Physics±Uspekhi 43 (5) 521±524 (2000)© 2000 Uspekhi Fizicheskikh Nauk, Russian Academy of Sciences the receiving channel that results in parasitic oscillations (ringing') of the signal, and the masking of weak signals by stronger ones. The receiving channelringing'is the chief cause of the low actual potential of radar, which usually lies in the range 40±50 dB.(The attenuation of a signal in a medium for which a radar is capable of detecting underground objects is taken as its actual potential. It should be noted that in georadar specifications one often indicates a value of the radar potential calculated as the ratio of the output power of the radar transmitter to the sensitivity of the radar receiver. This value does not allow one to estimate the actual potentialities of a device.) In recent years in the United States and Australia work has been underway on the construction of a new type of georadar with frequency scanning. The motive for this work was the attempt to avoid signalringing'in the receiving channel. Such a locator operates sequentially on a grid of frequencies and records the spectrum of the signal. Then this spectrum is normalized to the pre-recorded frequency characteristic of the receiving channel and transformed into the time region. This procedure allows one to cleanringing'from signals, however one fails to raise the actual potential of a locator, since a new problem arises Ð the necessity of detecting a weak reflected signal against the background of the uninterrupted operation of the transmitter of the locator.