Results 211 to 220 of about 28,666 (254)
Some of the next articles are maybe not open access.
Angle-of-arrival fluctuations in a turbulent atmosphere
The Journal of the Acoustical Society of AmericaAtmospheric turbulence causes fluctuations in the angle-of-arrival (AOA) of sound waves. These fluctuations adversely affect the performance of sensor arrays used for source detection, ranging, and recognition. This article examines, from a theoretical perspective, the variance of the AOA fluctuations measured with two microphones.
Vladimir E. Ostashev +6 more
openaire +2 more sources
On the Arrival Angle of Microwaves
1949This research describes a preliminary effort to measure the effect of the atmosphere on the refraction of microwaves. Variations in the structure of the lower atmosphere cause small changes in the index of refraction, and these small changes might alter the angle at which the wave front arrives at the receiver.
openaire +1 more source
2004
The angle of arrival (AOA) is the most valuable piece of information that can be obtained from an enemy radar because the radar cannot change its position drastically in a very short time frame (i.e., a few milliseconds). Unfortunately AOA information is also the most difficult information to obtain. It requires several antennas with receivers. The two
openaire +1 more source
The angle of arrival (AOA) is the most valuable piece of information that can be obtained from an enemy radar because the radar cannot change its position drastically in a very short time frame (i.e., a few milliseconds). Unfortunately AOA information is also the most difficult information to obtain. It requires several antennas with receivers. The two
openaire +1 more source
Angle-of-Arrival Estimation for UWB Signals Clustered in Angle
2006 1st International Symposium on Wireless Pervasive Computing, 2006In this study, the new signal model suitable for ultrawide band (UWB) environments with random angle spread is proposed to estimate the angle-of-arrivals (AOAs) of clusters in a UWB indoor or indoor-to-outdoor wireless communication. The estimation technique based MUSIC algorithm is investigated and the estimates of the AOA and distribution parameter ...
null Yong Up Lee +2 more
openaire +1 more source
Arrival angle estimation in non-Gaussian noise
Proceedings of ICASSP '94. IEEE International Conference on Acoustics, Speech and Signal Processing, 2002This paper considers the problem of estimating the direction of arrival of plane waves from sensor array data. It is shown through a multivariate generalization of Whittle's inequality that the least squares estimator and its subspace-based approximations are inefficient when the noise distribution is non-Gaussian.
Debasis Sengupta, Sarbani Palit
openaire +1 more source
On Angle-of-Arrival and Time-of-Arrival Statistics of Geometric Scattering Channels
IEEE Transactions on Vehicular Technology, 2009This paper proposes a hyperbolic distribution to model the distribution of random scatterers between a base station (BS) and the user equipment (UE) in multipath mobile environments. New hyperbolic angle-of-arrival (AoA) probability density function (pdf), power azimuth spectrum (PAS), time-of-arrival (ToA) pdf, and power delay spectrum (PDS) are ...
openaire +2 more sources
A New CLEAN Algorithm for Angle of Arrival Denoising
IEEE Antennas and Wireless Propagation Letters, 2009In a previous work, a novel technique for angle of arrival (AOA) measurement was proposed. This technique consists of sweeping the angular domain with one antenna, step by step, such that at each measurement step the received signal voltage at the rotating antenna (sensor) is measured.
Akhdar, Oussama +4 more
openaire +2 more sources
A Method of Determining the Angle of Arrival
Journal of Applied Physics, 1948A method is presented for determining the angle of arrival of the direct and reflected wave for line of sight cases. The method assumes one direct and one reflected wave. The phase difference equipment, as developed by the Electrical Engineering Research Laboratory, measures the difference in phase at 3.2-cm wave-length between two points separated ...
A. W. Straiton +2 more
openaire +1 more source
Measurement of Angle-of-Arrival
1969While 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
Comparison of two angle of arrival averaging strategies
2009 Canadian Conference on Electrical and Computer Engineering, 2009The accuracy of direction finding (DF) systems can often be improved by using techniques for the time averaging of information from multiple data records, particularly when the signal-to-noise ratio is low. In certain DF systems, the emitter angle of arrival (AOA) is computed from the phase angle of a complex-valued signal. For this type of DF systems,
Sichun Wang +3 more
openaire +1 more source