scholarly journals A model of the response of the MGS-6 gravity sensor to tilting

Measurement ◽  
2021 ◽  
pp. 110573
Author(s):  
Krzysztof Pyrchla ◽  
Małgorzata Pająk ◽  
Julia Gołyga ◽  
Jerzy Pyrchla
Keyword(s):  
Gravity Sensor

scholarly journals MicroGal Gravity Measurements with MGS-6 Micro-g LaCoste Gravimeter

Sensors ◽  
2019 ◽  
Vol 19 (11) ◽  
pp. 2592 ◽  
Author(s):  
Marek Przyborski ◽  
Jerzy Pyrchla ◽  
Krzysztof Pyrchla ◽  
Jakub Szulwic
Keyword(s):  
Temporal Stability ◽  
Low Noise ◽  
Reference Source ◽  
Time Stability ◽  
Superconducting Gravimeters ◽  
Gravity Measurements ◽  
Gravity Sensor ◽  
The Impact ◽  
Micro Gravity

The article discusses the registration of micro-gravity changes with the MGS-6 Micro-g LaCoste gravity sensor during static measurements. An experiment was carried out to determine how small changes in gravity can be registered using the MGS-6 system sensor. The tides of the Earth’s crust were chosen as the source of disturbance of the field with small amplitude and long-term changes. The tested sensor was placed in a geophysical observatory on a specially designed tripod. Simultaneously on the nearby concrete pillar, the registration of changes in gravity was carried out using the superconducting iGrav gravimeter. The high temporal stability of the superconducting gravimeters and the low noise combined with leading sensitivity of its reading allow it to be considered as a reliable reference source for MGS-6. The article discusses the impact of non-leveling changes of the MGS-6 gravimetry on the reading and determines the size of its non-linear drift. The obtained differences in indications between devices did not exceed 50 μ Gal for 68% of data. The measurements also showed excellent time stability of the MGS-6 measurement system. The data collected during the experiment allowed determining the level of accuracy that can be sought during real measurements using the MGS-6 system on research vessels. They also give an overview of the dynamics of the drift phenomenon of the analyzed research system.

A New Real-Time Position and Orientation Tracking System for Endoscopy

2011 ◽  
Vol 130-134 ◽  
pp. 1196-1199
Author(s):  
Li Kun Liu ◽  
Zi Zi Ouyang ◽  
Sen Wang ◽  
Yi Wang ◽  
Xiao Dong Chen ◽  
...  
Keyword(s):  
Real Time ◽  
Tracking System ◽  
Magnetic Sensor ◽  
Position Determination ◽  
Flux Intensity ◽  
Gravity Sensor ◽  
Time Position ◽  
Specific Position ◽  
Position And Orientation ◽  
Orientation Determination

A New real-time position and orientation tracking system for endoscopy is described. Three coils sequentiallyfed with current comprise the excitation source which will produce magnetic field. According to Biot-Savart-Laplace law, flux intensity data detected by three-axis magnetic sensor could be interpreted into information that will reflect the sensor's specific position, thus realizing the position determination. Also, data detected by the magnetic sensor and gravity sensor changes in connection with the spatial angles. By researching the change law between the two, spatial angles of the sensor is calculated, thus realizing orientation determination. It is shown errors in position determination is,errors in orientation determination is , the tracking frequency of the system is 10 Hz.

Development of a Low-Cost Unmanned Aerial Vehicle Using Mini-Airship Structure for Acquiring Digital Image Platform

2012 ◽  
Vol 271-272 ◽  
pp. 427-431 ◽  
Author(s):  
Han Wei Hsiao ◽  
Sheng Heng Tung ◽  
Ming Hsiang Shih ◽  
Wen Pei Sung
Keyword(s):  
Unmanned Aerial Vehicle ◽  
Low Cost ◽  
Control Model ◽  
Video Monitoring ◽  
Proportional Integral Derivative ◽  
Proportional Integral Derivative Controller ◽  
Gravity Sensor ◽  
Aerial Vehicle ◽  
Long Endurance ◽  
Design Cost

In this study, a low-design-cost and long-endurance unmanned aerial vehicle (UAV) based on the simple microcontroller board and mini-airship technique is proposed. Many well developed positioning sensors, such as GPS, 3-axis Gyroscope, Gravity-sensor and Magnetometer are used. In addition, the control model of Proportional-Integral-Derivative controller is applied to accomplish the long endurance purpose. Such a low-cost design has the potential to accelerate the application of UAV in a variety of video monitoring fields.

scholarly journals Effects of Vertical Nonlinearity on the Superconducting Gravimeter CT #036 at Ishigakijima, Japan

2021 ◽  
Author(s):  
Yuichi Imanishi ◽  
Kazunari Nawa ◽  
Yoshiaki Tamura ◽  
Hiroshi Ikeda
Keyword(s):  
Vertical Component ◽  
Superconducting Gravimeter ◽  
Slow Slip Events ◽  
High Background ◽  
Gravity Sensor ◽  
High Background Noise ◽  
Experimental Approaches ◽  
Characteristic Features ◽  
The Times

Abstract One of the characteristic features of the gravity recordings produced by the superconducting gravimeter CT #036 at Ishigakijima, Japan, is that it indicates gravity increase when a typhoon (hurricane) approaches the island. Since we are trying to detect small gravity signals associated with the long-term slow slip events in this region, it is very important in the interpretation of the observed data whether such gravity changes are of natural or instrumental origin. In this paper, we investigate whether or not nonlinearity in the sensor of the superconducting gravimeter is responsible for this phenomenon. Here we take the same theoretical approach as taken by Imanishi et al. (2018) which investigated the effect of coupling between horizontal and vertical components of the gravity sensor in order to understand the noise caused by the movements of a nearby VLBI antenna. From theoretical and experimental approaches, we prove that the gravity increase observed by CT #036 at the times of high background noise level can not be explained by instrumental effects such as the nonlinearity in the vertical component or the coupling between horizontal and vertical components of the gravity sensor. This implies that the observed gravity increases are real gravity signals of natural origin.

