Alpha Surveying

Alpha 4AR RTK - GNSS Receiver

$3,164.75

Contact us for the best deal on this product.


The Alpha 4AR RTK - GNSS receiver comes with an ultra-compact design, excellent precision positioning, and durability so advanced that you can use it in any type of terrains. It is aimed at users that seek an ultimate surveying experience.

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Product Information

Professional RTK GNSS Receiver for Precision Surveying

The Alpha 4i RTK delivers centimeter-level accuracy in an ultra-compact form factor, engineered for surveying professionals who demand reliable positioning across diverse terrain conditions.


Advanced Positioning Technology

Built around the powerful NebulasIV SoC chip, the Alpha 4i processes signals from all major satellite constellations simultaneously. The all-frequency antenna design ensures consistent performance whether you're working in urban canyons, dense forests, or open terrain, delivering the accuracy you need for critical measurements.

Built for Field Conditions

Every component is engineered to withstand the demands of professional fieldwork. The rugged housing protects against dust, moisture, and impact while maintaining the lightweight portability that keeps you productive throughout long survey sessions.


Key Advantages

  • Ultra-compact design reduces equipment load without compromising performance
  • Multi-constellation tracking ensures reliable positioning in any environment
  • Fast initialization times minimize setup delays and maximize productivity
  • Weather-sealed construction maintains accuracy in harsh field conditions

Channels: 1408

GNSS Support: GPS, GLONASS, Galileo, BDS, QZSS, SBAS, NAVIC

RTK Accuracy:

  • Horizontal: ±(8+1×10⁻⁶×D) mm
  • Vertical: ±(15+1×10⁻⁶×D) mm

Tilt Compensation: 0-90°, Update Rate: 100Hz

Operating System: RTOS

Bluetooth: BT5.0 (backward compatible)

Frequency Range: 410-470MHz

Water/Dust Resistance: IP67

Operating Temperature: -30°C to +70°C

Weight: 830g

Features :

Ultra-Compact Design
Weighs only 830g for effortless transport and extended field use
Advanced NebulasIV SoC Chip
Delivers rapid fixed solutions and superior signal processing
90° Tilt Compensation
Built-in IMU provides 2cm accuracy even at extreme angles
Full-Constellation Support
Tracks GPS, GLONASS, BeiDou, Galileo, and QZSS simultaneously
Integrated UHF Radio
3km range RTK corrections with industry-standard protocol support
IP67 Rugged Construction
Weatherproof design withstands harsh field conditions
8cm Full-Frequency Antenna
Optimized for maximum signal reception and positioning accuracy
Extended Battery Life
Up to 12 hours continuous operation for all-day productivity
Download Center
Reviews :
4.8/5
★★★★★
Based on verified reviews
★★★★★
Michael Rodriguez
Senior Land Surveyor · Verified Purchase
Exceptional precision and reliability in challenging terrain
The Alpha 4i RTK has exceeded expectations on multiple large-scale cadastral projects. The ultra-compact design doesn't compromise on accuracy, consistently delivering centimeter-level precision even in heavily forested areas. Build quality is outstanding and has withstood extreme weather conditions without any performance degradation.
★★★★★
Sarah Chen
GIS Specialist · Verified Purchase
Outstanding RTK performance with fast initialization
Impressed with the rapid RTK fix acquisition times and consistent signal tracking capabilities. The compact form factor makes it ideal for UAV integration and mobile mapping applications. Data collection efficiency has improved significantly since implementing this receiver in our workflow.
★★★★☆
David Thompson
Construction Project Manager · Verified Purchase
Robust construction-grade performance
The Alpha 4i RTK has proven invaluable for precision construction layout and machine control applications. Durability is exceptional, surviving drops and harsh job site conditions without issues. Battery life could be improved for all-day operations, but overall performance justifies the investment.
★★★★★
Amanda Foster
Geomatics Engineer · Verified Purchase
Professional-grade accuracy with user-friendly operation
This receiver delivers consistent sub-centimeter accuracy across various GNSS constellations and environments. The intuitive interface and seamless integration with existing survey software streamlined our field operations. Alpha Surveying's technical support has been exemplary throughout the implementation process.
★★★★★
James Mitchell
Principal Surveyor · Verified Purchase
Superior multi-constellation tracking capabilities
The Alpha 4i RTK's advanced tracking algorithms provide remarkable performance in challenging signal environments. Urban canyon work and dense canopy surveys that previously required multiple setups now complete efficiently with this receiver. The investment has significantly improved our operational productivity and measurement confidence.

