An apparatus includes an extendable wand, and a sensor head coupled to the wand. The sensor head includes a continuous wave metal detector (CWMD) and a radar. When the wand is collapsed, the wand and the sensor head collapse to fill a volume that is smaller than a volume filled by the sensor head and the wand when the wand is extended. Frequency-domain data from a sensor configured to sense a region is accessed, the frequency-domain data is transformed to generate a time-domain representation of the region, a first model is determined based on the accessed frequency-domain data, a second model is determined based on the generated time-domain representation, the second model being associated with a particular region within the sensed region, and a background model that represents a background of the region is determined based on the first model and the second model.

An apparatus includes an extendable wand, and a sensor head coupled to the wand. The sensor head includes a continuous wave metal detector (CWMD) and a radar. When the wand is collapsed, the wand and the sensor head collapse to fill a volume that is smaller than a volume filled by the sensor head and the wand when the wand is extended. Frequency-domain data from a sensor configured to sense a region is accessed, the frequency-domain data is transformed to generate a time-domain representation of the region, a first model is determined based on the accessed frequency-domain data, a second model is determined based on the generated time-domain representation, the second model being associated with a particular region within the sensed region, and a background model that represents a background of the region is determined based on the first model and the second model.

The present invention relates to an apparatus and method for analyzing underground geophysical properties using the principle of a ground-penetrating radar. In order to resolve problems of the ground-penetrating radar (GPR) techniques of the related art which mainly acquires an underground image using electric field reflected waves and excludes acquisition of an underground image using magnetic field reflected waves, the present invention provides a system for exploring underground geophysical properties and a method for analyzing underground geophysical properties using the same, the system including: a transmission antenna which is located in a specific spot on the ground and radiates an electromagnetic pulse signal; and a pair of reception antennae which measures an electric field signal and a magnetic field signal which are generated by the radiated signal, in which the system is configured to be able to acquire not only underground images using electric field reflected waves as in technology of the related art but also underground images using magnetic field reflected waves, thereby exploring underground geophysical properties more accurately and effectively than conventional technology.

The present invention relates to an apparatus and method for analyzing underground geophysical properties using the principle of a ground-penetrating radar. In order to resolve problems of the ground-penetrating radar (GPR) techniques of the related art which mainly acquires an underground image using electric field reflected waves and excludes acquisition of an underground image using magnetic field reflected waves, the present invention provides a system for exploring underground geophysical properties and a method for analyzing underground geophysical properties using the same, the system including: a transmission antenna which is located in a specific spot on the ground and radiates an electromagnetic pulse signal; and a pair of reception antennae which measures an electric field signal and a magnetic field signal which are generated by the radiated signal, in which the system is configured to be able to acquire not only underground images using electric field reflected waves as in technology of the related art but also underground images using magnetic field reflected waves, thereby exploring underground geophysical properties more accurately and effectively than conventional technology.

A method for detecting a beacon signal using an above-ground tracker. The tracker comprises an antenna assembly comprising a plurality of antennas. Each antenna is oriented in a different direction. During operation, if the beacon signal is interrupted due to a local noise source, transmission of the beacon signal is stopped. The tracker then detects radiation from the local noise source and the processor determines a direction from which peak ambient noise arrives at the tracker. The beacon signal is then resumed. A processor included in the tracker excludes any signals generated by the antenna assembly that are representative of radiation that arrived at the tracker from the same direction the peak ambient noise arrived at the tracker. The tracker then detects the beacon signal using the non-excluded signals.

A method for detecting a beacon signal using an above-ground tracker. The tracker comprises an antenna assembly comprising a plurality of antennas. Each antenna is oriented in a different direction. During operation, if the beacon signal is interrupted due to a local noise source, transmission of the beacon signal is stopped. The tracker then detects radiation from the local noise source and the processor determines a direction from which peak ambient noise arrives at the tracker. The beacon signal is then resumed. A processor included in the tracker excludes any signals generated by the antenna assembly that are representative of radiation that arrived at the tracker from the same direction the peak ambient noise arrived at the tracker. The tracker then detects the beacon signal using the non-excluded signals.

Systems and methods for detecting the presence of a body in a network without fiducial elements, using signal absorption, and signal forward and reflected backscatter of radio frequency (RF) waves caused by the presence of a biological mass in a communications network.

Systems and methods for detecting the presence of a body in a network without fiducial elements, using signal absorption, and signal forward and reflected backscatter of radio frequency (RF) waves caused by the presence of a biological mass in a communications network.

Systems and methods for detecting the presence of a body in a network without fiducial elements, using signal absorption, and signal forward and reflected backscatter of RF waves caused by the presence of a biological mass in a communications network.

Systems and methods for detecting the presence of a body in a network without fiducial elements, using signal absorption, and signal forward and reflected backscatter of RF waves caused by the presence of a biological mass in a communications network.