scholarly journals Magnetic Angular Rate and Gravity Sensor Based Supervised Learning for Positioning Tasks

Sensors ◽  
2019 ◽  
Vol 19 (24) ◽  
pp. 5364 ◽  
Author(s):  
Balázs Nagy ◽  
János Botzheim ◽  
Péter Korondi
Keyword(s):  
Noise Reduction ◽  
Supervised Learning ◽  
Sensor Fusion ◽  
Angular Rate ◽  
Translational Motion ◽  
Main Challenge ◽  
Different Types ◽  
Gravity Sensor ◽  
Position Data ◽  
Signal Processing Methods

This paper deals with sensor fusion of magnetic, angular rate and gravity sensor (MARG). The main contribution of this paper is the sensor fusion performed by supervised learning, which means parallel processing of the different kinds of measured data and estimating the position in periodic and non-periodic cases. During the learning phase, the position estimated by sensor fusion is compared with position data of a motion capture system. The main challenge is avoiding the error caused by the implicit integral calculation of MARG. There are several filter based signal processing methods for disturbance and noise estimation, which are calculated for each sensor separately. These classical methods can be used for disturbance and noise reduction and extracting hidden information from it as well. This paper examines the different types of noises and proposes a machine learning-based method for calculation of position and orientation directly from nine separate sensors. This method includes the disturbance and noise reduction in addition to sensor fusion. The proposed method was validated by experiments which provided promising results on periodic and translational motion as well.

Research on vehicle attitude and heading reference system based on multi-sensor information fusion

2020 ◽  
Vol 234 (13) ◽  
pp. 3056-3067
Author(s):  
Jiacheng Fan ◽  
Zengcai Wang ◽  
Mingxing Lin ◽  
Susu Fang ◽  
Xiangpeng Liu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Low Cost ◽  
Angular Rate ◽  
Estimation Method ◽  
Linear Acceleration ◽  
Operating Conditions ◽  
Frequency Noise ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Gravity Sensor

To improve the accuracy of attitude and heading reference systems for moving vehicles, an effective orientation estimation method is proposed. The method uses an odometer, a low-cost magnetic, angular rate, and gravity sensor. This study addresses the problems of non-orthogonal error, carrier magnetic field interference and calibration to obtain accurate, long-term, stable magnetic field strength. A neural network fusion 12-parameter ellipse fitting method is proposed to eliminate the soft magnetic field and hard magnetic field interference. The interference to the accelerometer from linear acceleration is eliminated by using an odometer and a gyroscope, and the high-frequency noise from the accelerometer is eliminated by using a low-pass filter. An improved method to evaluate vehicle attitude is proposed and utilized to compensate for filtered accelerometer measurement when the vehicle is moving at a uniform, accelerate and steering state. The proposed method uses an effective adaptive Kalman filter based on the error state model to reduce dynamic perturbations. Filter gain is adaptively tuned under different moving modes by adjusting the noise matrix. The effectiveness of the algorithm is verified by experiments and simulations in multiple operating conditions.

Optical readout design for a MEMS semi-absolute pendulum gravimeter

2021 ◽  
Author(s):  
Phoebe Utting ◽  
Giles Hammond ◽  
Abhinav Prasad ◽  
Richard Middlemiss
Keyword(s):  
Microelectromechanical Systems ◽  
Gravity Data ◽  
Oscillation Period ◽  
Mems Sensor ◽  
Optical Readout ◽  
Gravity Measurements ◽  
Gravity Sensor ◽  
Mt Etna ◽  
Current Design ◽  
Set Up

<p>Gravimetry has many useful applications from volcanology to oil exploration; being a method able to infer density variations beneath the ground. Therefore, it can be used to provide insight into subsurface processes such as those related to the hydrothermal and magmatic systems of volcanoes. Existing gravimeters are costly and heavy, but this is changing with the utilisation of a technology most notably used in mobile phone accelerometers: MEMS –(Microelectromechanical-systems). Glasgow University has already developed a relative MEMS gravimeter and is currently collaborating with multiple European institutions to make a gravity sensor network around Mt Etna - NEWTON-g. A second generation of the MEMS sensor is now being designed and fabricated in the form of a semi-absolute pendulum gravimeter. Gravity data for geodetic and geophysical use were provided by pendulum measurements from the 18<sup>th</sup> to the 20<sup>th</sup> century. However, scientists and engineers reached the limit of fabrication tolerances and readout accuracy approximately 100 years ago. With nanofabrication and modern electronics techniques, it is now possible to create a competitive pendulum gravimeter again. The pendulum method is used to determine gravity values from the oscillation period of a pendulum with known length. The current design couples two pendulums together. Here, an optical shadow-sensor pendulum readout technique is presented. This employs an LED and split photodiode set-up. This optical readout can provide measurements to sub-nanometre precision, which could enable gravitational sensitivities for useful geophysical surveying. If semi-absolute values of gravity can be measured, then instrumental drift concerns are reduced. Additionally, the need for calibration against commercial absolute gravimeters may not be necessary. This promotes improved accessibility of gravity measurements at an affordable cost.</p>

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