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)
  • 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 RTK receiver?
The Alpha 4i RTK delivers centimeter-level precision positioning under optimal conditions. RTK technology provides horizontal accuracy of ±8mm + 1ppm and vertical accuracy of ±15mm + 1ppm when receiving quality RTK corrections, making it suitable for high-precision surveying applications.
Is the Alpha 4i suitable for harsh environmental conditions?
Yes, the Alpha 4i RTK is engineered for durability across various terrain types and environmental conditions. Its rugged construction meets industry standards for dust and water resistance, allowing reliable operation in challenging field conditions including extreme temperatures and weather exposure.
What GNSS constellations does the Alpha 4i track?
The Alpha 4i RTK supports multi-constellation tracking including GPS, GLONASS, Galileo, and BeiDou systems. This comprehensive constellation support ensures optimal satellite availability and positioning reliability even in challenging environments with limited sky visibility.
How does the ultra-compact design benefit field operations?
The ultra-compact form factor reduces operator fatigue during extended field sessions while maintaining full GNSS functionality. The lightweight design enhances portability and ease of setup, making it ideal for rapid deployment across multiple survey points and extended surveying campaigns.
What RTK correction methods are supported?
The Alpha 4i RTK supports multiple correction delivery methods including cellular networks, radio modems, and internet-based correction services. It is compatible with standard RTK protocols and can receive corrections via RTCM formats, ensuring flexibility in various surveying scenarios and geographic locations.

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.

If a quotation, proforma invoice or written sales confirmation contains shipping terms that differ from this Policy, the terms in that document will control. Nothing in this Policy limits any mandatory rights available to a Consumer under applicable law.

1. Order acknowledgement and acceptance

An automated order confirmation only confirms that we have received the order. It does not constitute final acceptance of the order or confirmation of product availability.

An order is accepted when Metricop sends a written order acceptance or dispatch confirmation, or otherwise expressly confirms acceptance in writing.

Before acceptance, we may verify:

  • product availability;

  • price and specification accuracy;

  • payment status;

  • shipping address;

  • export or import restrictions;

  • compatibility or configuration information; and

  • suspected fraud or payment risk.

If we cannot accept an order, any payment already received will be returned using the original payment method.

2. Availability and shipping origin

Products may be dispatched from Metricop stock, a logistics partner, an authorised supplier or a manufacturer warehouse. The shipping country may therefore differ from Metricop’s registered business address.

Orders containing several products may be shipped in separate packages and may arrive on different dates.

Stock information is based on the information reasonably available when the order is placed and may change before final order acceptance. Products described as available, in stock or supplier stock are subject to final verification.

3. Processing and delivery estimates

Any processing, dispatch, transit or delivery time displayed on the website, quotation, invoice, order confirmation or tracking page is a good-faith estimate only, unless Metricop expressly confirms a guaranteed date in writing.

Where the website states “Estimated delivery: 4–7 business days,” this means the typical estimated delivery period for eligible in-stock orders after payment and order verification. It is not a guaranteed arrival date.

Delivery estimates may be affected by:

  • stock or supplier availability;

  • technical configuration or testing;

  • calibration or certification;

  • payment verification;

  • customer response time;

  • export documentation;

  • destination and remote-area service;

  • carrier capacity;

  • customs clearance;

  • import inspections;

  • public holidays, weather or other events outside our reasonable control.

Business days exclude weekends and public holidays applicable at the dispatch location, carrier hubs or destination.

If delivery by a particular date is essential, the Buyer must contact Metricop before placing or paying for the order. A requested date, project deadline or “required delivery” field does not become binding unless Metricop expressly accepts it in writing as a guaranteed delivery date.

If a material delay occurs, we will provide an updated estimate and any cancellation or refund options required by applicable law.

4. Shipping methods and charges

Shipping methods and charges depend on the product, destination, value, dimensions and required service.

