39results about How to "Improve radiation quality" patented technology

A disk braking device for a motorcycle ensures radiation quality of a disk plate and reduces friction member abrasion of a friction member. A plurality of through-holes are formed in the disk plate and a plurality of notches are formed at peripheral edges of the disk plate. The through-holes are arranged so that one of the through-holes or less is disposed on a radial line extending from the center of the disk plate.

The invention discloses a method for removing large-area thick clouds for optical remote sensing images through multi-temporal data. If large-area clouds exist in optical remote sensing images, and non-cloud data exist in other multi-temporal images in the areas, cloud area data can be repaired and reconstructed through complementary information of the data. The method comprises using all temporal non-cloud data for dictionary learning, taking relevance among images into account adaptively, learning an over-complete dictionary and optimal sparse representation coefficients of the images, and repairing and reconstructing the data in thick cloud areas. According to the method for removing large-area thick clouds, the different complementary information in multi-temporal image thick-cloud areas is used, relevance of the images serves as the weight, the image thick-cloud area data are filled by aid of a novel sparse representation theory, and accordingly, not only the high accuracy is obtained, but also the idea for removing large-area thick clouds is expanded, and an important practical significance is provided.

The invention discloses a method for measuring relative radiance of large-scanning angle sliding spotlight SAR satellite systems. The method comprises the steps of: selecting a uniform scattering scene as an imaging area; carrying out imaging and range attenuation correction on echo data to obtain single-looking complex image data; getting rid of non-uniform scattering area in the image so as to eliminate adverse effect of subsequent relative radiance measurement; smoothing the image by utilizing a certain rectangular window so as to reduce the noise influence and obtain an amplitude image; averaging multiple images with same beam positions to further reduce the noise influence; determining an azimuth angle and a lower visual angle corresponding to each pixel of the smoothed amplitude image according to radar parameters such as an azimuth scanning range, a range beam width and the like of radar; and carrying out even-order tow-dimensional surface polynomial fitting on the smoothed amplitude image by taking the azimuth angle and the lower visual angle as variables, so as to obtain relative radiance of a system. By utilizing the method, high-precision measurement results for relativeradiance of large-scanning angle sliding spotlight SAR satellite systems can be effectively obtained, so that the method can be used for relative radiation correction of the systems so as to improvethe image quality.