Results 171 to 180 of about 104,320 (215)
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Evaluation of Millimeter-Wave Line-of-Sight Probability With Point Cloud Data
IEEE Wireless Communications Letters, 2016Line-of-sight (LOS) probability is an integral part of radio channel models for cellular network design and evaluation. The probability along with the pathloss models in LOS and non-LOS scenarios gives us an estimate of the cellular coverage. In this letter, we present a novel method to evaluate the LOS probability by using point cloud data obtained ...
Nguyen, Sinh L H +5 more
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Adaptive Friction Compensation for Line-of-Sight Pointing and Stabilization
1993 American Control Conference, 1993This paper presents a new and practical adaptive friction compensation (AFC) technique developed at Texas Instruments for either analog or digital implementation. AFC is designed to augment conventional stabilization rate loops for the purpose of adapting to the characteristics of friction and canceling its torque disturbances before they cause LOS ...
Benigno Maqueira, Michael K. Masten
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Algorithms for determination of reflection point for line-of-sight systems
Proceedings of IEEE Singapore International Conference on Networks/International Conference on Information Engineering '93, 2002The determination of the reflection point is critical in the design of line-of-sight radio links. Various methods and procedures were proposed many years ago when long manual computations were difficult and fast digital computers were not available. This paper reviews the methods used and considers several algorithms. The solutions obtained are studied
J.-T. Ong, T.C. Chiam
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Small-Cell Wireless Backhauling: A Non-Line-of-Sight Approach for Point-to-Point Microwave Links
2012 IEEE Vehicular Technology Conference (VTC Fall), 2012In this paper we investigate the feasibility of using microwave frequencies for fixed non-line-of-sight wireless backhauling connecting small-cell radio base stations with an aggregation node in an outdoor urban environment, i.e. a typical heterogeneous network scenario.
Mikael Coldrey +6 more
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Perceptual and Motor Skills, 1977
Near-point and far-point binocular and monocular sighting tests given 240 high and low achievers from regular classrooms at Grades 4, 8, and 12 yielded significant differences by χ 3 in distributions of near-point binocular sighting only. Twelfth-grade subjects were significantly different on
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Near-point and far-point binocular and monocular sighting tests given 240 high and low achievers from regular classrooms at Grades 4, 8, and 12 yielded significant differences by χ 3 in distributions of near-point binocular sighting only. Twelfth-grade subjects were significantly different on
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Point-to-point transmissions, terrestrial line-of-sight links, terrestrial troposcatter links
1994This chapter will deal with microwave links (radio relay links), the technology of which is founded on the possibilities offered by the very high frequencies, 1 GHz ). > 3 mm. These two aspects make it possible to obtain both wide passbands and a very directive radiation, particularly suitable for transmitting large quantities of signals or data from ...
Philippe Magne +3 more
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Siderostat pointing: validation of an advanced line-of-sight pointing concept beyond LISA
Classical and Quantum GravityAbstract We present a mechanism prototype for a previously proposed advanced pointing concept for a Laser Interferometer Space Antenna-like space-based gravitational wave observatory that enables an architecture with two bi-directional interferometric laser links per S/C referenced to a single active test mass.
Nils Frederik Hasselmann +6 more
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Gyroless line-of-sight stabilization for pointing and tracking systems
Optical Engineering, 1994A new platform stabilization approach is described where miniature, low-cost, linear accelerometers are used (instead of gyroscopes) for line-of-sight (LOS) stabilization. This is accomplished by placing the accelerometers at strategic locations and combining their outputs so that angular motion is determined from linear acceleration measurements.
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Overflow, first-sight, and vanishing point distances in visual imagery.
Journal of Experimental Psychology: Learning, Memory, and Cognition, 1988The relationship between the size of a familiar object and the distances at which it is imaged is examined in three experiments. The distance at which an imaged object overflows the visual field is linearly related to object size, a result consistent with the size-distance invariance hypothesis (Kosslyn, 1980).
T L, Hubbard, J C, Baird
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Statistical Analysis and Verification of the Satellite Line of Sight Pointing Jitter
2010 First International Conference on Pervasive Computing, Signal Processing and Applications, 2010A method of statistical analysis and verification of the satellite line of sight jitter is discussed. For the case that the jitter measurement is random, the verification of jitter is achieved by estimate the probability that the jitter requirement is not met.
Dong De-zhi +3 more
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