CHCNAV i76 GPS RTK Visual IMU GNSS Receiver User Manual

1. Introduction

The CHCNAV i76 is an efficient, palm-sized visual IMU-RTK GNSS receiver designed for high-precision surveying and engineering applications. This international version offers advanced satellite tracking, visual stakeout capabilities with Augmented Reality (AR), and robust physical characteristics suitable for harsh environments. This manual provides essential information for setting up, operating, maintaining, and troubleshooting your i76 receiver.

2. Package Contents

Upon receiving your CHCNAV i76, please verify that all components are present and in good condition. The standard package typically includes:

• CHCNAV i76 GNSS Receiver Unit
• HCE600 Android Controller (or similar compatible controller)
• Carrying Case
• Charging Cables and Adapters
• Antenna (for radio communication)
• Mounting Bracket for Controller
• USB Flash Drive/TF Card (for external storage, if included)

3. Setup Guide

3.1 Initial Charging

Before first use, fully charge the i76 receiver and the HCE600 controller. The i76 receiver supports fast charging (up to 24W) and can be charged via a DC 5-12V external power supply, including power banks. A full charge typically takes less than 4 hours.

3.2 Powering On/Off

• Power On: Press and hold the single power button on the i76 receiver until the LED indicators illuminate.
• Power Off: Press and hold the power button until the device powers down.

3.3 Controller Setup (HCE600)

The HCE600 controller runs on Android 10. Follow the on-screen prompts for initial setup, including language selection and network configuration. Ensure the controller's battery is also charged for optimal performance.

3.4 Connecting Receiver and Controller

The i76 receiver and HCE600 controller can be connected via Wi-Fi, Bluetooth, or 4G network modules.

• Bluetooth Pairing: Enable Bluetooth on both devices. On the controller, search for available devices and select the i76. Confirm the pairing code if prompted. The i76 supports Bluetooth 5.0 & 4.2+EDR.
• Wi-Fi Connection: The i76 supports Wi-Fi data link (IEEE 802.11a/b/g/n/ac). Connect the controller to the i76's Wi-Fi hotspot or configure both devices to connect to a common Wi-Fi network.
• NFC Touch Pairing: For quick pairing, the i76 supports NFC for device touch pairing. Simply tap the NFC-enabled controller to the designated NFC area on the i76 receiver to initiate a connection.
• 4G Network: Both the i76 and HCE600 controller support 4G network modules for data communication, enabling robust connectivity in the field.

3.5 Antenna Installation

Attach the provided antenna to the designated port on the i76 receiver for radio communication, if required for your surveying method (e.g., UHF RTK).

4. Operating Instructions

4.1 GNSS Performance and Accuracy

The i76 receiver tracks 1408 channels and supports multiple satellite systems including GPS, BDS (B1I, B2I, B3I, B1C, B2a, B2b*), GLONASS (L1, L2, L3*), Galileo (E1, E5a, E5b, E6*), QZSS (L1C/A, L1C, L2C, L5), SBAS (L1, L5*), and NavIC/IRNSS (L5). It boasts an initial reliability of 99.99%.

The device provides high accuracy for various surveying modes:

• High-precision static: Horizontal: ±(2.5 + 0.1×10-6×D)mm, Altitude: ±(3.5 + 0.4×10-6×D)mm
• Static and Fast Static: Horizontal: ±(2.5 + 0.5×10-6×D)mm, Altitude: ±(5 + 0.5×10-6×D)mm
• RTK Accuracy: Horizontal: ±(8 + 1×10-6×D)mm, Altitude: ±(15mm + 1×10-6×D)mm
• Tilt Measurement Accuracy: 8mm + 0.3 mm/° tilt (Accuracy <2cm within 30°)
• Visual Layout Accuracy: Horizontal: ±(8 + 1×10-6×D)mm, Altitude: ±(15 + 1×10-6×D)mm

4.2 IMU Functionality

The i76 integrates a 200Hz IMU with a tilt range of 0-60°. It features 5th generation Ultra IMU technology, providing automatic inertial initialization and reliable accuracy, enhancing efficiency in challenging environments.

4.3 Visual Features and AR Stakeout

Equipped with dual 2MP wide-angle cameras (95°±3° field of view, F2.4 aperture, 30fps), the i76 enables real-time AR image viewing and CAD AR full map real scene layout. This significantly increases stakeout efficiency, particularly for applications like pipelines, landscape, foundation construction, and routes.

