High positioning accuracy requires sub-nanosecond time synchronization. Stability of synchronization can be reviewed using Sync Stability tool which is part of the RTLS Manager. The metrics that can be watched using this tool are "2nd Difference", "RSSI", and "First Path". This topic is described in more detail in the section Sync Stability Tab.
If the chart is not plotted after the selection of master anchor the reason may be an incorrect network configuration or blocked port 8000 between RTLS Manager and Host PC.
List of required communication ports are described within section Network Architecture and Required Ports.
Sync Stability Key Parameters
- Whether the 2nd Difference does not exceed 2
- Whether the 2nd Difference is stable over time without significant packet loss or fluctuations above 2.
If one of the slaves are missing:
- Anchor is offline
- Anchor have different sync RF profile or channel configuration
- Anchor have different IP address for RTLS Server
When sync stability is above 2 also after warm up time, then:
- Try to rotate anchor a bit or select different master anchor
If all slaves anchors have fluctuations behavior then issue may be caused by the master anchor.
Correlation of RSSI and First Path - This section is for more advanced users - not required for common deployments.
By comparing RSSI and First Path parameters, it is possible to estimate
- Whether the anchors are synchronized through LoS signal
- Or the sync signal is propagated through obstacles, affected by reflection or scattered.