[Isocops] CAR : Mon 6/14 1pm EDT : Lo Special Ops SCCB

Nathan Schwadron nschwadron at mac.com
Fri Jun 11 10:44:25 EDT 2010


Thanks Greg!!

Revised CAR attached. 

All, we will have to be mindful about the fact that we have normal mode voltage in bin 0. If despinning is required, we may have a little streak running through the high-res data. This will look very similar to the esa step 0 issue we have noticed. 

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Nathan

On Jun 11, 2010, at 9:23 AM, Dunn, Greg wrote:

> Setting a start or stop bin of 0 won't work, since a different task
> handles setting the voltages on spin boundaries.  To get 360 degree O
> mode, use 1/1 for the start/stop bins.  On spin boundaries, bin 0 will
> be set to the normal mode voltage, but all other bins will use the O
> mode setting.
> 
> -- Greg 
> 
>> -----Original Message-----
>> From: Nathan Schwadron [mailto:nschwadron at mac.com] 
>> Sent: Thursday, June 10, 2010 8:38 PM
>> To: Reno, Michelle
>> Cc: Harald Kucharek; Stephen Fuselier; David Heirtzler; Peter 
>> Wurz; Herb Funsten; Mark Tapley; Dan Reisenfeld; McComas, 
>> Dave; Eberhard Moebius; Dunn, Greg; Michelle Reno; isoc cops
>> Subject: Re: [Isocops] CAR : Mon 6/14 1pm EDT : Lo Special Ops SCCB
>> 
>> Hi All
>> 
>> I spoke to Stephen today and recommended that we run the 
>> O-mode with a start bin of 0 and a stop bin of 59. The 
>> rationale is as follows. If we have a start tracker outage 
>> during O-mode and view only part of the great circle (start 
>> bin > 0 and stop bin <59) then we would end up not being able 
>> to reconstruct the data. So we are still at risk if a star 
>> tracker outage occurs. On the other hand if we view the whole 
>> great circle (start bin = 0 and stop bin = 59) then we would 
>> *not* compromise the data in case of a star tracker outage. 
>> 
>> The downside of using a start bin =0 and a stop bin = 59 is 
>> that we will exclude some of the  normal viewing during an 
>> orbit. However, I do not see this as a big downside. If we 
>> want to have some normal viewing, then we could switch 
>> between the O-mode table 3 and ! a normal can choose. In this 
>> case, because we view full great circles (start bin = 0 and 
>> stop bin =59), both the normal viewing and the O-mode viewing 
>> would be insensitive to a star tracker outage. I view this as 
>> being a far more robust solution and I think it will be far 
>> more successful in the long run. 
>> 
>> Let me be clear that I am happy to perform the test with 
>> either the original CAR from Chelle or the slight revision attached. 
>> 
>> Nathan
>> 
>> 
> 
> 
> 
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