Results 71 to 80 of about 1,234 (185)

Altitude estimation of maneuvering targets in MIMO over-the-horizon radar

, 2012
Target altitude estimation is an important problem in over-the-horizon radar (OTHR) systems for target tracking and classification. Narrow signal bandwidth and rich propa-gation environment in OTHR render this problem difficult and challenging.
Yimin D. Zhang, Moeness G. Amin, Braham Himed   +2 more
core   +1 more source

APPROVED FOR PUBLIC RELEASE

, 2001
Over-the-horizon radar (OTHR) and microwave radar networks can together generate track data over a wide surveillance region. However the data is often subject to ambiguity and uncertainty due to the complexities of the HF signal propagation environment ...
P. W. Sarunic, K. A. B. White, M. G. Rutten   +2 more
core  

Impacts of Forecast Time and Verification Area Setting on the Targeted Observation of Typhoon

Atmosphere
The results of the identification of sensitive areas are affected by the forecast time and verification area settings in targeted observations. Understanding this setting issue is important for improving the effectiveness of the identification of ...
Jiaqi Kang, Jianxia Guo, Jia Wang, Chao Zhang   +3 more
doaj   +1 more source

Detection of Slow Radial Velocity Ship by OTHR

Procedia Computer Science, 2018
Abstract In order to detect ship in the spread sea clutter caused by ionospheric disturbance, algorithms of short coherent integration time (CIT) are used in over-the-horizon radar system. Here, ECVC (Estimate Clutter Via Correlation) algorithm is employed to provide higher resolution to detect ship of slow radial velocity.
Huan Luo, Hui Xiao, Jun Yuan, Hongtu Xie
openaire   +1 more source

Prevalence of Positive Montoux Test in the Province of Sindh

Liaquat Medical Research Journal, 2020
Tuberculosis is a global health emergency. WHO has predicted Pakistan to be at 8th position out of the 22 countries having highest burden of Tuberculosis in the world. At present this disease has a prevalence of >1% in our country.
Abid Chang
doaj  

OTHR Multipath Tracking with Uncertain Co-ordinate Registration

, 1998
Multipath probabilistic data association (MPDA) exploits discrete multipath propagation improve tracking performance in systems suchas over-the-horizon radar.
G. W. Pulford
core  

High-Resolution Sea Surface Target Detection Using Bi-Frequency High-Frequency Surface Wave Radar

Remote Sensing
The monitoring of the sea surface, whether it is the state of the sea or the position of targets (ships), is an up-to-date research topic. In order to determine localization parameters of ships, we propose a high-resolution algorithm for primary signal ...
Dragan Golubović, Miljko Erić, Nenad Vukmirović, Vladimir Orlić   +3 more
doaj   +1 more source

Chemoenzymatic Synthesis of Sialyl Oligosaccharides with Sialidases Employing Transglycosylation Methodology

, 2016
A series of sialyloligosaccharides was synthesized using the transglycolytic activity of the sialidases from Vibrio cholerae, Clostridium perfringens, Salmonella typhimurium, and Newcastle disease virus.
Dirk Schmidt (3026079), Joachim Thiem (1902037), Bernd Sauerbrei (3026076)   +2 more
core   +1 more source

HF Over-the-horizon radar system performance analysis [PDF]

, 2007
The basic concept of the structure and properties of the ionosphere are discussed to explain how the performance of the over-the-horizon radar (OTHR) system is affected.
Liu, Bin-Yi
core   +1 more source

Emerging Trends in Radar:long-range surveillance in North Polar Region [PDF]

Sky-wave over-the-horizon radar (OTHR) relies on bouncing radio waves off the ionosphere to achieve long-range surveillance, even beyond the Earth's curvature.
Themens, David R.; id_orcid, Thayaparan, Thayananthan   +1 more
core   +1 more source