scholarly journals Dynamic Correction of the Influence of Long Measuring Path Irregularity in Antenna Tests

2021 ◽  
Vol 11 (17) ◽  
pp. 8183
Author(s):  
Elena Dobychina ◽  
Mikhail Snastin
Keyword(s):  
Reflection Coefficient ◽  
Error Correction ◽  
Dynamic Error ◽  
Beam Shaping ◽  
Theoretical Background ◽  
Dynamic Correction ◽  
Electrical Length ◽  
Mathematical Expressions ◽  
Electronically Scanned Arrays ◽  
Dynamic Measuring

This article investigates the influence of random microwave discontinuities on the characteristics of long transmission paths. This is most important for dynamic measuring stands, accompanied by multiple space movement of long transmission paths with their bending or twisting during the measurement process. In modern active electronically scanned arrays this issue also becomes relevant, due to increased requirements for the accuracy of beam shaping. The aim of this study is to develop a theoretical background and perform experimental verification for taking into account the effect of random microwave discontinuities on the transmission path characteristics. A method for correcting the effect of such irregularities is considered based on electrical length control by measuring the input reflection coefficient. Relations for the magnitude and phase of the path’s input reflection coefficient depending on the S-parameters of a long four-terminal network terminated with mismatched load are obtained and plotted. Using theory of sensitivity, the mathematical expressions of conditions were obtained to achieve maximum accuracy of measuring the electrical length of a long microwave path. The possibility of dynamic error correction in antenna measurements with a long test path caused by random microwave irregularities along it has been experimentally proved.

Measuring Dynamic Sales Impacts of LBA Using Wireless Communication Technology

2013 ◽  
Vol 662 ◽  
pp. 896-901
Author(s):  
Zong Jin Liu ◽  
Yang Yang ◽  
Zheng Fang ◽  
Yan Yan Xu
Keyword(s):  
Wireless Communication ◽  
Error Correction ◽  
Communication Technology ◽  
Dynamic Error ◽  
Rapid Development ◽  
Vector Autoregressive ◽  
Vector Error Correction ◽  
Vector Error ◽  
Equilibrium Relationship

Because of rapid development of wireless communication technology, there is an increasing adoption of mobile advertising, such as location based advertising (LBA). To what extent can LBA improve advertising effectiveness is an important topic in the field of wireless communication technology research. Most researches quantify long term impacts of advertisings by VAR (Vector Autoregressive) model. However, compared to VAR model, VECM (Vector Error Correction Model) is a better method in that it allows one to estimate both a long-term equilibrium relationship and a short-term dynamic error correction process. In this study, we employ VECM to explore LBA’s (Location Based Advertising) and PUA’s (Pop-up Advertising) sales impact in both short and long terms. The developed VECM reveals that LBA’s sales impact is about more than2 times as big as PUA’s in short dynamic term and nearly 6 times bigger than PUA’s in long equilibrium term. These findings add to advertising and VECM literatures. These results can give managers more confident to apply wireless communication technology to advertising.

Reflection Coefficient Measurement through the Implementation of Wideband Multi-Port Reflectometer with Error Correction for Microwave Imaging Application of Human Head

2013 ◽  
Vol 64 (3) ◽  
Author(s):  
Rashidah Che Yob ◽  
Norhudah Seman
Keyword(s):  
Reflection Coefficient ◽  
Error Correction ◽  
Human Head ◽  
Correction Method ◽  
Microwave Imaging ◽  
Passive Components ◽  
Power Dividers ◽  
Imaging Application ◽  
Coefficient Measurement ◽  
Design Systems

This article presents the reflection coefficient measurement by using a wideband multi-port reflectometer for microwave imaging application of human head. The configuration of the proposed wideband multi-port reflectometer is formed by passive components, which are four couplers and two power dividers operating from 1 to 6 GHz. The investigation is successfully done through simulation using the Agilent’s Advanced Design Systems (ADS) software and practical measurement in laboratory. An error correction method with three standards of match, open and short load is then applied to the constructed wideband multi-port reflectometer to remove its imperfect characteristics. The wideband characteristics of proposed reflectometer are analyzed and verified across the designated frequency band.  Its operation in reflection coefficient is tested with the chosen device under test (DUT).

Dynamic Error Correction for Magnetic Property Measurement

2020 ◽  
Vol 69 (3) ◽  
pp. 836-844 ◽  
Author(s):  
Carlo Guarnieri Calo Carducci ◽  
Attilio Di Nisio ◽  
Filippo Attivissimo ◽  
Amerigo Trotta
Keyword(s):  
Magnetic Property ◽  
Error Correction ◽  
Dynamic Error ◽  
Property Measurement

Influence of Lateral Shift on Normal Moveout of SH-Wave

2013 ◽  
Vol 838-841 ◽  
pp. 1530-1533
Author(s):  
An Ling Wang ◽  
Fu Ping Liu
Keyword(s):  
Reflection Coefficient ◽  
Data Processing ◽  
Error Correction ◽  
Seismic Data ◽  
Critical Angle ◽  
Large Error ◽  
Lateral Shift ◽  
Angle Of Incidence ◽  
Seismic Data Processing ◽  
Sh Wave

Using the lateral shift and shift time of reflection coefficient of SH seismic wave at the interface of strata, , we derived and given formulae of normal moveout of lateral shift, discussed the influence of lateral shift on normal moveout of SH-wave, and drawn the curves of normal moveout of lateral shift and the error of normal moveout caused by lateral shift with respect to the angle of incidence. The results show that for glancing wave or angle of incidence being near the critical angle, A large error can be caused by t lateral shift; The error correction of lateral shift should be done before seismic data processing.

Dynamic error correction method for time grating CNC rotary table

2010 ◽  
Author(s):  
Xiaokang Liu ◽  
Jiqin Feng ◽  
Fangyan Zheng ◽  
Donglin Peng
Keyword(s):  
Error Correction ◽  
Dynamic Error ◽  
Correction Method ◽  
Rotary Table ◽  
Error Correction Method
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