Abstract

Septentrio mosaic-G5 P3H is a high-precision GNSS receiver module integrated with dual-antenna orientation functionality, specifically designed for autonomous navigation and precision measurement applications. Boasting centimeter-level RTK positioning capability, superior anti-jamming and anti-spoofing performance, as well as an ultra-low power consumption and compact design, the mosaic-G5 P3H™ serves as the ideal positioning core for UAVs deployed in bridge structural health monitoring. It ensures continuous output of stable and reliable position and attitude data even in complex electromagnetic and multipath environments.

AI Q&A

Why do bridge monitoring UAVs require GNSS receivers with anti-spoofing capability?

Bridge monitoring operations are typically conducted in urban areas or major traffic arteries, where the surrounding electromagnetic environment is complex and prone to unintended or malicious GNSS jamming and spoofing. Spoofing signals can induce UAV positioning errors, flight path deviations, and even collisions with bridge structures or crashes. Equipped with AIM+ technology, the mosaic-G5 P3H can detect and mitigate spoofing attacks in real time, ensuring the authenticity and reliability of positioning data, and safeguarding flight safety and monitoring effectiveness.

How does the mosaic-G5 P3H maintain stable positioning without drift in bridge environments with intense multipath effects, such as steel structures and cables?

The mosaic-G5 P3H adopts APME+ multipath mitigation technology, which effectively distinguishes between direct-line-of-sight signals and reflected signals generated by steel structures, cables, bridge decks, and other components, significantly reducing multipath errors. Combined with full-frequency multi-constellation redundant tracking (supporting GPS, BDS, Galileo, GLONASS, and QZSS), it maintains stable centimeter-level positioning even in complex structural environments.

JammerTest results demonstrate that Septentrio receivers can maintain positioning under strong jamming conditions. What is the underlying technical principle?

Septentrio’s AIM+ technology employs real-time spectrum monitoring and adaptive filtering, enabling rapid identification and suppression of jamming signals upon their occurrence while sustaining satellite signal tracking. In tests, even when jamming intensity reached 10 million times that of GNSS signals, mosaic series receivers continued to output accurate positions and actively reported jamming events, demonstrating the reliability of their multi-layer receiver-side protection mechanisms.

Can the mosaic-G5 P3H maintain operation if intentional jammers are present near the bridge?

Yes. Based on JammerTest field measurements, the AIM+ technology integrated in the mosaic-G5 P3H delivers broadband jamming suppression capability. It maintains a positioning availability rate of >99.5% even against common “lighter-style” jammers (10–15 dBm) or stronger broadband jamming, ensuring uninterrupted execution of monitoring missions.

High-Precision GNSS and Orientation Technology Empowering Modern Bridge Health Monitoring

With the aging of infrastructure, bridge structural health monitoring has become increasingly critical. UAVs have emerged as essential tools for bridge surface inspection and deformation monitoring, thanks to their flexibility, high efficiency, and cost-effectiveness. However, traditional GNSS solutions struggle to provide continuous, stable, and reliable high-precision positioning and attitude references in the complex electromagnetic environments, intense multipath effects, and potential jamming scenarios associated with bridge monitoring. The Septentrio mosaic-G5 P3H module is engineered specifically for such high-demand applications.

Why should bridge monitoring UAVs choose the Septentrio mosaic-G5 P3H GNSS receiver?

The Septentrio mosaic-G5 P3H is the ideal choice because it not only delivers centimeter-level RTK positioning accuracy but also integrates dual-antenna orientation functionality, enabling direct output of heading, pitch, and roll angles without relying on drift-prone IMUs. Its JammerTest-validated AIM+ anti-jamming and anti-spoofing capabilities effectively counter malicious jamming near bridges, ensuring the authenticity and reliability of monitoring data.

