BOKZ Star Instrument Family
BOKZ Star Instrument Family
BOKZ Star Instrument Family
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<strong>BOKZ</strong> <strong>Star</strong> <strong>Instrument</strong> <strong>Family</strong><br />
In-orbit processing results<br />
The operating star trackers – <strong>BOKZ</strong> and <strong>BOKZ</strong>-M – can be considered<br />
prototypes for the instruments should which provide for controlling s/c<br />
angular motion parameters in nominal operation conditions without any<br />
support by other systems of the s/c housekeeping system.<br />
This operation mode was proved on the Yamal-200, Cosmos-2410,<br />
Cosmos-2420 and Resurs-DK spacecraft.<br />
Non-nominal operation conditions are as follows:<br />
– S/c angular velocity exceeds the value admissible<br />
for certain star instrument modification.<br />
– There are bright natural objects (the Sun, the Earth and the Moon)<br />
within the instrument's field of view.<br />
– There are artificial objects (space debris)<br />
within the instrument's field of view.
<strong>BOKZ</strong> <strong>Star</strong> <strong>Instrument</strong> <strong>Family</strong><br />
SC trajectory with the attitude control break<br />
due to the Sun illumination<br />
Углы ориентации, гр.<br />
350<br />
300<br />
250<br />
200<br />
150<br />
100<br />
50<br />
0<br />
12:57:36 13:12:00 13:26:24 13:40:48 13:55:12 14:09:36 14:24:00 14:38:24<br />
-50<br />
-1 00<br />
Область<br />
з ас ветки<br />
alfa<br />
delta<br />
Az
<strong>BOKZ</strong> <strong>Star</strong> <strong>Instrument</strong> <strong>Family</strong><br />
Period of <strong>Star</strong> tracker non-operation<br />
due to the Sun illumination<br />
ОZ БОКЗ-М2<br />
14:20:08<br />
ϕ С =23°26’<br />
Солнце<br />
ОZ БОКЗ-М2<br />
14:07:06<br />
ϕ С =24°58’
<strong>BOKZ</strong> <strong>Star</strong> <strong>Instrument</strong> <strong>Family</strong><br />
Artificial objects<br />
An image of a particle with a size of 150 µm at a<br />
distance of 2.8 m from the <strong>BOKZ</strong> instrument onboard<br />
the Yamal-200 spacecraft
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