Results 81 to 90 of about 63,321 (235)
A Review of Modeling and Control Techniques for Unmanned Aerial Vehicles
Engineering Reports, Volume 7, Issue 6, June 2025.By systematically classifying UAV modeling techniques and comparing control methods, this paper addresses a notable gap in the current literature. Furthermore, it highlights emerging trends and challenges in UAV control systems, providing valuable insights to guide future research toward enhancing the stability, efficiency, and adaptability of ...
Elisabeth Andarge Gedefaw +2 more
wiley +1 more source
Hand Gesture Recognition based on Radar Micro-Doppler Signature Envelopes [PDF]
arXiv, 2018 We introduce a simple but effective technique in automatic hand gesture recognition using radar. The proposed technique classifies hand gestures based on the envelopes of their micro-Doppler signatures. These envelopes capture the distinctions among different hand movements and their corresponding positive and negative Doppler frequencies which are ...
arxiv
Ionospheric correction of space radar data [PDF]
, 2009 Radar is a critical tool for maintaining knowledge of the many ob-jects in low Earth orbit and thus for maintaining confidence that societies around the world are secure against a variety of space-based threats. It is therefore important to raise awareness that LEO objects are embedded in the envelope of relatively dense plasma that co-rotates with the
arxiv +1 more source
Advanced Analysis of Radar Cross-Section Measurements in Reverberation Environment [PDF]
arXiv, 2023 Reverberation chambers (RCs) were recently reported as a low-cost alternative to anechoic chambers (ACs) to perform radar cross-section (RCS) pattern measurements. The method consists of using transmitting and receiving antennas pointing towards a target under test placed on a rotating mast.
arxiv
A motion compensation method for the single transmitter and multiple receivers mobile radar system
Electronics LettersThe single transmitter and multiple receivers (STMR) mobile radar system is a special distributed radar system, which has stronger detection and survival capabilities.
Qijun Lian +3 more
doaj +1 more source
Meteorological balloon Patent [PDF]
, 1967 Aerodynamically stable meteorological balloon using surface roughness ...
Scoggins, J. R.
core +1 more source
A Bare‐Earth GoogleDEM to Simulate Flooding in New Delhi, India
Water Resources Research, Volume 61, Issue 6, June 2025.Abstract Accurate flood mapping in urban environments remains a critical yet challenging task. The primary challenge lies in the accuracy of widely available topographic data, a key constraint when employing hydrodynamic models for large‐scale inundation mapping.
Yinxue Liu +5 more
wiley +1 more source
Fundamental Limits of HRR Profiling and Velocity Compensation For Stepped-Frequency Waveforms [PDF]
, 2013 The stepped-frequency (SF) waveform is an effective way to achieve high range resolution (HRR) in modern radars. In this paper, we determine some fundamental limits of SF waveforms on ambiguity, stability and accuracy of stable targets profiling, and velocity compensation accuracy of moving targets.
arxiv +1 more source
Space Weather, Volume 23, Issue 6, June 2025.Abstract Ionograms are radar echo graphs that depict vertical ionospheric density profiles, structures, fluctuations, and irregularities, with the F region represented by F‐trace and Spread‐F features in the graphs. In this paper, IonoGAN, an enhanced neural network based on the Generative Adversarial Network architecture, is proposed for direct ...
Chu Qiu +11 more
wiley +1 more source
Remotely piloted LTA vehicle for surveillance [PDF]
, 1975 Various aspects of a remotely piloted mini-LTA vehicle for surveillance, monitoring and measurement for civilian and military applications are considered.
Brown, G. J. +2 more
core +1 more source