US 9,810,804 B2
Collecting and transmitting control source electromagnetic signals
Alexander Edward Kalish, The Woodlands, TX (US)
Assigned to Deep Imaging Technologies, Inc., Tomball, TX (US)
Filed by Deep Imaging Technologies, Inc., Tomball, TX (US)
Filed on Mar. 5, 2014, as Appl. No. 14/198,303.
Application 14/198,303 is a continuation of application No. 13/187,759, filed on Jul. 21, 2011, abandoned.
Claims priority of provisional application 61/366,916, filed on Jul. 22, 2010.
Prior Publication US 2014/0184227 A1, Jul. 3, 2014
Int. Cl. G01V 3/12 (2006.01); G01V 3/38 (2006.01); G01V 3/08 (2006.01)
CPC G01V 3/12 (2013.01) [G01V 3/083 (2013.01); G01V 3/38 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method, comprising:
placing a plurality of receiver systems on a surface of the earth to form a receiver matrix;
placing a controlled source electromagnetic transmitter on the surface of the earth;
synchronizing, by the plurality of receiver systems and the transmitter, clocks in the plurality of receiver systems and the transmitter;
detecting changes in electric and magnetic fields of sub-surface formations induced by a controlled source electromagnetic pulse; and
reducing noise in signals received by the plurality of receiver systems, comprising:
up-converting received signals at a received frequency to a higher frequency;
filtering noise in the up-converted received signals to produce filtered signals; and
down-converting the filtered signals from the higher frequency to the received frequency.