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  • Grating-Lobe Pattern Retrieval from Noisy Irregular Beam Data for the Planck Space Telescope | TICRA
    Scattering Grating Lobe Pattern Retrieval from Noisy Irregular Beam Data for the Planck Space Telescope Abstract In flight measurements of satellite antenna patterns are often given in a highly irregular grid and the data may be influenced by severe noise such that an accurate pat tern determination is difficult In this paper a two step fitting algorithm for retrieval of the antenna pattern will be demonstrated Publication 33rd ESA Antenna

    Original URL path: http://www.ticra.com/papers/grating-lobe-pattern-retrieval-noisy-irregular-beam-data-planck-space-telescope (2016-05-01)
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  • Papers tagged with : Measurement | TICRA
    by TICRA The software reconstructs the field or the equivalent currents on a 02 Jun 2011 An Accurate Technique for Calculation of Radiation From Printed Reflectarrays Authors Min Zhou Stig Busk Sørensen Erik Jørgensen Peter Meincke The accuracy of various techniques for calculating the radiation from printed reflectarrays is examined and an improved technique based on the equivalent currents approach is proposed The 11 Apr 2011 Accurate Fitting of Noisy Irregular Beam Data for the Planck Space Telescope Authors Oscar Borries Per Heighwood Nielsen Accurate fitting of the noisy irregular amplitude only main beam data is essential for the retrieval of the Planck space telescope geometry Therefore a novel two step fit ting algorithm which 11 Apr 2011 Advanced Processing of Measured Fields using Field Reconstruction Techniques Authors Erik Jørgensen Peter Meincke Cecilia Cappellin This contribution deals with the problem of reconstructing the extreme near field of an antenna starting from the field measured at a larger distance The presented method has several applications 10 Oct 2010 Improved In Flight Pattern Retrieval by Reflector Deformation Fitting Authors Frank Jensen Per Heighwood Nielsen The in flight pattern measurements of a sub millimetre space telescope may be improved by determining the actual reflector anomalies and then include the knowledge to these in the final pattern de 12 Apr 2010 An Accurate and Efficient Error Predictor Tool for CATR Measurements Authors Cecilia Cappellin Stig Busk Sørensen An accurate and efficient numerical model is developed to simulate the far field of an antenna under test AUT measured in a Compact Antenna Test Range CATR on the basis of the known quiet 01 Nov 2009 Best Fit Adjustments of the Reflectors in a Compact Range Authors Frank Jensen Per Heighwood Nielsen ESA s Compact Antenna Test Range at ESTEC has been relocated which has given

    Original URL path: http://www.ticra.com/papers/16?page=1 (2016-05-01)
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  • Papers tagged with : Measurement | TICRA
    technique has been developed for the DTU ESA Spherical Near Field Antenna Test Facility at the Technical University of Denmark The technique is based on the 04 Nov 2007 Polarisation Dependent Scattering from the Serrations of Compact Ranges Authors Frank Jensen Serrations are often applied at the edges of compact range reflectors in order to reduce the scattering from the edges into the quiet zone At low frequencies the serrations show different 06 Nov 2006 The Influence of Finite Measurement Accuracy on the SWE to PWE Antenna Diagnostics Technique Authors Cecilia Cappellin A new antenna diagnostics technique based on the transformation of the spherical wave expansion SWE into the plane wave expansion PWE is proposed The new technique allows the recovery of the 31 May 2005 A High Resolution Antenna Diagnostics Technique for Spherical Near Field Measurements Authors Cecilia Cappellin A new diagnostics technique for spherical near field antenna measurements that can provide a high spatial resolution of the reconstructed aperture field is presented This technique is realized 08 Nov 2004 A High Resolution Antenna Diagnostics Technique for Spherical Near Field Antenna Measurements Authors Cecilia Cappellin A new antenna diagnostics technique for spherical near field antenna measurements that is able to provide a high resolution of the reconstructed aperture field in excess of existing techniques 17 Oct 2004 On the Number of Modes in Spherical Wave Expansions Authors Frank Jensen Since the early days of spherical near field far field transformations a recommendation for the necessary number of polar modes has been given by N kr o 10 being the 21 Oct 2001 Modelling of the Antenna to Range Coupling for a Compact Range Authors Frank Jensen Knud Pontoppidan Two ways of modelling a compact range design are presented and the coupling to a given antenna under test AUT is

    Original URL path: http://www.ticra.com/papers/16?page=2 (2016-05-01)
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  • New Fast and Robust Modelling Algorithms for Electrically Large Antennas and Platforms | TICRA
    New Fast and Robust Modelling Algorithms for Electrically Large Antennas and Platforms Abstract This paper presents two new modelling algorithms that were recently added to the commercially available GRASP software package for electrically large antenna and scattering problems In particular a new higher order multilevel fast multipole solver HO MLFMM provides very high simulation accuracy while requiring significantly less memory and CPU time than the commonly available low order MLFMM At the same time the solver incorporates a generalised form of the underlying surface integral equations which allows the use of non connected meshes and enhances the robustness in real life applications As a further addition to GRASP we outline a new Fast PO algorithm which provides accelerated integration of Physical Optics currents as well as surface currents in general The algorithm eliminates some of the limitations of previously published methods e g by allowing observation points located well within the near field region of the antenna without resorting to a much slower direct surface integration The capabilities of the new algorithms are illustrated by examples involving a large reflector antenna ground station and a detailed model of a communication satellite Publication Proc EuCAP 2015 Place Lisbon Portugal 12 17

