Laser metrology for next generation gravity mission

Bonino, Luciana; Cesare, Stefano; Massotti, Luca; Mottini, Sergio; Nicklaus, Kolja; Pisani, Marco; Silvestrin, Pierluigi

doi:10.1109/mim.2017.8121946

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…The NGGM will use a laser interferometer as primary payload for measuring d . More specifically, a Michelson-type interferometer in the heterodyne version has been selected as particularly suitable for measurements over very long distances (Bonino et al 2017). It will operate with a continuous-wave source at 1064 nm wavelength, stabilized in frequency against the physical length of a high finesse optical cavity made of ultra-low expansion material, thermally insulated and controlled.…”

Section: Next-generation Gravity Missionmentioning

confidence: 99%

On Earthquake Detectability by the Next-Generation Gravity Mission

et al. 2020

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Earthquakes have been studied by means of seismometers recording the elastic waves travelling through the interior of our planet. Global Navigation Satellite System and Synthetic Aperture Radar surveys, measuring surface displacements, have provided additional information on earthquakes, as well as on those solid Earth processes responsible for them, such as subduction, collision and extension and the inter-seismic strain accumulation. This instrumentation is deployed over land and thus misses the seas, often surrounding regions where large earthquakes occur. This limitation is nowadays overcome by space gravity missions, thanks to their uniform coverage of the Earth, both inland and offshore. In this perspective, Gravitational Seismology has been identified as a new application of the Next-Generation Gravity Mission (NGGM), with the aim of evaluating its overall performance and of assessing the detectability of earthquake gravity signatures, as well as of those from active tectonics and inter-seismic deformation. Within the framework of self-gravitating viscoelastic Earth models, we have simulated the co- and post-seismic gravity signatures of 291 scenario earthquakes, with different occurrence times and geographical locations, focal mechanisms, depths and lines of strike, and included into the background gravity feeding the NGGM closed-loop simulation which provides observables of multiple pairs of GRACE-like satellites, given the instrument noise. NGGM earthquake detectability is herein defined on the possibility of estimating the amplitude of the original gravity signature of each earthquake by inversion of synthetic NGGM gravity data, consisting of 156 28-day gravity field solutions (about 11 years). For about two thirds of earthquakes of magnitude as low as 7, comparable with the 1980 Irpinia intraplate earthquake, the amplitudes have been estimated with a relative error less than 10% (and less than 50% for almost all the earthquakes), assuming as known the time variable contributions from atmosphere, oceans, hydrology, continental ice and glacial isostatic adjustment. When these contributions are inverted simultaneously with the earthquake ones, instead, we have had to increase the earthquake magnitude to 7.8 in order to estimate more than half of their amplitudes with a relative error less than 10%. We thus have shown that the NGGM will be able to detect, in most cases, the co- and post-seismic signatures of earthquakes of at least magnitude 7.8 and that this lower magnitude threshold can decrease down to magnitude 7 by improving the modelling of the background gravity field.

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Section: Next-generation Gravity Missionmentioning

confidence: 99%

On Earthquake Detectability by the Next-Generation Gravity Mission

et al. 2020

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“…Fig.14Auxiliary metrology: Operating concept for link acquisition (left) and bread-board (right),[5] …”

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confidence: 99%

The “Next Generation Gravity Mission”: challenges and consolidation of the system concepts and technological innovations

Dionisio

Anselmi

Bonino

et al. 2018

2018 SpaceOps Conference

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Following the success of GRACE and GOCE, the scientific communities and the space agencies have started to focus their attention towards the preparation of a future gravity mission, for the time being called Next Generation Gravity Mission (NGGM). Such a mission requires a quantum leap not only in the ranging sensor, such as that provided by laser interferometry in place of microwave sensing, but also a parallel improvement in the performance of the satellite subsystems dedicated to attitude and disturbance control, where the GOCE experience will be brought to bear.This paper focuses on the NGGM challenges, at mission and system levels, and on the main technological innovations needed to face them. The laser interferometry techniques and the metrology under development for achieving the precise pointing of the laser beams between the spacecraft are also described. In particular, an overview is given of the main results of the "Consolidation of the system concept for the Next Generation Gravity Mission" study, carried out for ESA by Thales Alenia Space in Italia [6].

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Stringent three-axis stability control for novel non-contact satellite using embedded second-order noise estimator

Liao

Xie

et al. 2022

Advances in Space Research

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Laser metrology for next generation gravity mission

Cited by 5 publications

References 7 publications

On Earthquake Detectability by the Next-Generation Gravity Mission

On Earthquake Detectability by the Next-Generation Gravity Mission

The “Next Generation Gravity Mission”: challenges and consolidation of the system concepts and technological innovations

Stringent three-axis stability control for novel non-contact satellite using embedded second-order noise estimator

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