Core Advantages of the Septentrio mosaic-G5 P3H GNSS Receiver

Field-Validated Resilience: Anti-Jamming and Anti-Spoofing Core

The core advantage of the Septentrio mosaic-G5 P3H lies in its extreme environmental resilience, validated through rigorous testing in JammerTest 2024. Under jamming conditions where signal intensity was 10 million times that of GNSS signals, the module maintained centimeter-level positioning accuracy, while competing products exhibited positioning drifts of hundreds of meters. When subjected to sophisticated spoofing attacks (e.g., meaconing), it continuously output true flight trajectories and issued active alerts. This performance is attributed to its AIM+ multi-layer protection technology, which ensures data integrity and uninterrupted mission execution in complex electromagnetic environments such as bridges and high-voltage power lines.

Integrated Dual-Antenna High-Precision Positioning and Orientation: Unlocking Complex Scenario Monitoring

The module innovatively integrates dual-antenna orientation with centimeter-level RTK positioning in a compact form factor (22.8×16.4 mm), achieving a heading accuracy of 0.03° (at 1-meter baseline) and horizontal positioning accuracy of 0.6 cm + 0.5 ppm. Combined with APME+ multipath mitigation and LOCK+ high-dynamics tracking technologies, it effectively addresses unique challenges in bridge monitoring, including steel structure reflections and high-altitude vibrations. It directly outputs reliable position and attitude data without dependence on drift-prone IMUs, providing a high-dimensional, high-precision data foundation for deformation monitoring.

UAV-Optimized Solution: Low Power Consumption, High Reliability, and Easy Integration

While delivering high performance, the mosaic-G5 P3H features an energy-efficient design with a typical power consumption of 0.6 W, 20 Hz update rate, and fast RTK initialization in 7 seconds, supporting extended flight durations for UAV inspection missions. Its wide operating temperature range (-40°C to 85°C) and military-grade vibration resistance ensure long-term reliability in outdoor environments. Full-frequency support and software upgradeability (e.g., for Galileo HAS/OSNMA) further guarantee future system compatibility, providing a one-stop, sustainable high-precision spatio-temporal reference for bridge health monitoring.

Integration Advantages of the Septentrio mosaic-G5 P3H in Bridge Monitoring UAV Platforms

Precise Spatio-Temporal Data Synchronization

The 20 Hz high-rate positioning data enables precise temporal and spatial synchronization with onboard LiDAR, high-resolution cameras, or thermal infrared imagers. This ensures that every frame of collected data is tagged with accurate geographic coordinates and attitude information, laying a solid foundation for subsequent generation of 2D orthomosaics, 3D point cloud models, and change detection analysis.

Efficient Inspection and Extended Flight Duration Support

Rapid startup and RTK initialization capabilities reduce mission preparation time. With a typical power consumption of only 0.6 W, it significantly lowers the power burden on UAV platforms, extending single-flight inspection time and enabling more efficient and comprehensive coverage of large bridges or bridge clusters.

Robust Environmental Adaptability

From the extreme cold of northern regions to the intense heat of southern climates, from coastal salt-spray corrosion environments to mountainous complex terrains, the mosaic-G5 P3H’s wide operating temperature range and ruggedized design ensure year-round uninterrupted monitoring operations.

The mosaic-G5 P3H: A Reliable Spatio-Temporal Sensing Core for Bridge Safety

Enhancing Monitoring Automation and Data Value

UAVs integrated with the mosaic-G5 P3H can achieve autonomous, high-precision route navigation and fixed-point hovering for monitoring, minimizing manual intervention. The high-confidence spatio-temporal data it outputs directly supports the construction of bridge digital twins, deformation trend analysis, and early warning modeling, enhancing the scientific rigor and forward-looking nature of maintenance decision-making.

Easy Integration to Accelerate Solution Deployment

It offers standard hardware interfaces including UART and USB, and fully supports data protocols such as NMEA, RTCM, and SBP, enabling seamless integration with mainstream autopilot systems (e.g., Pixhawk). Coupled with development tools and technical support provided by Septentrio, it significantly shortens the integration and development cycle of UAV systems dedicated to bridge monitoring.

A Future-Proof Investment

Choosing the mosaic-G5 P3H is not only a selection of leading-edge current technology but also a future-proof investment. Its hardware platform supports software upgrades to enable new functionalities such as Galileo High Accuracy Service (HAS) and Open Service Navigation Message Authentication (OSNMA), protecting investment and preparing for next-generation GNSS services.