interference, antenna setup, radio power and local regulations can significantly reduce the practical range.

Yes. Its integrated 4G LTE modem can be used with compatible field software to connect to an NTRIP or CORS correction service. A suitable SIM card, mobile data connection, account credentials and available network coverage are required.

Centimetre-level real-time accuracy requires correction data from a compatible base station or RTK network. Without corrections, the receiver can still calculate a GNSS position, but it will not normally provide the same RTK-level accuracy.

Yes. Bluetooth 5.0 is available for connecting the receiver to a compatible survey controller or other supported device.

The receiver is commonly paired with the Alpha Bi controller and DiMap field software. DiMap supports RTK survey workflows, project management, point collection, stakeout and field data review. Compatibility with other controllers or software should be confirmed before purchase.

Yes. The receiver supports GNSS data recording and RINEX output, allowing recorded observations to be used in compatible post-processing workflows.

The receiver is specified for up to 25 hours of operation. Actual working time varies with radio transmission power, 4G use, Bluetooth activity, temperature, battery condition and other operating settings.

Yes. The Alpha 5i has an IP67 protection rating, making it resistant to dust and temporary water immersion under the conditions defined by the rating. Connector covers should remain properly closed during field use.

The receiver is specified to survive a 2 m pole drop onto concrete and a 1.2 m free drop. It is designed for professional outdoor use, but normal care should still be taken to protect the antenna, connectors and housing.

The specified operating temperature range is -30°C to +70°C, while the storage temperature range is -40°C to +80°C. Battery performance and charging behaviour may be affected at extreme temperatures.

The Alpha 5i receiver weighs approximately 780 g and measures about 138 mm by 68 mm, providing a relatively compact setup for pole-mounted field measurements.

The standard receiver package is listed with the GNSS receiver, receiver charger, power cable, UHF antenna and carrying case. A controller, controller bracket, controller charger, additional power cable and GNSS pole may be optional or supplied only with selected configurations, so the exact package contents should be confirmed before ordering.

Yes. Permitted UHF frequencies, transmission power and licensing requirements differ by country or region. The receiver must be configured to use locally authorised frequencies, and the operator is responsible for complying with applicable radio regulations.