Holographic radars produce a plan view in a grey scale. They operate at 5 discrete frequencies of continuous waves from 3.6 to 4.0 GHz. Since the phase of the reflected wave is dependent upon target depths, the strength of the received wave varies with depth. It produces periodic stripes for a slanting fiat object. The stripes correspond to the unlabelled contour lines on geographical maps. Slightly changing frequency shows the slanting direction that allows us to label the contour lines. A two-dimensional image with corresponding labeled contour lines could make a three-dimensional view of buried objects by some suitable software. It is an additional merit of holographic radar.
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