ACE Weekly 07/19/2011 - 07/25/2011

All ACE spacecraft subsystems are performing nominally.

========================================================================
Orbit/Attitude:

No maneuvers were performed this week.  The next attitude maneuver is
scheduled for Wednesday 08/03/2011.

=======================================================================
OCRs:

None


========================================================================
Activities:

Data Capture:  100%  DOY 198-205 2011

The GRAIL mission is expected to launch 09/08/2011.  ACE has reduced DSN
antenna time during September.  The current schedule has ACE losing ~15%
data over 3 weeks in September.  The data loss will be greater if there
are problems with any of the passes.

The new network from the Air Force Satellite Control Network (AFSCN) to
the NOAA Space Weather Prediction Center (SWPC) was successfully tested
on Friday 07/22/2011.  NOAA SWPC requests time with AFSCN when the 3
main site have problems (NICT/Japan, DLR/Germany, WCDA/Wallops).  The
old network from AFSCN to NOAA SWPC was disconnected on 9/1/2010 with
the closing of the Onizuka Air Force Base.  A combination of Air Force
approval and funding issues were the reasons that it took a year to
implement the new network.

DSN ground station DSS-27 returned to service on Monday 07/25/2011.
DSS-27 had been down for 4 weeks (since 6/27/2011) for an Antenna
Controller Replacement (ACR), a 250-Watt S-Band Uplink Install and Cable
Wrap Protection.  Fortunately, ACE was able to acquire antenna time on
other DSN stations during this time.  (ACE did give up passes on
7/7/2011 and 7/9/2011 for the Chandra mission while they were in
safe-mode.  That only resulted in data loss when DSN had problems on
7/8/2011.)

A DSS-27 Return To Service Demo was performed on Tuesday 7/19/2011.  The
MMOC automation took the pass and no obvious problems were found.

The DSS-27 antenna previously had a 200 Watt transmitter that has now
been upgraded to 250 Watt.  The 25% increase in transmitter performance
will only result in an extra 1 dBm.  ACE uses the same DSN configuration
for DSS-27, DSS-45 and DSS-65.  DSS-45 and DSS-65 already have 250 Watt
transmitters, but had been limited to 200 Watts for consistent ACE
configurations.  All 3 (27,45,65) will now be be configured for 250
Watts starting on 7/19/2011 (DSN OPD-ACE-018).

The following table shows the 6 DSN ground antennas that ACE uses.  The
signal strength for the HGA depends on the HGA angle and the values
given are averages.  The extra 1 dBm from the 250 Watt DSN transmitters
will be a minimal benefit.

	                 Uplink     Power at spacecraft
	Ground Antenna    Power   RcvrA(HGA)         RcvrB(BroadBeam)
	----------------  -----  ------------------------------------
	34m BWG 24,34,54  2000W   -85dBm 3.2e-12W   -100dBm 1.0e-13W
	34m HEF 45,65      200W   -96dBm 2.5e-13W   -112dBm 6.3e-15W
	34m HSB 27         200W   -98dBm 1.6e-13W   -114dBm 4.0e-15W

	Low Signal Strength:  Yellow = -120dBm   Red = -130dBm

========================================================================
Anomalies:

None


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