US 11,852,718 B2
System and method for determining a change of position and orientation of an object
Joern Ostermann, Hannover (DE); and Aron Sommer, Cologne (DE)
Filed by Joern Ostermann, Hannover (DE); and Aron Sommer, Cologne (DE)
Filed on Sep. 19, 2019, as Appl. No. 16/576,210.
Claims priority of application No. 102018123334.5 (DE), filed on Sep. 21, 2018.
Prior Publication US 2020/0096629 A1, Mar. 26, 2020
Int. Cl. G01S 13/90 (2006.01); G06T 7/70 (2017.01); G06V 10/20 (2022.01); G06V 20/64 (2022.01); G01S 13/00 (2006.01); G06V 10/46 (2022.01)
CPC G01S 13/9023 (2013.01) [G01S 13/9005 (2013.01); G06T 7/70 (2017.01); G06V 10/255 (2022.01); G06V 20/64 (2022.01); G06V 10/46 (2022.01)] 19 Claims
OG exemplary drawing
 
11. A synthetic aperture radar comprising:
a processor; and
a computer-readable medium storing instructions which, when executed by the processor, cause the processor to perform operations comprising:
acquiring a radar image containing an object;
dividing the radar image into at least two subimages;
acquiring short radar information comprising a first reflected pulse and/or a quantity derived therefrom, the first reflected pulse comprising information on image data of the radar image;
for the short radar information, applying an autofocus method which determines a respective change in distance for each of the at least two subimages; and
determining a change of position and a change in orientation of the object, which is given for each point of the object by the respective change for each of the at least two subimages, wherein, for determining the change in of the object, an image sharpness of respective subimages are maximized under an additional secondary condition that a function which assigns to each center point of a subimage or to each position of a strong reflector of a subimage a respective value of the change in distance of the subimage is approximated by a smooth two-dimensional surface.