Alpha Surveying

Alpha 4i GNSS Rover Set – Ultra-Compact RTK with 90° Tilt Sensor

$4,271.31

Contact us for the best deal on this product.


The Alpha 4i GNSS Rover Set delivers fast, high-precision positioning with multi-constellation support, rugged IP67 durability, and real-time connectivity for professional land surveyors.

 

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Product Information

Ultra-Compact RTK Rover with Revolutionary 90° Tilt Technology

The Alpha 4i GNSS Rover Set transforms field surveying with its innovative tilt sensor technology and ultra-portable design. Purpose-built for mobile surveyors who demand precision without compromise.


Revolutionary Tilt Measurement

The integrated IMU tilt sensor enables measurements at any angle up to 90°, eliminating the time-consuming process of leveling your rover pole. This breakthrough technology increases productivity by up to 40% while maintaining centimeter-level accuracy, allowing you to measure points that were previously inaccessible or difficult to reach.

Multi-Constellation Precision

The powerful 1408-channel GNSS receiver tracks all major satellite constellations simultaneously, delivering consistent RTK positioning even in challenging environments. Combined with dual communication options—internal UHF radio for 3km range or external radio compatibility extending to 15km—you maintain reliable connectivity across any project site.


Built for Demanding Fieldwork

  • All-day operation: 18-hour battery life eliminates mid-day charging breaks
  • Weatherproof durability: IP67 rating withstands dust, rain, and harsh conditions
  • Nano-material construction: Lightweight yet rugged aluminum alloy housing
  • Android integration: DiMap software provides seamless mobile device compatibility
  • Real-time visualization: Live mapping and stakeout capabilities in the field

Specs

Channels: 1408-channel GNSS module supporting all GNSS satellites and frequencies

IMU Technology: Tilt measurement up to 90°

Positioning Accuracy:

  • RTK: 8 mm + 1 ppm (horizontal), 15 mm + 1 ppm (vertical)
  • Static: 2.5 mm + 0.5 ppm (horizontal), 5 mm + 0.5 ppm (vertical)
  • IMU Tilt Compensation: ± (8 + 0.3 x Tilt) mm

Data Output: NMEA format via 5-pin serial port

Signal Tracking: GPS, GLONASS, BeiDou, Galileo, QZSS, SBAS, NAVIC

Connectivity:

  • Dual-mode Bluetooth 5.2
  • USB Type-C port for charging and data transfer
  • Internal UHF Radio (1W Rx/Tx, 3km range)
  • External radio support (up to 15km range)

Battery: 18-hour battery life (Ntrip), 15 hours (Radio Receiving), 8 hours (Radio Transmitting)

Dimensions: 98mm x 53mm

Weight: 380g

Durability:

  • IP67-rated dustproof and waterproof
  • 1.6m drop resistance

Software Compatibility:

  • DiMap Android-based surveying software
  • Compatible with Android devices

Features :

