Tech Insights: Reliability Through Multi-GNSS and Multi-WAN

For precise positioning, we rely on a multi-GNSS strategy. Multiple GNSS receivers are operated in parallel, and their signals are evaluated using the GPS Daemon (GPSD). An intelligent algorithm continuously selects the best available signal.

The selection process follows several steps:

1. The system first checks for a valid 3D fix—a position solution with all three spatial dimensions. GNSS receivers with a 3D fix are prioritized.

2. Next, it evaluates the number of satellites currently in use—the more, the better.

3. If a receiver fails or cannot provide a valid position, data from another receiver is automatically used instead.

This approach ensures continuous and stable positioning, even under challenging reception conditions.

To ensure network connectivity, we also rely on redundancy in WAN connectivity. Our system runs on OpenWRT, which supports the integration of multiple WAN interfaces. With the help of the mwan3 package, several internet connections can be monitored and managed simultaneously.

This setup allows:

• Automatic failover to a backup connection in case the primary link goes down,

• Load balancing across multiple WAN links,

• Improved overall availability of network services.

As a result, our measurement device remains operational and able to transmit data reliably, even in the event of network disruptions.