Pat.#3806795:		Geophysical surveying system employing electromagnetic impulses
INVENTORS:		Morey; Rexford M., Groton, MA
ASSIGNEES:		Geophysical Survey Systems Inc., North Billerica, MA
ISSUED:		Apr. 23, 1974
FILED:		Jan. 3 , 1972
ABSTRACT: A geophysical survey system is disclosed for determining the character of the subterrain by analysis of reflections from electromagnetic pulses radiated into the ground. The system repetitively radiates into the ground a short duration electromagnetic pulse having a rise time in the order of 1 nanosecond. The antenna which radiates the pulse into the ground is employed to receive the reflections of the pulse. The received signals are coupled through a transmit-receive network to a receiver which permits the input signal waveform to be reconstructed from a sequence of samples taken by the receiver. The system is capable of generating a profile chart indicating the magnitudes of the reflected signals and the depths at which the reflections occurred.