GM4W - GeoGuard Module for Water vapor monitoring

GM4W provides new technology for the reliable and continuous water vapour monitoring with high horizontal resolution. It is based on low-cost single-frequency Global Navigation Satellite Systems (GNSS) receivers, designed and developed by GReD through a collaboration with Proteco Consortium. They can also be used to detect the deformation and movements of the ground (e.g. landslides, subsidence) and critical infrastructure (e.g. dams, bridges, high voltage towers, etc) and are designed to be able to operate under all weather conditions.
Technology demonstrated in relevant environment.
Representative model or prototype system, which is well beyond that of TRL 5, is tested in a relevant environment. Represents a major step up in a technology’s demonstrated readiness. Examples include testing a prototype in a high-fidelity laboratory environment or in a simulated operational environment.
Testing plan completed
The testing plan and the BRIGAID’s Testing Innovation Framework (TIF) has been rightly applied and finished. The TRL of the innovation has been effectively reached.
We should actually consider two different TRLs: - the hardware (i.e. the monitoring units which will be deployed on the field) is at TRL 9, since the same GNSS units have been used by large clients of GReD for critical infrastructure (i.e. bridges, dams, high-voltage towers) and land (i.e. landslides) displacement monitoring for more than 1 year. - the overall water vapour monitoring system, which includes innovative (server-side) components such as the local ionospheric delay modelling and the continuous estimation of tropospheric delays, from which the integrated amount of precipitable water vapour can be inferred. This is more likely at TRL 6, since the technology has been demonstrated in relevant environment, namely by dedicated dense networks deployed for testing; however, it was not demonstrated in an actual operational environment, where water vapor data would have to be analysed for probabilistic nowcasting in order to issue timely early warnings.

How does it work?

GM4W uses low-cost single-frequency GNSS receivers (basically the same chipsets that are used within smartphones and car navigation systems) to retrieve Precipitable Water Vapour (PWV) after compensanting single-frequencies measurements for the ionosphere-induced delay estimated by local ionospheric models. These models, which are used with a dense network of low-cost receivers, can be estimated by a Precise Point Positioning adjustment of the observed pseudo-ranges between a receiver and all the satellite in view at a given epoch. GM4W technology consists of IP67-certified weather-proof monitoring units that are able to exploit low-cost GNSS data for the estimation of PWV.

January, 2019
- Innovation description and "How it works" updated based on BRIGAID testing report - URL alias renamed by Sergio Contreras (WP3 leader)