Results 31 to 40 of about 993,247 (318)

Phased array parameter optimization for low-altitude targets [PDF]

Proceedings International Radar Conference, 2002
The paper investigates optimal integration times, search strategies, and confirmation strategies for an X-band, pulse-Doppler, phased array radar which is performing the horizon surveillance function.
Trunk, G. V., Wilson, J. D., Hughes, P. K.   +2 more
openaire   +2 more sources

Anti-Occlusion UAV Tracking Algorithm with a Low-Altitude Complex Background by Integrating Attention Mechanism

Drones, 2022
In recent years, the increasing number of unmanned aerial vehicles (UAVs) in the low-altitude airspace have not only brought convenience to people’s work and life, but also great threats and challenges. In the process of UAV detection and tracking, there
Chuanyun Wang, Zhongrui Shi, Linlin Meng, Jingjing Wang, Tian Wang, Qian Gao, Ershen Wang   +6 more
doaj   +1 more source

A target threat assessment method for low-altitude aircraft

Journal of Physics: Conference Series, 2020
Abstract In recent years, with the gradual opening up of chinese low-altitude airspace, and the government active support for the development of the general aviation and drone industries, the traditional physical protection is mainly aimed at ground threats, resulting in the threat and harassment from air targets has become increasingly ...
Xiaoqian Nie, Peng Yan, Bingqi Wang, Binbin Wu, Chengshuai Gao   +4 more
openaire   +1 more source

UAV Low-Altitude Remote Sensing Inspection System Using a Small Target Detection Network for Helmet Wear Detection

Remote Sensing, 2022
Automated construction site supervision systems are critical for reducing accident risks. We propose a helmet detection system with low-altitude remote sensing by UAVs in this paper to automate the detection of helmet-wearing workers to overcome the ...
Hang Liang, Suyoung Seo
semanticscholar   +1 more source

Study on Characteristics of Coupling Field from Super-low Altitude Target under Diverse Terrestrial Environments in Semi-active Radar System

MATEC Web of Conferences, 2018
A novel electromagnetic scattering model is presented for studying coupling field of super-low altitude target under diverse terrestrial environments in semi-active radar system.
Xiang Zou Gao, Ming Tong Chuang, Gao Qian, Wang Tong, Peng Peng, Chao Yuan Jun, Jun Jiang Xiao, Wang Xin   +7 more
doaj   +1 more source

ON THE ACHIEVABLE UPPER LIMIT OF THE ELEVATION ANGLES OF EFFECTIVE DIRECTION FINDING OF TARGETS OVER THE SEA BY THE ROOT-MUSIC METHOD PROVIDED WITH ADEQUATE A PRIORI PARAMETERS [PDF]

Radio Physics and Radio Astronomy
Subject and Purpose. The paper investigates the accuracy of measurements of the elevation angles of targets located near the surface of a disturbed sea in the area from the upper limit of their extremely small values to the free space zone.
Yu. F. Logvinov, Yu. A. Pedenko, N. G. Reznichenko   +2 more
doaj   +1 more source

Unmanned Aerial Vehicle with Underlaid Device-to-Device Communications: Performance and Tradeoffs [PDF]

, 2016
In this paper, the deployment of an unmanned aerial vehicle (UAV) as a flying base station used to provide on the fly wireless communications to a given geographical area is analyzed.
Bennis, Mehdi, Debbah, Merouane, Mozaffari, Mohammad, Saad, Walid   +3 more
core   +4 more sources

Radar studies of the vertical distribution of insects migrating over southern Britain: the influence of temperature inversions on nocturnal layer concentrations [PDF]

, 2005
Insects migrating over two sites in southern UK (Malvern in Worcestershire, and Harpenden in Hertfordshire) have been monitored continuously with nutating vertical-looking radars (VLRs) equipped with powerful control and analysis software.
Barlow, Janet Fraser, Chapman, J.W., Edwards, A.S., Reynolds, D.R., Smith, A.D., Woiwod, I.P., Wood, Curtis Ron   +6 more
core   +1 more source

Low-Altitude Remote Sensing Opium Poppy Image Detection Based on Modified YOLOv3

Remote Sensing, 2021
Poppy is a special medicinal plant. Its cultivation requires legal approval and strict supervision. Unauthorized cultivation of opium poppy is forbidden.
Chunshan Wang, Qian Wang, Huarui Wu, Chunjiang Zhao, Guifa Teng, Jiuxi Li   +5 more
doaj   +1 more source

Analytical sun synchronous low-thrust manoeuvres [PDF]

, 2012
Article describes analytical sun synchronous low-thrust ...
Becerra V. M., Betts J. T., Betts J. T., Brown D. W., Hanson J. N., Malcolm Macdonald, McInnes C. R., Ramler J. R., Stephanie Y. Docherty, Vallado D., Wakker K. E.   +10 more
core   +1 more source