A Short Walk along the Gravimeters Path

Marson, I.

doi:10.1155/2012/687813

Cited by 26 publications

(15 citation statements)

References 25 publications

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“…An advantage of the rise and fall method is that being symmetric, it is less sensitive to the effects of the residual air and some timing errors (D'Agostino et al, ; Faller & Marson, ). However, throwing a mass vertically is challenging, because of the important release velocity (Marson, ). The main advantage of the free‐fall method is its mechanical simplicity, making it easier to attain a high sampling rate, that is, a drop every few seconds in classical instruments or a few tenths of a second in atom gravimeters.…”

Section: Measuring Gravitymentioning

confidence: 99%

Geophysics From Terrestrial Time‐Variable Gravity Measurements

Camp

Viron

Watlet

et al. 2017

Reviews of Geophysics

177

105

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In a context of global change and increasing anthropic pressure on the environment, monitoring the Earth system and its evolution has become one of the key missions of geosciences. Geodesy is the geoscience that measures the geometric shape of the Earth, its orientation in space, and gravity field. Time‐variable gravity, because of its high accuracy, can be used to build an enhanced picture and understanding of the changing Earth. Ground‐based gravimetry can determine the change in gravity related to the Earth rotation fluctuation, to celestial body and Earth attractions, to the mass in the direct vicinity of the instruments, and to vertical displacement of the instrument itself on the ground. In this paper, we review the geophysical questions that can be addressed by ground gravimeters used to monitor time‐variable gravity. This is done in relation to the instrumental characteristics, noise sources, and good practices. We also discuss the next challenges to be met by ground gravimetry, the place that terrestrial gravimetry should hold in the Earth observation system, and perspectives and recommendations about the future of ground gravity instrumentation.

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Section: Measuring Gravitymentioning

confidence: 99%

Geophysics From Terrestrial Time‐Variable Gravity Measurements

Camp

Viron

Watlet

et al. 2017

Reviews of Geophysics

177

105

View full text Add to dashboard Cite

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“…Similar kinds of gravity meters are also used on the ship; however, they are specially designed to take care of vertical and horizontal accelerations with gyroscopic adjustments. A detailed account of gravity measurements is described in several publications (Marson 2012;Niebauer 2015;Van Camp et al 2017). These measurements are mainly of two kinds: absolute gravity and relative gravity measurements.…”

Section: Measuring Equipmentmentioning

confidence: 99%

Gravity Method, Surface

Mishra¹,

Tiwari²

2020

Encyclopedia of Solid Earth Geophysics

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Gravity method A geophysical technique based on measuring the variations in the earth's gravity field at specific locations. Gravity stations Locations where gravity measurements are made. Base gravity stations Locations where absolute value of the earth's gravity field is known. Primary base Gravity observation stations, which are made on stable platform and absolute value of the gravity field is known to a greater accuracy. Secondary bases Temporary bases established for a particular survey. Closed loop Bases that are connected in a loop for base loop correction. Drift correction Correction applied for nontidal variation of gravity, which is mainly dependent on the behavior of gravity meters with time. EOTVOS correction Correction applied to marine gravity data for the movement of ship. mGal; 1 mGal ¼ 10 À5 m/s 2 mGal; 1 mGal ¼ 10 À8 m/s 2

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“…In Polar Regions without satellite gravity data, it is the only practicable gravity determination approach. While shipborne gravimetry using gas-pressured, pendulum or spring gravimeters had already been employed in the first half of the twentieth century (Marson 2012;Nabighian et al 2005), first airborne gravity test flight results using a horizontally stabilized spring gravimeter have not been published before 1960 (Nettleton et al 1960). In the 1990s, a major improvement in the obtained accuracy followed the advent of the Global Positioning System (GPS), followed by further Global Navigation Satellite Systems (GNSS).…”

Section: Introductionmentioning

confidence: 99%

Multi-Scenario Evaluation of the Direct Method in Strapdown Airborne and Shipborne Gravimetry

Johann

Becker

et al. 2020

International Association of Geodesy Symposia

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In recent years, it was shown that the quality of strapdown airborne gravimetry using a navigation-grade strapdown inertial measurement unit (IMU) could be on par with “classical” airborne gravimeters as the 2-axis stabilized LaCoste and Romberg S-type gravimeter. Basically, two processing approaches exist in strapdown gravimetry. Applying the indirect method (also referred to as “inertial navigation approach” or “one-step approach”), all observations – raw GNSS observations or position solutions, IMU specific force and angular rate measurements – are combined in a single Kalman Filter. Alternatively, applying the direct method (also referred to as “accelerometry approach” or “cascaded approach”), GNSS position solutions are numerically differentiated twice to get the vehicle’s kinematic acceleration, which is then directly removed from the IMU specific force measurement in order to obtain gravity. In the scope of this paper, test runs for the application of strapdown airborne and shipborne gravimetry are evaluated using an iMAR iNAV-RQH-1003 IMU. Results of the direct and the indirect methods are compared to each other. Additionally, a short introduction to the processing scheme of the Chekan-AM gravimeter data is given and differences between Chekan-AM and strapdown results of the shipborne campaigns are analysed. Using the same data set, the cross-over residuals suggest a similar accuracy of 0.39 mGal for the Chekan-AM and 0.41 mGal for the adjusted strapdown results (direct method).

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A Short Walk along the Gravimeters Path

Cited by 26 publications

References 25 publications

Geophysics From Terrestrial Time‐Variable Gravity Measurements

Geophysics From Terrestrial Time‐Variable Gravity Measurements

Gravity Method, Surface

Multi-Scenario Evaluation of the Direct Method in Strapdown Airborne and Shipborne Gravimetry

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