A multi-sensor electromagnetic (EM) system and method for measuring gradients of EM signals. The multi-sensor EM system includes a frame; a transmitter device attached to the frame and configured to generate a primary EM field; a receiver device attached to the frame and configured to record a secondary EM field generated by the earth after being excited by the primary EM field; and a gradient sensor device attached to the frame and configured to record a gradient of the secondary EM field.

The present aspects provide a tracking and spatial location system of magnetic sensors applied in extraction and transport processes in open pit mines or underground mines, allowing spatially locating one or more sensors that transmit magnetic signals through of one or more collectors that perform a reading and processing of these signals. The present aspects also to provide a tracking and location method that makes use of the magnetic sensors tracking and spatial location system, comprising the necessary steps to perform the tracking and determine the location of the sensors.

The present aspects provide a tracking and spatial location system of magnetic sensors applied in extraction and transport processes in open pit mines or underground mines, allowing spatially locating one or more sensors that transmit magnetic signals through of one or more collectors that perform a reading and processing of these signals. The present aspects also to provide a tracking and location method that makes use of the magnetic sensors tracking and spatial location system, comprising the necessary steps to perform the tracking and determine the location of the sensors.

Man-portable locator systems for locating buried or otherwise inaccessible pipes, conduits, cables, wires, and/or inserted transmitters using magnetic field antenna arrays and signal processing to analyze and display information about multiple buried utilities simultaneously are disclosed.

An airborne electromagnetic survey system for geophysical prospecting comprising: a frame with a frame front section opposite a frame tail section, the frame configured to be lifted and towed by an aircraft via a tow arrangement during survey operation, the frame configured to support a transmitter coil configured to transmit an magnetic moment, wherein the frame comprises multiple frame segments, at least one of the frame segments comprising a first connection and a second connection for connecting to another one of the frame segments, a structural support providing a rigid structure between the first and second connections, and a frame segment surface providing the frame segment with an aerodynamic profile, wherein the aerodynamic profile is configured to provide aerodynamic properties to the frame, and wherein when the frame is towed by the aircraft, the frame has substantially a fixed frame shape and is substantially in a fixed operational orientation.

An airborne electromagnetic survey system for geophysical prospecting comprising: a frame with a frame front section opposite a frame tail section, the frame configured to be lifted and towed by an aircraft via a tow arrangement during survey operation, the frame configured to support a transmitter coil configured to transmit an magnetic moment, wherein the frame comprises multiple frame segments, at least one of the frame segments comprising a first connection and a second connection for connecting to another one of the frame segments, a structural support providing a rigid structure between the first and second connections, and a frame segment surface providing the frame segment with an aerodynamic profile, wherein the aerodynamic profile is configured to provide aerodynamic properties to the frame, and wherein when the frame is towed by the aircraft, the frame has substantially a fixed frame shape and is substantially in a fixed operational orientation.

The present invention provides a filter which is configured to filter frequencies created by noise outside of the band of interest and to then amplify the filtered signal to allow a weaker signal to be used for guidance. According to a first preferred embodiment, the filter of the present invention includes a 5th order active high pass filter cascaded with a 5th order active low pass filter. According to a further preferred embodiment, the filter of the present invention preferably provides a cutoff of frequencies below 700 Hz and above 1500 Hz. According to a further preferred embodiment, the filter of the present invention further uses a voltage amplifying circuit to amplify the filtered signal.

In an embodiment, a computer-implemented method of selecting sampling locations in a field is disclosed. The method comprises receiving, by a processor, input data including a map for a management zone in a field indicating one or more values of a set of agricultural characteristics for each of a plurality of locations in the management zone. The method further comprises identifying, by the processor, a set of values for the set of agricultural characteristics for each of a group of locations in the management zone based on map. In addition, the method comprises normalizing a set of model values for the set of agricultural characteristics used by an agricultural modeling tool and the set of values of the set of agricultural characteristics for each of the group of locations in the management zone. The method also comprises selecting one of the group of locations as a sampling location based on the normalized set of model values, the normalized sets of values for the group of locations, and a first distance constraint related to a distance to a boundary of the management zone. Finally, the method comprises causing display of information regarding the selected location.

In an embodiment, a computer-implemented method of selecting sampling locations in a field is disclosed. The method comprises receiving, by a processor, input data including a map for a management zone in a field indicating one or more values of a set of agricultural characteristics for each of a plurality of locations in the management zone. The method further comprises identifying, by the processor, a set of values for the set of agricultural characteristics for each of a group of locations in the management zone based on map. In addition, the method comprises normalizing a set of model values for the set of agricultural characteristics used by an agricultural modeling tool and the set of values of the set of agricultural characteristics for each of the group of locations in the management zone. The method also comprises selecting one of the group of locations as a sampling location based on the normalized set of model values, the normalized sets of values for the group of locations, and a first distance constraint related to a distance to a boundary of the management zone. Finally, the method comprises causing display of information regarding the selected location.

A system for tracking a below-ground transmitter from an aerial receiver. The receiver has an antenna assembly, a processor, and a propulsion system. The antenna assembly detects the magnetic field from an underground transmitter and generates an antenna signal. The processor is programmed to receive the antenna signal and generate a command signal, which moves the receiver to a position above the transmitter. Once in the desired position, which may be a reference plane at a fixed elevation, the antenna assembly measures the magnetic field to determine the location of the drill bit along borepath.