Abstract: Systems and methods are disclosed herein for a pressure tolerant energy system. The pressure tolerant energy system may comprise a pressure tolerant cavity and an energy system enclosed in the pressure tolerant cavity configured to provide electrical power to the vehicle. The energy system may include one or more battery cells and a pressure tolerant, programmable management circuit. The pressure tolerant cavity may be filled with an electrically-inert liquid, such as mineral oil. In some embodiments, the electrically-inert liquid may be kept at a positive pressure relative to a pressure external to the pressure tolerant cavity. The energy system may further comprise a pressure venting system configured to maintain the pressure inside the pressure tolerant cavity within a range of pressures. The pressure tolerant cavity may be sealed to prevent water ingress.

Abstract: Systems and methods are described herein for manufacturing a pressure vessel component. The pressure vessel component may be made from a metal that is cast to produce a gross pressure vessel component. Casting the metal may comprise sintering the metal followed by a hot isostatic press (HIP) process. In other embodiments, casting the metal may comprise pouring molten metal into a mold. Portions of the gross pressure vessel component may have an increased thickness located at predetermined positions on the gross pressure vessel component. These portions may include bosses or other designed features intended for the finalized pressure vessel component. The gross pressure vessel may be indexed to select the portions, and these selected portions may then be machined to produce the final pressure vessel component.

Abstract: Systems and methods for a robust underwater vehicle are described herein. A robust underwater vehicle may include a force-limiting coupler connecting an actuation system to an actuation fin. The force-limiting coupler may be configured to break away from the actuation system upon receiving a threshold force. The robust underwater vehicle may also comprise hull sections connected by a threaded turnbuckle. Carbon-fiber axial strength members may mate with the threaded turnbuckle to pull the hull sections together to a specified preload tension. The robust underwater vehicle may also include a blazed sonar array protected by a carbon fiber bow including a plurality of slits. The plurality of slits may provide significant protection to the sonar array while simultaneously allowing one or more transducers to transmit sonar signals in a two-dimensional plane.

Abstract: Systems and methods for adding buoyancy to an object are described herein. A buoyant material may be enclosed inside a flexible container, heated, and inserted into a free flooded cavity inside the object. The flexible container may then be formed to the shape of the cavity. After the flexible container is formed to the shape of the cavity, the flexible container may be cooled. The flexible container may hold a pre-determined amount of the syntactic material that provides a fixed amount of buoyancy. According to another aspect, systems and methods for packing a vehicle are described herein. In some embodiments, a buoyant material may be molded into the shape of a hull of a vehicle, and a plurality of cutouts may be extracted from the buoyant material which are specifically designed to incorporate one or more instruments.

Abstract: Systems and methods described herein include improved data gathering, climate modeling and weather forecasting techniques. In particular, the systems include using Global Positioning System (GPS) measurements obtained from a network of GPS devices for simultaneously determining atmospheric parameters such as water vapor content, temperature and pressure, and correcting for errors in the GPS measurements, themselves. The systems and methods described herein include a central processor for receiving data from a plurality of GPS devices and updating a computerized climate or weather forecasting model. Advantageously, by using data from a plurality, and in some embodiments a very large number of GPS devices, the systems and methods described herein may solve for both propagation velocity of electromagnetic signals through the atmosphere (used for calculating atmospheric parameters useful in climate modeling) and GPS position error values (used for error correction at each GPS device).

Abstract: A method and apparatus that coherently correlates, in either the frequency domain, or the real domain, an image of a terrain with an extant holographic image of the terrain. Strong correlations indicates matches between features common between the two holograms, or a hologram and an image, and location of the strong correlations indicates position of the features relative to the imager (e.g. a sonar aboard a ship, or a radar aboard a helicopter). Correlation information can be used for navigation.

Abstract: The systems and methods described herein relate to systems and methods for synthetic aperture sonar (SAS) or radar including seismic surveying.

Abstract: A method and apparatus for eliminating aspect dependence of images generated by a radiative scanner such as a radar, sonar, or the like. Echoes from the scanner are received back and detected at a known and preselected number of aspects. The echo received at each aspect is multiplied by the transform of the point spread function of each of the other preselected aspects. In this manner, the frequency domain version of each echo is multiplied by the frequency domain point spread function of all of the preselected aspects, and the ultimate processed echo will be aspect independent.

Abstract: An apparatus and method for relating echoes from a surface or object produced by irradiation, such as by sonar or radar, from different grazing angles according to the relationship: f s = cf x 2 ? cos ? ? ? where fx is the spatial frequency corresponding to the size of the surface or object, ? the grazing angle, and fs the temporal frequency. In this manner one can relate to one another echoes from the same surface or object generated at different grazing angles, permitting good correlation between the echoes.

Abstract: A broadband blazed array has a plurality of elements. The elements are arranged side-by-side in a non-parallel spaced apart fashion with center-to-center spacing between adjacent elements being identical along cross-sections of the array that are aligned with the array's endfire directions.

Abstract: The systems and methods described herein relate to systems and methods for synthetic aperture sonar (SAS) or radar including the use of orthogonal signals with SAS.

Abstract: The systems and methods described herein relate to systems and methods for synthetic aperture sonar (SAS) or radar including overpinging with multiple SAS transmitters.

Abstract: The systems and methods described herein relate to systems and methods for synthetic aperture sonar (SAS) or radar including simultaneous localization and mapping (SLAM) for holographic navigation.

Abstract: The systems and methods described herein relate to systems and methods for synthetic aperture sonar (SAS) or radar including high-frequency holographic navigation.

Abstract: The systems and methods described herein relate to systems and methods for synthetic aperture sonar (SAS) having multiple transmitters and generating orthogonal pinging sequences configured to enhance performance.