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Sensors 2015, 15(10), 25399-25415; doi:10.3390/s151025399

Design and Performance Evaluation of a Dual Antenna Joint Carrier Tracking Loop

1
GNSS Research Center, Wuhan University, Wuhan 430079, China
2
Department of Geomatrics Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
*
Author to whom correspondence should be addressed.
Academic Editor: Assefa M. Melesse
Received: 11 March 2015 / Revised: 15 August 2015 / Accepted: 28 September 2015 / Published: 1 October 2015
(This article belongs to the Section Remote Sensors)
View Full-Text   |   Download PDF [645 KB, uploaded 1 October 2015]   |  

Abstract

In order to track the carrier phases of Global Navigation Satellite Systems (GNSS) signals in signal degraded environments, a dual antenna joint carrier tracking loop is proposed and evaluated. This proposed tracking loop processes inputs from two antennas, namely the master antenna and the slave antenna. The master antenna captures signals in open-sky environments, while the slave antenna capture signals in degraded environments. In this architecture, a Phase Lock Loop (PLL) is adopted as a master loop to track the carrier phase of the open-sky signals. The Doppler frequency estimated by this master loop is utilized to assist weak carrier tracking in the slave loop. As both antennas experience similar signal dynamics due to satellite motion and clock frequency variations, a much narrower loop bandwidth and possibly a longer coherent integration can be adopted to track the weak signals in slave channels, by utilizing the Doppler aid from master channels. PLL tracking performance is affected by the satellite/user dynamics, clock instability, and thermal noise. In this paper, their impacts on the proposed phase tracking loop are analyzed and verified by both simulation and field data. Theoretical analysis and experimental results show that the proposed loop structure can track degraded signals (i.e., 18 dB-Hz) with a very narrow loop bandwidth (i.e., 0.5 Hz) and a TCXO clock. View Full-Text
Keywords: GNSS receiver; carrier phase tracking; differential carrier phase; weak signal; loop bandwidth GNSS receiver; carrier phase tracking; differential carrier phase; weak signal; loop bandwidth
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

Guo, W.; Lin, T.; Niu, X.; Shi, C.; Zhang, H. Design and Performance Evaluation of a Dual Antenna Joint Carrier Tracking Loop. Sensors 2015, 15, 25399-25415.

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