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imagerteleconnotes20180124

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imagerteleconnotes20180124 [2018/01/24 15:34] – wenxx181imagerteleconnotes20180124 [2018/02/01 11:29] (current) – bcrill
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 Attitude control Attitude control
   * Shaul: Pointing Control is how well spacecraft points at a direction; Pointing Knowledge is how well we know where it points at; Pointing stability is how stable pointing is in terms of changing rate.   * Shaul: Pointing Control is how well spacecraft points at a direction; Pointing Knowledge is how well we know where it points at; Pointing stability is how stable pointing is in terms of changing rate.
 +  * Ben: thinking about map to understand definitions of pointing knowledge, control and stability; that's how engineers talk about them.
   * PICO rquires 6 arcsec pointing knowledge, which about 1/10 of the smallest beam.   * PICO rquires 6 arcsec pointing knowledge, which about 1/10 of the smallest beam.
   * Shaul thinks we do not need more than 1 degree of pointing control.   * Shaul thinks we do not need more than 1 degree of pointing control.
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   * Jacques: 3 star sensors garuntees 1'' pointing knowledge. This is the easiest and likely to be reasonable in cost.  Worth just using 3.   * Jacques: 3 star sensors garuntees 1'' pointing knowledge. This is the easiest and likely to be reasonable in cost.  Worth just using 3.
   * Jacques: Thoughts from CORE,   * Jacques: Thoughts from CORE,
-    * Pointing control is to eliminate gaps in map. 24'' ensures no gaps in single detector maps. +  * Pointing control is to eliminate gaps in map. 24'' ensures no gaps in single detector maps. 
-    * 24'' was technically doable for Core with reaction wheels.  Should check if that is true for PICO, if the engineers don't scream, then stop worrying about it. +  * 24'' was technically doable for Core with reaction wheels.  Should check if that is true for PICO, if the engineers don't scream, then stop worrying about it. 
-      * Shaul: reaction wheels are current assumption for PICO+  * Shaul: reaction wheels are current assumption for PICO
   * **A/I** Shaul to check with Amy about 24'' control with wheels.   * **A/I** Shaul to check with Amy about 24'' control with wheels.
 +
 +  * Additional note from Brendan: Planck achieved 2 arcsecond rms pointing reconstruction [[https://wiki.cosmos.esa.int/planckpla2015/index.php/Detector_pointing|(see Planck Explanatory Supplement)]]
 +
  
 I + T, lessons from Planck, options for PICO. (Tomo) I + T, lessons from Planck, options for PICO. (Tomo)
imagerteleconnotes20180124.1516829662.txt.gz · Last modified: 2018/01/24 15:34 by wenxx181

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