Collecting and transmitting control source electromagnetic signals
First Claim
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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.
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Abstract
Concurrently measuring, correlating, and processing magnetic and electric field data includes measuring base band signals, and then up-converting those band signals to a higher frequency for filtering, while at the same time preserving phase and amplitude information. All timed elements in the system are rigorously synchronized. The increased data set results in improved signal-to-noise ratio and information correlation.
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Citations
17 Claims
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1. A method, comprising:
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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. - View Dependent Claims (2, 3, 4)
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5. A system, comprising:
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a plurality of controlled source electromagnetic receivers, operatively distributed across a surface of the earth, each comprising; timing circuitry configured to synchronize the receiver to a common time source, and noise reduction circuitry, comprising; frequency up-conversion circuitry, configured to up-convert received signals at a received frequency to a higher frequency; filter circuitry, coupled to the frequency up-conversion circuitry, configured to remove noise signals from the up-converted received signals, producing filtered signals; and frequency down-conversion circuitry, configured to down-convert the filtered signals to the received frequency; and a controlled source electromagnetic transmitter operatively positioned relative to the plurality of controlled source electromagnetic receivers, comprising; timing circuitry configured to synchronize the transmitter to the common time source. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A controlled source electromagnetic transmitter for use with a plurality of controlled source electromagnetic receivers, comprising:
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a constant current power supply; a timing module, synchronized with a timing source used by the plurality of controlled source electromagnetic receivers; a transmit and modulation control module, coupled to the timing module; a programmable control device, coupled to the timing module and the transmit and modulation control module; a switching circuit, synchronized by the timing module; a current transducer driven by the switching circuit; a software-defined receiver coupled between the current transducer and the programmable control device; and a transmit dipole, driven by the switching circuit. - View Dependent Claims (16, 17)
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Specification