Results 21 to 30 of about 8,149 (274)

Radio environment maps for military cognitive networks: density of small-scale sensor network vs. map quality

EURASIP Journal on Wireless Communications and Networking, 2020
In this paper, we present the dependency between density of a sensor network and map quality in the radio environment map (REM) concept. The architecture of REM supporting military communications systems is described.
Marek Suchański, Paweł Kaniewski, Janusz Romanik, Edward Golan, Krzysztof Zubel   +4 more
doaj   +1 more source

Design and Testing of a Low-Tech DEW Generator for Determining Electromagnetic Immunity of Standard Electronic Circuits

Energies, 2021
This article describes the effect of high-power electromagnetic environments (HPEMs) on the operation of all basic elements of electrical power networks. Frequency bands are defined for the HPEM environments. Attention is focused particularly on directed
Libor Dražan, René Križan, Miroslav Popela   +2 more
doaj   +1 more source

Specific Emitter Identification of Frequency Hopping Signals Based on Feature Extraction and Deep Residual Network

IEEE Access, 2022
In the modern war with complex and changeable electromagnetic environment, Specific Emitter Identification (SEI) is an important and difficult problem, which is of great significance in obtaining intelligence information, identifying ourselves or foe ...
Mingdi Li, Jun Xie, Hongjie Yang, Mengjie Geng, Jichuan Liu   +4 more
doaj   +1 more source

Spatial Spectral Band Selection for Enhanced Hyperspectral Remote Sensing Classification Applications

Journal of Imaging, 2020
Despite the numerous band selection (BS) algorithms reported in the field, most if not all have exhibited maximal accuracy when more spectral bands are utilized for classification.
Ruben Moya Torres, Peter W.T. Yuen, Changfeng Yuan, Johathan Piper, Chris McCullough, Peter Godfree   +5 more
doaj   +1 more source

Detection and parameter estimation of intra-pulse modulated radar signals in complex interference environments+

SN Applied Sciences, 2023
The main aim of this review is to describe in detail an advanced technique to detect and estimate the prior unknown parameters of intra-pulse modulated signals and the verification with typical radar signals.
Van Minh Duong, Jiri Vesely, Petr Hubacek, Premysl Janu, Xuan Luong Tran   +4 more
doaj   +1 more source

A Soft-Kill Reinforcement Learning Counter Unmanned Aerial System (C-UAS) With Accelerated Training

IEEE Access, 2023
In recent years, unmanned aerial vehicles (UAVs) have gained significant popularity and are used for many applications, from entertainment to surveillance and the modern battlefield.
Douglas Lopes Da Silva, Renato Machado, Olympio L. Coutinho, Felix Antreich   +3 more
doaj   +1 more source

Radar Position Estimation by Sequential Irradiation of ESM Receivers

Sensors, 2021
In this article, a new technique for determination of 2D signal source (target) position is proposed. This novel approach, called the Inscribed Angle (InA), is based on measuring the time difference of sequential irradiation by the main beam of the ...
Petr Hubáček, Jiří Veselý, Jana Olivová   +2 more
doaj   +1 more source

Detection and Parameter Estimation Analysis of Binary Shift Keying Signals in High Noise Environments

Sensors, 2022
In this paper, a new method for detecting and estimating the parameters of a binary phase shift keying (BPSK) signal, based on a cross-correlation function, is proposed. The proposed method consists of two stages.
Van Minh Duong, Jiri Vesely, Petr Hubacek, Premysl Janu, Nhat Giang Phan   +4 more
doaj   +1 more source

Source Enumeration Approaches Using Eigenvalue Gaps and Machine Learning Based Threshold for Direction-of-Arrival Estimation

Applied Sciences, 2021
Source enumeration is an important procedure for radio direction-of-arrival finding in the multiple signal classification (MUSIC) algorithm. The most widely used source enumeration approaches are based on the eigenvalues themselves of the covariance ...
Yunseong Lee, Chanhong Park, Taeyoung Kim, Yeongyoon Choi, Kiseon Kim, Dongho Kim, Myung-Sik Lee, Dongkeun Lee   +7 more
doaj   +1 more source

Narrow band space scanning two-dimensional linear frequency diverse array radar

The Journal of Engineering, 2019
Two–dimensional (2D) linear frequency diverse array (FDA) concept is extended to scan a 2D wide angular sector. This is achieved by highly unequal frequency increments in orthogonal 2D directions of the array.
Ramazan Çetiner, Altunkan Hizal
doaj   +1 more source