4.4 Data Output and Communication

The i76 supports various data output formats:

• Differential Data: RTCM2.X, RTCM3.X, CMR, CHC516
• Positioning Data: NMEA-0183
• Static Data: HCN, RINEX 2.11, RINEX 3.02

Communication is facilitated through Wi-Fi (IEEE 802.11a/b/g/n/ac), Bluetooth (5.0 & 4.2+EDR), and a 4G network module. It also includes a built-in single receiver radio supporting Huace/TT450/transparent transmission protocols, compatible with mainstream radio protocols.

4.5 User Interface

The i76 features linkage dual LED signal lights (differential data light + power light) and a single button for user interaction. A web interface is available for both PC and mobile devices for configuration and monitoring.

5. Maintenance and Care

5.1 Environmental Considerations

The i76 is built with a magnesium alloy body and designed for durability:

• Operating Temperature: -45℃ to +75℃
• Storage Temperature: -55℃ to +85℃
• Waterproof and Dustproof: IP68 rated (resistant to immersion in 1 meter of water for 30 minutes).
• Anti-collision: IK08 rated (withstands mechanical impact equivalent to a 2.5-kilogram steel hammer without damage, and withstands a 3-meter drop).
• Waterproof Breathable Membrane: Prevents water vapor from entering the device in harsh environments like sun exposure and sudden heavy rain.

Despite its robust design, avoid exposing the device to extreme conditions beyond its specified limits.

5.2 Battery Care

To maximize battery life and performance:

• Always use the provided charging cables and adapters.
• Avoid fully discharging the battery frequently.
• Store the device with a partial charge (around 50%) if not used for extended periods.
• The typical battery life for mobile stations is over 17 hours.

5.3 Storage

The i76 has 8GB of internal storage and supports external expansion up to 128GB via USB flash drive or TF card. Regularly back up important data to prevent loss.

5.4 Cleaning

Clean the device with a soft, damp cloth. Do not use harsh chemicals or abrasive materials that could damage the casing or screen.

6. Troubleshooting

This section addresses common issues you might encounter with your CHCNAV i76 receiver.

6.1 Device Not Powering On

• Check Battery: Ensure the battery is charged. Connect the charger and wait a few minutes before attempting to power on again.
• Power Button: Confirm you are pressing and holding the power button sufficiently.

6.2 No Satellite Signal

• Open Sky: Ensure the device has a clear, unobstructed view of the sky. Obstacles like tall buildings, dense foliage, or heavy overhead cover can block satellite signals.
• Antenna: Verify the antenna is securely connected (if applicable).
• Location: Move to an open area away from potential interference sources.

6.3 Connection Issues (Bluetooth/Wi-Fi)

• Enable Features: Ensure Bluetooth and/or Wi-Fi are enabled on both the i76 and the controller.
• Visibility: Make sure the i76 is discoverable during pairing.
• Restart Devices: Try restarting both the i76 receiver and the controller.
• Interference: Move away from other electronic devices that might cause wireless interference.

6.4 Inaccurate Readings

• Calibration: Ensure the IMU is properly initialized and calibrated according to the software instructions.
• RTK Correction: Verify that RTK corrections are being received and applied correctly. Check the status of your base station or network RTK service.
• Environment: Large metallic objects or strong electromagnetic fields can affect accuracy.

6.5 Controller Software Issues

• Restart Application: Close and reopen the surveying application on the HCE600 controller.
• Update Software: Ensure both the i76 firmware and the controller's surveying software are up to date.
• Factory Reset: As a last resort, consider a factory reset of the controller (back up data first).

7. Specifications

8. User Tips

No specific user tips were available from reviews or Q&A for this product. However, general best practices for GNSS receivers include:

• Always ensure the latest firmware is installed on your i76 receiver for optimal performance and access to new features.
• Regularly calibrate the IMU as recommended by the software to maintain tilt compensation accuracy.
• When working in areas with potential signal interference, consider using a base station setup for more reliable RTK corrections.
• Protect the camera lenses from scratches and dirt to ensure clear visual data for AR applications.

9. Warranty and Support

9.1 Warranty Information

All products come with a one-year warranty, ensuring quality and reliability. Please retain your purchase records for warranty claims.

9.2 Technical Support

For any technical assistance, questions, or support needs, please contact the seller directly:

• WhatsApp: +8617608479274
• Email: 1813402553@qq.com

The support team is available to assist with product inquiries, troubleshooting, and general guidance.