System verification of the JMEX mission residual motion requirements with integrated modeling

Lieber, Michael D.; Randall, Christopher R.; Ayari, Laoucet; Schneider, Nicholas M.; Holden, Tim; Osterman, Steve; Arboneaux, Lloyd

doi:10.1117/12.617685

Cited by 1 publication

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We find that, for sinusoidal image motion described by x Asin t = ω , the spread in the residuals scales roughly with the maximum image acceleration 2 max a A = ω . Figure 11 is log-log plot of the standard deviation of the residuals vs. this maximum image acceleration 2 Aω . It is the acceleration, rather than the velocity, which degrades the performance, since simple linear motion is effectively a DC frequency and places no strain on the interpolation algorithm.…”

Section: Resultsmentioning

confidence: 99%

“…The total number of pixels in the disk is 2 R π , and the total number of counts in the entire disk is…”

Section: Appendix: the Centroid Uncertainty Of A Bright Uniform Diskmentioning

confidence: 99%

“…Because the satellite is small and light, its pointing stability is quite sensitive to reaction wheel rumble. 1,2 Although well damped, the vibrations cause satellite rotational jitter, which if uncorrected, would produce pointing errors with an amplitude of up to 5" at a frequencies up to 1 Hz. The pointing errors must be corrected because the science mission requires high-resolution imaging (0.25") during time-exposures of up to 5 minutes.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Photon-by-photon post-processing correction of pointing errors in an orbiting satellite

Dubson

Schneider

Osterman

2005

UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts II

Self Cite

View full text Add to dashboard Cite

The Jupiter Magnetosphere Explorer (JMEX) is a proposed earth-orbiting satellite which will image the planet Jupiter in the FUV with a 0.5 m telescope at 0.25 arcsec (") resolution. Because the satellite is small and lightweight, vibrations from the reaction wheels (even though isolated by dampers) produce random pointing errors with an amplitude as large as 5" at a frequency around 1 Hz. In order for the telescope to achieve a resolution of 0.25" FWHM during long exposures, we will use a novel post-processing scheme to correct the pointing error. The UV science camera is a photon-counting MCP detector which produces data as a time-stamped photon list with 0.08" spatial resolution and roughly 1 ms temporal resolution. Simultaneously, a 0.5" pixel video camera, fed by a pickoff mirror in the main beam, captures visible images of the planet's disk at 30Hz and, with onboard processing, the centroid of the planet is determined, frame-by-frame, with a resolution <0.02" (1/25 pixel). With inter-frame interpolation, each photon from the UV camera is position-corrected in ground post-processing to an accuracy of 0.02".To rigorously test this scheme, we have constructed a hardware mock-up consisting of a tip-tilt mirror, a beamsplitter, and two video cameras with controlled noise characteristics. The tip-tilt mirror produces controlled image motion over a range of amplitudes and frequencies. With all parameters at worst-case values, we have verified the specified performance of the system and achieved centroid correction close to the limit set by counting noise statistics.

show abstract

Section: Resultsmentioning

confidence: 99%

“…The total number of pixels in the disk is 2 R π , and the total number of counts in the entire disk is…”

Section: Appendix: the Centroid Uncertainty Of A Bright Uniform Diskmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Photon-by-photon post-processing correction of pointing errors in an orbiting satellite

Dubson

Schneider

Osterman

2005

UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts II

Self Cite

View full text Add to dashboard Cite

show abstract

System verification of the JMEX mission residual motion requirements with integrated modeling

Cited by 1 publication

References 0 publications

Photon-by-photon post-processing correction of pointing errors in an orbiting satellite

Photon-by-photon post-processing correction of pointing errors in an orbiting satellite

Contact Info

Product

Resources

About