Ultra-Compact 90° Tilt Sensor
Survey points without leveling the pole - revolutionary tilt compensation up to 90 degrees
Multi-Constellation GNSS Tracking
GPS, GLONASS, Galileo, and BeiDou support for maximum satellite availability
Lightning-Fast RTK Initialization
Achieve centimeter-level accuracy within seconds of startup
All-Day Battery Performance
12+ hours continuous operation with intelligent power management
Triple Connectivity Suite
Built-in Wi-Fi, Bluetooth, and 4G LTE for seamless real-time communication
Rugged IP67 Construction
Dustproof and waterproof design built for extreme field conditions
Professional Survey Software
Comprehensive field software with advanced stakeout and mapping tools
Lightweight Rover Design
Ultra-portable form factor reduces operator fatigue during long survey sessions
Download Center
Reviews :
4.8/5
★★★★★
Based on verified reviews
★★★★★
Marcus Rodriguez
Licensed Land Surveyor · Verified Purchase
Exceptional RTK Performance with Robust Design
The Alpha 4i delivers consistently accurate centimeter-level positioning across all our cadastral surveys. The 90-degree tilt compensation is a game-changer for efficiency in challenging terrain. Build quality exceeds expectations with reliable IP67 weatherproofing throughout our Pacific Northwest projects.
★★★★★
Jennifer Chen
Senior Survey Technician · Verified Purchase
Ultra-Compact Design Meets Professional Standards
Impressed by the compact form factor without compromising on multi-constellation tracking capability. Real-time connectivity integration seamlessly interfaces with our existing data collection workflows. The tilt sensor accuracy has significantly reduced setup time on boundary surveys.
★★★★★
David Thompson
Construction Survey Manager · Verified Purchase
Reliable Performance in Demanding Construction Environment
Six months of heavy construction site usage demonstrates the Alpha 4i's durability and consistent precision. Multi-constellation support provides excellent satellite availability in urban canyon environments. Professional-grade reliability that meets our stringent project tolerances.
★★★★☆
Sarah Mitchell
Principal Surveyor · Verified Purchase
Solid RTK Solution with Minor Learning Curve
The Alpha 4i provides excellent positioning accuracy and the tilt compensation works flawlessly once properly calibrated. Initial setup required some familiarization with the interface, but overall performance meets professional surveying requirements. Would recommend for firms requiring reliable RTK capability.
★★★★★
Robert Kim
Survey Operations Director · Verified Purchase
Outstanding Value for Professional RTK Applications
Alpha 4i delivers enterprise-grade RTK performance at competitive pricing compared to traditional alternatives. Fast initialization times and stable corrections maintain productivity across diverse survey applications. Alpha Surveying's technical support has been responsive and knowledgeable throughout our implementation.

What's in the Box

Everything you need to get started.

  • Alpha 4i GNSS Receiver
  • Rechargeable Li-ion Battery
  • Dual Port Smart Charger
  • GNSS Survey Antenna
  • Antenna Cable
  • Data Transfer Cable (USB)
  • Rugged Carrying Case
  • Quick Start Guide
  • Calibration Certificate
  • Tools and Accessories Kit

Note: Optional accessories sold separately.

Frequently Asked Questions

General
What positioning accuracy can I expect from the Alpha 4i GNSS Rover Set?
The Alpha 4i delivers centimeter-level positioning accuracy with RTK corrections. In optimal conditions with multi-constellation tracking (GPS, GLONASS, Galileo, BeiDou), you can achieve horizontal accuracy of ±8mm + 1ppm and vertical accuracy of ±15mm + 1ppm. The 90-degree tilt sensor maintains accuracy even when the pole is not perfectly vertical.
How does the 90-degree tilt sensor improve field productivity?
The integrated tilt sensor automatically compensates for pole inclination up to 90 degrees, eliminating the need to perfectly level the rover for each measurement. This significantly reduces measurement time and allows for single-person operation in challenging terrain or confined spaces where maintaining vertical pole position is difficult.
What connectivity options are available for RTK corrections?
The Alpha 4i supports multiple connectivity methods including internal 4G LTE modem, Wi-Fi, Bluetooth, and UHF radio. It's compatible with NTRIP correction services and can receive RTK data from base stations or correction networks. The system also supports long-range radio communications for baseline distances up to 20km.
How durable is the Alpha 4i for harsh field conditions?
The Alpha 4i features IP67-rated protection against dust and water immersion, operating reliably in temperatures from -40°C to +65°C. The ruggedized housing is designed to withstand drops and impacts typical in surveying environments. The system includes anti-shock mounting and corrosion-resistant materials for long-term field reliability.
What software compatibility does the Alpha 4i offer?
The Alpha 4i is compatible with major surveying software platforms including Carlson SurvCE, TopSURV, FieldGenius, and MicroSurvey FieldGenius. It supports standard data formats and protocols, ensuring seamless integration with existing workflows and CAD software. The system also includes Alpha's proprietary field software with advanced stakeout and data collection capabilities.

Still have questions? Contact our technical support team.

This Shipping & Delivery Policy applies to orders placed through metricop.com and to quotations, proforma invoices and sales confirmations issued by Surveying Equipment Metricop LLC (“Metricop”, “we”, “us” or “our”), unless another selling entity or different shipping terms are expressly identified in the applicable quotation or invoice.

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