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  • Soundblasting a satellite – time-lapse of testing
    on September 16, 2021 at 12:50 pm

    Video: 00:03:01 Verifying that a satellite will resist the sheer noise of the rocket launching it into orbit is a very important test that every mission must successfully pass.“Typically satellites are tested inside purpose-built reverberant chambers, such as ESTEC’s own Large European Acoustic Facility sometimes described as the largest and most powerful sound system in Europe,” explains ESA test facility expert Steffen Scharfenberg, overseeing the test campaign together with ESA mechanical engineer Ivan Ngan. A very powerful noise generation system produces a uniform noise field thanks to the reverberation on the thick concrete walls of the chamber.ESA has initiated a working group comprising of European spacecraft testing entities, industries and academics to study an alternative method, in which the satellite is surrounded by less powerful noise generators but these are placed very close all around the satellite. This method is called the Direct Field Acoustic Noise Test.This technique is already in use in several locations but there is not yet much experience of it in Europe. Accordingly ESA has just completed a test campaign where the classic method and the new method have been used on a small satellite to compare their results.Evaluating this new kind of acoustic test for satellites at ESA’s ESTEC Test Centre in the Netherlands, shown via time-lapse.At first glance, the placing of 36 powerful loudspeakers and 18 subwoofers looks like preparations for a big rock concert – except these speakers are all being placed to face each other in a circle instead of outward. The microphones arranged around the satellite measure the surrounding acoustic field during the test run.The test took a day and a half to set up, then a day to dismantle, with the actual acoustic test run itself taking place in a matter of a few minutes for passing the qualification level requirement.The satellite under test is a ‘structural and themal model’ test version of the Proba-V Earth-observing mission, manufactured by QinetiQ Space in Belgium.The working group is now assessing the obtained test data in detail, to confirm suitability of the method and defines when and how this method could be employed.

  • Solar cell system
    on September 16, 2021 at 11:18 am

    Image: Solar cell system

  • ESA Open Day registration now open
    on September 14, 2021 at 11:15 am

    Registration for this year's ESA Open Day is now open. This tenth annual ESA Open Day will combine an in-person visit of ESA's ESTEC technical centre in the Netherlands by people with disabilities (and their carers as needed) on Saturday 2 October and a virtual event for everyone, taking place on the following day, on Sunday 3 October.

  • Cassini’s wake: how might a spacecraft disturb its own measurements?
    on September 10, 2021 at 7:30 am

    Simply by moving through the heavens, spacecraft change the space about them. Such interactions are invisible to the naked eye, but can endanger mission performance and safety. A new ESA Resarch Fellow study simulated the Cassini spacecraft in the vicinity of Saturn, checking the findings against actual space measurements. It reveals Cassini cast an ‘ion wake’ up to 6 m behind it, a void of plasma particles like a trail of a boat.

  • New angle on reflected satnav yields sharper sea tracking
    on September 8, 2021 at 2:48 pm

    An experimental satellite navigation receiver station high atop Spain’s Mallorca island has opened up a novel view of the ever-changing face of the sea. By picking up satnav signals from the far horizon as they bounce off ocean waves, the receivers are able to measure sea surface height down to a scale of centimetres.

Explore the NASA STI Repository (NTRS) on Scientific and Technical Information Program Recent content in Explore the NASA STI Repository (NTRS) on Scientific and Technical Information Program

  • Harvesting Data from the NASA STI Repository (NTRS)
    on March 25, 2021 at 11:46 pm

    Harvesting Data from the NASA STI Repository (NTRS) The NASA Scientific and Technical Information (STI) Program is upgrading the NASA STI Repository (NTRS) launch to enhance discoverability of, and access to, NASA funded STI. The STI Repository promotes the dissemination of NASA STI to the widest audience possible by allowing information to be harvested. In support of these objectives, the upgraded repository has an OpenAPI to provide greater access to publicly available data and further flexibility for dissemination of NASA research results.

  • For Developers
    on March 25, 2021 at 11:33 pm

    For Developers NASA API’s launch makes NASA data, including imagery, eminently accessible to application developers. The NASA STI Repository OpenAPI is the recommended mechanism for access to NASA’s public collection of STI, and is available along with API documentation and guidance. What is STI? STI (scientific and technical information) is defined as a paper, abstract, journal article, presentation, etc. that contains and delivers the results (the analyses of the data, facts, and resulting conclusions) of basic and applied scientific, technical and related engineering research and development.

  • NASA Programs and Directorates
    on March 25, 2021 at 3:58 am

    NASA Programs and Directorates Directorates Aeronautics Research Mission Directorate launch Human Exploration and Operations Mission Directorate (HEOMD) launch Commercial Space Transportation launch Exploration Systems Development Ground Systems Development launch Orion Spacecraft launch Space Launch System launch Operations International Space Station launch Launch Services launch Space Communications and Navigation (SCaN) launch Research and Technology Advanced Exploration Systems launch Human Research Program launch Space Life and Physical Sciences Research and Applications launch Space Shuttle Space Shuttle Historical Pages launch Space Shuttle Retirement launch Science Mission Directorate (SMD) launch Astrophysics Division launch Earth Sciences Division launch Heliophysics Division launch Planetary Sciences launch Solar System Exploration launch Space Technology Mission Directorate (STMD) launch Programs NASA Education Program launch

  • The NASA STI Program
    on March 23, 2021 at 5:48 pm

    The NASA STI Program The NASA Scientific and Technical Information (STI) Program is a critical component in the worldwide activity of scientific and technical aerospace research and development. The NASA STI Program acquires, processes, archives, announces, and disseminates NASA STI and acquires worldwide STI of critical importance to NASA and the Nation. Collected from U.S. and international sources, STI is organized according to content prior to being added to the NASA STI Repository (NTRS) launch .

  • Submit to PubSpace
    on March 22, 2021 at 5:02 am

    Submit to PubSpace Who is Required to Participate? | Submission Guides & Resources | Browse & Search PubSpace | Additional Help Who is Required to Participate All NASA-funded authors and co-authors (both civil servant and non-civil servant) are required to deposit copies of peer-reviewed scientific publications and associated data into NASA’s publication repository called PubSpace launch . Note: The PubSpace collection EXCLUDES patents, publications that contain material governed by personal privacy, export control, proprietary restrictions, or national security law or regulations.