Results 241 to 250 of about 284,216 (291)
Some of the next articles are maybe not open access.
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
A simple technique for angle of arrival measurement
2008 IEEE Antennas and Propagation Society International Symposium, 2008A simple method to calculate the angle of arrival is presented in this paper. The advantages of this method are the unlimited number of the detected angle of arrival in hand and the fact that we donpsilat need to know the nature of the radiating sources in the other hand. However, some disadvantages have been seen.
Akhdar, Oussama +3 more
openaire +2 more sources
Angle-of-arrival statistics for low resolution antennas
IEEE Transactions on Antennas and Propagation, 2002In a scattering environment, the propagation paths to a receiving antenna arrive from a certain angular spread of directions. For a low-resolution antenna, an apparent direction of arrival may be defined as the azimuth direction of maximum power. A small array is used as the antenna and the spatial derivative of the phase along the array axis is taken ...
Andersen, Jørgen Bach +1 more
openaire +2 more sources
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
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 measurements of ionospheric irregularities
Canadian Journal of Physics, 1987Recent 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 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
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
2011 5th International Conference on Signal Processing and Communication Systems (ICSPCS), 2011
This paper introduces a novel simplistic geometrical disk scattering model in which the local scatterers are uniformly distributed in polar coordinates within a disk centered on the mobile station (MS). The proposed joint uniform distribution in polar coordinates results in a higher concentration of scatterers around the disk center and a lower ...
Alireza Borhani, Matthias Patzold
openaire +1 more source
This paper introduces a novel simplistic geometrical disk scattering model in which the local scatterers are uniformly distributed in polar coordinates within a disk centered on the mobile station (MS). The proposed joint uniform distribution in polar coordinates results in a higher concentration of scatterers around the disk center and a lower ...
Alireza Borhani, Matthias Patzold
openaire +1 more source
Radar Angle-of-Arrival Estimation
2013The 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 estimation using spectral interferometry
Journal of Luminescence, 2010We have developed a correlative signal processing concept based on a Mach-Zehnder interferometer and spatial-spectral (S2) materials that enables direct mapping of RF spectral phase as well as power spectral recording. This configuration can be used for precise frequency resolved time delay estimation between signals received by a phased antenna array ...
Z.W. Barber +4 more
openaire +1 more source