A Note on Geodetic Ties among Several Reference Points by Different Space Geodetic Techniques at Syowa Station, Antarctica.

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  • 南極・昭和基地における各種宇宙技術を用いた測地基準点間の取り付け測量について
  • Note on Geodetic Ties among Several Ref

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There are four reference points by different space geodetic techniques at Syowa Station (69.0°S, 39.5°E), Antarctica; satellite Doppler point, Very Long Baseline Interferometry (VLBI) reference point, Scientific Committee on Antarctic Research (SCAR) Global Positioning System (GPS) point and Doppler Orbitography by Radiopositioning Integrated by Satellites (DORIS) beacon point. Local geodetic ties among these reference points were made, taking several occasions. GPS relative positioning was made at the periphery of the 11 m S/X-band parabolic antenna reflector with respect to the SCAR GPS point. The center location of the peripheral circle of the reflector pointing at zenith was estimated by a nonlinear least squares method with a set of geocentric coordinates of the attached GPS antenna locations. Since the separation between the VLBI reference point and the reflector center determined above is known from the mechanical design, relative location of the VLBI reference point (R) to the SCAR GPS point (G) can be estimated. The accuracy of the obtained offset vector RG = (-11.69 m, -74.08 m, -12.01 m) was ±0.26 m, ±0.25 m and ±0.07 m for each component. As for local tie between the DORIS beacon point and the SCAR GPS point, and between the satellite Doppler point and the SCAR GPS point, the accuracy of the obtained offset vector is within 1 cm for each component.

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