Effect of antenna phase centre displacement on FM-CW measurements: application to radar system

2003 ◽  
Vol 39 (11) ◽  
pp. 867 ◽  
Author(s):  
C. Barès ◽  
C. Brousseau ◽  
L. Le Coq ◽  
A. Bourdillon
Keyword(s):  
Radar System ◽  
Antenna Phase ◽  
Antenna Phase Centre

scholarly journals Antenna Phase Error Compensation for Terahertz Coded-Aperture Imaging

Electronics ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 628
Author(s):  
Xingyue Liu ◽  
Chenggao Luo ◽  
Fengjiao Gan ◽  
Hongqiang Wang ◽  
Long Peng ◽  
...  
Keyword(s):  
Error Compensation ◽  
Phase Error ◽  
Radar System ◽  
Coded Aperture ◽  
Aperture Antenna ◽  
Imaging Radar ◽  
Phase Errors ◽  
Coded Aperture Imaging ◽  
Imaging Model ◽  
Antenna Phase

Coded-aperture antenna plays an important role in terahertz coded-aperture imaging radar system. However, the performance of a system is inevitably affected by the phase errors introduced by the coded-aperture antenna elements. In this paper, we propose a phase error compensation method by deducing a formula to compute all element phase errors accurately. According to the formula, the phase errors can be calibrated by using a calibrator and can be used to compensate the imaging model of the system. Numerical simulations demonstrate that the proposed method can effectively improve the imaging quality when the elemental phase error exceeds 10 ∘ .

scholarly journals A PROPOSED SIMPLIFIED TECHNIQUE FOR CONFIRMING HIGH PRECISION GNSS ANTENNA OFFSETS

Aviation ◽  
2010 ◽  
Vol 14 (3) ◽  
pp. 83-89
Author(s):  
Vilma Zubinaitė ◽  
George Preiss
Keyword(s):  
High Precision ◽  
Reasonable Agreement ◽  
The Other ◽  
Three Dimensions ◽  
Great Effort ◽  
Antenna Phase ◽  
Simplified Procedure ◽  
Antenna Phase Centre ◽  
Gnss Observations ◽  
Calibration Parameters

The purpose of this research was to independently investigate and determine confirmatory calibration procedures for GNSS antennas. This paper focuses on the aspect of simplified techniques for confirming high precision GNSS antenna offsets. In the other words, the aim is to verify GNSS antenna offset parameters ‐ results, which will be used to find the consequences on ground positions of orbital distortions caused by solar activity. It is well known that the computation of GNSS observations using high precision GNSS antennas requires knowledge of the relevant antenna phase centre offsets. These offsets are the distance in three dimensions from the antenna's physical centre to the point in space at which the antenna ‘measures’ position. The calibration processes used by manufacturers appear to vary, and, where receivers of different models are to be used together, it is essential that the calibration parameters used are all produced using the same methods and by the same authoritative sources. Meanwhile, with the growth in the use of high precision GNSS systems, the likelihood of antennas being accidentally mishandled is possibly higher than previously. Finally, it is noted that it has long been the practise for surveyors to check their instruments to ensure that they are properly calibrated. In the modern electronic age, however, it seems that this practise has been allowed to lapse as far as GNSS instrumentation is concerned. With the above in mind, it has been decided to attempt to create a simplified procedure for calibrating high precision GNSS antennas. The aim is that it will be possible for the average surveyor to check his antenna without great effort or trouble. The objective can also be described as finding a simplified field procedure to determine whether a specific antenna's offset parameters are within reasonable agreement with published figures. Santrauka Straipsnyje analizuojamas supaprastintas metodas, kuriuo galima aprobuoti aukšto tikslumo globalines navigacines palydovines sistemos (GNPS) antenos nukrypimus. Siekiama patinkrinti GNPS antenos nukrypimo parametrus ‐ rezultatus, kurie bus naudojami nustatant GNPS palydovo orbitos iškraipymu padarinius. Nagrinejama procedūra, kai siekiama nustatyti, ar konkrečios GNPS antenos kalibravimo parametrai yra pagristi, palyginti su publikuotais duomenimis. Analizuojama problema yra aktuali, kai GNPS matavimams naudojamos aukšto tikslumo GNPS antenos ir reikalingos žinios, susijusios su antenos fazes centro nukrypimais.

scholarly journals Height Variation Depending on the Source of Antenna Phase Centre Corrections: LEIAR25.R3 Case Study

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 4010 ◽  
Author(s):  
Andrzej Araszkiewicz ◽  
Damian Kiliszek ◽  
Anna Podkowa
Keyword(s):  
Satellite System ◽  
International Gnss Service ◽  
Phase Center ◽  
Antenna Phase ◽  
Antenna Phase Center ◽  
The Stability ◽  
Global Navigation Satellite ◽  
Antenna Phase Centre ◽  
The Impact

In this study, we compared two sets of antenna phase center corrections for groups of the same type of antenna mounted at the continuously operating global navigation satellite system (GNSS) reference stations. The first set involved type mean models provided by the International GNSS Service (release igs08), while the second set involved individual models developed by Geo++. Our goal was to check which set gave better results in the case of height estimation. The paper presents the differences between models and their impact on resulting height. Analyses showed that, in terms of the stability of the determined height, as well as its variability caused by increasing the facade mask, both models gave very similar results. Finally, we present a method for how to estimate the impact of differences in phase center corrections on height changes.

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