This paper develops a transmit (Tx) waveform de- sign technique for dual-function radar-communication systems that provide both multiple-input multiple-output (MIMO) radar and multi-user single-output (MU-MISO) com- munication functionalities. We propose hybrid linear-nonlinear precoding (HLNP) signaling scheme, in which the dual-use is superposition of linearly-precoded communica- tion symbols nonlinearly-precoded improves performance. To attain good Tx beampattern ambiguity properties, we...

The major challenges of vanadium-based layered materials are their dissolution tendency and the instability bulk-phase structure, resulting in unsatisfactory cyclability, particularly at lower current densities.

In this paper, we propose a generic point cloud encoder that provides unified framework for compressing different attributes of samples corresponding to 3D objects with arbitrary topology. the proposed scheme, coding process is led by an iterative octree cell subdivision object space. At each level subdivision, positions are approximated geometry centers all tree-front cells while normals and colors their statistical average within cells. With framework, employ attribute-dependent encoding...

Radio frequency interference (RFI) is a major issue in accurate remote sensing by synthetic aperture radar (SAR) system, which poses great hindrance to raw data collection, image formation, and subsequent interpretation process. This paper provides comprehensive study of the RFI mitigation techniques applicable for an SAR system. From view spectrum allocation, possible terrestrial spaceborne sources system their geometry are analyzed. Typical signal models various types provided, together...

Unlike the conventional phased array, frequency-diverse array (FDA) employs a tiny frequency increment across elements, which is capable of providing range–angle–time-dependent beampattern, and thereby offers potential benefits in target localization interference mitigation. Reported literature on FDA mostly focuses its intrapulse (fast-time) property ignores interpulse (slow-time) feature induced by offset. In this article, incorporating neglected inherent slow-time coding feature, novel...

As a wideband radar system, synthetic aperture (SAR) may conflict with several electromagnetic systems, such as frequency modulation (FM), TV, and other communication systems. These signals, termed radio interference (RFI), severely interfere SAR systems from generating high-resolution image. Numerous previous researches focused on the RFI suppression problem, among which semiparametric methods have been verified to state-of-the-art performance. However, most of are computationally expensive...

The Sustainable Development Goals Satellite 1 (SDGSAT-1), equipped with the Glimmer Imager (GLI), provides high-resolution nighttime light (NTL) data across multiple spectral bands, potentially facilitating monitoring of sustainable development goals (SDGs). This study developed a denoising algorithm for multispectral SDGSAT-1 GLI and demonstrated that its capacity allows measurement SDG indicators 7.1.1, 11.5.2, achievement target 7.3. results indicate (1) can effectively remove strips...

We present a new approach to the modeling and decomposition of Gaussian mixtures by using robust statistical methods. The mixture distribution is viewed as contaminated density. Using this model model-fitting (MF) estimator, we propose recursive algorithm called density (GMDD) for successively identifying each component in mixture. proposed scheme has advantages that are desirable but lacking most existing techniques. In GMDD number components does not need be specified priori, proportion...

For the interference suppression problem on synthetic aperture radar (SAR) systems, traditional methods have focused how to remove one kind of through nonparametric and parametric methods. However, complicated interferences, including both narrowband interferences (NBIs) wideband (WBIs), severely affect SAR imaging in practical scenarios. Also, spectra can be continuously distributed, which are even harder mitigate from received signal. Hence, this article, we propose a smoothing multiview...

The synthetic aperture radar (SAR), as a wideband system, operates over large frequency band ranging from the low very high to millimeter waves. It often overlaps in with other radio-frequency systems including radio, television, and cellular networks. Therefore, interference (RFI) suppression is severe test for SAR systems. Recently, some methods are proposed suppress RFI based on sparse recovery range-frequency domain low-rank extraction azimuth dimension. However, all previous exploit one...

Unmanned aerial vehicle (UAV) synthetic aperture radar (SAR) is usually sensitive to trajectory deviations that cause severe motion error in the recorded data. Because of small size UAV, it difficult carry a high-accuracy inertial navigation system. Therefore, order obtain precise SAR imagery, autofocus algorithms, such as phase gradient (PGA) method and map-drift (MD) algorithm, were proposed compensate based on received signal, but most them worked range-invariant abundant prominent...

