Unattended seismic network
The project includes a set of REF TEK 130 digitizers (stations) covering area from several hundreds of meters to several hundreds of kilometers. The digitizers are equipped with the internal magnetic storage (microdrives, compact flash). The data is stored internally and then dumped to the hard disc at the data center. The data can be played back and viewed with the SNDP software to obtain seismic source location and perform other data processing. Real-time playback simulation is available in SNDP.
Real-time portable experiment
The project includes a set of REF TEK 130 digitizers distributed at a limited territory (limited by telemetry line of site), and equipped with the IEEE 802.11X radio telemetry. The operation of the network is controlled by the REF TEK Network Controller (RNC) from the remote data center. SNDP software at the data center provides real-time data processing including seismic source location.
Small aperture array
Same as Unattended seismic network, but the SNDP provides additional processing mechanism based on beamforming and F-K analysis in real-time and in playback mode. In this case the stations are usually distributed over the area of 1 to 3 square kilometers, and equipped with the IEEE 802.11X radio telemetry.
Telemetry seismic regional network
The project represents the network of REF TEK 130s with the aperture of several tens to several hundreds of kilometers. Each digitizer is equipped with the VSAT telemetry station (normally with the dish size of 1.2 to 1.8 meters). The data acquisition, control and processing center includes RNC and SNDP software. Since the power consumption of VSAT is significant, each observation site must be equipped with the enough AC power supply.
Global seismic monitoring network
The core of the solution is SNDP working within the CTBTO specification frameworks. Seismic, infrasound, hydroacoustic and radionuclide data in CD1.0 or CD1.1 format is collected and processed by SNDP at the data center. REF TEK 130s (or other digitizers supplying the data in the above formats) acquire the data and send it over the Internet or over the dedicated data links to data center.
Structural monitoring network
The strong motion sensors incorporated with the REF TEK ANSS 3 to 18 channels acquisition system transmit data over Internet, Ethernet, dial-up or GSM networks. Internal triggering mechanism based on main structural health parameters thresholds is available for low power consumption availability. SNDP real-time data processing is available when the IP network is available. Modal analysis application is based the proprietary software and on ARTeMIS software (www.svibs.com). For bridges and high-rise buildings the solution includes IEEE 802.11X radio telemetry.
Tsunami monitoring system
There are several features allowing to build tsunami monitoring system based on REF TEK 130 / SNDP platform. The principle feature is the integration of small aperture array (SAA) hardware and software techniques. Having one to three SAA allows locating the seismic source with much higher precision than just one 3-component tsunami station, especially in a presence of high environmental noise. This approach is also essential when running the tsunami telemetry network framing the region under research is not available due to poor infrastructures.
Microseismic unattended monitoring network
Very small aperture array (up to 90 sensors distributed over the area of 1 to 3 square kilometers) of REF TEK 130 serves for microseismicity studies of the oil and gas reservoirs, hydrothermal reservoirs, well bore positioning during drilling process, etc. The sensors are buried into the near surface boreholes, so hydrofracture monitoring experiments cost much lower than using deep and expensive VSP boreholes. Special processing procedures supplied by the SNDP software provide the success of this approach.
Microseismic telemetry monitoring network
Same as for the above, but the data is collected in real-time at a local processing center via IEEE 802.11X telemetry links. SNDP provides data processing in real-time, which is essential for such applications as hydrofrac monitoring. 4D near real-time display helps the analyst to monitor the development of the fracture.
Mobile perimeter protection monitoring system
The system including two REF TEK 130 equipped with the proper geophones can cover 1 km of the protected perimeter.
Human safety systems
The system can be used for search of people buried in the ruins of the collapsed buildings. The high frequency geophones are inserted into the soil or debris and the SNDP at an acquisition laptop locates the survived victims during the silence intervals.
Local telemetry features
In all local telemetry solutions based in IEEE 802.11X protocol, the cell network simulation is provided. It means that for complex topology or monitoring structure architecture when the line of sight is not available for all the nodes of the acquisition network, cellular multihoping is available. So in some cases just one line of sight for the whole network can make the job done.
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