Background and justification:

The reception performances of the Deep Space Ground Stations is limited by the noise generated in the front end. Any reduction of this noise will allow to increase the data transmitted or to reduce the required mass and power on the spacecraft transmitter.X band is presently used for the telemetry of all deep space missions and will still be the preferred frequency band for future Mars exploration missions. The existing feed and LNA systems have been designed separately. Therefore, the feed system is operated at room temperature while the LNA is operated at 12 K.

The purpose of this study was to define the a communication subsystem architecture (including both ground and space segments, as well as operational methods) that allows robust RF TT&C links during superior solar conjunction phases. The defined architecture shall ensure robust and reliable links in scintillation regimes (i.e. at low SEP angles) where TT&C links are nowadays degraded, leading to occasional link interruptions. Similarly, the defined architecture shall ensure that at even higher scintillation regimes (i.e.

Background and justification: The

The demise of space debris (e.g. upper stages, satellites, their components) re-entering the atmosphere results in emissions into the atmosphere. Typically, most of the re-entering object mass does not survive the atmospheric transit and ends up being released into the atmosphere under gaseous or particulate forms. Depending on the nature and material composition of reentry debris, a wide range of re-entry gases and particles are released. Some are chemically active, in particular ozone destroying, or/and radiatively active (i.e. climate forcers).

Syer et al. published a paper titled “Leveraging Performance Counters and Execution Logs to Diagnose Memory-Related Performance Issues” in the International Conference on Software Maintenance in 2013. In that paper, the authors describe an automated approach that combines execution logs and performance counters (e.g. memory heap usage) in order to assist performance analysts in diagnosing memory-related performance issues (e.g. memory leaks) that appear in load tests.

Typically the human computer interface used on current operational systems consists of a three headed workstation with a keyboard and mouse. During mission critical phases the flight control team and associated support personnel (who are typically distributed throughout different rooms) wear headsets and communicate over voice loops. In the event that an issue arises that requires discussion a meeting is called. This entails that the meeting participants need to leave their workstations to attend the meeting.