tailieunhanh - Báo cáo hóa học: " Resolution-enhanced radar/SAR imaging: an experiment design framework combined with neural network-adapted variational analysis regularization"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học đề tài : Resolution-enhanced radar/SAR imaging: an experiment design framework combined with neural network-adapted variational analysis regularization | Shkvarko et al. EURASIP Journal on Advances in Signal Processing 2011 2011 85 http content 2011 1 85 o EURASIP Journal on Advances in Signal Processing a SpringerOpen Journal RESEARCH Open Access Resolution-enhanced radar SAR imaging an experiment design framework combined with neural network-adapted variational analysis regularization Yuriy Shkvarko Stewart Santos and Jose Tuxpan Abstract The convex optimization-based descriptive experiment design regularization DEDR method is aggregated with the neural network NN -adapted variational analysis VA approach for adaptive high-resolution sensing into a unified DEDR -VA-NN framework that puts in a single optimization frame high-resolution radar SAR image formation in uncertain operational scenarios adaptive despeckling and dynamic scene image enhancement for a variety of sensing modes. The DEDR -VA-NN method outperforms the existing adaptive radar imaging techniques both in resolution and convergence rate. The simulation examples are incorporated to illustrate the efficiency of the proposed DEDR-VA-related imaging techniques. Keywords SAR system image enhancement image reconstruction neural network remote sensing 1. Introduction In this article we consider the problem of enhanced remote sensing RS imaging stated and treated as an ill-posed nonlinear inverse problem with model uncertainties. The problem at hand is to perform high-resolution reconstruction of the power spatial spectrum pattern SSP of the wavefield scattered from the extended remotely sensed scene via space-time adaptive processing of finite recordings of the imaging radar SAR data distorted in a stochastic uncertain measurement channel. The SSP is defined as a spatial distribution of the power . the second-order statistics of the random wavefield backscattered from the remotely sensed scene observed through the integral transform operator . Such an operator is explicitly specified by the employed radar SAR signal modulation

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