Space Interferometry Mission: measuring the Universe

Marr, James C.; Dallas, S. S.; Laskin, Robert A.; Unwin, S.; Yu, Juanjuan

doi:10.1109/imtc.1999.777031

Cited by 4 publications

(2 citation statements)

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“…Pointing: We need to hold the pointing stable to about 300"micro-arcseconds and provide pointing information down to about 30 micro-arcseconds (Marr et al 1999). Drifts greater than 30 micro-arcseconds must not occur during the readout time of the CCD.…”

Section: Cashmentioning

confidence: 99%

X-ray Interferometry

Cash

2001

Symp. - Int. Astron. Union

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X-rays have tremendous potential for imaging at the highest angular resulution. The high surface brightness of many x-ray sources will reveal angular scales heretofore thought unreachable. The short wavelengths make instrumentation compact and baselines short. We discuss how practical x-ray interferometers can be built for astronomy using existing technology. We describe the Maxim Pathfinder and Maxim missions which will achieve 100 and 0.1 micro-arcsecond imaging respectively. The science to be tackled with resolution of up to one million times that of HST will be outlined, with emphasis on eventually imaging the event horizon of a black hole.

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Section: Cashmentioning

confidence: 99%

X-ray Interferometry

Cash

2001

Symp. - Int. Astron. Union

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“…In addition, these spacecrafts are large flexible deployed structures with a lot of optical elements. In order to meet high pointing accuracy and high stability requirements, it poses problems for attitude control system (Marr et al, 1999). Disturbances such as the orbital environment, onboard mechanical systems and sensors will cause vibration effects on spacecrafts and wobbles on the optical elements.…”

Section: Introductionmentioning

confidence: 99%

Development of methods identifying parameters in reaction wheel assembly disturbance model

Zhao

Sun

Hao

2006

Aircraft Engineering and Aerospace Technology

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Purpose -To set up the analytical model of reaction wheel assembly (RWA) by using the other theory and to provide a new method to identify the parameters of the empirical model of RWA. Design/methodology/approach -Setting up the analytical model of RWA using virtual work theory, and presents the energy compensation method. The energy compensation method to improve the computation accuracy of amplitude coefficients of the empirical model of RWA. In the empirical model of RWA, the assumption is that the disturbances consist of discrete harmonics, and the amplitudes is proportion to the square of the wheel speed. Findings -The errors of amplitude coefficients adopting energy compensation window excel the amplitude spectrum method. The energy compensation method improves the parameters identification accuracy, and provides a new method to set up more accurate empirical disturbance model of RWA. Practical implications -Providing a valuable identification method of amplitude coefficients of the empirical model of RWA, and improving the accuracy of identification. Originality/value -Putting forward up the method of energy compensation to identify the amplitude coefficients of the empirical model of RWA, and improving the accuracy. This method is simple, practical for the system design.

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<title>The Maxim Pathfinder Mission: x-ray imaging at 100 micro-arcseconds</title>

2000

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Ultra-high resolution imaging in the x-ray has the potential to revolutionize the way astronomers view the heavens. Through the use of interferometry at grazing incidence we can image the x-ray sky at the milliarcsecond (or better) level. . In this paper we describe the baseline design of the Maxim Pathfinder Mission, which will be the first interferometric x-ray observatory whose goal is to image the sky at 100 micro-arcsecond resolution in the 0.5-1.5keV band with about 100cm2 of collecting area. This resolution is adequate to image the coronae of nearby stars and the accretion disks of quasars.

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Space Interferometry Mission: measuring the Universe

Abstract: Abstract

Cited by 4 publications

References 0 publications

X-ray Interferometry

X-ray Interferometry

Development of methods identifying parameters in reaction wheel assembly disturbance model

<title>The Maxim Pathfinder Mission: x-ray imaging at 100 micro-arcseconds</title>

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