| 摘要 |
An optical angle of arrival measurement system uses an optical element to form at least one narrow width line on a focal plane array (FPA) which is oblique with respect to the FPA's row and column axes and which traverses at least two rows or columns along its length; forming two perpendicular narrow width lines in a cross-pattern is preferred. Interpolating the position of the lines on the FPA provides coordinates that can be used to calculate the optical angle of arrival in accordance with &thetas;x=A(x)·tan−1(x/f), and &thetas;y=B(y)·tan−1(y/f), where f is the focal length of the optical element, and A(x) and B(y) are parameters that account for optical distortion and other imperfections of the system. The resolution δ&thetas; of the angle of arrival measurement can be improved to at least δ&thetas;˜(d/n)/f, where d is the FPA pixel width and n is the length in pixels of the imaged line. |
