An on-site survey is the primary task of working live in distribution networks. However, traditional manual method not only very intuitive but also inefficient. The application 3D point cloud technology has opened up new avenues for surveys life This paper focused on Point Transformer V2(PTV2) model segmentation network clouds. Given its deficiencies boundary discrimination ability and limited feature extraction when processing clouds networks, an improved Non-local Focal Loss-Point V2...

Cancer is one of the leading causes death worldwide. Radiotherapy a standard treatment for this condition and first step radiotherapy process to identify target volumes be targeted healthy organs at risk (OAR) protected. Unlike previous methods automatic segmentation OAR that typically use local information individually segment each OAR, in paper, we propose deep learning framework joint CT images thorax, specifically heart, esophagus, trachea aorta. Making Fully Convolutional Networks...

Multi-Target Multi-Camera tracking is a fundamental task for intelligent traffic systems. The track 1 of AI City Challenge 2022 aims at the city-scale multi-camera vehicle task. In this paper we propose an accurate system composed 4 parts, including: (1) State-of-the-art detection and re-identification models feature extraction. (2) Single camera tracking, where introduce augmented tracks prediction multi-level association method on top tracking-by-detection paradigm.(3) Zone-based...

The digitization of uninterrupted operation in the distribution network is great significance for improving people’s quality life and promoting economic development. As an important means achieving digitization, point cloud technology crucial to intelligent transformation network. To this end, authors embedded improved RSA (residual spatial attention) module modified loss function network, proposing a deep learning called RSA-PT semantic segmentation scene cloud. According requirements...

A complete facet model for the backscattering from rough sea surface with breaking waves is proposed in this paper. In consideration of spatial distribution on surface, able to give a good interpretation "super events" under high states, such as spikes and polarization ratios. Based model, normalized radar cross section plots configuration are calculated compared measured data. The comparisons show that tractable estimate scattering electrically large ocean states accuracy efficiency....

This paper presents a study of the microwave backscattering from 2-D time-evolving nonlinear surfaces sea with finite depth by using second-order small-slope approximation. According to shallow-water dispersion relation, revised hydrodynamic choppy wave model in connection an experiment-verified spectrum for finite-depth water is employed construct profiles sea. The numerical results show that discrepancy between infinite-depth and their counterparts monostatic normalized radar cross section...

Two-dimensional inverse synthetic aperture radar (2D ISAR) system can produce 2D electromagnetic images of a target, while failed to provide the 3D information. In this study, novel method for super resolution ISAR imaging is proposed via employing U-estimation signal parameters rotational invariance technique (U-ESPRIT) and slice principle. First, scattered field data tensor converted into set matrix by stacking slices along one specific dimension. Then, U-ESPRIT applied extract isolated...

A robust semi-deterministic facet model for the computa- tion of radar scattering cross section from ocean-like surface is presented. As a facet-based theory, it more comprehensive which can re∞ect specular and difiuse conflgurations, as well mono- bistatic features. Signiflcant computational e-ciency good agreement with experimental data are observed, makes proposed suitable fast estimation on EM scatter- ing synthetic aperture (SAR) imagery simulation marine scene.

Traditional wake detection methods have been successfully applied to the of a simple linear ship wake. However, they cannot effectively detect nonlinear and weak under high sea state conditions, whereas deep-learning-based method could play its strengths in this respect. Due lack sufficient measured SAR images meet training requirement for deep learning method, paper explores by combining electromagnetic scattering model with technique. The composite scene surface is established first, then...

The small slope approximation (SSA) method is a practical to calculate the electromagnetic (EM) scattering from rough surfaces. However, SSA requires that interval for sampling surfaces must be enough, such as less than one-tenth of incident wavelength. This constraint condition will cause problem huge memory consumption and insufficient when EM large calculated. Although hard disk has space keep data can solve problem, its read/write speed still too slow. In addition, massive transmission...

The mixture of wind wave and swell is simulated based on a bimodal spectrum nonlinear hydrodynamic theory, the investigation Doppler spectra backscattered signals from such sea surfaces in time-varying marine environment performed by applying second-order small-slope approximation model. results are also compared with some popular data sets, comparison it can be found that variation trends shift spectral bandwidth different for mixed waves various weights, which reflect qualitatively...

An angular composite model (ACM) is applied to analyse the bistatic scattering from two-dimensional sea surfaces. When local scattered angle lies in specular region, Kirchhoff approximation (KA) used evaluate reflection, which predominates total this region; small perturbation method (SPM) employed deal with diffuse reflection dominated by roughness, as situated out of region. This avoids dwelling on tough question about how choose proper cut-off wave number like well-known two-scale (TSM)....

