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Compact antenna array receiver for robust satellite navigation systems

Published online by Cambridge University Press:  14 July 2014

S. Irteza ,
E. Schäfer ,
R. Stephan ,
A. Hornbostel  and
M. A. Hein
S. Irteza*
Affiliation:
RF and Microwave Laboratory, Ilmenau University of Technology, Ilmenau, Germany
E. Schäfer
Affiliation:
Institute for Microelectronic and Mechatronic Systems, Ilmenau, Germany
R. Stephan
Affiliation:
RF and Microwave Laboratory, Ilmenau University of Technology, Ilmenau, Germany
A. Hornbostel
Affiliation:
German Aerospace Center (DLR), Oberpfaffenhofen, Germany
M. A. Hein
Affiliation:
RF and Microwave Laboratory, Ilmenau University of Technology, Ilmenau, Germany
*
Corresponding author: S. Irteza Email: safwat-irteza.butt@tu-ilmenau.de
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Abstract

A compact navigation receiver comprising a decoupled and matched four-element L1-band antenna array with an inter-element separation of a quarter of the free-space wavelength is presented in this paper. We investigate the impact of the decoupling and matching network on the robustness of the navigation receiver. It is observed that in order to achieve high robustness with a compact antenna array, it is necessary to employ a decoupling and matching network, particularly in case of three spatially separated interferers. Furthermore, we study the influence of the polarization impurity of the compact planar antenna array on the equivalent carrier-to-interference-plus-noise ratio (CINR) of the receiver when impinged with different numbers of diametrically polarized interference signals. It is shown that the higher-order modes possess strong polarization impurity, which may halve the available degrees-of-freedom for nulling in the presence of linear-polarized interferers, using a conventional null-steering algorithm. We verify the robustness of the designed compact receiver by means of a complete global-navigation-satellite-system demonstrator. It is shown that the maximum jammer power that is allowed us to maintain the CINR above 38 dBHz with three interferers can be improved by more than 10 dB if a decoupling and matching network is employed.

Keywords

Active array antennas and componentsSmart antennasDigital beamformingDecoupling and matching network
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 7 , Issue 6 , December 2015 , pp. 735 - 745
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2014 

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References

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