The spinning Astrid-2 satellite used for modeling the Earth's main magnetic field

Merayo, José M.G.; Brauer, Peter; Primdahl, F.; Joergensen, P. S.; Risbo, T.; Cain, J. C.

doi:10.1109/tgrs.2002.1006371

Cited by 12 publications

(7 citation statements)

References 13 publications

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“…In flight, when the field changes rapidly over the full scale range, the instrument's performance was limited by the 1-2 nT ADC-non-linearities. The Earth's field modelling residuals were less than 5 nT rms , comparing favorably to the Ørsted modelling residuals of 2-3 nT rms , stemming mainly from the non-modelled magnetospheric perturbations (Merayo et al, 2002). Technical information on the instrument's noise and stability performance can be found in this paper and in references therein.…”

Section: Instrument Designmentioning

confidence: 72%

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EMMA - the Electric and Magnetic Monitor of the Aurora on Astrid-2

et al. 2004

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Abstract. The Astrid-2 mission has dual primary objectives. First, it is an orbiting instrument platform for studying auroral electrodynamics. Second, it is a technology demonstration of the feasibility of using micro-satellites for innovative space plasma physics research. The EMMA instrument, which we discuss in the present paper, is designed to provide simultaneous sampling of two electric and three magnetic field components up to about 1 kHz. The spin plane components of the electric field are measured by two pairs of opposing probes extended by wire booms with a separation distance of 6.7 m. The probes have titanium nitride (TiN) surfaces, which has proved to be a material with excellent properties for providing good electrical contact between probe and plasma. The wire booms are of a new design in which the booms in the stowed position are wound around the exterior of the spacecraft body. The boom system was flown for the first time on this mission and worked flawlessly. The magnetic field is measured by a tri-axial fluxgate sensor located at the tip of a rigid, hinged boom extended along the spacecraft spin axis and facing away from the Sun. The new advanced-design fluxgate magnetometer uses digital signal processors for detection and feedback, thereby reducing the analogue circuitry to a minimum. The instrument characteristics as well as a brief review of the science accomplished and planned are presented.

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Section: Instrument Designmentioning

confidence: 72%

“…EMMA data were recently used to ascertain the Weimer 2K ionospheric electric field model (Eriksson et al, 2002). EMMA data have also been used as a complement to the Danish Ørsted satellite for mapping of the geomagnetic field (Merayo et al, 2002). …”

Section: Scientific Objectives and Resultsmentioning

confidence: 99%

EMMA - the Electric and Magnetic Monitor of the Aurora on Astrid-2

et al. 2004

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“…The fluxgate technology has been improving simultaneously with the techniques of magnetic field sensing and now fluxgates are still the sensors that present the best magnetic properties for the measurement of the geomagnetic field. It has to be taken into account that an increase in the knowledge about the magnetic field of the Earth only can be achieved by means of very fine measurements since actual models of the field already reproduce the contribution of the core, the crust and the ionospheric phenomena to the global field, thanks to the data provided by POGO-Polar Orbiting Geophysical Observation missions (1967–1971), Magsat (1979), Astrid-2 (1998) [ 56 ], SAC-A (1998), Ørsted (1999), Komsat (1999), CHAMP (2000), ST-5 (2006) [ 15 ], etc.…”

Section: Magnetic Sensors For Space Missions the Implementation Of Mmentioning

confidence: 99%

Small Magnetic Sensors for Space Applications

Díaz-Michelena

2009

Sensors

202

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Small magnetic sensors are widely used integrated in vehicles, mobile phones, medical devices, etc for navigation, speed, position and angular sensing. These magnetic sensors are potential candidates for space sector applications in which mass, volume and power savings are important issues. This work covers the magnetic technologies available in the marketplace and the steps towards their implementation in space applications, the actual trend of miniaturization the front-end technologies, and the convergence of the mature and miniaturized magnetic sensor to the space sector through the small satellite concept.

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“…Firstly, they are inexpensive, small and lightweight. Secondly, they are robust and complete in the sense that sun sensors and star sensors are vulnerable to occultation 1) . Furthermore, magnetic sensors are applicable to wide-range of body rate.…”

Section: Introductionmentioning

confidence: 99%

Robust Attitude Determination for Spacecraft with Magnetic Sensors

Yoshikawa

Nishiyama

2009

Trans. JSASS Space Tech. Japan

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This paper presents a new attitude determination algorithm for a spacecraft in low earth orbits using magnetic sensors and rate sensors (e.g. quartz rate sensor gyros) for generic missions including earth observations. The algorithm is applicable to mainly a three-axis spacecraft, including when it is tumbling just after the separation from a launch vehicle or due to some anomaly. The advantage of the proposed approach is that it does not require additional attitude sensors such as sun sensors. First, an attitude determination algorithm using only magnetic sensors is introduced presuming that the attitude change during the measurement period is very small. Then the algorithm is extended to combine magnetic sensors with rate sensors, where both the three-axis attitude and rate sensor biases are estimated. The estimation error is statistically analyzed. Numerical examples are given to validate the proposed algorithm and its accuracy evaluation.

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The spinning Astrid-2 satellite used for modeling the Earth's main magnetic field

Cited by 12 publications

References 13 publications

EMMA - the Electric and Magnetic Monitor of the Aurora on Astrid-2

EMMA - the Electric and Magnetic Monitor of the Aurora on Astrid-2

Small Magnetic Sensors for Space Applications

Robust Attitude Determination for Spacecraft with Magnetic Sensors

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