[Isocops] Fwd: [Ibex-soc] Notes: TELECON 2:30 Eastern Thurs 5/27 RE: Orbit# 80 ATS (3 June-11 June 10)
Nathan Schwadron
nathanas at bu.edu
Sat May 29 13:44:04 EDT 2010
Begin forwarded message:
> From: "Reno, Michelle" <mreno at swri.edu>
> Date: May 28, 2010 2:51:50 PM EDT
> To: "Reno, Michelle" <mreno at swri.edu>, "Reno, Michelle" <michelle.reno at swri.org
> >, "Ibex Mission Operations" <ibexops at gmail.com>, "Bret Hautamaki" <hautamaki.bret at orbital.com
> >, "IBEX-FDG" <IBEX.fdg at applieddefense.com>, "IBEXOPS/BU" <ibexops at bu.edu
> >, "IBEXOPS/ORB" <IBEXops at orbital.com>, "Mark Tapley" <mark.tapley at swri.org
> >, "Robert Lockwood" <Lockwood.Robert at orbital.com>, "Roland
> Vanderspek" <rvdspek at bu.edu>, "Ryan Tyler" <tyler.ryan at orbital.com>,
> "Sheral Wesley" <wesley.sheral at orbital.com>, "Tim Perry" <perry.tim at orbital.com
> >, "Walker Cross" <Cross.Walker at orbital.com>,
> <Kirn.Sean at orbital.com>, "Dunn, Greg" <gregory.dunn at swri.org>,
> "Hanley, John" <john.hanley at swri.org>, "John Cavallo" <cavallo.john at orbital.com
> >, <Regiec.Thomas at orbital.com>
> Subject: [Ibex-soc] Notes: TELECON 2:30 Eastern Thurs 5/27 RE:
> Orbit# 80 ATS (3 June-11 June 10)
>
> Sean's writeup attached
>
> · What we will do :
> o DESCENDING - 3h prior to eclipse start
> o enter Housekeeping
> o LE Flag = TRUE - 2h prior to eclipse start
> o LE Flag = FALSE - 0200 (~11h after eclipse exit)
>
> The rest of the notes :
>
> o80 Long Eclipse Meeting
> · Attendees : Robert Lockwood, Sean Kirn, Mark Tapley, Geoff
> Crew, Paul Janzen, Jodi Wilson, Roland Vanderspek, Ken Fairchild,
> Nathan Schwadron, Chelle Reno, Ryan Tyler, Tim Perry, Ryan Lebois,
> Sheral Wesley, Dave McComas, Greg Dunn, John Scherrer
> · Ryan Tyler:
> o RT Caveat : Based on a crude power model in MPS - the point is
> to do more analysis - still has power neg. when transmitter on - EOL
> + margin
> o cell voltage falls below 6.3V minimum in analysis
> o 3.6V go to Contingency (load shed 1) - P/L Safes
> o 3.5V SCB starts turning things off (load shed 2)
> o risk to battery is below 2.75V (no risk here)
> o this eclipse lasts 3h but never hits full umbra - hits 99.8%
> penumbra
> o eclipse times should match up well
> · Sean
> o made aprox. with the power budget - get 33% of solar array on
> avg. below 5% illum.
> o SA - we are entering a 20min solid (umbra) eclipse
> o heater power may be needed
> o blah : add up w/ heater & 17357 Wm ; SA gen ; Batt 9400 Wm ;
> have the ability to go
> o right on the border of what the battery can handle
> o SEAN IS USING THE UPDATED PERFORMANCE NUMBERS
> o heater power assumption is probably high, but don't know how
> high; it neglects partial sun
> · FD&C
> o trigger off of the lowest cell; noisy low cell won't do it, but
> if persistent it will trigger
> · Simplest course per Ryan set LE flag to try & did nothing
> else :
> o If we set the LE flag we buy the margin
> o technical downside
> § 008 Hi sees variation in counts - singles backgrounds
> § Wouldn't want to use SCI data from then anyway
> § Hi is Ok with turning down LOW
> o no downside if we
>
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Chelle Reno
> Austin Mission Consulting
> 106 E. 6th St. Ste. 939
> Austin, TX 78701
> (512) 704-3394 (o)
> (210) 478-7337 (c)
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
>
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Chelle Reno
> Austin Mission Consulting
> 106 E. 6th St. Ste. 939
> Austin, TX 78701
> (512) 704-3394 (o)
> (210) 478-7337 (c)
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> From: Reno, Michelle
> Sent: Thu 5/27/2010 12:39 PM
> To: Reno, Michelle; Ibex Mission Operations; Bret Hautamaki; IBEX-
> FDG; IBEXOPS/BU; IBEXOPS/ORB; Mark Tapley; Robert Lockwood; Roland
> Vanderspek; Ryan Tyler; Sheral Wesley; Tim Perry; Walker Cross; Kirn.Sean at orbital.com
> ; Dunn, Greg; Hanley, John; John Cavallo; Regiec.Thomas at orbital.com
> Subject: RE: Supporting Materials: TELECON 2:30 Eastern Thurs 5/27
> RE: Orbit# 80 ATS (3 June-11 June 10)
>
> 866-750-1362
> 7727 484#
>
> · The problem :
>
> ==========================
>
> SOFT CONSTRAINT VIOLATIONS
>
> ==========================
>
> IBX-CLC-015: Battery charge falls below minimum from 2010/06/10
> 14:16:56 UTC -
>
> 2010/06/10 23:12:00 UTC. Lowest charge level is 0.000000
>
> watt-minutes during this interval.
