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Home Environmental Scanning georadar

Scanning georadar

Description

In the scanning georadar the principle of stepped frequency continuous wave of the sounding signal in the frequency band of 140-260 MHz is utilized. The heterodyne architecture of the radar is applied to synchronous detecting of the radar-tracking returns by means of mixing of the received signal with a basic signal and shifting it to the fixed intermediate frequency. The system contains separate synthesizers of frequencies for radiation and reception. The basic signal turns out by mixing of a part of radiated signal with signal of basic synthesizer of frequencies. High level of intermediate frequency (1 MHz) allows suppressing the noise inherent to the homogeneous architecture. The reflected signals after mixing in the quadrature phase detector with a basic signal turns in quadrature narrow-band signals I and Q. Than these signals are digitized by means of high-precision ADC with large dynamic range. The narrow bandwidth of the receiver raises signal/noise ratio of the receiver. In the georadar the new magnetic slot antenna is used, in which possibility to switch polarization of radiation and reception by means of electronic commutator is provided.

Innovative Aspect and Main Advantages

The device is intended especially for applications connected with solving problems in engineering geology, hydrogeology and ecology. The main advantage of the scanning georadar consists in possibility of extraction of the additional information about physical properties of the environment and separate subsurface obstacles. This feature is implemented on the basis of usage of phase structure of reflected signals from subsurface obstacles. The comparatively slow frequency change of the carrier frequency of probing signal enables the evaluation of electrical constants of environment directly from the radar-tracking data. For this purposes new mathematical algorithms of signal processing have been developed, they are grounded on the signals phase structure.

Areas of Application

  • Diagnostics of soil conditions under the surface in cities, industrial areas and separate buildings (estimation of humidity of layers, detection and mapping areas of water distribution in upper layers, finding out emptiness and tunnels in soil).
  • Estimation of conditions of subsurface structure of weirs soils, dikes, embankments (estimation of degree of moistening of soil layers, presence of decompaction of ground and tunnels).
  • Estimation and diagnostics of subsurface structure and conditions of landslides, mapping their area of distribution and estimation of their stability.
  • Mapping areas of distribution of liquid oil products (lenses) as a result of unauthorized losses and failures under the surface of industrial districts.
  • Finding out heterogeneities in subsurface structure of soils, related to archaeological area.


Front view of the scanning georadar

Stage of Development

Tested, available for demonstration – field tested. Patented.

Contact Details

Kogut Aleksandr Yevgenievich
Organization: Usikov Institute of Radiophysics and Electronics of NAS of Ukraine
Address: 12, Ac. Proskura St., 61085, Kharkov, Ukraine
+38-057-720-34-57, +38-057-720-33-19,  Mob: +38-050-401-16-96
Fax: +38-057-315-21-05
This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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