Planar Near-Field Measurements on Radiometer Antennas up to 183 GHz for the Global Precipitation Measurement Satellite

Authors: Andrew Shroyer, Ray Lovestead and Eric Darnel
Publication: AMTA 2010
Copyright Owner: NSI-MI Technologies

The Global Precipitation Measurement (GPM) mission is a satellite based Earth science mission that will study the global precipitation from rain, ice and snow. A critical part of this satellite is the multifrequency radiometer system that covers frequencies up to 183 GHz. Beam pointing and beam efficiency must be measured very accurately to calibrate the radiometer response. This paper will focus on the measurements of the offset reflector antenna operating up to 183 GHz using a Nearfield Systems Inc. (NSI) planar near-field measurement system and the special challenges that this presents. Results will be presented and the uncertainty in beam pointing will be discussed.

Some Detailed Implementation Aspects of an Automated Error Assessment Scheme for Antenna Spherical Near-Field Measurements

Authors: Patrick Pelland, Daniël Janse van Rensburg, Derek McNamara, Leili Shafai, Shantnu Mishra, Minya Gavrilovic
Publication: AMTA 2010
Copyright Owner: NSI-MI Technologies

This paper elaborates on certain aspects of a new measurement process that permits an assessment of spherical near-field (SNF) measurement errors based on a set of practical tests that can be done as part of any SNF measurement. It provides error bars for a measured radiation pattern in an automated fashion.

Standard Gain Horn Computations Versus Measured Data

Author: Donald G. Bodnar
Publication: ANTEM 2010
Copyright Owner: IEEE

Specially designed pyramidal horn antennas known as standard-gain horns are accepted as gain standards throughout the antenna community. The unknown gain of an AUT is determined by comparing its gain to that of a standard gain horn. Slayton of the US Naval Research Laboratory in 1954 developed a design method and gain curves for standard gain horns. This paper examines the ability of modern numerical electromagnetic modeling to predict the gain of these horns and possibly achieve greater accuracy than with the NRL approach.

You have requested a Reprint of an IEEE Paper

Copyright 2010 IEEE. Reprinted from 2010 Antenna Measurement Conference, ANTEM 2010, July 5-9, 2010, Ottawa, Canada.

This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of NSI-MI Technologies' products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org.

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The Measurement of Monopulse Tracking Nulls in a Planar Near-field Antenna Range

Authors: Daniël Janse van Rensburg, Pieter Betjes
Publication: ANTEM 2010
Copyright Owner: IEEE

Monopulse antennas typically have a sum and two difference channels allowing for the accurate tracking of radar targets. Measuring the radiation patterns of these three channels often include establishing the electrical boresight of the antenna. Planar near-field test systems allow for the accurate determination of difference pattern nulls and locations. In this paper we present an iterative process requiring the use of all three channels to achieve an accurate null depth and location result. The impact of near-field truncation on the boresight pointing angle is also addressed and achievable accuracy numbers are presented.

You have requested a Reprint of an IEEE Paper

Copyright 2010 IEEE. Reprinted from 2010 Antenna Measurement Conference, ANTEM 2010, July 5-9, 2010, Ottawa, Canada.

This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of Nearfield Systems, Inc.'s products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org.

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Towards Routine Automated Error Assessment in Antenna Spherical Near-Field Measurements

Authors: Patrick Pelland, Jonathan Ethier, Daniël Janse van Rensburg, Derek McNamara, Leili Shafai, Shantnu Mishra
Publication: EuCAP 2010
Copyright Owner: IEEE

This paper describes a measurement process that permits an assessment of spherical near-field (SNF) measurement errors based on a set of tests that can be done as part of any SNF measurement. A test system has been implemented that, in an automated fashion, derives error bars for the measured radiation patterns.

You have requested a Reprint of an IET Paper

You have requested a Reprint of an IEEE Paper

Copyright 2010 IEEE. Reprinted from EuCAP 2010 Conference.

This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of NSI-MI Technologies' products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org.

By choosing to view this document, you agree to all provisions of the copyright laws protecting it.


Use of Time Domain Gating in Spherical Near-Field Measurements

Author: Jeffrey Fordham
Publication: ANTEM 2010
Copyright Owner: IEEE

Time domain gating has been widely used in antenna measurements for many years. The technique has proven useful in gating out extraneous signals from the range that can be uniquely separated from the primary desired signal. The well known process involves collecting data in the frequency domain and then transforming the data to the time domain for processing. In far-field antenna measurements the technique is limited in its applicability by factors such as antenna bandwidth and pattern shape vs. frequency, and internal time delays within the device under test. Spherical near-field presents additional challenges to the effective use of time domain gating.

These challenges of performing time domain gating in spherical near-field measurements are presented along with measured results from a small spherical near-field range. These results show the significant reduction in stray signals and the resulting increase in accuracy that can be achieved via time domain gating.

Finally, the paper concludes with measurements made on a large spherical near-field arch over a ground plane system. Additional challenges of such a system will be highlighted.

You have requested a Reprint of an IEEE Paper

Copyright 2010 IEEE. Reprinted from 2010 Antenna Measurement Conference, ANTEM 2010, July 5-9, 2010, Ottawa, Canada.

This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of NSI-MI Technologies' products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org.

By choosing to view this document, you agree to all provisions of the copyright laws protecting it.


Laboratory Results on the Compensation of Probe Positioning Errors in the NF-FF Transformation with Helicoidal Scan

Authors: F. D’Agostino, F. Ferrara, C. Gennarelli, R. Guerriero, M. Migliozzi, Jeff Fordham
Publication: AMTA 2010
Copyright Owner: University of Salerno

The science of spiral scanning techniques have been advancing for a number of years at the University of Salerno.

Experimental validation of the technique has been presented in the past couple of years validating the techniques.

This latest work shows the ability to compensate for known residual errors in the probe position.

You have requested a Reprint of a University of Salerno Paper

Copyright 2010 The University of Salerno. Reprinted from AMTA 2010 Conference

This material is posted here with permission of the University of Salerno. Such permission of the University of Salerno does not in any way imply University of Salerno endorsement of any of NSI-MI Technologies' products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the University of Salerno.

By choosing to view this document, you agree to all provisions of the copyright laws protecting it.


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