Subject: SDO Weekly Report for January 7, 2005 From: Elizabeth Citrin Date: Thu, 06 Jan 2005 17:35:44 -0500 To: "SDO WEEKLY DISTRIBUTION":; SDO Weekly Report for January 7, 2005 Executive Summary: SDO received a large portion of its FY05 funding requirements this week and the Project is putting these funds to good use. The Project participated in a telecon with KSC and Lockheed-Martin to discuss the impact of raising the injection perigee for SDO. This change is important because it would allow an increase in SDO’s propellant margin--the Project has a concern about the adequacy of propellant margin in some anomaly situations. The bottom line is that raising the perigee from the 300 km baseline to 2500 km has a negligible impact on the launch vehicle's performance margin (55 kg). This is because at the lower perigee there is a significant mass penalty (681kg) in order to meet orbital debris guidelines. The lower perigee also requires LV modifications to support the guided Centaur de-orbit burn--a first for the Atlas, and a significant cost impact. The Project will be working with Headquarters in the coming weeks to baseline a perigee of at least 2500 km (which supports passive disposal) in order to lower SDO risk, lower LV costs and obtain an orbital debris compliant orbit...all with minimal impact to the mass available for a secondary. Detailed Reports: The CM team continues their support of the transition to the new MIS while maintaining the more than full-time level of SDO’s regular CM business. Transition support includes certification of correct data transfer and manual correction in the database, providing daily feedback to the programmers while correcting "bugs", and introducing SDO team members to the new system, as required. The SDO Systems Engineering team held their Subsystem CDR immediately prior to the Christmas Holiday, reviewing the SDO systems engineering approach and progress up to this point in the program, as well as plans for the remaining phases of the SDO mission. This review was intended as an opportunity for an independent team to consider the SDO design implementation from a systems perspective and assess whether the design is sufficiently mature to move into end-item production, as well as to provide an independent evaluation of the adequacy of the Systems Engineering processes in place to support the build, test, and verification of the final SDO system. The review team was pleased with the SDO Systems Team progress and is in the process of preparing its final review team report. Systems engineers from two of the three SDO instruments traveled to GSFC to participate in the SDO Systems review In addition, the Systems team has been holding technical and interface discussion on a number of development and implementation areas. As noted above, work is ongoing in preparing a CCR to NASA HQ SDO Level 1 Requirements regarding a higher injection perigee. The systems team has also been working towards initial High Speed Science Data bus Interface testing, holding internal and external technical interchange meetings in preparation for a series of upcoming interface tests this year. Spacecraft procurement activities continue to progress. The RF Rotary Joint procurement was awarded to Kevlin. Evaluation of proposals is on-going for the Ka Band High Gain Antenna, the Propulsion System Fill/Drain valves, Isolation Valves and Check Valves, the ACS Star Tracker and the Digital Sun Sensor. RFOs have been released for the Pyro valves, Pressure Transducers and S-band Transponder. With regard to our in-house avionics and development units, efforts continued. Testing continued using the GCE software diagnostics and with the GCE Gimbal Interface Card and SDN Breadboards. The GIC ETU was in layout. Testing continued on the C&DH Ka Comm Breadboard with the Instrument Simulator. Flight Software installed Operating System software on the BAE SBC Breadboard. Testing of the integrated transmitter breadboards has been progressing well. Successful completion of these tests will allow SDO to drop the Traveling Wave Tube Amplifier (TWTA) as a backup risk mitigation option. An HMI Science Meeting will be held on January 26 and 27, 2005 at Stanford University. The HMI ETU front door is assembled and operating and the filter oven mass model has been installed in the optics package structural model. HMI has started daily stand-up meetings as they move into the integration and test phase of the instrument development program. The electronic brassboards are making significant progress with all but the camera interface board and the power board in or through testing. The flight processor board Start-Up-ROM testing is scheduled to begin shortly. e2v has successfully completed shock testing on the CCDs. The CCD shock test was rerun after the original test discovered an error in the CCD mounting that produced cracks in the ceramic carrier. The AIA Telescope CDR Peer Review is being held at SAO this week. Many team members are attending. The Ground System team is preparing for their CDR Peer Reviews. Detailed discussion on contingency operations and C&DH telemetry flows from the antennas to the three SOCs and the MOC are being documented and folded into the Peer Review presentation packages. The White Sands facility detailed design has been initiated. The dynamics range analysis is also being finalized. -------------------------------- Elizabeth Citrin SDO Project Manager NASA/GSFC 301-286-1222 (office) 410-241-0503 (cell) 301-286-0214 (fax)