The image immediately registered by the RASCAN radars is not exactly an image that describes actual distribution of reflectors in the space behind the sounding plane. What radar registers is an interference pattern created by these reflectors that is also called a hologram. For a distant object its interference pattern has a form of ripples due to diffraction. The diffraction effects, being stronger for a more distant object than for a closer one, may prevent a concealed object from identification.

To compensate for diffraction effects RASCAN-5 software provides a focusing procedure that can be relied on when sounding relatively homogeneous media.

Advantage of RASCAN-5 over RASCAN-4 is shown below.







RASCAN-4/7000


RASCAN-5/7000

Word "RASCAN" cut from aluminum foil, under 6 cm of foamed concrete (frequency is 6.6 GHz)





RASCAN-4/7000


RASCAN-5/7000

Two reinforcement rods in concrete (depth is 11 cm, distance between rods is 8 cm, frequency is 6.6 GHz)



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