Gravity Gradiometry – Today and Tomorrow

DiFrancesco, Dan; Meyer, Thomas J.; Christensen, Asbjørn Nørlund; FitzGerald, Desmond

doi:10.3997/2214-4609-pdb.241.difrancesco_paper1

Cited by 23 publications

(10 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A number of publications have extensively highlighted the technical history and mathematical details on the setup and the operating principles of different gravity gradiometers (DiFrancesco et al, 2009a(DiFrancesco et al, , 2009bJekeli, 1993Jekeli, , 2011Richeson, 2008;Veryaskin, 2018;Wells, 1984). Many other studies have also been found to discuss different approaches and methods for airborne and terrestrial navigation using the GPS integrated gravity gradiometer system (Bobojć & Drożyner, 2003;Paik & Morgan, 1993;Pei et al, 2017;Richeson, 2008;Sun et al, 2016aSun et al, , 2016b.…”

Section: Gravity Gradiometry/ Literature Surveymentioning

confidence: 99%

“…Today, as the technological development of gravity gradiometer instruments enhance their measurement sensitivity, one of the biggest challenges is to isolate the gravity gradient measurements from the disturbing sources (DiFrancesco et al, 2009a(DiFrancesco et al, , 2009b. This is because with the enhanced measurement sensitivity the resolution of a gravity gradient measurement improves; however, this also improves the resolution of disturbing sources by the same amount (DiFrancesco et al, 2009a(DiFrancesco et al, , 2009b.…”

Section: Gravity Gradiometry/ Literature Surveymentioning

confidence: 99%

See 1 more Smart Citation

Sensitivity Analysis of Precision Inertial Sensor‐based Navigation System (SAPIENS)

Bhatia

Geller

2020

Navigation

View full text Add to dashboard Cite

The future of deep space exploration depends upon technological advancement towards improving spacecraft's autonomy and versatility. This study aims to examine the feasibility of autonomous orbit determination using advanced accelerometer measurements. The objective of this research is to ascertain specific sensor requirements to meet pre-defined mission navigation error budgets. Traditional inertial navigation (dead reckoning and external aiding) is not considered. Instead, measurements from pairs of advanced, highly sensitive accelerometers (e.g., cold atom accelerometers) are used onboard to determine gravity field gradients, which are then correlated to onboard gravity maps and used to determine orbital information. Linear Covariance Theory helps to efficiently conduct an error budget analysis of the system. This error budget analysis helps to determine the effect of specific error sources in the sensor measurements, thereby providing information to rank and compare relevant sensor parameters and determine an optimal sensor configuration for a given space mission. The procedure is repeated to evaluate different accelerometer configurations and sensor parameters.

show abstract

Section: Gravity Gradiometry/ Literature Surveymentioning

confidence: 99%

Section: Gravity Gradiometry/ Literature Surveymentioning

confidence: 99%

Sensitivity Analysis of Precision Inertial Sensor‐based Navigation System (SAPIENS)

Bhatia

Geller

2020

Navigation

View full text Add to dashboard Cite

show abstract

“…Over the past few decades, the airborne rotating gravity gradiometer has been proven to be a powerful tool in geodetic surveys and mineral exploration [ 1 , 2 , 3 , 4 ]. Spurred by its successful applications, a number of new technologies have been developed with the motivation to update the resolution in the future for airborne gravity gradients measurement [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Tuning the Stiffness Balance Using Characteristic Frequencies as a Criterion for a Superconducting Gravity Gradiometer

Liu

Chen

2018

Sensors

View full text Add to dashboard Cite

Tuning the stiffness balance is crucial to full-band common-mode rejection for a superconducting gravity gradiometer (SGG). A reliable method to do so has been proposed and experimentally tested. In the tuning scheme, the frequency response functions of the displacement of individual test mass upon common-mode accelerations were measured and thus determined a characteristic frequency for each test mass. A reduced difference in characteristic frequencies between the two test masses was utilized as the criterion for an effective tuning. Since the measurement of the characteristic frequencies does not depend on the scale factors of displacement detection, stiffness tuning can be done independently. We have tested this new method on a single-component SGG and obtained a reduction of two orders of magnitude in stiffness mismatch.

show abstract

“…Novel gravity gradiometer is of great importance in geodetic surveys, resource explorations, and inertial navigations [ 1 , 2 , 3 , 4 , 5 ]. Over the last century, different technologies have been applied to the developments of gravity gradiometers.…”

Section: Introductionmentioning

confidence: 99%

A Subnano-g Electrostatic Force-Rebalanced Flexure Accelerometer for Gravity Gradient Instruments

Yan

Xie

Zhang

et al. 2017

Sensors

View full text Add to dashboard Cite

A subnano-g electrostatic force-rebalanced flexure accelerometer is designed for the rotating accelerometer gravity gradient instrument. This accelerometer has a large proof mass, which is supported inversely by two pairs of parallel leaf springs and is centered between two fixed capacitor plates. This novel design enables the proof mass to move exactly along the sensitive direction and exhibits a high rejection ratio at its cross-axis directions. Benefiting from large proof mass, high vacuum packaging, and air-tight sealing, the thermal Brownian noise of the accelerometer is lowered down to less than 0.2 ng/Hz with a quality factor of 15 and a natural resonant frequency of about 7.4 Hz. The accelerometer’s designed measurement range is about ±1 mg. Based on the correlation analysis between a commercial triaxial seismometer and our accelerometer, the demonstrated self-noise of our accelerometers is reduced to lower than 0.3 ng/Hz over the frequency ranging from 0.2 to 2 Hz, which meets the requirement of the rotating accelerometer gravity gradiometer.

show abstract

Gravity Gradiometry – Today and Tomorrow

Cited by 23 publications

References 2 publications

Sensitivity Analysis of Precision Inertial Sensor‐based Navigation System (SAPIENS)

Sensitivity Analysis of Precision Inertial Sensor‐based Navigation System (SAPIENS)

Tuning the Stiffness Balance Using Characteristic Frequencies as a Criterion for a Superconducting Gravity Gradiometer

A Subnano-g Electrostatic Force-Rebalanced Flexure Accelerometer for Gravity Gradient Instruments

Contact Info

Product

Resources

About