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- 2380ecc6-b5ae-4ad8-a56a-9740166465aa definition "the star tracker calculates a coarse attitude by matching triangle patterns of stars with patterns stored in its catalog. Subsequently, in attitude update mode it calculates precise attitude at a rate of 1.7 Hz. The star tracker attitude serves also as reference for determining the orientation of the SIRAL interferometric baseline. The orientation of the interferometric baseline needs to be very accurately measured in-flight: small errors in knowledge of the roll-angle translate into substantial errors in the elevation of off-nadir points. The HE-5AS star tracker of Terma A/S, originally developed and qualified for the NEMO (Navy EarthMap Observer) and FCT (Foreign Comparative Test) projects, is selected for CryoSat. It is a fully autonomous star tracker capable of delivering high-accuracy inertial attitude measurements from a lost-in-space condition with no external attitude information. The EOL performance of the star tracker is < 3.2 arcsec in the lateral axes and < 16 arcsec about the roll axis under worst-case conditions. 13) The star tracker baffle has been designed to meet the required sun exclusion angle of 30º and the moon exclusion angle of 25º. These exclusion angles ensure together with the star tracker accommodation on the antenna bench that during the whole mission sun and moon can only blind one star tracker head at any time." @default.
- 2380ecc6-b5ae-4ad8-a56a-9740166465aa id "1654373" @default.
- 2380ecc6-b5ae-4ad8-a56a-9740166465aa path_id 6015ef7b-f3bd-49e1-9193-cc23db566b69 @default.
- 2380ecc6-b5ae-4ad8-a56a-9740166465aa path_id 92ddaaca-40b2-4936-bc1a-28cc5743e8b8 @default.
- 2380ecc6-b5ae-4ad8-a56a-9740166465aa path_id abe7fa55-1198-44ea-8327-20d13155b46c @default.
- 2380ecc6-b5ae-4ad8-a56a-9740166465aa path_id b2140059-b3ca-415c-b0a7-3e142783ffe8 @default.
- 2380ecc6-b5ae-4ad8-a56a-9740166465aa path_id c8fe757b-b530-4d67-a553-e4903f4430a5 @default.
- 2380ecc6-b5ae-4ad8-a56a-9740166465aa path_label "Active Remote Sensing" @default.
- 2380ecc6-b5ae-4ad8-a56a-9740166465aa path_label "Altimeters" @default.
- 2380ecc6-b5ae-4ad8-a56a-9740166465aa path_label "Earth Remote Sensing Instruments" @default.
- 2380ecc6-b5ae-4ad8-a56a-9740166465aa path_label "Instruments" @default.
- 2380ecc6-b5ae-4ad8-a56a-9740166465aa path_label "Radar Altimeters" @default.
- 2380ecc6-b5ae-4ad8-a56a-9740166465aa prefLabel "Star Tracker" @default.
- 2380ecc6-b5ae-4ad8-a56a-9740166465aa reference "https://directory.eoportal.org/web/eoportal/satellite-missions/c-missions/cryosat-2" @default.
- 2380ecc6-b5ae-4ad8-a56a-9740166465aa tag "Instruments" @default.