GNSS Monitoring

GNSS MonitoringGea and Gemini are monitoring systems based on GNSS receivers.

They designed to monitor large structures (bridges, dams, high rise buildings) and landslides.​

Depending on the customers needs our systems can be equipped with high performance GNSS receivers achieving sub-millimetric precision or with low cost GNSS receivers still performing well and reaching 1mm precision.

Gea and Gemini work based on the data analysis coming from two or more baselines created by GNSS receivers.

A base station is identified and located outside the monitored zone, one or more monitoring stations are installed on the structure in question.

Stations communicate with each other through radio or wired connections.

A PC Server collects all data coming from the stations and analyzes the baselines.

Software can send email or sms alarms based on previous defined trigger events.

How is GNSS system accuracy increased?

This is a typical question and since we are using a GNSS receiver with 5m precision (in the worst case), how is it possible to achieve 1 mm precision?

Precision is increased on the server side with specific algorithms which work on the mitigation of the following source of errors:

  • Multipath Errors → Reflected GNSS signals which reach antenna by two or more paths.
  • Ionospheric and Tropospheric Delays → Due to the signal propagation path.
  • Orbital Errors → Slight shifts of the orbits due to gravitational forces.
  • High frequency receiver Errors → Noise introduced by electronics.

What are the advantages of using a GNSS monitoring system instead of a simple RTK station?

  • GNSS errors mitigation and precision (1cm with RTK → submillimetric with GNSS sw)
  • Data integrity control
  • Alerts
  • Multiple nodes handling

Gea : Entry level, equipped with single frequency GNSS receiver, long range low power consumption radio module and back up battery.​

Gemini : High precision (submillimetric) high rate, dual frequency high accuracy receiver, can be either connected by WiFi or LAN cable, baselines can be as long as 100Km.

Update rateUp to 50 HzUp to 5 Hz
GNSS signalSingle or Dual L1/L2Single frequency L1
Baseline< 100 Km< 5 Km
NTRIP ProtocolSupportedNot supported
Global Reference StationSupportedNot supported
Power ConsumptionMains neededOK with a small photovoltaic panel
ComunicationHigh speed LANLoRa Mesh
PriceHigh-priced SolutionLow Price


* accuracy is measured after 7 days of monitoring