>
>
>
>
>
> · The current timeline :
> o 06/07/10 14:00:00, LAHO 2K IBEX Orbit# 80 Apogee Contact
> o 06/10/10 13:26:56, EclipseEntry,orbit:80,long:false
> o 06/10/10 14:16:56, Battery charge falls below minimum
> o 06/10/10 16:30:25, EclipseExit,orbit:80,long:false
> o 06/10/10 21:30:00, LAHO 40K IBEX Tracking Contact
> o 06/10/10 23:12:00, Battery charge rises above minimum
> o 06/11/10 14:30:00, LAHO 320K IBEX SSR_Dump/ Tracking
>
> · The timeline w/o the 2130 contact : rise above min charge
> ~1h earlier
> o 06/07/10 14:00:00, LAHO 2K IBEX Orbit# 80 Apogee Contact
> o 06/10/10 13:26:56, EclipseEntry,orbit:80,long:false
> o 06/10/10 14:16:56, Battery charge falls below minimum
> o 06/10/10 16:30:25, EclipseExit,orbit:80,long:false
> o 06/10/10 25:07:25, Battery charge rises above minimum
> o 06/11/10 14:30:00, LAHO 320K IBEX SSR_Dump/ Tracking
>
> colors:
> Eclipse entry/exit
> Minimum charge violation start/stop
> Contacts
>
>
> From: Reno, Michelle [mailto:michelle.reno at swri.org]
> Sent: Wed 5/26/2010 3:41 PM
> To: Reno, Michelle; Ibex Mission Operations; Bret Hautamaki; IBEX-
> FDG; IBEXOPS/BU; IBEXOPS/ORB; John Cavallo; Mark Tapley; Robert
> Lockwood; Roland Vanderspek; Ryan Tyler; Sheral Wesley; Thomas
> Regiec; Tim Perry; Walker Cross; Kirn.Sean at orbital.com; Dunn, Greg;
> Hanley, John
> Subject: Supporting Materials: TELECON 2:30 Eastern Thurs 5/27 RE:
> Orbit# 80 ATS (3 June-11 June 10)
>
> ATS & planning files attached. Ryan's CCVR explanation below :
>
>
> From: Ryan Tyler [mailto:Tyler.Ryan at orbital.com]
> Sent: Wed 5/26/2010 2:06 PM
> To: Reno, Michelle
> Cc: John Cavallo; Walker Cross; Bret Hautamaki; IBEXOPS/ORB; IBEXOPS/
> BU; Ibex Mission Operations; IBEX-FDG; Robert Lockwood; Mark Tapley;
> Tim Perry; Thomas Regiec; Roland Vanderspek; Sheral Wesley
> Subject: RE: [Ibex-soc] IBEX Orbit# 80 ATS (3 June-11 June 10)
>
> Chelle,
>
> This caught my eye too. Running it in STK with the latest ephemeris
> file
> from FDG, here's a flip-book version of what's going to happen, with
> the
> moon passing almost (99.8%) completely over the Earth:
>
> (Embedded image moved to file: pic14423.jpg)
>
>
> Because it's only 99.8% rather than 100%, MPS thinks of the whole
> thing as
> penumbra, which it calculates (I think rightly) as having a discharge
> equivalent to half as long in umbra. This is probably fine given
> that MPS
> also let us know about the constraint violation.
