Results 291 to 300 of about 61,990 (319)

RF angle of arrival-based node localisation

International Journal of Sensor Networks, 2011
Several localisation algorithms exist for wireless sensor networks that use angle of arrival measurements to derive node position. However, there are limited options for actually obtaining the angle of arrival using resource-constrained devices. In this paper, we describe a technique for determining node bearings based on radio interferometric angle of
Isaac Amundson, Janos Sallai, Xenofon Koutsoukos, Akos Ledeczi, Miklos Maroti   +4 more
openaire   +1 more source

Radar Angle-of-Arrival Estimation

2013
The paper focus on interferometer angle error and on the signal processing required for interferometry, but also introduce monopulse angle-of-arrival for comparison. This chapter, derive the basic equations for monopulse angle estimation and discuss the fundamentals of eigen-based superresolution techniques.
openaire   +1 more source

Angle of Arrival of Z Echoes

Nature, 1953
IT has been suggested by Scott1 that uncoupled F-region Z echoes are due to longitudinally propagated waves reflected from an area near the magnetic zenith.
openaire   +1 more source

Angle-of-arrival estimation in atmospheric turbulence

The Journal of the Acoustical Society of America, 2005
An angle-of-arrival estimator is derived for acoustic waves that propagate in atmospheric turbulence. The estimator directly accounts for the effects of random fluctuations in the propagation environment. The first and second moments of the sound field, as derived from the theory of wave propagation in a random medium, and realistic atmospheric ...
Sandra Collier, Vladimir Ostashev, D. Keith Wilson   +2 more
openaire   +1 more source

Measurement of Angle-of-Arrival

1969
While a large number of different types of direction-finder for obtaining the bearings of radio signals have been developed, ranging from simple vertical loop antennas to very complicated systems such as the Wullenweber type in which a narrow beam is used to scan the incoming wave system, very few of them can be applied to the problem of measuring ...
openaire   +1 more source

Cooperative localization using angle-of-arrival information

11th IEEE International Conference on Control & Automation (ICCA), 2014
This paper studies the cooperative localization problem of sensor networks using local angle-of-arrival measurements in two scenarios. (i) The angle-of-arrival information can be mutually measured by pairs of sensors in their local frames which do not share the same orientation; (ii) The angle-of-arrival information can not be mutually measured by ...
Jubin Zhong, Zhiyun Lin, Zhiyong Chen, Wenyuan Xu   +3 more
openaire   +1 more source

Angle of Arrival Estimation Through a Full-Hardware Approach for Adaptive Beamforming

IEEE Transactions on Circuits and Systems - II - Express Briefs, 2020
This brief introduces a full-hardware approach for Angle of Arrival (AoA) estimation in phased array antennas. The system has a modular structure composed of an analog section to up/down-convert RF signals and a digital section for the AoA estimation ...
G. Avitabile, A. Florio, G. Coviello
semanticscholar   +1 more source

Angle-of-arrival measurements of ionospheric irregularities

Canadian Journal of Physics, 1987
Recent improvements in instrumentation permit sufficient resolution in angular-deviation measurements to yield information on the shape of irregularities. The expected deviation imposed upon very high frequency signals from an orbiting satellite by an irregularity with a Gaussian electron-density distribution is modelled.
E. Griffioen, G. F. Lyon
openaire   +1 more source

Angle-of-Arrival Estimation Using an Adaptive Machine Learning Framework

IEEE Communications Letters, 2019
Angle-of-arrival (AoA) estimation is of great interest, particularly for using radio to localize a device; good estimates of angles result in good estimates of location.
Aftab Khan, Stephen Wang, Ziming Zhu
semanticscholar   +1 more source

Interferometer Angle-of-Arrival Error Effects

2013
The angle error equations derived to this point have reflected only the error performance due to thermal noise effects. However, angle-of-arrival performance can be affected by various sources of error other than thermal noise. In this chapter, we focus on errors that affect angle accuracy as opposed to angle precision.
openaire   +1 more source