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Sensors 2015, 15(9), 21673-21695; doi:10.3390/s150921673

GNSS Signal Tracking Performance Improvement for Highly Dynamic Receivers by Gyroscopic Mounting Crystal Oscillator

1
School of Electronics and Information Engineering, Beihang University, 37 Xueyuan Road Haidian District, Beijing 100191, China
2
School of Computer and Information, Hefei University of Technology, Tunxi Road 193, Hefei 230009, China
*
Author to whom correspondence should be addressed.
Academic Editor: Ha Duong Ngo
Received: 29 June 2015 / Revised: 21 August 2015 / Accepted: 25 August 2015 / Published: 31 August 2015
(This article belongs to the Special Issue Sensors for Harsh-Environment Applications)

Abstract

In this paper, the efficiency of the gyroscopic mounting method is studied for a highly dynamic GNSS receiver’s reference oscillator for reducing signal loss. Analyses are performed separately in two phases, atmospheric and upper atmospheric flights. Results show that the proposed mounting reduces signal loss, especially in parts of the trajectory where its probability is the highest. This reduction effect appears especially for crystal oscillators with a low elevation angle g-sensitivity vector. The gyroscopic mounting influences frequency deviation or jitter caused by dynamic loads on replica carrier and affects the frequency locked loop (FLL) as the dominant tracking loop in highly dynamic GNSS receivers. In terms of steady-state load, the proposed mounting mostly reduces the frequency deviation below the one-sigma threshold of FLL (1σFLL). The mounting method can also reduce the frequency jitter caused by sinusoidal vibrations and reduces the probability of signal loss in parts of the trajectory where the other error sources accompany this vibration load. In the case of random vibration, which is the main disturbance source of FLL, gyroscopic mounting is even able to suppress the disturbances greater than the three-sigma threshold of FLL (3σFLL). In this way, signal tracking performance can be improved by the gyroscopic mounting method for highly dynamic GNSS receivers. View Full-Text
Keywords: highly dynamic GNSS receiver; FLL; gyroscopic mounting; random vibration; sinusoidal vibrations; acoustic highly dynamic GNSS receiver; FLL; gyroscopic mounting; random vibration; sinusoidal vibrations; acoustic
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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

Abedi, M.; Jin, T.; Sun, K. GNSS Signal Tracking Performance Improvement for Highly Dynamic Receivers by Gyroscopic Mounting Crystal Oscillator. Sensors 2015, 15, 21673-21695.

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