Time and spatial filtering for echo reduction in antenna measurements

Sierra Castañer, Manuel and González Blanco, María Pilar and López Morales, Manuel José and Saccardi, Francesco and Foged, Lars Jacob (2015). Time and spatial filtering for echo reduction in antenna measurements. In: "Antenna Measurement Techniques Association (AMTA)", 11/10/2015 - 16/10/2015, Long Beach, California, USA. pp. 1-5.

Description

Title: Time and spatial filtering for echo reduction in antenna measurements
Author/s:
  • Sierra Castañer, Manuel
  • González Blanco, María Pilar
  • López Morales, Manuel José
  • Saccardi, Francesco
  • Foged, Lars Jacob
Item Type: Presentation at Congress or Conference (Article)
Event Title: Antenna Measurement Techniques Association (AMTA)
Event Dates: 11/10/2015 - 16/10/2015
Event Location: Long Beach, California, USA
Title of Book: Antenna Measurement Techniques Association (AMTA)
Date: 2015
Subjects:
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Señales, Sistemas y Radiocomunicaciones
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

During the last years, new algorithms, based on time filtering, spatial or modal filtering, have been designed for echo reduction techniques applied to antenna measurements. These algorithms have been used for different applications where the effect of the echoes is important, as far field system, VHF or UHF applications, automotive systems, small antennas, etc. The authors, in previous papers, have analysed the effect of different algorithms: time filtering (fft, non uniform dft or matrix pencial), modal filtering based on Spherical modes (MV-Echo) and spatial filtering based on Integral Equations (Insight) and holographic techniques (fft and dft) to cancel the effect of the reflections. This comparison has been applied to the measurements of a dipole antenna (SD1900) using a StarLab system. It is observed that each of the algorithms is better for different situations, depending on the source of the echo. For instance, time filtering techniques are good for reflections coming from different distances with respect the direct ray, but not so good for close reflections. In addition hey need a large frequency band to work properly. Spatial algorithms can correct the effect of positioners or other structures close to the antenna under test, but they are better for planar near field acquisitions and worse for classical single probe spherical near field where the antenna is rotated and probe is fixed (e.g. roll-over-azimuths systems). Moreover, they require extra information of the AUT geometry. This paper presents first a comparison of each algorithm and then, a combination of time and spatial techniques based on uniform or non-uniform DFT to take advantage of the benefits of each algorithm for different origins of the reflections.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainTEC-2011-28789-C02-01SICOMOROUnspecifiedUnspecified
Madrid Regional GovernmentS2013/ICE-3000SPADERADAR-CMUnspecifiedUnspecified

More information

Item ID: 42261
DC Identifier: http://oa.upm.es/42261/
OAI Identifier: oai:oa.upm.es:42261
Deposited by: Memoria Investigacion
Deposited on: 23 Jul 2016 11:01
Last Modified: 23 Jul 2016 11:01
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