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Micromachines 2017, 8(6), 191; doi:10.3390/mi8060191

Improvement of GNSS Carrier Phase Accuracy Using MEMS Accelerometer-Aided Phase-Locked Loops for Earthquake Monitoring

GNSS Research Center, Wuhan University, 129 Luoyu Road, Wuhan 430079, China
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Received: 18 May 2017 / Revised: 6 June 2017 / Accepted: 16 June 2017 / Published: 19 June 2017

Abstract

When strong earthquake occurs, global navigation satellite systems (GNSS) measurement errors increase significantly. Combined strategies of GNSS/accelerometer data can estimate better precision in displacement, but are of no help to carrier phase measurement. In this paper, strong-motion accelerometer-aided phase-locked loops (PLLs) are proposed to improve carrier phase accuracy during strong earthquakes. To design PLLs for earthquake monitoring, the amplitude-frequency characteristics of the strong earthquake signals are studied. Then, the measurement errors of PLLs before and after micro electro mechanical systems (MEMS) accelerometer aiding are analyzed based on error models. Furthermore, tests based on a hardware simulator and a shake table are carried out. Results show that, with MEMS accelerometer aiding, the carrier phase accuracy of the PLL decreases little under strong earthquakes, which is consistent with the models analysis. View Full-Text
Keywords: PLLs; MEMS accelerometer; carrier phase; GNSS; earthquake monitoring PLLs; MEMS accelerometer; carrier phase; GNSS; earthquake monitoring
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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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Zhang, T.; Liu, H.; Chen, Q.; Zhang, H.; Niu, X. Improvement of GNSS Carrier Phase Accuracy Using MEMS Accelerometer-Aided Phase-Locked Loops for Earthquake Monitoring. Micromachines 2017, 8, 191.

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