Flow Birefringence Studies: Line–of–sight propagation of the mean Stokes vector in a turbulent moving fluid showing optical anisotropy

1981 ◽  
Vol 28 (6) ◽  
pp. 833-842
Author(s):  
B.S. Prade
Keyword(s):  
Optical Anisotropy ◽  
Flow Birefringence ◽  
Line Of Sight ◽  
Stokes Vector ◽  
Line Of Sight Propagation ◽  
The Mean ◽  
Moving Fluid

IMU-Aided Dual-Frequency RFID Based Localization in LOS/NLOS Hybrid Environment

2017 ◽  
Author(s):  
Jie Wu ◽  
MingHua Zhu ◽  
Bo Xiao ◽  
Wei He
Keyword(s):  
Indoor Localization ◽  
Measurement Unit ◽  
Line Of Sight ◽  
Dual Frequency ◽  
Site Survey ◽  
Line Of Sight Propagation ◽  
The Mean ◽  
Position Precision ◽  
Rf Signal ◽  
Non Line Of Sight

The mitigation of NLOS (non-line-of-sight) propagation conditions is one of main challenges in wireless signals based indoor localization. When RFID localization technology is applied in applications, RSS fluctuates frequently due to the shade and multipath effect of RF signal, which could result in localization inaccuracy. In particularly, when tags carriers are walking in LOS (line-of-sight) and NLOS hybrid environment, great attenuation of RSS will happen, which would result in great location deviation. The paper proposes an IMU-assisted (Inertial Measurement Unit) RFID based indoor localization in LOS/NLOS hybrid environment. The proposed method includes three improvements over previous RSS based positioning methods: IMU aided RSS filtering, IMU aided LOS/NLOS distinguishing and IMU aided LOS/NLOS environment switching. Also, CRLB (Cramér-Rao Low Bound) is calculated to prove theoretically that indoor positioning accuracy for proposed method in LOS/NLOS mixed environment is higher than position precision of only use RSS information. Simulation and experiments are conducted to show that proposed method can reduce the mean positioning error to around 3 meters without site survey.

The flow birefringence and optical anisotropy of poly(chlorohexyl isocyanate) molecules

1978 ◽  
Vol 20 (6) ◽  
pp. 1400-1406
Author(s):  
I.N. Shtennikova ◽  
T.V. Peker ◽  
Yu.P. Getmanchuk ◽  
V.A. Kudrenko
Keyword(s):  
Optical Anisotropy ◽  
Flow Birefringence

scholarly journals Doppler Shift of Radio Signals Transmitted between Orbiting Satellites

1982 ◽  
Vol 35 (2) ◽  
pp. 155 ◽  
Author(s):  
PL Dyson ◽  
JA Bennett
Keyword(s):  
Electron Concentration ◽  
Doppler Shift ◽  
Rate Of Change ◽  
Line Of Sight ◽  
Concentration Gradients ◽  
Mean Velocity ◽  
Radio Signals ◽  
The Mean ◽  
The Moment ◽  
The Individual

A general expression, applicable at VHF and above, is derived for the Doppler shift of radio signals transmitted between two satellites embedded in the ionosphere. The Doppler shift is made up of several contributions which depend on (a) the rate of change of the free space path between the satellites, (b) the components, perpendicular to the line of sight between the satellites, of both the mean velocity of the satellites and the electron concentration gradients, (c) the moment of the perpendicular electron concentration gradients and the deviations from the mean of the individual satellite perpendicular velocities, (d) the velocity components along the line of sight between the satellites, and the electron concentration values at each satellite, and (e) changes occurring in the ionosphere with time.

Variations in the Mean Line of Sight Velocity of the Sun: 1976 – 1985

1988 ◽  
pp. 215-218 ◽  
Author(s):  
A. Jiménez ◽  
P. L. Pallé ◽  
C. Régulo ◽  
T. Roca Cortés ◽  
Y. P. Elsworth ◽  
...  
Keyword(s):  
Line Of Sight ◽  
The Sun ◽  
The Mean
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