Spin axis orientation of Ajisai determined from Graz 2kHz SLR data

Kucharski, D.; Otsubo, Toshimichi; Kirchner, Georg; Koidl, Franz

doi:10.1016/j.asr.2010.03.029

Cited by 23 publications

(7 citation statements)

References 15 publications

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“…The satellite was placed in a quasi-circular orbit at a height of 1490 km (inclination 50º). The spin parameters of Ajisai have been investigated scientifically (Kucharski et al, 2009b, 2010a, 2010b, Otsubo et al, 19982000) showing an exponential decrease of the spin rate and a precession of its spin axis. The knowledge of the spin parameters of the passive satellites allows for the investigation and improvement of physical models of the perturbing forces and torques which are of magnetic, gravitational and non-gravitational nature (Andrés et al, 2004, Bertotti et al, 1991.…”

Section: The Experimental Geodetic Satellitementioning

confidence: 99%

“…-slowly spinning LAGEOS-1, LAGEOS-2 (Kucharski et al, 2007, Kucharski et al, 2009a, -High Earth Orbiting Etalon-1 and Etalon-2 (Kucharski et al, 2008), -fast spinning Ajisai (Kirchner et al, 2007;Kucharski et al, 2009bKucharski et al, , 2010aKucharski et al, , 2010b, -active Gravity Probe -B, equipped with a small CCR panel, -the first spherical lens type satellite BLITS (Kucharski et al, 2011).…”

Section: Techniques For Spin Measurementsmentioning

confidence: 99%

“…Ajisai is spinning around its symmetry axis and the orientation of the spin axis in the inertial reference frame is known (Kucharski et al, 2010b). In order to correct the apparent signal given by the spectral analysis a series of simulations are performed using the spin rate of the body as a parameter.…”

Section: The Simulation Model Consists Of Two Partsmentioning

confidence: 99%

See 2 more Smart Citations

Spectral Analysis of Borowiec SLR Data For Spin Determination Of Geodetic Satellite EGP

Kucharski¹,

Schillak²,

Lim³

et al. 2013

Artificial Satellites

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Borowiec 10 Hz Satellite Laser Ranging (SLR) station is capable to measure spin of the Japanese Experimental Geodetic Satellite (EGP). Spectral analysis of 391 passes measured from March 10, 1994 to November 27, 2009 gives frequency signal representing the 3 rd and the 6 th harmonics of the satellite spin rate. Analysis of this signal, corrected for the apparent effects, indicates en exponential slowing down of the satellite: the spin rate decreases according to the equation f = 671.115907 • exp(-4.08324 x 10 -5 • D) [mHz], where D is a day after launch. More than 15 years of the SLR measurements allowed investigating the initial spin rate of the satellite f ini = 671.116, RMS = 0.203 [mHz] (initial spin period T ini = 1.49006, RMS = 0.0007 [s]).

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Section: The Experimental Geodetic Satellitementioning

confidence: 99%

Section: Techniques For Spin Measurementsmentioning

confidence: 99%

See 1 more Smart Citation

Spectral Analysis of Borowiec SLR Data For Spin Determination Of Geodetic Satellite EGP

Kucharski¹,

Schillak²,

Lim³

et al. 2013

Artificial Satellites

Self Cite

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“…The epoch times of the minimum deviation events throughout the pass can be predicted by the complete attitude model of Ajisai. The spin axis orientation of the satellite (in J2000.0 celestial reference frame) during a single pass can be predicted with RMS of 0.128° (Kucharski et al 2010b(Kucharski et al , 2013a. The spin period and the rotational phase angle of Ajisai can be obtained during the post-processing of a complete pass with RMS of 84 μs (42 ppm) for the spin period and with RMS of 0.48°for the phase angle (Kucharski et al 2010a).…”

Section: Slr Measurements To Ajisai At Graz Observatorymentioning

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 axis orientation of Ajisai determined from Graz 2kHz SLR data

Cited by 23 publications

References 15 publications

Spectral Analysis of Borowiec SLR Data For Spin Determination Of Geodetic Satellite EGP

Spectral Analysis of Borowiec SLR Data For Spin Determination Of Geodetic Satellite EGP

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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