In-flight quality and accuracy of attitude measurements from the CHAMP advanced stellar compass
2004; Elsevier BV; Volume: 56; Issue: 1-2 Linguagem: Inglês
10.1016/j.actaastro.2004.09.012
ISSN1879-2030
AutoresPeter S. Jørgensen, John Leif Jørgensen, Troelz Denver, Maurizio Betto,
Tópico(s)GNSS positioning and interference
ResumoThe German geo-observations satellite CHAMP carries highly accurate vector instruments. The orientation of these relative to the inertial reference frame is obtained using star trackers. These advanced stellar compasses (ASC) are fully autonomous units, which provide, in real time, the absolute attitude with accuracy in the arc second range. In order to investigate the in-flight accuracy of the ASC, the terminology to characterize noise and biases is introduced. Relative instrument accuracy (RIA) and absolute instrument accuracy (AIA) can in principle be determined in-flight. However problems with modeling external noise sources often arise. The special CHAMP configuration with two star tracker cameras mounted fixed together provides an excellent opportunity to determine the AIA in-flight using the inter boresight angle.
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