Synthetic aperture radar (SAR) as a wideband system is subject to complicated interferences, such radio frequency interference or other narrowband interferences (NBIs). In order suppress the NBI, voluminous literature focused on its signal models and characteristics, sinusoidal model relatively constant frequencies. However, in practice, environment commonly complicated. It hard accurately mitigate them clearly an easy way, especially for time-varying interferences. this article, novel...

Synthetic aperture radar (SAR), as a wideband system, may be subject to strong interferences with variety of signals. The narrowband interference (NBI) exemplifies the most typical its kind, such form radio frequency (RFI). With development SAR imaging technology, high-resolution wide-swath (HRWS) imagery technology now reaches maturity finally take shape in current systems. To obtain HRWS images, multichannel (MC-SAR) system has been employed tackle contradictory requirements for both high...

Carrying out green energy transformation, implementing clean power replacement and supply, developing a new system are some primary driving forces needed to fulfill China's carbon-peak carbon-neutral strategic goals. The construction of systems in provinces cities is rapidly, the lack typical model promotes application. path design should be based on actual development grid different regions, use characteristics, other needs carry differentiated design. In this context, study analyzes...

Abstract Micro‐Doppler effect is a vital feature of target that reflects its oscillatory motions apart from bulk motion and provides an important evidence for recognition with radars. However, establishing the micro‐Doppler database poses great challenge, since plenty experiments are required to get signatures different targets purpose analyses interpretations radars, which dramatically limited by high cost time‐consuming. Aiming overcome these limits, low‐cost powerful simulation platform...

Multiple-input multiple-output synthetic aperture radar (MIMO SAR) system has drawn considerable attention because of its extra degrees freedom for high resolution and wide swath compared with the traditional multichannel SAR system. But how to extract matched signal without unmatched interferences is foremost task MIMO In this paper, by using orthogonal frequency division multiplexing chirp signals as transmitted signals, it demonstrated that robust principal component analysis (RPCA)...

A synthetic aperture radar (SAR) system is severely affected by radio frequency systems, such as TV and cellular networks. Previous studies showed that narrowband interference (RFI) low rank used the nuclear norm a low-rank regularization to extract RFI from received signal. However, not an appropriate approximation of true function. Hence, in this paper, reweighted matrix-factorization (RMF) algorithm decomposition (MFD) are proposed suppress for SAR where RMF uses scheme approximate...

Domain shift, which occurs when there is a mismatch between the distributions of training (source) and testing (target) datasets, usually results in poor performance trained model on target domain. Existing algorithms typically solve this issue by reducing distribution discrepancy input spaces. However, for kernel-based learning machines, highly depends statistical properties data reproducing kernel Hilbert spaces (RKHS). Motivated these considerations, we propose novel strategy matching...

Conventionally, a single-channel synthetic aperture radar (SC-SAR) system can hardly detect weak moving targets simply. In this paper, time-Doppler chirp-varying (TDCV) filter is proposed for ground target indication and parameter estimation with the airborne SC-SAR system. The method easy to implement mainly includes three steps. First, traditional 2-D frequency range-Doppler algorithm used generate an original image. Second, second-order range cell migration (RCM) phase term partly...

Silver nanoparticles are used in many commercial products daily life. Exposure to nanosilver has hepatotoxic effects animals. This study investigated the cytotoxicity associated with polyvinylpyrrolidone-coated (23.44 ± 4.92 nm diameter) exposure human hepatoma cell line (HepG2) and normal hepatic (L02), molecular mechanisms induced by HepG2 cells. Nanosilver, doses of 20–160 μg mL −1 for 24 48 h, reduced viability a dose- time-dependent manner membrane leakage mitochondria injury both...

In this paper, we study the joint design of a transmit sequence and receive filter for an airborne multiple-input multiple-output (MIMO) radar system to improve its moving target detection performance in presence signal-dependent interference. The optimization problem is formulated maximize output signal-to-noise-plus-interference ratio (SINR), subject waveform constant-envelope (CE) constraint. To address challenge non-convex problem, propose novel framework solving over Riemannian manifold...