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An improved autofocus method is presented based on minimum-entropy criterion for inverse synthetic aperture radar imaging. The phase-error corrections are initialized by dominant scatter algorithm, and an iterative method is derived to minimize the image entropy. A local quadratic curve is constructed to gradually approach the extremun of the image entropy function, though minimizing the image entropy,...
Aiming at hyperspectral remote sensing images containing huge amounts of data, removing redundant information and reducing processing dimensions are the premise and foundation for hyperspectral remote sensing processing and applications. In this paper, a new feature extraction algorithm based on non-negative matrix factorization with projected gradient, PGNMF for hyperspectral remote sensing images...
A type of robotic system for 3-D precision Micro-assembly was described, which can be used to assemble the micro Inertial confinement fusion (ICF) target which was made up of two Half-hohlraum (diameter:800μm∼1000μm, length:1mm) and a capsule (diameter:200μm∼500μm). The system structure and composing were described, and the key technology was introduced too. A new kinds of piezoelectric micro-gripper...
Absorption strengthen is an effective way to improve the coefficient of performance (COP) of ammonia–water absorption refrigeration system. A mathematical absorption model for ammonia–water falling film absorption in magnetic field was built in this paper to study the influence of magnetic field on the absorption process. Macroscopic magnetic field force was introduced to the mathematical model. Changes...
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