omplex of equipment GROT-12

Practice of many years in production and operation of georadars GROT makes it possible in 2006 to develop and start repetition work of new georadars GROT-12 in a short space of time. Taking into account the obtained experience the radical modernization of all georadar components and software has been realized. Power consumption was decreased, quick change of batteries with the following charge from different sources was provided. Weight and size have been diminished. Easily demountable antennas make possible to do sounding in out-of-the-way places. Using of notebook allows to process obtained data in real time mode. It is possible to use GPS receivers for coordinate definition inside sofware.

Georadar GROT-12 is a portable geo-introscope of the subsurface sounding with the increased power. It displays mapping of geo-radiolocation profiles on the computer screen in the process of measurement. The operating principle of georadar is based on sounding of subsurface medium with electromagnetic pulses with an amplitude of 5-18 KV and duration on the order 20 ns (1 NS - one billionth fraction of a second), and the registration of the time delay of the reflected signals from the interfaces of media with different permittivities. Georadar is capable to probe soil at the depth of 30-50 m on the heavy soils and above 300 m on the light dry soils.

Georadar ensures the determination of the depth of the bedding of the interfaces and thickness of geological layers, the arrangement of relatively larger underground cavities and heterogeneities.

Georadar can be used, in essence, in geology and building.
In geological applications: for mapping potential raw structures (for example, opal-bearing) and tectonic dislocations; tracking lithologically heterogenous rock of contrasting composition to depths of up to 100 metres; location of local anomaly-forming objects in plan and at depth (brecciation zones, caverns, karst funnels, quarz veins etc.).

In hydrogeological investigations: assessment at depth of water-bearing horizons, mapping of water-permeable and water-resistant horizons, searching for underground water.

In petroleum geology: searching for structural traps of the anticline type, determination at depth of stratified rock types-collectors of petroleum and gas accumulation.

In archeological geology: search for ancient or abandoned subterranean mine workings, evaluation of tailings dumps of mines etc.

In many other applications: construction, ecology, municipal services, criminal/forensic investigations, mine and shell location, searching for buried treasuries, ancient buildings, cavities etc.

The main advantage of GROT-12 in comparison with previous modifications of georadars GROT and LOZA series is a signal quantization in a full frequency range without strobing and comparison.
In GROT-12 considerably decreased signal distortions during quantization; resolving capacity was enhanced. Data processing and interpretation on computer in real time mode considerably simplified construction of the device. It also allowed to vary sounding technology by the data collecting and processing software without changes inside device construction.

Work with the georadar is produced by two or three operators in the manual or automatic regime, with the adjustable period of starting of the registration process. Georadar is controlled by computer, data processing and interpretation are conducted in real time.

Georadar is equipped by changeable resist-loaded dipole antennas with average operating frequency of 25 MHz, 37.5 and 75 MHz. Sizes of antennas are 6.0m, 4.0m and 2.0m accordingly.
Maximal size of antennas in staked state is about 1 meter for antennas of all types. Application of antennas with different lengths from 2 to 10 meters allow to increase sounding depth. In case of need the delivery of transmitter with increased power and longer antennas is possible.

Weight of transmitter is 1.7 kg. Weight of reciever is 1.8 kg.

Expeditions 2006 have demonstrated high functional facilities of georadar GROT-12. Compactness and small sizes of detachable antennas make it possible to perform profiling in difficult conditions of taiga. The software adaptable to sounding technology allowed to do data interpretation directly in field conditions.