>
> Anyway, it's a bit hard to be too definitive about anything here
> because we
> don't really have a value for how much power we're getting off the
> array of
> what the total dissipation is throughout the mission. What we do
> know is
> that eclipses are the only thing that put us power negative (as
> opposed to
> our pre-launch, conservative prediction of being power negative when
> the
> transmitter is o! n or when hrusters are on), so that
> means that we're doing better than initial predictions in this area. I
> tweaked the power profile spreadsheet accordingly and found that this
> coming eclipse is slightly worse in terms of battery discharge than a
> typical 60 minute Earth eclipse. That is, the total event lasts
> longer, but
> for most of the event there is more than the 0W of solar array power
> that
> are available during a normal Earth eclipse, so the discharge is
> slower.
> This estimate, by the way, includes the fact that the payload is on
> during
> this eclipse while it is off during normal Earth eclipses.
>
> My first guess, based on this info, is that we'll be able to run
> through
> this eclipse, maybe getting down to 3.65V. But there's a lot of
> uncertainty
> here, and 3.65V is pretty close to the load shed threshold. To
> reduce the
> risk of going into contingency state due to hitting the load shed
> threshold, I suggest doing at least one of two things:
>
> 1! . Power d early. It looks like we'd be talking
> about a half day or so early.
> 2. Set the long eclipse flag to TRUE.
>
> I'm not sure if the payload would want to do #2 without doing #1.
>
> We could do these things without going through the normal full "long
> eclipse" procedure of shutting everything (star tracker, etc.) down
> and
> going to survival heater setpoints. To do #1, we'd simply edit the
> start
> times on the descending macro commands. To do #2, we'd simply add the
> command to set the long eclipse flag to the ATS an hour or so before
> the
> start of the eclipse, then send the command to go back to normal
> during the
> first contact after the eclipse. Finally, we'd want to make sure
> that there
> are no contacts during the eclipse.
>
> Anyway, that's my advice for this.
>
> Ryan
>
>
> |------------>
> | From: |
> |------------>
>
> >
> -----------------------------------------------------------------------! --------- -----------------------------------------|
> |"Reno, Michelle"
> <
> mreno
> @swri
> .edu
> >
> |
>
> >
> --------------------------------------------------------------------------------------------------------------------------------------------------|
> |------------>
> | To: ! &nb ;
>
> >
> --------------------------------------------------------------------------------------------------------------------------------------------------|
> |"Ibex Mission Operations" <ibexops at gmail.com>, "Bret Hautamaki" <hautamaki.bret at orbital.com
> >, "IBEX-FDG" <IBEX.fdg at applieddefense.com>, |
> |"IBEXOPS/BU" <ibexops at bu.edu>, "IBEXOPS/ORB"
> <IBEXops at orbital.com>, "John Cavallo" <cavallo.john at orbital.com>,
> "Mark Tapley" |
> |<mark.tapley at swri.org>, "Robert Lockwood" <Lockwood.Robert at orbital.com
> >, "Roland Vanderspek" <rvdspek at bu.edu>, "Ryan
> Tyler" |
> |<tyler.ryan at orb! ital.com& wesley.sheral at orbital.com>, "Thomas
> Regiec" <regiec.thomas at orbital.com>, "Tim Perry" |
> |<perry.tim at orbital.com>, "Walker Cross"
> <
> Cross
> .Walker
> @orbital
> .com
> >
> |
>
> >
> --------------------------------------------------------------------------------------------------------------------------------------------------|
> |------------>
> | Date: &n! bsp; |
>
> |05/26/2010 12:53
> PM
> |
> >------------------------------! ---------
> ----------------------------------------------------------------------------------|
> |------------>
> | Subject: |
> |------------>
>
> >
> --------------------------------------------------------------------------------------------------------------------------------------------------|
> |RE: [Ibex-soc] IBEX Orbit# 80 ATS (3 June-11 June
> 10
> ) |
> >----------------------------------------! ---------
> ------------------------------------------------------------------------|
>
>
>
>
>
> Can someone explain this constraint violation to me, and either a)
> why we
> are ok with it or b) what we can do about it. Do we need to go
> through the
> long eclipse process?
>
> ==========================
> SOFT CONSTRAINT VIOLATIONS
> ==========================
> IBX-CLC-015: Battery charge falls below minimum from 2010/06/10
> 14:16:56
> UTC -
> 2010/06/10 23:12:00 UTC. Lowest charge level is 0.000000
> watt-minutes during this interval.
