Raytheon Company

Clayton Davis

Benjamin P Dolgin

James C Zellner

Steven Cotten

Michael R Moan

Gerald W Robertello

A method of performing geolocation of receivers, transmitters, and conductive objects includes detecting, with one or more receivers, magnetic field signals generated by one or more transmitters, with each transmitter including two or more co-located coils that are electrically unstable and unbalanced, and that have a mechanically stable orientation with respect to one another. The magnetic field signals from each of the two or more co-located coils of each of the two or more transmitters are decomposed into individual magnetic field components. A set of invariant scalar values that are independent of orientation of one or more magnetic antennas associated with the one or more receivers are calculated from the individual magnetic field components, and the position of an object is determined using the set of invariant scalar values.

Beacon-based geolocation using a low frequency electromagnetic field

Methods and apparatus for producing multi-spectral images having variable (non-uniform) magnification over the lateral extent of the image. In one example, a multi-spectral imaging system includes a first sensor sub-system configured to receive electromagnetic radiation in a first spectral band from a scene and to provide a first image signal, a second sensor sub-system configured to receive electromagnetic radiation in a second spectral band from the scene and to provide a second image signal, a processor coupled to the first and second sensor sub-systems and configured to produce a first image of the scene from the first image signal, and a second image of the scene from the second image signal, the second image having a variable lateral magnification, and a display coupled to the processor and configured to display the second image overlaid with the first image.

Multi-spectral optical tracking system and methods

A method for detecting tunnels within an area comprising in one embodiment the steps of providing horizontal tensor gravity gradients for the area, calculating a plurality of gravity gradient vector field pairs from the horizontal tensor gravity gradients, each gravity gradient vector field pair including one gravity gradient vector field and a respective orthogonal gravity gradient vector field, detecting dipolar points and polar source points in each of the one and respective orthogonal gravity gradient vector fields for each gravity gradient vector field pair, identifying the polar source points that are present in one but not in both of the one gravity gradient vector field and the respective orthogonal gravity gradient vector field for each gravity gradient vector field pair to identify endpoints, and distinguishing the endpoints resulting from surface features from the endpoints resulting from tunnels. The polar source points form the endpoints of the tunnels.

Growing community of inventors

Springfield, VA, United States of America

Clayton Davis