Ebyte GNSS Module Selection Guide: Choose the Right Positioning Solution

Whether you are designing a sleek wearable asset tracker or upgrading heavy industrial machinery, choosing the right Global Navigation Satellite System (GNSS) module is crucial for your project's success.

This comprehensive selection guide breaks down Ebyte’s complete line of GNSS modules and terminals, helping you balance accuracy, power consumption, form factor, and cost.

1. Product Series Overview

1.1 Technical Positioning

Ebyte GNSS modules are embedded wireless communication products designed for IoT positioning workloads. Built on both leading domestic and international mainstream positioning chips, these modules support multi-satellite systems—including BDS-3 (BeiDou), GPS, GLONASS, Galileo, and QZSS—ensuring 24/7 all-weather location, velocity, and time tracking.

Ebyte’s product lineup spans from consumer-grade to industrial-grade applications, classified into three distinct physical form factors and three performance tiers:

• By Form Factor: Embedded SMD Modules, Integrated GMOUSE Terminals, and Industrial DIN-Rail Positioning Terminals.

• By Performance/Accuracy: Single-Frequency General Series, Pure BeiDou Domestic Series, and Dual-Frequency High-Performance Navigation Series.

1.2 Core Technical Features

• Multi-Constellation Joint Positioning: Mainstream models support simultaneous tracking of multiple systems (e.g., GPS + BeiDou + GLONASS). This offers higher accuracy, faster satellite fixes (TTFF) under partial blockage, and improved reliability compared to single-system positioning.

• Low-Power Energy Management: Supports multi-stage sleep modes (Standby, Sleep, Periodic Wake-up). Deep sleep current drops to microamp (µA) levels, making them ideal for battery-powered passive tracking and asset monitoring.

• High Sensitivity Reception: Equipped with built-in Low Noise Amplifiers (LNA) and advanced signal processing algorithms. Excellent capture and tracking sensitivities ensure stable fixes even in weak signal environments like urban canyons and dense foliage.

• Industrial-Grade Reliability: Operating temperatures range from -40°C to +85°C. Units include robust ESD protection and anti-electromagnetic interference capabilities, making them fully compliant with harsh industrial environments. Major high-volume models carry SRRC certification.

• Easy Integration & Development: Standard UART ports output NMEA-0183 protocol data, and parameters can be easily configured via standard AT commands. No complex low-level driver development is needed.

1.3 Typical Applications

• Automotive & Transportation: Fleet management, logistics vehicle tracking, ride-hailing location mapping, and construction machinery monitoring.

• Smart Municipalities: Smart street light positioning, manhole cover tracking, sanitation vehicle routing, and municipal utility inspections.

• Smart Agriculture: Autonomous tractor guidance, environmental monitoring node location, and livestock asset tracking.

• Industrial IoT (IIoT): Industrial equipment tracking, port shipyard asset tracking, and power grid equipment inspections.

• Consumer & Smart Hardware: Shared mobility, wearables, drone positioning, and elder/child personal trackers.

2. Core Parameter Comparison Tables

2.1 Embedded SMD GNSS Modules

2.2 Integrated & Industrial GNSS Terminals

3. In-Depth Structural & Performance Analysis

3.1 Form Factor Comparison: SMD Module vs. GMOUSE vs. DIN-Rail

Selection Summary: Choose SMD modules for high-volume built-in products. Choose GMOUSE to bypass RF engineering and hit the market quickly. Choose DIN-Rail terminals for legacy industrial retrofits where no coding or hardware design is possible.

3.2 Performance Tiers: Single-Frequency vs. Pure BeiDou vs. Dual-Frequency

1. Single-Frequency General Series (L1): Mature architecture and low chip cost. This is the industry-standard go-to for general tracking. It meets expectations in open environments, though accuracy may fluctuate in dense urban high-rises due to multipath effects.

2. Pure BeiDou National Series (B1): Focused entirely on the BDS-3 constellation. Excellent for projects requiring strict domestic regulatory compliance (such as municipal utilities or state-backed infrastructure). It performs beautifully within its regional coverage footprint but is not suitable for purely overseas markets.

3. Dual-Frequency High-Performance Series (L1 + L5): Computes signals across two distinct bands to cancel out ionospheric delay errors, increasing accuracy by over 40%. The L5 band heavily resists multipath interference (reflections off buildings). Boasting up to a 25Hz refresh rate, it is perfect for high-speed dynamic applications like drones or high-speed vehicle tracking.

4. Structured Selection Playbooks

4.1 By Accuracy & Performance Needs

• Standard Tracking (3~5m accuracy): Go with the E108-GN01S. It offers the highest ROI for asset tracking, environmental nodes, and shared micromobility devices.

• High-Stability Tracking (1~2m accuracy): Go with the E108-GN02S. Dual-frequency tracking ensures continuous fixes inside urban jungles and high-speed driving environments.

• Regulated Compliance: Go with the E108-BD01S to meet localized security or national supply chain mandates.

4.2 By Industry Use Case

• Logistics & Fleet Telematics: E108-GN02S + Active Vehicle Antenna. The 25Hz update rate captures high-speed lane changes, and dual-frequency handles urban overpasses seamlessly.

• Smart Battery-Powered Meters (Water/Gas): E108-GN01S. Microamp sleep currents maximize battery arrays up to 3–5 years.

• Industrial Automation / PLCs: E90-DTU-GN01. Mounts straight onto a standard 35mm DIN-rail, interfaces via RS485, and reports positions via standard Modbus RTU.

5. Engineering Design Risks & Mitigation Checklist

5.1 Antenna Placement Guidelines

• Impedance Matching: The RF trace from the module to the antenna must maintain a strict 50Ω characteristic impedance. Mismatches cause severe signal attenuation, dropping tracking sensitivity and ruining positioning accuracy.

• Enclosure Clearances: If using internal ceramic patch or FPC antennas, ensure a clean "keep-out" zone. Keep batteries, metal shields, and high-speed data buses far away from the antenna element.

• Sky View Requirement: GNSS requires a line-of-sight path to the sky. Metal enclosures block satellite signals entirely. For indoor or deep underground applications, an external active antenna run via a low-loss coaxial cable is required.

5.2 Power Supply Layout (Crucial)

• Peak Currents: While average tracking currents hover around 18–25mA, the module can spike up to 30–50mA during initial cold-start satellite acquisition. Size your LDO/DC-DC converter to handle at least 2x the peak rating.

• Ripple Suppression: Keep power supply ripple under 50mV. High-frequency switching noise on the VCC line degrades the internal Low Noise Amplifier (LNA) performance. Place a 100μF electrolytic capacitor parallel with a 0.1μF ceramic filtering capacitor right at the module’s power entry pins.

5.3 Electrical & Interface Matching

• Logic Level Shifting: Ebyte GNSS module UART lines run on 3.3V TTL logic. If interfacing with an older 5V MCU or industrial system, you must use a bi-directional logic level translator. Connecting 5V lines directly to the module will permanently damage the internal processor.

• ESD Protection: For external antenna ports or exposed serial ports on the device chassis, always populate TVS diode arrays near the physical connectors to prevent static electricity (ESD) from frying the module's RF front-end.