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INGV-IT Radar


Airborne 60 MHz enveloper radar utilizing 2 folded dipoles

The radar INGV-IT (radio-echo-sounding system, RES system) is an instrument that employs electromagnetic wave able to penetrate into the ice to obtain information on the internal structure of the ice, bedrock position, ice thickness and its inhomogeneities in the investigated area.

The principle of functioning is rather easy. A sinusoidal wave packet is transmitted by means of an antenna beneath the wing of an airborne. The wave pulse is reflected back by media interfaces discontinuity and iohomogeneities. The receiving antenna picks-up all the reflections from the different interfaces having different delay times.

Figure 1 Principle of radar sounding

This is a schematic description of the instrumentation:

  • The synthesiser generates RF wave pulse of 60 MHz of frequency having time duration from 200 to 1000 ns;
  • The pulses are amplified by a 4kW power amplifier and sent to the transmitting antenna beneath the wing of an airborne;
  • The received pulses are picked-up by means of a receiving antenna and sent to the logarithm broad band receiver having 100 dB of dynamic with other external attenuation stages;
  • The acquisition system is constitutes by a PC with an external 8 bit 20 MHz ADC board able to acquire 1280 samples 64micro seconds time delay.

The antennas are resonant folded dipoles.

 

Figure 2 Antennas installed beneath the wings of a Twin Otter airborne

 

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