scholarly journals Next-Generation Gravity Missions: Sino-European Numerical Simulation Comparison Exercise

2019 ◽  
Vol 11 (22) ◽  
pp. 2654 ◽  
Author(s):  
Roland Pail ◽  
Hsien-Chi Yeh ◽  
Wei Feng ◽  
Markus Hauk ◽  
Anna Purkhauser ◽  
...  
Keyword(s):  
Closed Loop ◽  
Software Systems ◽  
European Study ◽  
Next Generation ◽  
Joint Activities ◽  
Gravity Fields ◽  
Study Team ◽  
Height Fields ◽  
Temporal Gravity ◽  
Comparison Exercise

Temporal gravity retrieval simulation results of a future Bender-type double pair mission concept, performed by five processing centers of a Sino-European study team, have been inter-compared and assessed. They were computed in a synthetic closed-loop simulation world by five independent software systems applying different gravity retrieval methods, but were based on jointly defined mission scenarios. The inter-comparison showed that the results achieved a quite similar performance. Exemplarily, the root mean square (RMS) deviations of global equivalent water height fields from their true reference, resolved up to degree and order 30 of a 9-day solution, vary in the order of 10% of the target signal. Also, co-estimated independent daily gravity fields up to degree and order 15, which have been co-estimated by all processing centers, do not show large differences among each other. This positive result is an important pre-requisite and basis for future joint activities towards the realization of next-generation gravity missions.

Future Gravity Mission Concepts for Sustained Observation of Mass Transport in the Earth System

2021 ◽  
Author(s):  
Roland Pail
Keyword(s):  
Mass Transport ◽  
Closed Loop ◽  
Cold Atom ◽  
Radial Component ◽  
Transport Processes ◽  
Single Pair ◽  
Earth System ◽  
Next Generation ◽  
The Earth ◽  
Gravity Mission

<p>Next Generation Gravity Missions are expected to enhance our knowledge of mass transport processes in the Earth system, establishing their products applicable to new scientific fields and serving societal needs. Compared to the current situation (GRACE Follow-On), a significant step forward to increase spatial and temporal resolution can only be achieved by new mission concepts, complemented by improved instrumentation and tailored processing strategies.</p><p>In extensive numerical closed-loop mission simulations studies, different mission concepts have been studied in detail, with emphasis on orbit design and resulting spatial-temporal ground track pattern, enhances processing and parameterization strategies, and improved post-processing/filtering strategies. Promising candidates for a next-generation gravity mission are double-pair and multi-pair constellations of GRACE/GRACE-FO-type satellites, as they are currently jointly studied by ESA and NASA. An alternative concept is high-precision ranging between high- and low-flying satellites. Since such a constellation observes mainly the radial component of gravity-induced orbit perturbations, the error structure is close to isotropic, which significantly reduces artefacts of along-track ranging formations. This high-low concept was proposed as ESA Earth Explorer 10 mission MOBILE and is currently further studies under the name MARVEL by the French space agency. Additionally, we evaluate the potential of a hybridization of electro-static and cold-atom accelerometers in order to improve the accelerometer performance in the low-frequency range.</p><p>In this contribution, based on full-fledged numerical closed-loop simulations with realistic error assumptions regarding their key payload, different mission constellations (in-line single-pair, Bender double-pair, multi-pairs, precise high-low tracking) are assessed and compared. Their overall performance, dealiasing potential, and recovery performance of short-periodic gravity signals are analyzed, in view of their capabilities to retrieve gravity field information with short latencies to be used for societally relevant service applications, such as water management, groundwater monitoring, and forecasting of droughts and floods.</p>

UBIQUITOUS INFORMATION AGENTS

2002 ◽  
Vol 11 (03n04) ◽  
pp. 231-244 ◽  
Author(s):  
FEDERICO BERGENTI ◽  
AGOSTINO POGGI
Keyword(s):  
Everyday Life ◽  
Mobile Applications ◽  
Software Systems ◽  
Cellular Phones ◽  
Next Generation ◽  
Information Agents ◽  
Near Future

Ubiquity is one of the most important keyword of the next generation software systems. We want our systems to follow users wherever they go, and we want our systems to extend their reach to the telephony world and to its base of several hundred million users. The ever-increasing diffusion of handy appliances, e.g. palmtops and cellular phones, is familiarizing people with the use of computers for their everyday job and, more impressively, for their everyday life. This suggests that the market of software systems for mobile applications will increase dramatically in the near future.

scholarly journals Editorial: Closed-Loop Systems for Next-Generation Neuroprostheses

2018 ◽  
Vol 12 ◽  
Author(s):  
Timothée Levi ◽  
Paolo Bonifazi ◽  
Paolo Massobrio ◽  
Michela Chiappalone
Keyword(s):  
Closed Loop ◽  
Next Generation ◽  
Closed Loop Systems

scholarly journals Closed-loop neuromuscular electrical stimulation using feedforward-feedback control and textile electrodes to regulate grasp force in quadriplegia

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
John Ciancibello ◽  
Kevin King ◽  
Milad Alizadeh Meghrazi ◽  
Subash Padmanaban ◽  
Todd Levy ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Feedback Control ◽  
Closed Loop ◽  
Neuromuscular Electrical Stimulation ◽  
Study Participant ◽  
Loop Control ◽  
Individual Finger ◽  
Finger Flexion ◽  
Study Team ◽  
Grasp Force

Abstract Background Transcutaneous neuromuscular electrical stimulation is routinely used in physical rehabilitation and more recently in brain-computer interface applications for restoring movement in paralyzed limbs. Due to variable muscle responses to repeated or sustained stimulation, grasp force levels can change significantly over time. Here we develop and assess closed-loop methods to regulate individual finger forces to facilitate functional movement. We combined this approach with custom textile-based electrodes to form a light-weight, wearable device and evaluated in paralyzed study participants. Methods A textile-based electrode sleeve was developed by the study team and Myant, Corp. (Toronto, ON, Canada) and evaluated in a study involving three able-body participants and two participants with quadriplegia. A feedforward-feedback control structure was designed and implemented to accurately maintain finger force levels in a quadriplegic study participant. Results Individual finger flexion and extension movements, along with functional grasping, were evoked during neuromuscular electrical stimulation. Closed-loop control methods allowed accurate steady state performance (< 15% error) with a settling time of 0.67 s (SD = 0.42 s) for individual finger contact force in a participant with quadriplegia. Conclusions Textile-based electrodes were identified to be a feasible alternative to conventional electrodes and facilitated individual finger movement and functional grasping. Furthermore, closed-loop methods demonstrated accurate control of individual finger flexion force. This approach may be a viable solution for enabling grasp force regulation in quadriplegia. Trial registration NCT, NCT03385005. Registered Dec. 28, 2017

Improving Driver Identification for the Next-Generation of In-Vehicle Software Systems

2019 ◽  
Vol 68 (8) ◽  
pp. 7406-7415 ◽  
Author(s):  
Abdellah El Mekki ◽  
Afaf Bouhoute ◽  
Ismail Berrada
Keyword(s):  
Software Systems ◽  
Next Generation ◽  
Driver Identification
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