Results 1 to 10 of about 507,465 (200)

Approximate analysis of DF ambiguity probabilities for an interferometer direction‐finding system using gamma distributions [PDF]

Electronics Letters, 2019
To obtain high direction‐finding (DF) accuracy in electronic warfare applications, it is necessary to maximise the number of effective data points with a small angle‐of‐arrival error. Thus, a method to obtain the DF ambiguity probability for the selected set of array spacing is required.
J.H. Lee, J.I. Jo, H.K. Ryu, B.J. Park
openaire   +2 more sources

High sensitivity multi‐channel digital receiver for wideband very weak signal direction‐finding classified by machine learning

IET Radar, Sonar & Navigation
For weak signal detection with direction‐finding (DF), this article presents a new receiver design approach that combines our accumulatively increasing receiver sensitivity (AIRS) signal detection algorithm with the compressive‐sensing (CS)‐based DF ...
Chen Wu, Michael Low
doaj   +2 more sources

Quality Control for Ocean Current Measurement Using High-Frequency Direction-Finding Radar

Remote Sensing, 2023
High-frequency radars (HFRs) are important for remote sensing of the marine environment due to their ability to provide real-time, wide-coverage, and high-resolution measurements of the ocean surface current, wave height, and wind speed.
Shuqin He, Hao Zhou, Yingwei Tian, Da Huang, Jing Yang, Caijun Wang, Weimin Huang   +6 more
doaj   +2 more sources

Two-Dimensional Real-Time Direction-Finding System for UAV RF Signals Based on Uniform Circular Array and MUSIC-WAA

Drones
To address the growing security risks posed by unauthorized unmanned aerial vehicle (UAV) activities, this paper proposes a real-time two-dimensional direction-finding (DF) system for UAVs based on radio frequency (RF) signals.
Jizan Zhu, Kuangang Fan, Qing He, Jingzhen Ye, Aigen Fan   +4 more
doaj   +2 more sources

Design and Fabrication of a Compact 2D Phase Comparison Direction Finder [PDF]

Journal of Electromagnetic Engineering and Science, 2022
In this study, a compact, low-power 2D phase comparison direction finder was designed and fabricated. For the design of the direction-finding (DF) receiver, a 2D phase comparison DF equation was derived from the structure of four uniformly arranged ...
Jong-Hwa Jeon, Myoung-Ho Chae
doaj   +1 more source

Configuration of a Monopulse Antenna Assembly for Small Diameter Flight Vehicle Applications [PDF]

Journal of Electromagnetic Engineering and Science, 2021
In this letter, configuration of a monopulse direction-finding (DF) antenna assembly is presented which can be applied for small diameter flight vehicle applications.
Jaesik Kim
doaj   +1 more source

Alternative Formulation of Antenna Arrays for DF Systems Considering Active-Element Patterns and Scattering Matrices

Sensors, 2021
Direction finding (DF) systems are used to determine the direction-of-arrival (DoA) of electromagnetic waves, thus allowing for the tracking of RF sources. In this paper, we present an alternative formulation of antenna arrays for modeling DF systems. To
Bernardo Fabiani, Eduardo Sakomura, Eduardo Silveira, Daniel Nascimento, Daniel Ferreira, Marcelo Pinho   +5 more
doaj   +1 more source

Single Transmitter Direction Finding Using a Single Moving Omnidirectional Antenna

Sensors, 2022
Traditional direction-finding systems are based on processing the outputs of multiple spatially separated antennas. The impinging signal Angle-of-Arrival (AOA) is estimated using the relative phase and amplitude of the multiple outputs that are sampled ...
Guy Eliyahu, Amnon Menashe Maor, Roei Meshar, Reem Mukamal, Anthony J. Weiss   +4 more
doaj   +1 more source

Some of Problems of Direction Finding of Ground-Based Radars Using Monopulse Location System Installed on Unmanned Aerial Vehicle

Sensors, 2020
Locating active radars in real environmental conditions is a very important and complex task. The efficiency of the direction finding (DF) of ground-based radars and other microwave emitters using unmanned aerial vehicles (UAV) is dependent on the ...
Adam Rutkowski, Adam Kawalec
doaj   +1 more source

Performance-Enhancement of Platform-Based, HF Direction-Finding Systems Using Dynamic Mode Selection

IEEE Open Journal of Antennas and Propagation, 2021
We present a method to enhance the accuracy of platform-based, high-frequency (HF) direction-finding (DF) systems using dynamic mode selection. To improve bandwidth and efficiency, the metallic platform supporting the DF array is used as the primary ...
Kai Ren, Ruyu Ma, Nader Behdad
doaj   +1 more source