Unprecedented Vibration Isolation Demonstration Using the Disturbance-Free Payload Concept

Gonzales, Michael; Pedreiro, Nelson; Roth, Donald E.; Brookes, Kyle; Foster, Brian W.; Martin, Lockheed

doi:10.2514/6.2004-5247

Cited by 18 publications

(16 citation statements)

References 3 publications

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“…One stressing dynamic jitter stability requirement is that of telescope line-of-sight, because movement of the line-ofsight induces beamwalk on each optical element of the coronagraph, which degrades contrast through equation (5). The derived requirement on LOS RMS stability is 0.3 milli-arcseconds.…”

Section: Performance Versus Jitter Stability Requirementsmentioning

confidence: 96%

“…Computation of both of these contrast contributions utilize the frequency-dependent response as generated by the closed-loop structural dynamic system, and a pointing offset error. For example, in computation of LOS contrast via equation (5), this offset is denoted by Ω . The offset value used in the results of Figure 5-3 used an offset of 0.3 masec, obtained from the TPF-C error budget.…”

Section: Jitter Induced Contrastmentioning

confidence: 99%

“…The active design features sensors and actuators at the spacecraft-payload interface, together with closed-loop control to achieve pointing and vibration isolation. The active isolation design using the Disturbance Free Payload (DFP) architecture is being considered for TPF-C; this architecture, predicted performance and laboratory test activities are described in the literature 3,4,5 . The DFP application and performance for TPF-C form the subject of this paper.…”

Section: Introductionmentioning

confidence: 99%

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Precision telescope pointing and spacecraft vibration isolation for the Terrestrial Planet Finder Coronagraph

Dewell

Pedreiro

Blaurock³

et al. 2005

SPIE Proceedings

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The Terrestrial Planet Finder Coronagraph is a visible-light coronagraph to detect planets that are orbiting within the Habitable Zone of stars. The coronagraph instrument must achieve a contrast ratio stability of 2e-11 in order to achieve planet detection. This places stringent requirements on several spacecraft subsystems, such as pointing stability and structural vibration of the instrument in the presence of mechanical disturbance: for example, telescope pointing must be accurate to within 4 milli-arcseconds, and the jitter of optics must be less than 5 nm. This paper communicates the architecture and predicted performance of a precision pointing and vibration isolation approach for TPF-C called Disturbance Free Payload (DFP) * . In this architecture, the spacecraft and payload fly in close-proximity, and interact with forces and torques through a set of non-contact interface sensors and actuators. In contrast to other active vibration isolation approaches, this architecture allows for isolation down to zero frequency, and the performance of the isolation system is not limited by sensor characteristics. This paper describes the DFP architecture, interface hardware and technical maturity of the technology. In addition, an integrated model of TPF-C Flight Baseline 1 (FB1) is described that allows for explicit computation of performance metrics from system disturbance sources. Using this model, it is shown that the DFP pointing and isolation architecture meets all pointing and jitter stability requirements with substantial margin. This performance relative to requirements is presented, and several fruitful avenues for utilizing performance margin for system design simplification are identified.

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Section: Performance Versus Jitter Stability Requirementsmentioning

confidence: 96%

Section: Jitter Induced Contrastmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Precision telescope pointing and spacecraft vibration isolation for the Terrestrial Planet Finder Coronagraph

Dewell

Pedreiro

Blaurock³

et al. 2005

SPIE Proceedings

Self Cite

View full text Add to dashboard Cite

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“…The third approach uses an isolation platform with a very broad frequency response. This isolation platform is also known as the Disturbance Free Platform [ 11 ] and has over 60 dB of isolation from 0.1 to 100 Hz. The uncompensated micro-vibration estimate was performed for many spacecraft vibration power spectral densities (PSD's).…”

Section: Vibration Compensationmentioning

confidence: 99%

Star tracker based ATP system conceptual design and pointing accuracy estimation

Ortiz

Lee

2006

SPIE Proceedings

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A star tracker based beaconless (a.k.a. non-cooperative beacon) acquisition, tracking and pointing concept for precisely pointing an optical communication beam is presented as an innovative approach to extend the range of high bandwidth (> 100 Mbps) deep space optical communication links throughout the solar system and to remove the need for a ground based high power laser as a beacon source. The basic approach for executing the ATP functions involves the use of stars as the reference sources from which the attitude knowledge is obtained and combined with high bandwidth gyroscopes for propagating the pointing knowledge to the beam pointing mechanism. Details of the conceptual design are presented including selection of an orthogonal telescope configuration and the introduction of an optical metering scheme to reduce misalignment error. Also, estimates are presented that demonstrate that aiming of the communications beam to the Earth based receive terminal can be achieved with a total system pointing accuracy of better than 850 nanoradians (3 sigma) from anywhere in the solar system.

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“…Option 2: The vibration isolation solution under the second option is based on Lockheed-Martin patented Disturbance Free Payload (DFP) architecture 22,23,24,25 . In that architecture (Figure 14), aside from electrical power and data cables bridging the interface, the instrument and the gimbal are mechanically isolated, thereby providing a high-degree of vibration attenuation.…”

Section: Pointing Control Systemmentioning

confidence: 99%

Arcus: an ISS-attached high-resolution x-ray grating spectrometer

et al. 2014

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We present the design and scientific motivation for Arcus, an X-ray grating spectrometer mission to be deployed on the International Space Station. This mission will observe structure formation at and beyond the edges of clusters and galaxies, feedback from supermassive black holes, the structure of the interstellar medium and the formation and evolution of stars. The mission requirements will be R>2500 and >600 cm 2 of effective area at the crucial O VII and O VIII lines, values similar to the goals of the IXO X-ray Grating Spectrometer. The full bandpass will range from 8-52Å (0.25-1.5 keV), with an overall minimum resolution of 1300 and effective area >150 cm 2 . We will use the silicon pore optics developed at cosine Research and proposed for ESA's Athena mission, paired with off-plane gratings being developed at the University of Iowa and combined with MIT/Lincoln Labs CCDs. This mission achieves key science goals of the New Worlds, New Horizons Decadal survey while making effective use of the International Space Station (ISS).

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Unprecedented Vibration Isolation Demonstration Using the Disturbance-Free Payload Concept

Cited by 18 publications

References 3 publications

Precision telescope pointing and spacecraft vibration isolation for the Terrestrial Planet Finder Coronagraph

Precision telescope pointing and spacecraft vibration isolation for the Terrestrial Planet Finder Coronagraph

Star tracker based ATP system conceptual design and pointing accuracy estimation

Arcus: an ISS-attached high-resolution x-ray grating spectrometer

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