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Micromachines 2017, 8(5), 135; doi:10.3390/mi8050135

Improving the Design of MEMS INS-Aided PLLs for GNSS Carrier Phase Measurement under High Dynamics

GNSS Research Center, Wuhan University, 129 Luoyu Road, Wuhan 430079, China
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Academic Editor: Nam-Trung Nguyen
Received: 24 March 2017 / Revised: 10 April 2017 / Accepted: 17 April 2017 / Published: 25 April 2017
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Abstract

The phase locked loop (PLL) bandwidth suffers a dilemma on carrier phase accuracy and dynamic stress tolerance in stand-alone global navigation satellite systems (GNSS) receivers. With inertial navigation system (INS) aiding, PLLs only need to tolerate aiding information error, instead of dynamic stress. To obtain accurate carrier phase under high dynamics, INS-aided PLLs need be optimally designed to reduce the impact of aiding information error. Typical micro-electro-mechanical systems (MEMS) INS-aided PLLs are implemented and tested under high dynamics. Tests using simulation show there is a step change in the aiding information at each integer second, which deteriorates the carrier phase accuracy. An improved structure of INS-aided PLLs is proposed to eliminate the step change impact. Even when the jerk is 2000 m/s3, the tracking error of the proposed INS-aided PLL is no more than 3°. Finally, the performances of stand-alone PLLs and INS-aided PLLs are compared using field tests. When the antenna jerk is 300 m/s3, the carrier phase error from the stand-alone PLLs significantly increased, while the carrier phase error from the MEMS INS-aided PLLs almost remained the same. Therefore, the proposed INS-aided PLLs can suppress tracking errors caused by noise and dynamic stress simultaneously under high dynamics. View Full-Text
Keywords: INS-aided PLLs; carrier phase; tracking error; high dynamics; GNSS/INS deeply-coupled system; MEMS INS INS-aided PLLs; carrier phase; tracking error; high dynamics; GNSS/INS deeply-coupled system; MEMS INS
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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

Zhang, T.; Ban, Y.; Niu, X.; Guo, W.; Liu, J. Improving the Design of MEMS INS-Aided PLLs for GNSS Carrier Phase Measurement under High Dynamics. Micromachines 2017, 8, 135.

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