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US 11,753,126 B2Granted
Underwater vehicle inspection
AssigneeRaytheon Company
InventorAndrew Wilby
Life of this patent
Estimating the term…
Abstract
Methods and apparatus for inspecting an underwater vehicle. In embodiments, a system receives a SAR image for at least a portion of an exterior surface of an underwater vehicle and performs CCD processing to compare a baseline SAS image for the underwater vehicle with the received SAR image of the underwater vehicle to generate a CCD output corresponding to a measure of similarity of the baseline SAS image and the received SAS image. The system determines whether there was tampering of the underwater vehicle based on the measure of similarity.
Claims20
A method, comprising
- receiving a SAS image for at least a portion of an exterior surface of an underwater vehicle, the received SAS image being a three-dimensional image, wherein a third dimension of the SAS image is obtained by:
- generating azimuth-range images of the surface, recovering height information of the surface by applying a digital elevation model (DEM) to measure phase differences between different complex images of the surface, and determining elevation based on the azimuth-range images and the height information, wherein the SAS image is generated by using a sensor to perform at least three passes over the underwater vehicle from a standoff distance in the order of 100 m, each of the passes being arranged to cover a difference portion of the exterior surface of the underwater vehicle, each of the passes being performed with a detection sensitivity in the order or 0.5 mm;
- performing coherent change detection processing to compare a baseline SAS image for the underwater vehicle with the received SAS image of the underwater vehicle to generate a CCD output corresponding to a measure of similarity of the baseline SAS image and the received SAS image;
- and
- determining whether there was tampering of the underwater vehicle based on the measure of similarity.
2 more elements
An apparatus, comprising:
- a processor and memory configured to:
- receive a SAS image for at least a portion of an exterior surface of an underwater vehicle, the received SAS image being a three-dimensional image, wherein a third dimension of the SAS image is obtained by:
- generating azimuth-range images of the surface, recovering height information of the surface by applying a digital elevation model (DEM) to measure phase differences between different complex images of the surface, and determining elevation based on the azimuth-range images and the height information, wherein the SAS image is generated by using a sensor to perform at least three passes over the underwater vehicle from a standoff distance in the order of 100 m, each of the passes being arranged to cover a difference portion of the exterior surface of the underwater vehicle, each of the passes being performed with a detection sensitivity in the order or 0.5 mm;
- perform coherent change detection processing to compare a baseline SAS image for the underwater vehicle with the received SAS image of the underwater vehicle to generate a CCD output corresponding to a measure of similarity of the baseline SAS image and the received SAS image;
- and
- determine whether there was tampering of the underwater vehicle based on the measure of similarity.
3 more elements
An article comprising a non-transitory computer readable medium having stored instructions that enable a machine to:
- receive a SAS image for at least a portion of an exterior surface of an underwater vehicle, the received SAS image being a three-dimensional image, wherein a third dimension of the SAS image is obtained by:
- generating azimuth-range images of the surface, recovering height information of the surface by applying a digital elevation model (DEM) to measure phase differences between different complex images of the surface, and determining elevation based on the azimuth-range images and the height information, wherein the SAS image is generated by using a sensor to perform at least three passes over the underwater vehicle from a standoff distance in the order of 100 m, each of the passes being arranged to cover a difference portion of the exterior surface of the underwater vehicle, each of the passes being performed with a detection sensitivity in the order or 0.5 mm;
- perform coherent change detection processing to compare a baseline SAS image for the underwater vehicle with the received SAS image of the underwater vehicle to generate a CCD output corresponding to a measure of similarity of the baseline SAS image and the received SAS image;
- and
- determine whether there was tampering of the underwater vehicle based on the measure of similarity.
2 more elements
Dependencies are inferred from the claim text.