UWB antipodal vivaldi antennas with protruded dielectric rods for higher gain, symmetric patterns and minimal phase center variations

2007 ◽  
Author(s):  
Adel Elsherbini ◽  
Cemin Zhang ◽  
Song Lin ◽  
Michael Kuhn ◽  
Aladin Kamel ◽  
...  
Keyword(s):  
Phase Center ◽  
Phase Center Variations ◽  
Vivaldi Antennas ◽  
Minimal Phase ◽  
Symmetric Patterns

scholarly journals Phase Errors Simulation Analysis for GNSS Antenna in Multipath Environment

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Lixun Li ◽  
Baiyu Li ◽  
Huaming Chen ◽  
Feixue Wang
Keyword(s):  
Circular Polarization ◽  
Simulation Analysis ◽  
Phase Center ◽  
Left Hand ◽  
Phase Errors ◽  
Reflection Model ◽  
Phase Center Variations ◽  
Multipath Signals ◽  
Improved Model ◽  
The Impact

High-precision GNSS application requires the exact phase center calibration of antenna. Various methods are published to determine the locations of the phase center. In the outfield, when the phase errors that arose by multipath exceed the phase center variations (PCV) tolerance, the calibration values may be not useful. The objective of this paper is thus to evaluate the phase errors that arose by multipath signals. An improved model of antenna receiving signal is presented. The model consists of three main components: (1) an antenna model created by combination of right hand circular polarization (RHCP) and left hand circular polarization (LHCP), (2) a multipath signals model including amplitude, phase, and polarization, and (3) a ground reflection model applying to circular polarization signals. Based on the model, two kinds of novel up-to-down(U/D)ratios are presented. The performance of the model is assessed against the impact of up-to-down ratio of antenna on phase errors.

Impact of GPS antenna phase center variations on precise orbits of the GOCE satellite

2011 ◽  
Vol 47 (11) ◽  
pp. 1885-1893 ◽  
Author(s):  
H. Bock ◽  
A. Jäggi ◽  
U. Meyer ◽  
R. Dach ◽  
G. Beutler
Keyword(s):  
Phase Center ◽  
Antenna Phase ◽  
Antenna Phase Center ◽  
Phase Center Variations ◽  
Gps Antenna ◽  
Goce Satellite

scholarly journals The Effect of TLS Radome on GNSS Precise Positioning

2019 ◽  
Vol 94 ◽  
pp. 03012
Author(s):  
Dhota Pradipta ◽  
Dudy D. Wijaya ◽  
Heri Andreas ◽  
Dina A. Sarsito
Keyword(s):  
Data Processing ◽  
Significant Influence ◽  
Noise Level ◽  
Double Difference ◽  
Minor Phase ◽  
Raw Data ◽  
Phase Center ◽  
Precise Positioning ◽  
Systematic Effects ◽  
Phase Center Variations

This article presents the results of a test carried out to check the usability of spherical TLS targets as GNSS antenna radomes (herein called TLS radomes). On different days, the survey was conducted using two GNSS antennas, one of them with a TLS radome. Measurements were made using 2 roof pillars on the rooftop as base-rover pillars with little obstruction. The measurements were carried out for approximately 1 hour in every scenario. The software used for data processing is MATLAB-based software and the raw data were processed using the double difference (DD) strategy to obtain optimal results. The results of the data processing indicated that the TLS radome has no significant influence on availability and accuracy of estimated position. The signals are slightly attenuated by the radome (1-2 dBHz) and the noise level is slightly increased but both effects are negligible for practical purposes. However, we found that the antenna should be calibrated with the TLS radome to clarify apparent minor phase center eccentricities (1-2 mm) and to reduce systematic effects with long periods (few minutes) and amplitudes up to about 5 mm which are likely due to phase center variations.

A New Approach for Field Calibration of Absolute GPS Antenna Phase Center Variations

Navigation ◽  
1997 ◽  
Vol 44 (2) ◽  
pp. 247-255 ◽  
Author(s):  
GERHARD WÜBBENA ◽  
MARTIN SCHMITZ ◽  
FALKO MENGE ◽  
GÜNTER SEEBER ◽  
CHRISTOF VÖLKSEN
Keyword(s):  
Phase Center ◽  
New Approach ◽  
Field Calibration ◽  
Antenna Phase ◽  
Antenna Phase Center ◽  
Phase Center Variations ◽  
Gps Antenna

scholarly journals Determinação dos coeficientes dos harmônicos esféricos para o cálculo dos parâmetros pcv e pco utilizando dados de programas comerciais de calibração

2014 ◽  
Vol 20 (2) ◽  
pp. 444-466 ◽  
Author(s):  
Luiz Fernando Macedo Morescki Junior ◽  
Luiz Danilo Damasceno Ferreira
Keyword(s):  
Phase Center ◽  
Para Determinar ◽  
Phase Center Variations

Erros provenientes do centro de fase da antena, conhecidos como PCV - Phase Center Variations - são considerados agentes limitadores da acurácia do posicionamento relativo GNSS e do Posicionamento por Ponto Preciso (PPP). As PCVs dependem da direção do sinal do satélite e podem ser modeladas por parâmetros determinados por calibração de antenas em que são utilizados programas específicos, como por exemplo Wasoft/Kalib. Alguns autores afirmam que os programas aplicam funções harmônicas esféricas para a modelagem dos parâmetros PCV, mas não informam quais coeficientes são adotados para que a modelagem seja alcançada. Nesta pesquisa, são utilizados os parâmetros PCV de calibração determinados pelo programa comercial WaSoft/Kalib para a antena LEIAX 1202GG. O objetivo principal é calcular os coeficientes a nm e b nm da expansão em funções harmônicas esféricas. Os coeficientes são utilizados para determinar novos parâmetros PCV e PCO que são comparados aos parâmetros obtidos pelo programa comercial Wasoft/Kalib. Os novos parâmetros e os parâmetros calibrados são utilizados para determinar as coordenadas geodésicas de dois pontos com o objetivo de serem comparadas. Foram realizados testes para duas linhas de base diferentes e os resultados confirmam diferenças submilimétricas para as PCVs e milimétricas para a componente vertical do vetor PCO.

Tests of phase center variations of various GPS antennas, and some results

GPS Solutions ◽  
2002 ◽  
Vol 6 (1-2) ◽  
pp. 18-27 ◽  
Author(s):  
Gerhard W�bbena ◽  
Gerald Boettcher ◽  
Martin Schmitz
Keyword(s):  
Phase Center ◽  
Phase Center Variations
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