locate the center of the star image. The 1FOV will either remain in the track pattern until the star is lost, or it will automatically resume searching after a predetermined time interval (depending on mission requirements and sensor electronics).
If a photomultiplier is placed after the receiving aperture of the image dissector in a fixed-head star tracker, the instrument is referred to as an analog image dissector. Alternatively, if a photoelectron counter is used, the instrument is called a photon counting image dissector. The characteristics of several fixed-head star trackers using mage dissectors are listed in Table 6-6.
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