The Doppler spectral characteristics of electromagnetic backscattered echoes from dynamic nonlinear surfaces finite-depth sea is investigated with the second-order small-slope approximation (SSA-II).The revised hydrodynamic choppy wave model (CWM) combining an experiment-verified shoaling coefficient utilized to profiles, and simulated show steeper crests more flat troughs as depth decreases.First, Comparison spectra for linear shows that effect greatly enhances shift spectrum bandwidth,...

Based on the local configuration angle division to select corresponding method for electromagnetic scattering calculation from rough sea surface, this paper presents an angular cutoff composite model: when scattered is in specular region that given by approximately 20 degrees cone around direction, Kirchhoff approximation applied evaluate reflection, which dominates total region; small perturbation employed handle diffuse reflection predominant as situated out of region. Numerical results...

Small slope approximation (SSA) is a widely accepted approach in sea surface electromagnetic (EM) scattering studies. Nevertheless, the spatial sample interval used for should be around or even smaller than one-eighth of incident wavelength to ensure EM calculation accuracy, which requires huge amount computation, creating an obstacle numerical simulation, especially high microwave band waves and large scenes. In this paper, novel realization SSA proposed significantly decrease computation...

The practical method, small slope approximation is employed to analyze EM scattering from sea surface. Considering the simulation of actual scene, size surface very large and it should be much larger than target's if a target exists. However, memory consumption huge always existing personal computer (PC) when frequency at X band or higher band. Here, spectral decomposition modeling (SDM) proposed decrease without reducing efficiency. SDM method uses quite less keep data surface, so that...

To simulate the multiple scattering effect of target in synthetic aperture radar (SAR) image, hybrid method GO/PO method, which combines geometrical optics (GO) and physical (PO), is employed to field target. For ray tracing time-consuming, Open Graphics Library (OpenGL) usually accelerate process tracing. Furthermore, improved for simulation low pixel situation. pixels are arranged corresponding rectangular wave beams one by one, result sum contribution values all beams. get high-resolution...

A novel type of sea surface taking the influence changed water depth toward shore into account is presented based on newly proposed depth-limited spectrum, and characterization electromagnetic (EM) scattering from such nearshore shallow performed by using second-order small-slope approximation theory (SSA-II), which proved to be suitable for studying EM electrically large dynamic surface. deep-sea model applied verify SSA-II comparing exact numerical solution. Then, coherent incoherent...

In the former model for sand surface electromagnetic (EM) scattering, ripples are generally viewed as a standard sine-shaped wave surface, which artificially deprives many inherent properties of natural ripples. For example, have two pretty distinct sides: Y-junctions and variable texture directions. these reasons, corresponding scattering models deserve doubts to final calculated results. On other hand, usually statistical models, not favorable in target coupling problems synthetic aperture...

The main purpose of this paper is to investigate the Doppler spectra from ship wakes on two-dimensional sea surfaces and further estimate motion characteristics. analysis helpful detect existence ships surface. And it will be an alternative method when radar cross-section values are not competent identify target. In study, for different polarizations compared with without ship’s based second-order small slope approximation method. As expected, there appears second spectral peak wake...

This paper presents a numerical investigation of electromagnetic scattering from ship-generated internal wave wake and its underlying two-dimensional sea surfaces. The geometric modeling linear surfaces as well nonlinear choppy model (CWM) are performed successively. Then, the normalized radar cross-section (NRCS) calculations carried out using second-order small-slope approximation (SSA-2) in bistatic monostatic configurations. To study characteristics wakes that usually have large coverage...

The microwave polarimetric scattering from two-dimensional (2-D) wind fetch-and water depth-limited nearshore sea surface is investigated by using the second-order small-slope approximation (SSA-II).The waves are simulated taking into account influences of fetch and depth.Based on this, joint influence depth normalized radar cross section (NRCS) surfaces for both co-polarizations cross-polarization in different directions mainly studied.Monostatic bistatic numerical results indicate that...

Inverse synthetic aperture radar (ISAR) imaging is an efficient method for providing high resolution image of maneuvering target especially in many military applications. Practically, the received echoes complex are always described as cubic phase signals (CPS). Then, migrations through cells inevitably induced. Additionally, scenes which multiple targets exist, situations become even worse. In this paper, algorithm parameters estimation and ISAR proposed, where adjacent cross correlation...