Probing device for the detection and measurement of phenomena relative to the terrestrial globe environment

摘要

This sounder comprises a channel (1) for transmitting electromagnetic waves towards the phenomenon to be studied and a channel (2) for receiving the echoes of these waves. It is characterized in that the emission channel (1) comprises means (3) for producing maintained electromagnetic waves, with adjustable fixed frequencies and adjustable progressive frequencies and means (4) for modulating these waves by pulses of adjustable recurrence: the waves of modulated progressive frequencies are interposed between the waves of fixed, modulated frequencies. The reception channel (2) comprises means (11, 13) for detecting the phases of the echoes of fixed frequency waves and the amplitudes of the echoes of progressive frequency waves and means (34) for measuring the group propagation time , of the modulated wave emitted. Application to the study of the ionosphere, sea swell, etc.