1,726,259 research outputs found
Canuto Hinojosa el día de su boda II
No full textI.O. Canuto Hinojosa Existe un original más. V.F. 293
Drag-free and attitude control for the GOCE satellite
Full text linkThe paper concerns Drag-Free and Attitude Control of the European satellite Gravity field and steady-state Ocean Circulation Explorer (GOCE) during the science phase. Design has followed Embedded Model Control, where a spacecraft/environment discrete-time model becomes the realtime control core and is interfaced to actuators and sensors via tuneable feedback laws. Drag-free control implies cancelling non-gravitational forces and all torques, leaving the satellite to free fall subject only to gravity. In addition, for reasons of science, the spacecraft must be carefully aligned to the local orbital frame, retrieved from range and rate of a Global Positioning System receiver. Accurate drag-free and attitude control requires proportional and low-noise thrusting, which in turn raises the problem of propellant saving. Six-axis drag-free control is driven by accurate acceleration measurements provided by the mission payload. Their angular components must be combined with the star-tracker attitude so as to compensate accelerometer drift. Simulated results are presented and discusse
All-propulsion design of the drag-free and attitude control of the European satellite GOCE
Full text linkThis paper concerns the drag-free and attitude control (DFAC) of the European Gravity field and steady-state Ocean Circulation Explorer satellite (GOCE), during the science phase. GOCE aims to determine the Earth's gravity field with high accuracy and spatial resolution, through complementary space techniques such as gravity gradiometry and precise orbit determination. Both techniques rely on accurate attitude and drag-free control, especially in the gradiometer measurement bandwidth (5-100mHz), where non-gravitational forces must be counteracted down to micronewton, and spacecraft attitude must track the local orbital reference frame with micro-radian accuracy. DFAC aims to enable the gravity gradiometer to operate so as to determine the Earth's gravity field especially in the so-called measurement bandwidth (5-100mHz), making use of ion and micro-thruster actuators. The DFAC unit has been designed entirely on a simplified discrete-time model (Embedded Model) derived from the fine dynamics of the spacecraft and its environment; the relevant control algorithms are implemented and tuned around the Embedded Model, which is the core of the control unit. The DFAC has been tested against uncertainties in spacecraft and environment and its code has been the preliminary model for final code development. The DFAC assumes an all-propulsion command authority, partly abandoned by the actual GOCE control system because of electric micro-propulsion not being fully developed. Since all-propulsion authority is expected to be imperative for future scientific and observation missions, design and simulated results are believed to be of interest to the space communit
Por Andres Gonzalez Canuto vezino de la villa de Membrilla en el pleyto contra doña Maria Canuto vezina de la dicha villa. Sobre la possession del vinculo y mayorazgo que fundò Aluaro Canuto
No full textA 110/123(13
Título: A sorte
No full textDedicatoria: "A mi María"En portada: "precio 3 pesetas"Data de publicación baseada no "Catálogo de partituras del Archivo Canuto Berea en la Biblioteca de la Diputación de A Coruña, María Dolores Liaño Pedreira, 1999N. 1. A xolda : canción popular / poesía de F.G. -- N. 2. Afrixida / poesía de F.G. -- N. 3. Na fiada : canción popular -- N. 4. ¡Pesóulle! / poesía de F.G. -- N. 5. A bordo / poesía de F.G. -- N. 6. A sorte / poesía de F.G. -- N. 7. A ruada / poesía de F.G
Título: Non te quero por bonita
No full textPortada ilustradaDedicatoria: "A mi María"En portada: "precio 3 pesetas"Data de publicación baseada no "Catálogo de partituras del Archivo Canuto Berea en la Biblioteca de la Diputación de A Coruña, María Dolores Liaño Pedreira, 1999N. 1. Miña terra, miña terra - n. 2. Canta o galo ven o día - n. 3. Frouseira triste Frouseira - n. 4. Séntate n'esta pedriña - n. 5. A noite de San Xoán - n. 6. Non te quero por bonit
Un sospiro : melodía / letra de M. Martínez González ; música de C. Berea
No full text1 partitura (3 páxinas) ; 34 c
- …
