on beam line II and started calibration on March 29.
The XPS is essentially 100% complete. Additional environmental and
EMI-EMC testing has been completed and previous PFR's (problem failure
report) items have been successfully resolved. A picture is worth
a thousand words, so...
Data System Status
Mass: 2.25 kg
Power: 3.4 W
Size: 18.7 cm x 17.6 cm x 15.6 cm
Most long term database code is now written and being tested, capabilities
to utilize command and telemetry database are being added. Ancillary
services development continues, spacecraft orbit services are 95%
complete, interpolation, integration, spline algorithms and operators
to propagate uncertainties have been added to the math utilities,
and the astronomy library is still 90% complete. Spacecraft attitude
server multimission design pattern and code is in place and generic
attitude processing algorithms are implemented. Attitude telemetry
information from Orbital has been received and is now being examined.
When orbit services are complete, SORCE specific attitude software
development will begin. General science algorithms have seen progress
in wavelength determination/ calibration and aperture area calibration.
SOLSTICE science processing development has been made in dark correction,
dead time correction, responsivity calibration access and responsivity
determination algorithm. Monthly telecons with ESDIS are ongoing,
the next scheduled for April 19. A schedule to drive development
and testing of interfaces between ESDIS and SORCE is underway.
Unit & Flight Software Status MU Status
The flight MU is 33% complete. The MU PCI I/O board SSI command
FPGA design has been fully tested as well as the telemetry design.
The flight board is out for assembly and the completed board should
be in house by early April. Fabrication of the GCI flight PCB has
started at SEAKR, an outside vendor, with most work complete on
SOLSTICE. SIM and TIM boards have just begun.
PCI I/O hardware
integration is complete in the PCI target, SRAM and EEPROM, GCI
command and GCI telemetry. A/D converter build is underway. GCI
software driver and 1553 software driver and sequencing engine are
complete. The XPS control task in complete, the TIM control task
begun. Additional staff has been added for the SOLSTICE and SIM
control tasks. Two additional CTSIMS should arrive any day and they
will increase testing capabilities.
SORCE staff will visit the Chandler, Arizona Pegasus rocket facility
April 4-5. Particular interest will be focused on payload models,
fit check, and stage 3 camera mountings and camera operation. A
new southerly launch trajectory has been chosen for SORCE. The casualty
expectation is considered almost nil and ground asset availability
requirements have been met with the incorporation of a U.S. Navy
ground station in Overberg, South Africa. All SORCE mass models
have been delivered to Orbital. Integration and test preparations
include the delivery and fabrication of mechanical and electrical
ground support equipment such as: Flotron stand, delivery of cradle
materials, frame for rack mount equipment, finished cable designs,
uninterruptable power supply and meters. Preliminary FMEA's (failure
modes and effects analysis) have been delivered for SOLSTICE, SIM,
TIM, MU and XPS. FMEA reviews and redlines are in process. Power,
mass, memory and bandwidth margins continue to be in good shape.
Orbital completed the instrument bench doubler repair analysis and
briefed GSFC, but since the bench must be entirely rebuilt due to
substandard composite material present in the original bench, the
study will only be utilized for future trouble shooting. The SORCE
"gyroless" study is complete and a stop work order for
FOG (fiber optic gyro) production is in process. The Solar Cell
CDR (critical design review) was completed with Spectrolab, and
there are no outstanding issues resulting from the review. Flight
cards for the PRE (power system) have been received and 25 more
are expected before the end of March. Additional test equipment
dedicated to the SORCE project was delivered to Orbital and some
work has been outsourced to improve the schedule. Overtime has also
been scheduled. The late delivery of the Alenia transceiver has
caused workarounds, and Alenia management will be visiting Orbital
April 4, and the issue will be addressed, again. FSS (fine sun sensor)
light cell board assembly is complete and awaiting engineering model
shock test. APE EDU late delivery due to a lingering FPGA problem
has been addressed with the addition of extra design staff.
Each month SNS will present mission progress, highlights, and news.
If you have any information to distribute to the SORCE Team, contact
Kathy.Lozier@lasp.colorado.edu, and we will include it in the next
month's issue of SNS.