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Sensors 2016, 16(11), 1824; doi:10.3390/s16111824

Millimetre Level Accuracy GNSS Positioning with the Blind Adaptive Beamforming Method in Interference Environments

Department of Geomatics Engineering, University of Calgary, PLAN Group Schulich School of Engineering, 2500 University Drive, N.W., Calgary, AB T2N 1N4, Canada
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Academic Editor: Ba-Ngu Vo
Received: 13 August 2016 / Revised: 18 October 2016 / Accepted: 26 October 2016 / Published: 31 October 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [4571 KB, uploaded 31 October 2016]   |  

Abstract

The use of antenna arrays in Global Navigation Satellite System (GNSS) applications is gaining significant attention due to its superior capability to suppress both narrowband and wideband interference. However, the phase distortions resulting from array processing may limit the applicability of these methods for high precision applications using carrier phase based positioning techniques. This paper studies the phase distortions occurring with the adaptive blind beamforming method in which satellite angle of arrival (AoA) information is not employed in the optimization problem. To cater to non-stationary interference scenarios, the array weights of the adaptive beamformer are continuously updated. The effects of these continuous updates on the tracking parameters of a GNSS receiver are analyzed. The second part of this paper focuses on reducing the phase distortions during the blind beamforming process in order to allow the receiver to perform carrier phase based positioning by applying a constraint on the structure of the array configuration and by compensating the array uncertainties. Limitations of the previous methods are studied and a new method is proposed that keeps the simplicity of the blind beamformer structure and, at the same time, reduces tracking degradations while achieving millimetre level positioning accuracy in interference environments. To verify the applicability of the proposed method and analyze the degradations, array signals corresponding to the GPS L1 band are generated using a combination of hardware and software simulators. Furthermore, the amount of degradation and performance of the proposed method under different conditions are evaluated based on Monte Carlo simulations. View Full-Text
Keywords: adaptive GNSS array processing; anti-jammer; blind beamforming; distortionless carrier phase measurements adaptive GNSS array processing; anti-jammer; blind beamforming; distortionless carrier phase measurements
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Daneshmand, S.; Marathe, T.; Lachapelle, G. Millimetre Level Accuracy GNSS Positioning with the Blind Adaptive Beamforming Method in Interference Environments. Sensors 2016, 16, 1824.

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