>
> * IBEX_2010_Orbit80_v001.oef that corresponds to the BATTERY CHARGE
> MESSAGE
> above*
> 2010-06-10T13:26:56.571Z,PenumbraEntry,orbit:80
> 2010-06-10T13:26:56.571Z,EclipseEntry,orbit:80,long:false
> 2010-06-10T16:30:25.887Z,PenumbraExit,orbit:80
> 2010-06-10T16:30:25.887Z,EclipseEx! it,orbit: 10T23:40:53.986Z,
> 15RECrossing,direction:desc,orbit:80
> 2010-06-11T03:41:51.074Z,10RECrossing,direction:desc,orbit:80,oMode:0
>
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Chelle Reno
> Austin Mission Consulting
> 106 E. 6th St. Ste. 939
> Austin, TX 78701
> (512) 704-3394 (o)
> (210) 478-7337 (c)
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> From: ibex-soc-bounces at skynet.bu.edu on behalf of Ibex Mission
> Operations
> Sent: Wed 5/26/2010 7:40 AM
> To: Bret Hautamaki; IBEX-FDG; IBEXOPS/BU; IBEXOPS/ORB; John Cavallo;
> Mark
> Tapley; Robert Lockwood; Roland Vanderspek; Ryan Tyler; Sheral Wesley;
> Thomas Regiec; Tim Perry; Walker Cross
> Subject: [Ibex-soc] IBEX Orbit# 80 ATS (3 June-11 June 10)
>
> Guys,
> Here is the ATS for Orbit# 80 (3-11 June 10)
> The ATS will be uploaded during one of the Orbit# 78 Perigee contacts
> listed below in UTC
> IBEX,AUWA01,ADD,05/27/10,147,02:00:00,05/27/10,147,02:35:00,,LAHO 2K
> IBEX
> Orbit #78 Tracking Contact
> IB! EX,AUWA01 0,05/27/10,147,13:15:00,,LAHO 320K IBEX
> SSR_Dump/Tracking
> IBEX,USHI01,ADD,05/28/10,148,11:30:00,05/28/10,148,12:05:00,,LAHO
> 40K IBEX
> Orbit# 78 Post Burn Contact
>
> Orbit # 80 Command Load Constraint Violation Report (CCVR)
> ==========================
> SOFT CONSTRAINT VIOLATIONS
> ==========================
> IBX-CLC-015: Battery charge falls below minimum from 2010/06/10
> 14:16:56
> UTC -
> 2010/06/10 23:12:00 UTC. Lowest charge level is 0.000000
> watt-minutes during this interval.
>
> * IBEX_2010_Orbit80_v001.oef that corresponds to the BATTERY CHARGE
> MESSAGE
> above*
> 2010-06-10T13:26:56.571Z,PenumbraEntry,orbit:80
> 2010-06-10T13:26:56.571Z,EclipseEntry,orbit:80,long:false
> 2010-06-10T16:30:25.887Z,PenumbraExit,orbit:80
> 2010-06-10T16:30:25.887Z,EclipseExit,orbit:80,long:false
> 2010-06-10! T23:40:53 ion:desc,orbit:80
> 2010-06-11T03:41:51.074Z,10RECrossing,direction:desc,orbit:80,oMode:0
>
>
>
> --
> Sheral R. Wesley
> SPVR., Satellite Operations
> IBEX Mission OPS
> (304) 279-6678
>
>
>
> -----------------------------------------
> Notice: This e-mail is intended solely for use of the individual
> or entity to which it is addressed and may contain information that
> is proprietary, privileged and exempt from disclosure under
> applicable law. If the reader is not the intended recipient or
> agent responsible for delivering the message to the intended
> recipient, you are hereby notified that any dissemination,
> distribution or copying of this communication is strictly
> prohibited. This communication may also contain data subject to
> U.S. export laws. If so, that data subject to the International
> Traffic in Arms Regulation cannot be disseminated, distributed or
> copied to foreign nationals, residing in the U.S.! or abroa prior
> approval of the U.S. Department of State. If
> you have received this communication in error, please notify the
> sender by reply e-mail and destroy the e-mail message and any
> physical copies made of the communication. Thank you.
>
>
> Please restrict discussions on this email list to non-ITAR sensitive
> topics.
> _______________________________________________
> Ibex-soc mailing list
> Ibex-soc at skynet.bu.edu
> http://skynet.bu.edu/cgi-bin/mailman/listinfo/ibex-soc
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.sr.unh.edu/mailman/private/isocops/attachments/20100529/d61e8035/attachment-0002.html
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 20100527_lunar_eclipse_analysis.doc
Type: application/msword
Size: 94208 bytes
Desc: not available
Url : http://lists.sr.unh.edu/mailman/private/isocops/attachments/20100529/d61e8035/attachment-0001.doc
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.sr.unh.edu/mailman/private/isocops/attachments/20100529/d61e8035/attachment-0003.html
More information about the Isocops
mailing list