Spin motion of the AJISAI satellite derived from spectral analysis of laser ranging data

Otsubo, Toshimichi; Amagai, Jun; Kunimori, Hiroo; Elphick, M.

doi:10.1109/36.843036

Cited by 34 publications

(13 citation statements)

References 7 publications

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“…The surface of the spinning satellite is scanned by these laser pulses, and the motion of the CCRs engraves a frequency signal on the SLR data. This signal can be obtained by spectral analysis (Lomb, 1976) of the unequally spaced range residuals data (measured minus predicted satellite range) (Otsubo et al, 2000;Bianco et al, 2001). SLR can measure spin periods of satellites during day and night, regardless to the sunsatellite -station geometry (as it is with photometry), and without any additional equipment.…”

Section: Satellite Spin Measurement Techniquesmentioning

confidence: 99%

“…The spin parameters of AJISAI were an object of several scientific investigations (Otsubo et al, 1998(Otsubo et al, , 2000Kirchner et al, 2007). The knowledge of spin period and spin axis orientation of the passive geodetic satellites allows for investigation and improvement of physical models of the perturbing forces which are of magnetic, gravitational and non-gravitational nature (Bertotti and Iess, 1991;Andrés et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

22Years of AJISAI spin period determination from standard SLR and kHz SLR data

Kucharski

Kirchner

Otsubo

et al. 2009

Advances in Space Research

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Section: Satellite Spin Measurement Techniquesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

22Years of AJISAI spin period determination from standard SLR and kHz SLR data

Kucharski

Kirchner

Otsubo

et al. 2009

Advances in Space Research

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“…The obtained center-of-mass corrections depend on the ranging system configuration and observation policy at the terrestrial stations and vary by about 1 cm for LAGEOS and 5 cm for Ajisai and Etalons. Otsubo et al (2000) demonstrated that the center-of-mass correction for Ajisai depends on the orientation of the satellite and can vary between 985 and 1,030 mm for a Gaussian profile of the incoming laser pulse with FWHM (full width at half maximum) of 200 ps.…”

Section: Normal Point Formation With Sigma Filtermentioning

confidence: 99%

A method to calculate zero-signature satellite laser ranging normal points for millimeter geodesy - a case study with Ajisai

Kucharski

Kirchner

Otsubo

et al. 2015

Earth, Planets and Space

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High repetition-rate satellite laser ranging (SLR) offers new possibilities for the post-processing of the range measurements. We analyze 11 years of kHz SLR passes of the geodetic satellite Ajisai delivered by Graz SLR station (Austria) in order to improve the accuracy and precision of the principal SLR data product -normal points. The normal points are calculated by three different methods: 1) the range residuals accepted by the standard 2.5 sigma filter, 2) the range residuals accepted by the leading edge filter and 3) the range residuals given by the single corner cube reflector (CCR) panels of Ajisai. A comparison of the statistical parameters of the obtained results shows that the selection of the range measurements from the leading edge of the SLR data distribution allows to minimize the satellite signature effect and to reduce the average single-shot RMS per normal point from 15.44 to 4.85 mm. The optical distance between the leading edge mean reflection point and the satellite's center of mass is 1,023 mm, RMS = 1.7 mm. Further, in addition, we utilize the complete attitude model of Ajisai during the post-processing which enables selection of the range measurements to the single CCR panels of the satellite and the formation of the normal points which most closely approximate the physical distance between the ground station and the center of mass of Ajisai. This method eliminates the satellite signature effect from the distribution of the post-fit range residuals and further improves the average single-shot RMS per normal point to 3.05 mm. The normal point RMS per pass is reduced from 2.97 to 0.06 mm -a value expected for a zero-signature satellite.

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“…Although the spherical satellites are designed to be less dependent on the angle of incidence, as a satellite spins, the optical response from a whole satellite varies with a time-varying angle of incidence (Otsubo et al 2000, Kucharski et al 2010). A response function is then defined as an optical response averaged over all angles of incidence.…”

Section: Single-photon Khz Laser Rangingmentioning

confidence: 99%

Center-of-mass corrections for sub-cm-precision laser-ranging targets: Starlette, Stella and LARES

Otsubo

Sherwood

Appleby

et al. 2014

J Geod

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To realise the full potential of satellite laser ranging for accurate geodesy, it is crucial that all systematic effects in the measurements are taken into account. This paper derives new values for the so-called centre-of-mass corrections for three geodetic satellites that are regularly tracked and used in geodetic studies. Optical responses of the twin satellites, Starlette and Stella, and the LARES satellite are retrieved from kHz single-photon laser ranging data observed at Herstmonceux and Potsdam. The detection timing inside single-photon systems, C-SPAD-based systems and photomultiplier-based systems is numerically simulated, and the center-of-mass corrections are derived to be in the range of 74 to 82 mm for Starlette and Stella, and 127 to 135 mm for LARES. The system dependence is below 1 cm, but should not be ignored for millimeter accuracy. The longtime standard center-of-mass correction 75 mm of Starlette and Stella is revealed to be too small for the current laser ranging stations on average, which is considered to have resulted in a non-negligible systematic error in geodetic products.

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Spin motion of the AJISAI satellite derived from spectral analysis of laser ranging data

Cited by 34 publications

References 7 publications

22Years of AJISAI spin period determination from standard SLR and kHz SLR data

22Years of AJISAI spin period determination from standard SLR and kHz SLR data

A method to calculate zero-signature satellite laser ranging normal points for millimeter geodesy - a case study with Ajisai

Center-of-mass corrections for sub-cm-precision laser-ranging targets: Starlette, Stella and LARES

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