Status Report

Cassini Significant Events for 05/29/03 – 06/04/03

By SpaceRef Editor
June 6, 2003
Filed under , ,
Cassini Significant Events for 05/29/03 – 06/04/03

The most recent spacecraft telemetry was acquired from the Goldstone
tracking station on Monday, June 2. The Cassini spacecraft is in an
excellent state of health and is operating normally. Information on the
present position and speed of the Cassini spacecraft may be found on
the "Present Position" web page located at .

On-board activities this week included Radio and Plasma Wave Science
High Frequency Receiver calibrations, powering on of the Radio Science
Subsystem Ka-band Exciter and Ka-band Traveling Wave Tube Amplifier, and
uplink of files to load the Composite InfraRed Spectrometer Instrument
Expanded Blocks (IEB) to the Solid State Recorders (SSR). Uplink of the
file was successful to the prime string, but failed on the on-line
string. Currently the prime SSR, SSR-B, contains the proper IEBs and the
on-line doesn’t. Investigations continue as to why this happened by
uploading a group of memory readout commands to obtain information from
the CDS sequencing region and statistics.

A preliminary sequence Sequence Change Request (SCR) approval meeting
was held as part of the development process for C38. It has been
determined that final uplink products will not be necessary. C38 will
be uplinked Wednesday June 11th.

The second and final input port for the C39 Science Planning Team (SPT)
process occurred this week. The products were merged and delivered to
ACS for the end-to-end pointing validation process. The C39 SPT process
will be completed on June 13, 2003.

System Engineering (SE) hosted the first Science and Sequence Update
Process (SSUP) Verification and Validation (V&V) status meeting. Items
reviewed from this past week’s activities include SSUP kick-off,
stripped subsequence delivery with a focus on who is using the files,
how, and does it meet their needs, SCR guidelines/uplink forms system,
and the sequence phase list of ancillary files. In addition, SE
delivered to V&V the new configuration file management process for use
during the SSUP VNV, and the deadline has passed for submission of SCRs
for S14 V&V.

The Navigation Team completed the processing of the optical navigation
images which were taken during the flight software checkout in C36. The
final result was an orbit solution which incorporated both radiometric
and optical data. This has validated the end to end processing of
optical navigation data from spacecraft execution through to orbit
solution. Another test is planned for the C39 sequence, which will use
the final release of the multimission image processing software.

Delivery coordination meetings were held this week for the ALF tool
version 9, and the command database version 9F. This version will be
available with Mission Sequence Subsystem D9.1 to be delivered in July

Uplink Operations has begun the process of defining the contents of
Cassini Information Management System (CIMS) 3.0. While several areas of
functionality were already identified, the detailed requirements are now
being negotiated with users. The Sequence Team leads have begun
training in the use of CIMS.

The Imaging Science Subsystem telemetry processor used for making Level
1A products has been updated to handle the circumstance where very poor
on-board data compression could lead the ground program to crash.

Cassini is a cooperative project of NASA, the European Space Agency and
the Italian Space Agency. The Jet Propulsion Laboratory, a division of
the California Institute of Technology in Pasadena, Calif., manages the
Cassini mission for NASA’s Office of Space Science, Washington, D.C.

SpaceRef staff editor.