Preliminary results of GSS' optical observation with CCD drift-scan mode

Details Preliminary results of GSS' optical observation with CCD drift-scan mode Preliminary results of GSS' optical observation with CCD drift-scan mode

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007acasn..48..475m&link_type=abstract

Acta Astronomica Sinica, vol. 48, no. 4, p. 475-487

Astronomy and Astrophysics

Astronomy

1

Satellites: General, Methods: Observational

Scientific paper

There are two main ways for observing GSS (Geo-Stationary Satellite) in China now, that is, short time exposure with small optic-electric telescopes and tracking GSS or reference stars with astronomical telescopes. But, in fact, these two ways have their own disadvantages, specially for fainter objects. There are many obvious advantages that observing GSS and reference stars with stare mode and CCD drift scan mode by turns with small diameter telescope (about 25cm). This method can obtain not only good circular images of reference stars and GSS but also high precision coordinates of objects. The total internal errors of optical positioning results are better than 0.5as. There are three main parts of internal error source, the local reference system, the system clock, and the measurement coordinates of objects. Choosing suitable plate model and obtaining parameters of the chosen plate model and magnitude model of CCD are introduced. The method and the steps for computing high precision optical coordinates of objects are described in detail in this paper. Using actual results of data reduction, precision and source of internal errors are shown and analyzed finally.

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