2results about How to "High structural similarity" patented technology

This invention discloses a distributed synthetic aperture radar (SAR) cooperative anti-jamming method and system. The method includes: acquiring distributed SAR echo signals with interference; estimating the relative time delay of interference signals in the data received by different stations of the distributed SAR system, and constructing a low-rank enhancement matrix in the frequency domain; arranging the echo data matrix and the low-rank enhancement matrix in the frequency domain of each receiving station into a new matrix to be processed according to pulses, and constructing a distributed cooperative interference suppression convex optimization problem model for the newly constructed data matrix; solving the distributed cooperative interference suppression convex optimization problem to obtain the distributed SAR echo signal data after interference suppression, and rearranging it according to the radar to which it belongs into an initial structure for subsequent imaging. Compared with traditional interference suppression methods, the SAR image results recovered by the method of this invention have lower mean square error and higher structural similarity, and can handle noise-type interference that monostatic SAR cannot handle, that is, this invention has more effective interference suppression capability.

The application discloses a holographic display method and system based on combined modulation extended space bandwidth product, and belongs to the technical field of holographic three-dimensional display. The system comprises a laser, a beam expanding and collimating system, a spatial light modulator (SLM), a high-resolution diffraction element and an imaging surface arranged in sequence along an optical path. The core of the method is that: firstly, the dynamically modulated SLM is physically cascaded with the static and phase known high-resolution diffraction element to expand the space bandwidth product of the system; secondly, an accurate cascaded wavefront propagation model is established, and the model corrects high-frequency scattering noise through a zero padding strategy. Finally, an optimization algorithm based on automatic differentiation and gradient descent is adopted to optimize the hologram displayed on the SLM in an end-to-end manner. Through the cooperation of software and hardware, the application effectively breaks through the space bandwidth product limitation of the traditional SLM, and can realize high-quality holographic three-dimensional display with a large field of view and low noise without increasing the complexity and cost of the system.