1 / 13

Scientific mission : feasibility, scenarios

Scientific mission : feasibility, scenarios. Scientific proposals. Following the call for proposal of 2006 by our PIs, about 80 scientists have submitted a request Today : 148 requests from the scientific community Some considerations : Reminder :

sun
Download Presentation

Scientific mission : feasibility, scenarios

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Scientific mission : feasibility, scenarios

  2. Scientific proposals • Following the call for proposal of 2006 by our PIs, about 80 scientists have submitted a request • Today : 148 requests from the scientific community • Some considerations : • Reminder : • An “image” corresponds to a piece on earth of 27 kms * 27 kms • a site is a piece on earth, of at least one image, with, when any, a required scan angle. Those which are longer than 2 images (54 kms long) are called “composite sites” • Some scientists have submitted many sites • For instance : a scientist proposes 26 sites • Some geographic places are requested with different scan angles by the scientist • For instance : TAPAJOS, in South America, is requested at Nadir, forward, and backward -> counts for 3 sites • Some sites are requested by different scientists • For instance : ARCACHON is requested by two different scientists • Composite sites were created to scan close sites • For instance; SLOVENIA 2 and SLOVENIA 3 were gathered in a single composite site : SLOVENIA 23

  3. The request : Number of original request registered since the 2006’s call for proposal : 148 Programming artifacts (composite sites gathering scientists’ requests) : 1 -> number of sites registered in the system : 149 Number of duplications : -12 -> number of sites to be processed : 137 Note : number of geographic places concerned : 126 Actually achieved (17th iteration) Number of scanned sites : 95 (reminder : mission spec : 50 sites, system spec :70 sites) Out of reach : 19 Discarded because cinematic conflict : 21 Discarded because simulator anomaly 2 Total : 137 Statistics

  4. Distribution 3 composite sites -> 26 images

  5. Main constraint applying : satellite agility • Most significant example : rev 17 : too many sites to scan Examples of cinematics conflict resolutions Example of cinematics conflict

  6. Concerns to be worked out • Rev 17 still too loaded wrt to the size of the auxiliary data buffer on board-> no work around possible. A few (4 or 5) sites will have to be discarded • Poor S-band coverage to upload the telecommands (2 passes (+2 as back up) per week). Work around to discuss : number of passes to be increased • Note : if the orbit is 666 kms high (3 day repetitivity) : many more (25%) scans possible. Only one site scanned at 720 km (2 day repetitivity) cannot be scanned at 666 kms. • final selection of the sites : end of 2010 (launch – 18 months). Pre-requisite : • Orbit choice (depends on the launcher) • Real constraints applying on the use of the system given by MBT (see here-over)

  7. Additional slides

  8. System spec System design Constraints Captured in user manual(s) and/or MOCD Also sprach Zarathustra :« use the system as designed, not as specified » • Essential : the system will be used as designed, not as specified, according to the actual constraints captured in the MOCD : • Constraints identified today : • Satellite agility • Max duration per orbit in camera « hot » modes • Max ON/OFF number of the focal plane electronics • OBR size • Auxiliary buffer size • Command file size • Command upload max duration • Max tilt (for image quality purpose) • Power balance • Thermal balance • Caution : this rationale leads to have more images per orbit and per cycle than originately specified in the System Requirement Document.

  9. The regular ASD in VM1 : findings • Departing point : the SiteDefinitionSet file • Inhibition of non "S" sites • Inhibition of Tsukuba and Uzbekistan to work around anomaly # 42 on VESTALE • 3 kinematic conflicts found : • On rev 2 (Central Europe). Kinematic conflict solved by discarding : Gilching Free scan angle, Gilching at +10°, Gilching at -10°, Bily Kriz at +10°, Bily Kriz at -10°, San Rossore at +10°, San Rossore at -10° • On rev 7 (South-West USA). Conflict solved by discarding : STSfree, Gray Ranch • On rev 17 (Western Europe). Conflict solved by discarding : Geldersse at +10°, Geldersee at -10°, Hasselt, Brabant, Hesse, Grand Morin, Laegern, Dombes, Castella, Arcachon, Sauterne, Le Bray • On rev 19 (South America). Conflict solved by discarding : Tapajos at free scan angle • ASD REGULAR for VM1 : VE_VM01_MPL_ASDEFN_R_REGULAR_NMNL_0017.EEF

  10. Compliance with the constraints

  11. Present scientific profile versus original specification

  12. The regular ASD in VM3 : findings • Departing point : the SiteDefinitionSet file • Inhibition of the sites accessed from revs : 4, 8, 12, 16, 20, 24, 28, 31, as thse revs are used or orbit maintenance by the electric thrusters IHET • 2 conflicts found : • On rev 2 (Central Europe). Conflict solved by inhibition of : Bugac • On rev 18 (Western Europe). Conflict solved by inhibition of : Hesse, Laegern, Dombes, Grand Morin, Brabant, Hasselt, Valdala, Camargue

  13. VM3 orbitzoom on Europe Rev 18 Rev 2

More Related