Where “free shipping” or “shipping included” is stated, it covers only the standard transportation service expressly included in the order. Unless stated otherwise, it does not include:

  • customs duties, import VAT or local taxes;

  • brokerage or clearance fees;

  • remote-area or address-correction surcharges;

  • storage, demurrage or redelivery charges;

  • special permits or inspections;

  • return transportation; or

  • cargo insurance exceeding the carrier’s standard liability.

If an additional shipping charge becomes necessary before dispatch, we will request the Buyer’s approval. The order will not be dispatched with an unapproved material additional charge.

5. Customs, duties and importer responsibilities

Unless an order is expressly confirmed as DDP – Delivered Duty Paid, the recipient is responsible for customs clearance, import duties, VAT, taxes, brokerage charges and other destination-country costs.

The recipient may be treated as the importer of record and is responsible for providing accurate identification, tax numbers, permits and other information requested by customs authorities or the carrier.

Customs clearance time is outside Metricop’s direct control and is not included in any estimated delivery period unless expressly stated.

Metricop will not declare an incorrect value, description or country of origin or identify commercial goods as gifts.

6. Shipping addresses and delivery attempts

The Buyer is responsible for providing a complete and accurate delivery address, contact person, telephone number and any required customs information.

A request to change the address after order acceptance may result in delay, additional charges or cancellation if the shipment can no longer be redirected safely.

Delivery may require a signature. Delivery to the address, reception desk, mailroom, site office or person reasonably appearing authorised to receive the shipment will normally constitute delivery.

7. Risk of loss

For Consumers, risk of loss remains with Metricop until the Consumer or a person designated by the Consumer takes physical possession of the goods, where required by applicable law.

For Business Customers, the Incoterm stated in the quotation or invoice controls. If no different Incoterm is stated and Metricop arranges and prepays transportation, the order is shipped CPT Buyer’s delivery address, Incoterms® 2020. Risk passes to the Business Customer when the goods are handed to the first carrier, even though Metricop pays transportation to the stated destination.

Unless expressly included, cargo insurance beyond the carrier’s standard liability is not provided. Business Customers may request additional cargo insurance before order acceptance.

8. Inspection and transit damage

The recipient should inspect the shipment immediately upon delivery.

Visible external damage, missing packages or suspected tampering should be noted on the carrier’s delivery record. Photographs of the package, labels, contents and serial numbers should be taken before packaging is discarded.

Business Customers must notify Metricop of visible shipping damage, shortages or an incorrect product within five business days after delivery. Notification should include:

  • order or invoice number;

  • tracking number;

  • description of the issue;

  • photographs or video;

  • product and package labels; and

  • applicable serial numbers.

Failure to notify us promptly may prevent recovery from the carrier and may affect a Business Customer’s claim to the extent permitted by law. This does not limit non-waivable Consumer rights.

The recipient must retain all original packaging until Metricop confirms that it may be discarded.

9. Delayed, lost or misrouted shipments

Tracking information and carrier estimates are not guarantees.

If a shipment appears lost or materially delayed, please contact Metricop so that we can open a carrier investigation. Carrier investigations may require information or documents from the recipient.

For Business Orders where risk has already passed to the Buyer, Metricop’s assistance with a carrier claim does not mean that Metricop has reassumed the risk of loss.

10. Refused and undeliverable shipments

A Business Customer’s refusal to accept a conforming shipment, failure to provide customs information or failure to pay import charges does not constitute an authorised cancellation.

Actual return freight, storage, customs, brokerage, redelivery and other non-recoverable costs may be deducted from any amount otherwise refundable to a Business Customer.

Consumer rights regarding refused or undelivered shipments remain subject to applicable mandatory law.

11. Events outside our reasonable control

Metricop is not responsible for delays caused by events outside its reasonable control, including carrier disruption, customs action, export restriction, government order, labour dispute, natural disaster, severe weather, war, civil disturbance, epidemic, cyber incident, supplier interruption or infrastructure failure.

For Business Customers, Metricop is not liable for project delay, downtime, lost profit, substitute-equipment costs or other indirect or consequential loss resulting from a delivery delay, except where liability cannot lawfully be excluded.

12. Contact

Questions regarding shipping should be sent to:

Surveying Equipment Metricop LLC
30 North Gould Street
Sheridan, WY 82801, USA
Email: sales@metricop.com