[Isocops] USN Hawaii 26 Oct 2010 @1700

Tue Oct 26 17:23:57 EDT 2010

Chelle,
    This contact was scheduled for 2k and from the ATS we were configured
for 2k. We tried for 5 minutes to get the signal to lock up. USN kept on
seeing negative numbers for EB/NO readings. We tried to re-sweep a couple
of times with no success. We took down the command uplink to see if we
could lock up on a non-coho signal and no success. I finally tried to
resend the command for a 2k downlink and all of a sudden we locked up on
data EB/NO was from  24 to 32 DB. I have seen on previous spacecraft where
you will get just a straight carrier wave with no modulation on it. Why it
happened I don't know. Resending the transmitter commands would normally
correct the problem. I suspect resending the 2k tlm command cleared the
problem. So, that's why I suspected it was a spacecraft problem.
     Tim

Timothy E. Perry
IBEX, GEMS Mission Ops Lead
Orbital Sciences Corp
Space Systems Group
Office: (703) 406-5976
Cell: (301) 606-1430
perry.tim at orbital.com

  From:       "Reno, Michelle" <mreno at swri.edu>                                                                             

  To:         "Tim Perry" <Perry.Tim at orbital.com>, <IBEX.fdg at applieddefense.com>, <ibexops at gmail.com>, "John Cavallo"       
              <Cavallo.John at orbital.com>, "Ed Fleming" <Fleming.Ed at orbital.com>, "Thomas Regiec"                            
              <Regiec.Thomas at orbital.com>, "Robert Lockwood" <Lockwood.Robert at orbital.com>, "Bret Hautamaki"                
              <Hautamaki.Bret at orbital.com>, <isocops at lists.sr.unh.edu>, "Ryan Tyler" <Tyler.Ryan at orbital.com>               

  Date:       10/26/2010 04:06 PM                                                                                           

  Subject:    RE: [Isocops] USN Hawaii 26 Oct 2010 @1700                                                                    

Hi Tim,

Can you explain why this was a S/C issue? Were we on the edge of the null?

Chelle

~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Chelle Reno
Austin Mission Consulting
(210) 478-7337 (c)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

From: isocops-bounces at lists.sr.unh.edu on behalf of Tim Perry
Sent: Tue 10/26/2010 2:47 PM
To: IBEX.fdg at applieddefense.com; ibexops at gmail.com; John Cavallo; Ed
Fleming; Thomas Regiec; Robert Lockwood; Bret Hautamaki;
isocops at lists.sr.unh.edu; Ryan Tyler
Subject: [Isocops] USN Hawaii 26 Oct 2010 @1700

All,
     The Hawaii support started off a bit rocky, but improved with time. We
lost the first 5 minutes of data due to reasons unknown. USN was seeing a
very weak signal with high fluctuations in the EB/NO power. Commanded the
down link to 2k and we locked up with a stable signal. EB/NO ranged from
24.5 to 32.4, Spacecraft was then commanded up to 40k and saw an EB/NO of
12 to 16. CAR 418 was executed with no problems. Post Star tracker image
dump, I tried to dump the FCBO data but was not able to complete the dump
prior to the end of the support. I did not dump any of the SSR due to lack
of time post Startracker dump. Since the problem seemed to be with the
spacecraft and not the ground station I did not fail the support.
     Tim

Timothy E. Perry
IBEX, GEMS Mission Ops Lead
Orbital Sciences Corp
Space Systems Group
Office: (703) 406-5976
Cell: (301) 606-1430
perry.tim at orbital.com

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