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ISO star tracker response to radiation

The following information concerning the ISO star tracker (STR) response to the radiation environment has been provided by J. Faelker at Vilspa:

Indirectly, the STR may experience the impact of impinging trapped particles or cosmic rays, which will disturb the search/tracking function when tracking a star, or during the acquisition process of a star. However, the STR does not provide a means to measure the background count rate, like a radiation counter of type Cerenkov. A single event upset (SEU) may or may not be detected autonomously as FALSE EVENT by the STR, because the tracking window is very small (8 x 8 pixels) wrt to the 3 x 4 STR FOV (284 x 372 pixels). We do maintain FALSE EVENT statistics, but due to the before hand mentioned realities, the contents are not representative.

For questions, comments, and further information, please contact P. Nieminen at ESA/ESTEC.



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