Design and Implementation of FOG Based Gyrocompass

Abbas, Aqeel

doi:10.4028/www.scientific.net/amm.332.124

Cited by 4 publications

(4 citation statements)

References 9 publications

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“…It is also possible to combine both methods by performing static measurements at regularly spaced angular positions (Abbas, 2013). In this hybrid case, the sampling time can be optimum.…”

Section: Dynamic and Combined Methodsmentioning

confidence: 99%

Fog-based automatic true north detection for absolute magnetic declination measurement

Gonsette

Rasson

Bracke

et al. 2017

Geosci. Instrum. Method. Data Syst.

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Abstract. Absolute magnetic measurements are of great importance in magnetic observatories. They allow not only instrument calibration but also data quality checking. They require the vertical and the geographic or true north as reference directions, usually determined by means of a level and by pointing an azimuth mark, respectively. We present here a novel system able to measure the direction of the magnetic field and of the vertical and true north. A design of a north seeker is proposed taking into account sensor bias as well as misalignment errors. Different methods are derived from this model and measurement results are presented. A measurement test at high latitude is also shown.

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“…It is also possible to combine both methods by performing static measurements at regularly spaced angular positions (Abbas, 2013). In this hybrid case, the sampling time can be optimum.…”

Section: Dynamic and Combined Methodsmentioning

confidence: 99%

Fog-based automatic true north detection for absolute magnetic declination measurement

Gonsette

Rasson

Bracke

et al. 2017

Geosci. Instrum. Method. Data Syst.

View full text Add to dashboard Cite

show abstract

“…It is also possible to combine both methods by performing static measurements at regular spaced angular positions (Abbas, 2013). In this hybrid case, the sampling time can be optimum.…”

Section: Dynamic and Combined Methodsmentioning

confidence: 99%

Automatic True North detection during absolute magnetic declination measurement

Gonsette

Rasson

Bracke

et al. 2017

Preprint

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Abstract. Absolute magnetic measurements are of great importance in magnetic observatories. They allow not only instrument calibration but also data quality checking. They require the Vertical and the geographic North as reference directions, usually determined by means of a level and by pointing an azimuth mark respectively. We present here a novel system able to measure the direction of the magnetic field, of the Vertical and True-North. A design of a North-seeker is proposed taking into account sensor bias as well as misalignment errors. Different methods are derived from this model and measurement results are presented. A measurement test at high latitude is also shown.

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“…Numerous studies have focused on dynamic north-finding methods to expedite and enhance the accuracy of north-finding [ 19 , 20 , 21 , 22 , 23 ]. The dynamic method involves the continuous rotation of the gyroscope, driven by the turntable at a predetermined speed, with the azimuth angle determined by analyzing the continuous gyroscope output signal [ 20 , 21 , 24 , 25 ]. The robustness of the dynamic method to bias error, scale factor deviation, and temperature drift has been demonstrated in the literature [ 21 , 22 , 26 ] and compared to static north-finding.…”

Section: Introductionmentioning

confidence: 99%

A Segmented Cross-Correlation Algorithm for Dynamic North Finding Using Fiber Optic Gyroscopes

Fang,

Mao,

Chen

et al. 2024

Sensors

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Fiber optic gyroscope (FOG)-based north finding is extensively applied in navigation, positioning, and various fields. In dynamic north finding, an accelerated turntable speed shortens the time required for north finding, resulting in a rapid north-finding response. However, with an increase in turntable speed, the turntable’s jitter contributes to signal contamination in the FOG, leading to a deterioration in north-finding accuracy. This paper introduces a divide-and-conquer algorithm, the segmented cross-correlation algorithm, designed to mitigate the impact of turntable speed jitter. A model for north-finding error is established and analyzed, incorporating FOG’s self-noise and the turntable’s speed jitter. To validate the feasibility of our method, we implemented the algorithm on a FOG. The simulation and experimental results exhibited a strong concordance, affirming the validity of our proposed north-finding error model. The experimental findings indicate that, at a turntable speed of 180°/s, the north-finding bias error within a 360 s duration is 0.052°, representing a 64% improvement over the traditional algorithm. These results indicate the effectiveness of the proposed algorithm in mitigating the impact of unstable turntable speeds, offering a solution for north finding with both prompt response and enhanced accuracy.

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Design and Implementation of FOG Based Gyrocompass

Cited by 4 publications

References 9 publications

Fog-based automatic true north detection for absolute magnetic declination measurement

Fog-based automatic true north detection for absolute magnetic declination measurement

Automatic True North detection during absolute magnetic declination measurement

A Segmented Cross-Correlation Algorithm for Dynamic North Finding Using Fiber Optic Gyroscopes

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