been officially signed off. The SORCE-ESDIS Interface Control
Document draft has been submitted, and a final version will be
submitted in the coming months. Earth science data type and data
product short names have been submitted to DAAC for review and
Level 4 (modeled 1nm irradiances) data product will be added to
the interface control document for delivery to DAAC.
SORCE OASIS PS (operations and science instruments support planning
and scheduling) is still ahead of schedule. A functional SORCE
OASIS PS application exists and is capable of generating partial
science plans. Generic planning capabilities are complete and
tested as well as design and requirement of expert schedulers
and constraint checkers. The Operations Concept Document is maturing
in parallel with OASIS-PS development activities.
Mission Operations are moving into high gear. An updated RF ICD
has been received from GSFC and more comments are due 2/14/01.
An initial draft of the PSLA has been received and the next draft
release is 2/15/01. OASIS-CC development continues and is ready
and for initial MU command testing. The computer security plan
documents were sent to Goddard review the first week of February
and evaluation meetings are scheduled at GSFC for the week of
February 21, 2001. The first set of C and T Database Transfer
files has been received from Orbital and ingested into the SORCE
The SSI (standard serialized interface) command for the FPGA (field
programmable gate array) has been partially completed and delivered
for software test. The final design should be released to software
testing by February 23, 2001. The SSI telemetry FPGA design is
in process and should be delivered to software test by March 16,
2001. The MU power distribution board engineering model has been
delayed but work is progressing and full integration into the
engineering model is expected by the end of February 2001. The
flight unit parts are in house and flight testing should be complete
by March 15, 2001. The GCI (generic channel interface) engineering
model boards are complete and tested. Flight board fabrication
Flight Software PCIIO hardware integration is underway, 1553 communications
are on flight hardware, and the instrument commands and telemetry
will follow. The GCI software
complete and ready for test. The inflight patch mechanism design
is on the SORCE website for review. The implementation of command/telemetry
items has begun.
Signal Processor Status
The DSP (digital signal processor) SOLSTICE grating drive control
is fully functional. The PID (proportional integral derivative)
is being fined tuned for operational agility and robustness. The
DSP (digital signal processor) code has been fully tested. The
interface between the FPD (Fery prism drive) and the DSP board
is working on SIM.
Spacecraft system progress is good. The MICD, (mechanical interface
control document), required for fairing fabrication, has been
signed. Payload handling, site facilities and processes, and hydrocarbon
monitoring at storage and hot pad facilities have been reviewed.
An integrated thermal model of the spacecraft bus and the SORCE
instruments is in process, as well as the operational constraint
analysis. The routing and stuffing of the SORCE instrument module
harness is underway at Orbital and LASP. Power, mass, bandwidth
and memory budgets have adequate margins.
Developments from Orbital on the spacecraft bus follow. The CEU
EDU (Central Electronics Unit Engineering Development Unit) was
delivered to flatsat and test is being repeated on the CEU EDU.
This test had been previously run on GALEX hardware. The battery
CPV's have been bought off and the APE EDU (attitude power electronics
engineering development unit) has completed test. The bus harness
mockup is complete and the preliminary CDR transceiver material
was reviewed Feb. 7, 8, 2001. Avionics production delays are starting
to require work-arounds in order to meet schedule. The EDU fine
sun sensor head failed shock test. A redesign is in work. A GALEX
(Galaxy Evolution Explorer) battery is not available to SORCE
and other options are being researched. PRE (power regulator electronics)
evaluation is still ongoing per NASA request.
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.