Fig. 6-39. Cutaway Diagram of Image Dissector Tube Star Sensor

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.

Table 6-6. Fixed-Head Star Trackers Using Image Dissectors

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