EMLID REACH RS4 Pro

Emlid Reach RS4 Pro is an all-band, multi-frequency RTK GNSS receiver with an integrated dual Full HD camera, designed to take topographic surveying, stakeout, and remote point measurement to the next level in terms of speed, safety, and accuracy. Based on the RS4 platform, it adds augmented reality (AR) and image-based measurement functions, while maintaining the same IP68 robustness, up to 16 hours of battery life, and centimeter-level accuracy in all conditions, even under canopy or in urban canyons.

Product Overview

Reach RS4 Pro is an all-band RTK GNSS receiver capable of tracking major constellations (GPS, GLONASS, Galileo, BeiDou, QZSS, NavIC) on L1, L2, L5, and L6 bands with 672 dedicated channels, ensuring FIX in under 5 seconds. The advanced GNSS engine, combined with high-performance antennas and advanced L5/L6 band management, ensures RTK solution stability even in the presence of multipath, obstacles, and disturbed signals.

Compared to Reach RS4, the Pro version integrates two factory-calibrated Full HD cameras with global shutters, allowing for AR stakeout directly on the real image and the measurement of inaccessible points from photos. This enables the surveying of elements on facades, infrastructure, or dangerous areas without having to position the pole in situ, improving operational safety and field productivity.

Usage and Applications

Reach RS4 Pro is designed for high-precision topographic surveys, large GIS projects, precision agriculture, and civil engineering applications where operational speed and visual documentation are crucial. The combination of all-band RTK, advanced TILT, and AR allows for tracking complex points, lines, and designs directly in the field, reducing interpretation errors compared to purely numerical methods.

In conjunction with Emlid Flow, the system manages AR-guided stakeout, image acquisition, and classic GIS/construction site workflows, with export to industry standard formats. RS4 Pro can also operate as an NTRIP rover, RTK base, or integration node for external systems (autopilots, agricultural machinery, GPR, monitoring systems), thanks to its radio, LTE, Wi-Fi, Bluetooth connectivity, and physical I/O.

Key Technical Specifications

Vision and AR

• Image sensors: 1/2.6", CMOS, global shutter, Full HD.
• Field of view:

1. Front camera: H 64.6°, V 42.8°.
2. Bottom camera: H 63°, V 42°.

• Video frame rate: 25 fps.
• Key functions:

1. AR stakeout with augmented reality project visualization.
2. Image-based measurement for remote or inaccessible points.

GNSS and Performance

• Supported bands: L1, L2, L5, L6 (all-band).
• Constellations: GPS, GLONASS, Galileo, BeiDou, QZSS, NavIC.
• Number of channels: 672.
• FIX time: ~5 s typical in RTK.
• Update rate: up to 10 Hz.

TILT and Sensors

• Tilt compensation: based on a new-generation IMU, with rapid initialization and operation without the need for field calibration.
• RTK accuracy with TILT: precision specifications in the order of a few millimeters + ppm (e.g., 7 mm + 1 ppm in horizontal RTK, according to partner reference data).

Mechanics and Robustness

• Dimensions: 128.6 × 128.6 × 99.3 mm.
• Weight: approximately 920 g.
• Protection class: IP68, resistant to dust and water immersion.
• Operating temperatures: from −40 °C to +65 °C.
• Structure: robust housing with engineering identical to the RS4 platform, optimized for intensive use on construction sites and in agricultural environments.
• Quick-release mount: quick attachment for pole with 5/8" thread, compatible with the new Emlid quick-release system.

Power and Battery Life

• Battery life: up to 16 hours of continuous operation as an RTK rover with active tilt.
• Battery: high-capacity internal industrial battery, with optimized power management for extended sessions.
• Charging: via USB Type-C port; compatible with power banks for multi-day work.

Connectivity and Data

• LoRa Radio:

1. Frequency: 868/915 MHz (compatible with included 860–930 MHz antenna).
2. Power: up to 0.1–1 W.
3. Range: up to ~8 km in optimal conditions.

• UHF Radio:

1. Frequency: 410–470 MHz.
2. Power: up to 2 W.

• Protocols: TRIMTALK 450S** support for integration with professional radio bases.
• GNSS/RTK:

1. Corrections: RTCM3 via NTRIP or radio.
2. Modes: RTK rover, RTK base, PPK operations.

• Data Communications:

1. Multi-band LTE/4G with nano-SIM slot for direct NTRIP connectivity.
2. Wi-Fi 802.11 a/b/g/n.
3. Bluetooth 5.1 (BR/EDR + BLE) for connection to controllers and external systems.
4. USB Type-C for power and data exchange.

• Logging: recording of raw data for post-processing (RINEX and other supported formats) on internal memory.

Emlid Reach RS4 Pro Technical Specifications Table