Results 41 to 50 of about 167,469,029 (193)

An Empirical Model of Angle-of-Arrival Variance for a Gaussian Wave Propagation through Non-Kolmogorov Turbulence

International Journal of Optics, 2020
This paper proposes an empirical model of the angle-of-arrival (AOA) variance for a Gaussian wave propagating through the weak non-Kolmogorov turbulence.
Chao Gao, Libin Jiao, Xiaofeng Li
doaj   +1 more source

NON LINEAR OPTIMIZATION APPLIED TO ANGLE-OF-ARRIVAL SATELLITE BASED GEO-LOCALIZATION FOR BIASED AND TIME-DRIFTING SENSORS [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2016
Multiple sensors are used in a variety of geolocation systems. Many use Time Difference of Arrival (TDOA) or Received Signal Strength (RSS) measurements to estimate the most likely location of a signal.
D. Levy, J. Roos, J. Robinson, W. Carpenter, R. Martin, C. Taylor, J. Sugrue, A. Terzuoli   +7 more
doaj   +1 more source

Biology, ecology and dynamics of Deborrea malgassa (Heylarts 1884) (Lepidoptera: Psychidae), the main threat to apple Malus domestica Borkh growing in Madagascar

Agricultural and Forest Entomology, EarlyView.
Bioecology parameters of the endemic Psychidae Deborrea malgassa, the main pest of apple trees in Madagascar. Spatiotemporal dynamics of Deborrea malgassa, with a peak infestation between May and August. Proposed targeted prophylaxis techniques associated with other agroecological principles will be key to reducing the vulnerability of apple orchards ...
Miora Ranaivozandriny, Henriette Rasolofoarivao, Santatra Ravelomanantsoa, Bruno Rasmussen, Bertrand Muller, Lala Harivelo Raveloson Ravaomanarivo, Hélène Delatte   +6 more
wiley   +1 more source

Cooperative positioning using angle of arrival and time of arrival [PDF]

, 2014
Localization has been one of the most highly researched topics in wireless communications in the past decade. Localization of wireless nodes can be achieved using a variety of techniques, in which range measurement and angle measurement are most commonly
Khan, MW, Salman, N, Naveed Salman, Kemp, AH, M. W. Khan, A. H. Kemp   +5 more
core   +1 more source

Two-Dimensional AOA Estimation Based on a Constant Modulus Algorithm

International Journal of Antennas and Propagation, 2017
We propose a two-dimensional (2D) angle of arrival (AOA) estimator using the algebraic constant modulus algorithm (ACMA). This algorithm was originally introduced to estimate the one-dimensional (1D) AOA.
Saleh O. Al-Jazzar, Zoubir Hamici, Sami Aldalahmeh   +2 more
doaj   +1 more source

A Simple Cross Correlation Switched Beam System (XSBS) for Angle of Arrival Estimation

IEEE Access, 2017
We propose a practical, simple and hardware friendly, yet novel and efficient, angle of arrival (AoA) estimation system. Our intuitive, two-phases cross-correlation-based system requires a switched beam antenna array with a single radio frequency ...
Ahmed Badawy, Tamer Khattab, Daniele Trinchero, Tarek M. Elfouly, Amr Mohamed   +4 more
doaj   +1 more source

Photonic Frequency Down Conversion Approach to Measure Microwave Signal Angle of Arrival

IEEE Photonics Journal, 2022
This paper presents an angle-of-arrival (AOA) measurement system based on microwave photonic frequency down conversion. It has the novelty of no LO is needed for the frequency conversion process. Instead, a ramp waveform is used to shift the frequency of
Chongjia Huang, Erwin Hoi Wing Chan
doaj   +1 more source

High Resolution Methods for Angle of Departure (AOD) and Angle of Arrival (AOA) Estimation in Bistatic Multiple-Input-Multiple-Output (MIMO) Radar Systems [PDF]

Indian Journal of Science and Technology, 2018
Objectives: In this paper we make a comparative study between two adapted methods for the estimation of the angle of departure and the angle of arrival in a Bistatic multiple input multiple output radar system. Methods: We have adapted the high resolution methods known in the literature to the estimation of the parameters of the sources with a Bistatic
A. Gharsallah, F. Harabi
openaire   +1 more source

Methodology to identify ecologically matching areas and its applications in conservation planning

Conservation Biology, EarlyView.
Abstract Identifying ecologically matching areas is both challenging and critical for understanding spatial patterns of biodiversity and advancing conservation planning. However, existing approaches often lack spatial flexibility, overlook shape and size constraints, or rely on limited environmental parameters, reducing their effectiveness in real ...
Pietro Milanesi, Alessandro Chiarucci, Alessandra Maria Bissattini, Vincenzo Buono, Gianluca Piovesan, Carlo Rondinini, Umberto Valdrè, Marco Musiani   +7 more
wiley   +1 more source

Impact of Two Radio Occultation Constellations on Numerical Weather Prediction: Polar‐Orbits Only and Mixed Polar‐Equatorial Orbits

Earth and Space Science, Volume 13, Issue 10, October 2026.
Abstract This study explores the relative impact of two orbital configurations for Global Navigation Satellite System radio occultation (RO) observations in numerical weather prediction using observing system simulation experiments (OSSE). Three experiments are carried out: a Control experiment with no RO observations and two experiments with 14,000 RO
Nikki C. Privé, Christopher Barsoum, Douglas Hunt, Michael J. Murphy, Richard Anthes, William Gullotta, Natalie Laudier   +6 more
wiley   +1 more source