    Original URL path: http://www.ticra.com/papers/new-fast-and-robust-modelling-algorithms-electrically-large-antennas-and-platforms (2016-05-01)
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  • Integral Equation Modelling of Reverberation Chambers using Higher-Order Basis Functions | TICRA
    Chambers using Higher Order Basis Functions Abstract Reverberation chambers RCs are important measurement facilities and thus it is often required to simulate their behaviour numerically However due to their special characteristics especially for high Q factors they are often considered too challenging for application of standard numerical software In particular a recent publication 1 listed the perceived state of the art in integral equation modelling of RCs and identified numerous open problems The present paper illustrates that computational analysis of large RCs can be performed with limited computer resources This can be achieved by using Higher Order HO basis functions in the integral equation discretization and if necessary further applying the Multi Level Fast Multipole Method After a discussion and brief review of existing methods for RC modelling we will turn to a description of the key features of HO basis functions and their related MLFMM implementation focusing on how they allow surpassing some of the challenges faced by lower order discretizations Then several RC test cases are analyzed drawing comparisons to other results from the relevant literature The conclusion is that using HO basis functions and a thorough MLFMM implementation some of the challenges identified in 1 can be

    Original URL path: http://www.ticra.com/papers/integral-equation-modelling-reverberation-chambers-using-higher-order-basis-functions (2016-05-01)
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  • Generalized Admittance Matrix Method for Fast Full-Wave Analysis of Integrated Lens Antennas | TICRA
    is analysed with a higher order 3D MoM algorithm while the rotationally symmetric lens is analysed with a higher order BoR MoM Each method allows the extraction of a generalized admittance matrix that fully characterizes the region in question The individual matrices are finally combined to form the overall admittance matrix which may subsequently be used to compute all desired quantities scattering parameters or fields The method is well suited

    Original URL path: http://www.ticra.com/papers/generalized-admittance-matrix-method-fast-full-wave-analysis-integrated-lens-antennas (2016-05-01)
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  • Papers tagged with : Method of Moments | TICRA
    the identification of array elements improper functioning and failure the obtainable spatial 07 Jul 2013 CHAMP The Dedicated Design Tool for Rotationally Symmetric Horns and Reflector Terminals Authors Hans Henrik Viskum A fast and accurate approach to designing horns and reflectors is implemented in the CHAMP code The paper presents examples of designs including shaped reflectors and a horn with a dielectric 08 Apr 2013 Domain Decomposition Technique for Efficient Analysis of Rotationally Symmetric Reflector Systems Containing 3D Structures Authors Erik Jørgensen Peter Meincke An efficient algorithm for analysis and optimization of rotationally symmetric reflector antennas possibly including 3D support structures and or waveguide components is presented The high 29 Oct 2012 Design Tool for High Performance Rotationally Symmetric Reflector Antennas Authors Erik Jørgensen Peter Meincke In this paper we present an efficient higher order BoR MoM in which the unknown surface current is discretized using hierarchical Legendre basis functions that are adapted to the circular 21 Oct 2012 Array Antenna Diagnostics with the 3D Reconstruction Algorithm Authors Cecilia Cappellin Peter Meincke Erik Jørgensen The 3D reconstruction algorithm is applied to a slotted waveguide array measured at the DTU ESA Spherical Near Field Antenna Test Facility One slot of the array is covered by conductive tape and 03 Oct 2012 Fast and Accurate Design Tool for Rotationally Symmetric Reflector Antennas with 3D Waveguide Components and Support Structures Authors Erik Jørgensen Peter Meincke We present a new efficient design tool for rotationally symmetric reflector antennas possibly including 3D support structures and waveguide components The tool is based on a combination of four 20 Jul 2012 Accurate and Efficient Analysis of Printed Reflectarrays With Arbitrary Elements Using Higher Order Hierarchical Legendre Basis Functions Authors Min Zhou Erik Jørgensen Stig Busk Sørensen Peter Meincke It is demonstrated that nonsingular higher order hierarchical Legendre

    Original URL path: http://www.ticra.com/papers/8?page=1 (2016-05-01)
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  • Papers tagged with : Method of Moments | TICRA
    with rectangular patches is proposed While the standard procedure has been to calculate the electric currents on the patches using e g a periodic Green s 18 Oct 2011 Investigations on Accurate Analysis of Microstrip Reflectarrays Authors Min Zhou Stig Busk Sørensen An investigation on accurate analysis of microstrip reflectarrays is presented Sources of error in reflectarray analysis are examined and solutions to these issues are proposed The focus is on 18 Oct 2011 Processing of Measured Fields Using Advanced Inverse Method of Moments Algorithm Authors Erik Jørgensen Peter Meincke Oscar Borries A higher order inverse method of moments algorithm employing smooth current and geometry representations as well as a very noise robust solution algorithm was presented at last year s ESA 03 Jul 2011 Efficient Analysis of Reflector Antennas using GRASP Authors Erik Jørgensen Hans Henrik Viskum Stig Busk Sørensen Peter Meincke GRASP has for many years constituted the de facto standard in the space community for advanced reflector antenna modeling The tool has furthermore found widespread use in the earth station 10 Oct 2010 Latest Achievements in Antenna Diagnostics and Processing of Measured Fields Authors Cecilia Cappellin Erik Jørgensen Peter Meincke A stand alone commercial program performing advanced electromagnetic processing of measured data is being developed by TICRA The program reads the measured field and computes the extreme near 05 Oct 2010 Improved Source Reconstruction Technique for Antenna Diagnostics Authors Erik Jørgensen Peter Meincke Cecilia Cappellin This paper presents an improved inverse Method of Moment technique that allows surface currents to be reconstructed on the surface of an antenna The input to the algorithm is 04 Nov 2007 Polarisation Dependent Scattering from the Serrations of Compact Ranges Authors Frank Jensen Serrations are often applied at the edges of compact range reflectors in order to reduce the scattering from

    Original URL path: http://www.ticra.com/papers/8?page=2 (2016-05-01)
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